import contextlib
import io
import json
import os
import stat
import struct
import subprocess
import sys
import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch

sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
import import_audit
import nid_names

GLOBAL_FUNCTION = 0x12
LOCAL_FUNCTION = 0x02
STUB_SOURCE = "int APS5_VABI {name}(int value) {{ NotImplemented_nid_no_patch(__func__); return 0; }}\n"
DONE_SOURCE = "int APS5_VABI {name}(int value) {{ return value; }}\n"
MESSAGE_NID = "wTpfglkmv34"
MESSAGE_NAME = "sceMsgDialogProgressBarSetValue"


def build_elf(symbols, needed=()):
    strings = b"\0"
    entries = [struct.pack("<IBBHQQ", 0, 0, 0, 0, 0, 0)]
    for name, index, info in symbols:
        entries.append(struct.pack("<IBBHQQ", len(strings), info, 0, index, 0, 0))
        strings += name.encode() + b"\0"
    libraries = []
    for library in needed:
        libraries.append(len(strings))
        strings += library.encode() + b"\0"
    table = b"".join(entries)
    table_offset = 64 + len(strings)
    table_offset += -table_offset % 8
    dynamic_offset = table_offset + len(table)
    dynamic_offset += -dynamic_offset % 8
    pairs = [(1, offset) for offset in libraries]
    if pairs:
        pairs.append((0, 0))
    dynamic = b"".join(struct.pack("<qQ", tag, value) for tag, value in pairs)
    sections_offset = dynamic_offset + len(dynamic)
    sections_offset += -sections_offset % 8
    image = bytearray(sections_offset + (4 if dynamic else 3) * 64)
    image[64:64 + len(strings)] = strings
    image[table_offset:table_offset + len(table)] = table
    if dynamic:
        image[dynamic_offset:dynamic_offset + len(dynamic)] = dynamic
        image[sections_offset + 192:sections_offset + 256] = struct.pack("<IIQQQQIIQQ", 0, 6, 2, 0, dynamic_offset, len(dynamic), 2, 0, 8, 16)
    image[sections_offset + 64:sections_offset + 128] = struct.pack("<IIQQQQIIQQ", 0, 11, 2, 0, table_offset, len(table), 2, 1, 8, 24)
    image[sections_offset + 128:sections_offset + 192] = struct.pack("<IIQQQQIIQQ", 0, 3, 2, 0, 64, len(strings), 0, 0, 1, 0)
    image[:64] = struct.pack("<16sHHIQQQIHHHHHH", b"\x7fELF\x02\x01\x01" + bytes(9), 3, 0x3e, 1, 0, 0, sections_offset, 0, 64, 0, 0, 64, 4 if dynamic else 3, 0)
    return bytes(image)


def build_sectionless_elf(symbols, needed=(), gnu_hash=False):
    strings = b"\0"
    entries = [struct.pack("<IBBHQQ", 0, 0, 0, 0, 0, 0)]
    for name, index, info in symbols:
        entries.append(struct.pack("<IBBHQQ", len(strings), info, 0, index, 0, 0))
        strings += name.encode() + b"\0"
    libraries = []
    for library in needed:
        libraries.append(len(strings))
        strings += library.encode() + b"\0"
    program_offset = 64
    content_offset = program_offset + 2 * 56
    strings_offset = content_offset
    symbols_offset = (strings_offset + len(strings) + 7) & ~7
    symbol_table = b"".join(entries)
    hash_offset = (symbols_offset + len(symbol_table) + 3) & ~3
    if gnu_hash:
        hash_table = struct.pack("<IIII", 1, 1, 1, 0) + bytes(8)
        hash_table += struct.pack("<I", 1) + b"".join(struct.pack("<I", 1 if index == len(entries) - 1 else 0) for index in range(1, len(entries)))
        hash_tag = 0x6ffffef5
    else:
        hash_table = struct.pack("<II", 1, len(entries)) + struct.pack("<I", 0) + bytes(4 * len(entries))
        hash_tag = 4
    dynamic_offset = (hash_offset + len(hash_table) + 7) & ~7
    dynamic = b"".join(struct.pack("<qQ", 1, value) for value in libraries)
    dynamic += b"".join(struct.pack("<qQ", tag, value) for tag, value in (
        (5, 0x400000 + strings_offset),
        (10, len(strings)),
        (6, 0x400000 + symbols_offset),
        (11, 24),
        (hash_tag, 0x400000 + hash_offset),
        (0, 0),
    ))
    image = bytearray(dynamic_offset + len(dynamic))
    image[strings_offset:strings_offset + len(strings)] = strings
    image[symbols_offset:symbols_offset + len(symbol_table)] = symbol_table
    image[hash_offset:hash_offset + len(hash_table)] = hash_table
    image[dynamic_offset:dynamic_offset + len(dynamic)] = dynamic
    image[program_offset:program_offset + 56] = struct.pack("<IIQQQQQQ", 1, 7, 0, 0x400000, 0x400000, len(image), len(image), 0x1000)
    image[program_offset + 56:program_offset + 112] = struct.pack("<IIQQQQQQ", 2, 6, dynamic_offset, 0x400000 + dynamic_offset, 0x400000 + dynamic_offset, len(dynamic), len(dynamic), 8)
    image[:64] = struct.pack("<16sHHIQQQIHHHHHH", b"\x7fELF\x02\x01\x01" + bytes(9), 3, 0x3e, 1, 0, program_offset, 0, 0, 64, 56, 2, 64, 0, 0)
    return bytes(image)


def exporting(*names):
    return build_elf([(name, 1, GLOBAL_FUNCTION) for name in names])


def with_elf_symbol_table_range(image, offset, size):
    image = bytearray(image)
    section_offset = struct.unpack_from("<Q", image, 40)[0] + 64
    struct.pack_into("<QQ", image, section_offset + 24, offset, size)
    return bytes(image)


def build_pe(names):
    section_rva, raw_offset = 0x1000, 0x200
    strings, rvas = b"", []
    start = 40 + 10 * len(names)
    for name in names:
        rvas.append(section_rva + start + len(strings))
        strings += name.encode() + b"\0"
    raw = struct.pack("<IIHHIIIIIII", 0, 0, 0, 0, 0, 1, len(names), len(names), section_rva + 40, section_rva + 40 + 4 * len(names), section_rva + 40 + 8 * len(names))
    raw += b"".join(struct.pack("<I", 0x2000 + 16 * index) for index in range(len(names)))
    raw += b"".join(struct.pack("<I", rva) for rva in rvas)
    raw += b"".join(struct.pack("<H", index) for index in range(len(names))) + strings
    image = bytearray(raw_offset)
    image[0:2] = b"MZ"
    image[0x3c:0x40] = struct.pack("<I", 0x40)
    image[0x40:0x44] = b"PE\0\0"
    image[0x44:0x58] = struct.pack("<HHIIIHH", 0x8664, 2, 0, 0, 0, 240, 0x2022)
    image[0x58:0x5a] = struct.pack("<H", 0x20b)
    image[0x58 + 60:0x58 + 64] = struct.pack("<I", raw_offset)
    image[0x58 + 108:0x58 + 112] = struct.pack("<I", 16)
    image[0x58 + 112:0x58 + 120] = struct.pack("<II", section_rva, len(raw))
    image[0x58 + 240:0x58 + 280] = struct.pack("<8sIIIIIIHHI", b".edata", len(raw), section_rva, len(raw), raw_offset, 0, 0, 0, 0, 0x40000040)
    image[0x58 + 280:0x58 + 320] = struct.pack("<8sIIIIIIHHI", b".text", 16 * max(1, len(names)), 0x2000, 16 * max(1, len(names)), raw_offset + len(raw), 0, 0, 0, 0, 0x60000020)
    return bytes(image) + raw + b"\xc3" * (16 * max(1, len(names)))


def write_source(root, library, text):
    directory = Path(root) / library
    directory.mkdir(parents=True, exist_ok=True)
    (directory / "Export.cpp").write_text(text)


def write_registry(path, entries, encoding="utf-8"):
    records = []
    for entry in entries:
        record = {"nid": entry[0], "library": entry[1], "relocationType": "R_X86_64_GLOB_DAT"}
        if len(entry) > 2:
            record["weak"] = entry[2]
        records.append(record)
    path.write_text(json.dumps(records), encoding=encoding)


class Workspace:
    def __init__(self):
        self._directory = tempfile.TemporaryDirectory()
        self.root = Path(self._directory.name)
        self.libs = self.root / "libs"
        self.modules = self.root / "modules"
        self.source = self.root / "prx"
        for path in (self.libs, self.modules, self.source):
            path.mkdir()

    def close(self):
        self._directory.cleanup()

    def run(self, registry, *extra, registries=()):
        out, err = io.StringIO(), io.StringIO()
        arguments = [str(registry), *map(str, registries), "--libs", str(self.libs), "--modules", str(self.modules), "--source", str(self.source), *extra]
        with contextlib.redirect_stdout(out), contextlib.redirect_stderr(err):
            code = import_audit.main(arguments)
        return code, out.getvalue(), err.getvalue()


class ImportAuditTests(unittest.TestCase):
    def setUp(self):
        self.work = Workspace()
        self.addCleanup(self.work.close)

    def test_failed_json_write_preserves_existing_report_and_leaves_no_partial_report(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        output = work.root / "audit.json"
        previous = b'{"previous": "complete report"}\n'

        def disk_full(path, content, **kwargs):
            with path.open("w", encoding="utf-8") as handle:
                handle.write(content[:24])
            raise OSError(28, "No space left on device", str(path))

        for exists in (True, False):
            with self.subTest(existing_report=exists):
                if exists:
                    output.write_bytes(previous)
                else:
                    output.unlink(missing_ok=True)
                files = set(work.root.iterdir())
                with patch.object(Path, "write_text", disk_full):
                    code, out, err = work.run(registry, "--json", str(output))
                self.assertEqual((code, out), (2, ""))
                self.assertIn("No space left on device", err)
                self.assertEqual(set(work.root.iterdir()), files)
                if exists:
                    self.assertEqual(output.read_bytes(), previous)
                else:
                    self.assertFalse(output.exists())

    def test_failed_json_replacement_preserves_report_and_cleans_staging(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        output = work.root / "audit.json"
        previous = b'{"previous": "complete report"}\n'
        output.write_bytes(previous)
        files = set(work.root.iterdir())
        with patch.object(Path, "replace", side_effect=PermissionError(13, "Permission denied", str(output))):
            code, out, err = work.run(registry, "--json", str(output))
        self.assertEqual((code, out), (2, ""))
        self.assertIn("Permission denied", err)
        self.assertEqual(output.read_bytes(), previous)
        self.assertEqual(set(work.root.iterdir()), files)

    def test_successful_json_write_replaces_complete_report_without_staging_files(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        output = work.root / "audit.json"
        output.write_text("old report", encoding="utf-8")
        files = set(work.root.iterdir())
        code, _, err = work.run(registry, "--json", str(output))
        self.assertEqual((code, err), (0, ""))
        self.assertEqual(json.loads(output.read_text(encoding="utf-8"))["unique_by_class"]["implemented"], 1)
        self.assertEqual(set(work.root.iterdir()), files)

    @unittest.skipUnless(sys.platform == "win32", "Windows read-only replacement behavior")
    def test_read_only_json_report_stays_intact_without_a_read_only_temporary(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        output = work.root / "audit.json"
        previous = b'{"previous": "complete report"}\n'
        output.write_bytes(previous)
        files = set(work.root.iterdir())
        output.chmod(0o444)
        try:
            code, out, err = work.run(registry, "--json", str(output))
            self.assertEqual((code, out), (2, ""))
            self.assertIn("FAIL:", err)
            self.assertEqual(output.read_bytes(), previous)
            self.assertEqual(set(work.root.iterdir()), files)
        finally:
            output.chmod(0o666)

    def test_json_report_symlink_keeps_its_target(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        target = work.root / "actual-report.json"
        target.write_text("old report", encoding="utf-8")
        output = work.root / "audit.json"
        try:
            output.symlink_to(target.name)
        except (OSError, NotImplementedError) as error:
            self.skipTest(str(error))
        files = set(work.root.iterdir())
        code, _, err = work.run(registry, "--json", str(output))
        self.assertEqual((code, err), (0, ""))
        self.assertTrue(output.is_symlink())
        self.assertEqual(json.loads(target.read_text(encoding="utf-8"))["unique_imports"], 1)
        self.assertEqual(set(work.root.iterdir()), files)

    def test_json_directory_error_preserves_the_supplied_path(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        output = work.modules / ".." / work.modules.name
        self.assertNotEqual(str(output), str(output.resolve()))
        files = set(work.root.iterdir())
        code, out, err = work.run(registry, "--json", str(output))
        self.assertEqual((code, out), (2, ""))
        self.assertEqual(err, f"FAIL: {output}: JSON output is a directory\n")
        self.assertEqual(set(work.root.iterdir()), files)

    @unittest.skipUnless(os.name == "posix", "POSIX report permissions")
    def test_new_json_report_permissions_follow_the_process_umask(self):
        script = "\n".join([
            "import os, sys",
            "from pathlib import Path",
            "sys.path.insert(0, sys.argv[1])",
            "import import_audit",
            "os.umask(int(sys.argv[4], 8))",
            "Path(sys.argv[3]).write_text('{}\\n', encoding='utf-8')",
            "import_audit.write_json(Path(sys.argv[2]), {'complete': True})",
        ])
        for mask, mode in ((0o022, 0o644), (0o002, 0o664), (0o077, 0o600)):
            with self.subTest(umask=oct(mask)):
                output = self.work.root / f"audit-{mask:o}.json"
                reference = self.work.root / f"plain-{mask:o}.json"
                files = set(self.work.root.iterdir())
                completed = subprocess.run([sys.executable, "-c", script, str(import_audit.ROOT / "tools"), str(output), str(reference), oct(mask)], capture_output=True, text=True)
                self.assertEqual(completed.returncode, 0, completed.stderr)
                self.assertEqual(stat.S_IMODE(output.stat().st_mode), mode)
                self.assertEqual(stat.S_IMODE(output.stat().st_mode), stat.S_IMODE(reference.stat().st_mode))
                self.assertEqual(json.loads(output.read_text(encoding="utf-8")), {"complete": True})
                self.assertEqual(set(self.work.root.iterdir()), files | {output, reference})

    @unittest.skipUnless(os.name == "posix", "POSIX report permissions")
    def test_existing_json_report_permissions_are_preserved(self):
        output = self.work.root / "audit.json"
        for mode in (0o600, 0o640, 0o664):
            with self.subTest(mode=oct(mode)):
                output.write_text("old report", encoding="utf-8")
                output.chmod(mode)
                files = set(self.work.root.iterdir())
                import_audit.write_json(output, {"complete": True})
                self.assertEqual(stat.S_IMODE(output.stat().st_mode), mode)
                self.assertEqual(json.loads(output.read_text(encoding="utf-8")), {"complete": True})
                self.assertEqual(set(self.work.root.iterdir()), files)

    def test_classification_accounts_for_every_reference(self):
        work = self.work
        (work.libs / "libSceMsgDialog.prx").write_bytes(build_elf([
            (MESSAGE_NID, 1, GLOBAL_FUNCTION), ("AAAAAAAAAAA", 1, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 1, GLOBAL_FUNCTION),
            ("UNDEFINED11", 0, GLOBAL_FUNCTION), ("LOCALLOCAL1", 1, LOCAL_FUNCTION)]))
        (work.libs / "libc.prx").write_bytes(exporting("CCCCCCCCCCC"))
        (work.modules / "libSceNpCppWebApi.prx").write_bytes(exporting())
        write_source(work.source, "libSceMsgDialog", STUB_SOURCE.format(name=MESSAGE_NAME) + 'APS5_EXPORT("BBBBBBBBBBB", sceFooUnknown_B);\n' + STUB_SOURCE.format(name="sceFooUnknown_B"))
        registry = work.root / "game.registry.json"
        write_registry(registry, [
            (MESSAGE_NID + "#A#B", "libSceMsgDialog.prx"), (MESSAGE_NID, "libSceMsgDialog.prx"),
            ("AAAAAAAAAAA", "libSceMsgDialog.prx"), ("BBBBBBBBBBB", "libSceMsgDialog.prx"),
            ("DDDDDDDDDDD", "libSceMsgDialog.prx"), ("EEEEEEEEEEE", "libSceNpCppWebApi.prx"),
            ("CCCCCCCCCCC", "libSceFoo.prx"), ("AAAAAAAAAAA", "libSceOther.prx"),
            ("UNDEFINED11", "libSceMsgDialog.prx"), ("LOCALLOCAL1", "libSceMsgDialog.prx")])
        result = work.root / "audit.json"
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (1, ""))
        data = json.loads(result.read_text())
        self.assertEqual(data["references"], 10)
        self.assertEqual(data["unique_imports"], 9)
        self.assertEqual(data["unique_by_class"], {"implemented": 3, "stub": 2, "absent": 3, "module": 1})
        self.assertEqual(data["references_by_class"], {"implemented": 3, "stub": 3, "absent": 3, "module": 1})
        self.assertEqual(data["missing_libraries"], {"libSceFoo.prx": 1, "libSceOther.prx": 1})
        self.assertEqual(data["library_mismatch"], 1)
        kinds = {(record["nid"], record["library"]): record["class"] for record in data["imports"]}
        self.assertEqual(kinds[(MESSAGE_NID, "libSceMsgDialog.prx")], "stub")
        self.assertEqual(kinds[("BBBBBBBBBBB", "libSceMsgDialog.prx")], "stub")
        self.assertEqual(kinds[("UNDEFINED11", "libSceMsgDialog.prx")], "absent")
        self.assertEqual(kinds[("LOCALLOCAL1", "libSceMsgDialog.prx")], "absent")
        self.assertEqual(kinds[("EEEEEEEEEEE", "libSceNpCppWebApi.prx")], "module")
        self.assertIn(f"{MESSAGE_NID}  {MESSAGE_NAME}", out)
        self.assertIn("DDDDDDDDDDD", out)

    def test_module_imports_are_audited(self):
        work = self.work
        stub = nid_names.compute_nid("sceModuleStub")
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        (work.libs / "libSceB.prx").write_bytes(exporting(stub))
        write_source(work.source, "libSceB", STUB_SOURCE.format(name="sceModuleStub"))
        (work.modules / "sibling.prx").write_bytes(exporting("BBBBBBBBBBB"))
        (work.modules / "main.prx").write_bytes(build_elf([
            ("AAAAAAAAAAA", 0, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 0, GLOBAL_FUNCTION),
            (stub, 0, GLOBAL_FUNCTION), ("EEEEEEEEEEE", 0, GLOBAL_FUNCTION)], ["libSceA.prx", "sibling.prx"]))
        registry = work.root / "game.json"
        write_registry(registry, [])
        result = work.root / "audit.json"
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (1, ""))
        data = json.loads(result.read_text())
        self.assertEqual(data["references"], 4)
        self.assertEqual(data["unique_by_class"], {"implemented": 2, "stub": 1, "absent": 1, "module": 0})
        self.assertEqual(data["missing_libraries"], {})
        records = {(record["nid"], record["module"]): record for record in data["imports"]}
        self.assertEqual(records[("AAAAAAAAAAA", "main.prx")]["class"], "implemented")
        self.assertEqual(records[("AAAAAAAAAAA", "main.prx")]["providers"], ["libSceA.prx"])
        self.assertEqual(records[("BBBBBBBBBBB", "main.prx")]["class"], "implemented")
        self.assertEqual(records[("BBBBBBBBBBB", "main.prx")]["providers"], ["sibling.prx"])
        self.assertEqual(records[(stub, "main.prx")]["class"], "stub")
        self.assertEqual(records[(stub, "main.prx")]["name"], "sceModuleStub")
        self.assertEqual(records[("EEEEEEEEEEE", "main.prx")]["class"], "absent")
        self.assertIn("[library not named]", out)
        self.assertIn("EEEEEEEEEEE  (imported by main.prx)", out)

    def test_module_sidecars_do_not_change_the_audit(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        (work.modules / "provider.prx").write_bytes(exporting("BBBBBBBBBBB"))
        (work.modules / "consumer.prx").write_bytes(build_elf([
            ("AAAAAAAAAAA", 0, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 0, GLOBAL_FUNCTION)],
            ["libSceA.prx", "provider.prx"]))
        registry, result = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [("BBBBBBBBBBB", "provider.prx")])
        code, before_out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (0, ""))
        before = json.loads(result.read_text())
        for name, data in (("README", b"module notes\n"), ("notes.txt", b"EEEEEEEEEEE\n"),
                           ("provider.registry.json", b'[{"nid":"EEEEEEEEEEE","library":"missing.prx"}]'),
                           (".DS_Store", b"\x00\xffmetadata"), ("empty.txt", b"")):
            (work.modules / name).write_bytes(data)
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (0, ""))
        self.assertEqual(out, before_out)
        self.assertEqual(json.loads(result.read_text()), before)
        write_registry(registry, [("EEEEEEEEEEE", "notes.txt")])
        code, _, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (1, ""))
        data = json.loads(result.read_text())
        record = next(record for record in data["imports"] if record["nid"] == "EEEEEEEEEEE")
        self.assertEqual((record["class"], record["providers"]), ("absent", []))
        self.assertEqual(data["missing_libraries"], {"notes.txt": 1})

    def test_elf_modules_are_audited_regardless_of_filename(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        (work.modules / "provider.data").write_bytes(build_elf([
            ("AAAAAAAAAAA", 0, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 1, GLOBAL_FUNCTION)], ["libSceA.prx"]))
        (work.modules / "consumer.prx").write_bytes(build_elf([
            ("BBBBBBBBBBB", 0, GLOBAL_FUNCTION)], ["provider.data"]))
        registry, result = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [("BBBBBBBBBBB", "provider.data")])
        code, _, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (0, ""))
        data = json.loads(result.read_text())
        self.assertEqual(data["references"], 3)
        self.assertEqual(data["unique_by_class"], {"implemented": 2, "stub": 0, "absent": 0, "module": 1})
        self.assertEqual(data["missing_libraries"], {})
        records = {(record["nid"], record.get("module")): record for record in data["imports"]}
        self.assertEqual(records[("AAAAAAAAAAA", "provider.data")]["providers"], ["libSceA.prx"])
        self.assertEqual(records[("BBBBBBBBBBB", "consumer.prx")]["providers"], ["provider.data"])

    def test_bad_named_modules_and_malformed_elf_are_not_ignored(self):
        work = self.work
        (work.libs / "libc.prx").write_bytes(exporting())
        registry, result = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [])
        previous = b'{"previous":"report"}\n'
        invalid_class = bytearray(exporting())
        invalid_class[4] = 1
        candidates = [("guest" + suffix, b"module placeholder\n")
                      for suffix in (".prx", ".sprx", ".suprx", ".debug_prx", ".elf", ".PRX")]
        candidates += [("truncated.data", b"\x7fELF"), ("unsupported.data", invalid_class)]
        for name, image in candidates:
            module = work.modules / name
            module.write_bytes(image)
            for exists in (False, True):
                with self.subTest(name=name, existing_report=exists):
                    if exists:
                        result.write_bytes(previous)
                    else:
                        result.unlink(missing_ok=True)
                    code, out, err = work.run(registry, "--json", str(result))
                    self.assertEqual((code, out), (2, ""))
                    self.assertIn(name, err)
                    self.assertIn("ELF", err)
                    if exists:
                        self.assertEqual(result.read_bytes(), previous)
                    else:
                        self.assertFalse(result.exists())
            module.unlink()

    def test_pe_and_self_modules_are_not_ignored_as_sidecars(self):
        work = self.work
        (work.libs / "libc.prx").write_bytes(exporting())
        registry, result = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [])
        previous = b'{"previous":"report"}\n'
        for image in (build_pe(["alpha"]), b"\x4f\x15\x3d\x1d" + bytes(64),
                      b"\x54\x14\xf5\xee" + bytes(64)):
            for name in ("guest.prx", "metadata.txt"):
                module = work.modules / name
                module.write_bytes(image)
                with self.subTest(name=name, magic=bytes(image[:4])):
                    result.write_bytes(previous)
                    code, out, err = work.run(registry, "--json", str(result))
                    self.assertEqual((code, out), (2, ""))
                    self.assertIn(name, err)
                    self.assertIn("ELF", err)
                    self.assertEqual(result.read_bytes(), previous)
                module.unlink()

    def test_module_needed_library_without_a_file_is_missing(self):
        work = self.work
        (work.libs / "libc.prx").write_bytes(exporting())
        (work.modules / "main.prx").write_bytes(build_elf([], ["libSceMissing.prx"]))
        registry = work.root / "game.json"
        write_registry(registry, [])
        result = work.root / "audit.json"
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (1, ""))
        data = json.loads(result.read_text())
        self.assertEqual((data["references"], data["imports"]), (0, []))
        self.assertEqual(data["missing_libraries"], {"libSceMissing.prx": 1})
        self.assertIn("libSceMissing.prx", out)

    def test_conflicting_module_files_preserve_or_leave_no_json_report(self):
        work = self.work
        first, second = work.modules, work.root / "other-modules"
        second.mkdir()
        (work.libs / "libc.prx").write_bytes(exporting())
        (first / "main.prx").write_bytes(build_elf([
            ("AAAAAAAAAAA", 0, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 1, GLOBAL_FUNCTION)], ["libSceMissing.prx"]))
        registry, result = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [])
        code, _, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (1, ""))
        data = json.loads(result.read_text())
        self.assertEqual(data["unique_by_class"]["absent"], 1)
        self.assertEqual(data["missing_libraries"], {"libSceMissing.prx": 1})
        (second / "main.prx").write_bytes(exporting("CCCCCCCCCCC"))
        previous = b'{"previous": "complete report"}\n'
        for directories in ((first, second), (second, first)):
            for exists in (False, True):
                with self.subTest(directories=directories, existing_report=exists):
                    if exists:
                        result.write_bytes(previous)
                    else:
                        result.unlink(missing_ok=True)
                    with patch.object(work, "modules", directories[0]):
                        code, out, err = work.run(registry, "--modules", str(directories[1]), "--json", str(result))
                    self.assertEqual((code, out), (2, ""))
                    self.assertIn("ambiguous guest module main.prx", err)
                    self.assertIn(str(first / "main.prx"), err)
                    self.assertIn(str(second / "main.prx"), err)
                    if exists:
                        self.assertEqual(result.read_bytes(), previous)
                    else:
                        self.assertFalse(result.exists())

    def test_identical_module_files_are_audited_once(self):
        work = self.work
        first, second = work.modules, work.root / "other-modules"
        second.mkdir()
        (work.libs / "libc.prx").write_bytes(exporting())
        image = build_elf([
            ("AAAAAAAAAAA", 0, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 1, GLOBAL_FUNCTION)], ["libSceMissing.prx"])
        for directory in (first, second):
            (directory / "main.prx").write_bytes(image)
        (first / "consumer.prx").write_bytes(build_elf([("BBBBBBBBBBB", 0, GLOBAL_FUNCTION)]))
        registry, result = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [])
        for directories in ((first, second, first), (second, first, second)):
            with self.subTest(directories=directories), patch.object(work, "modules", directories[0]):
                extra = [argument for directory in directories[1:] for argument in ("--modules", str(directory))]
                code, _, err = work.run(registry, *extra, "--json", str(result))
                self.assertEqual((code, err), (1, ""))
                data = json.loads(result.read_text())
                self.assertEqual((data["references"], data["unique_imports"]), (2, 2))
                self.assertEqual(data["unique_by_class"], {"implemented": 1, "stub": 0, "absent": 1, "module": 0})
                self.assertEqual(data["references_by_class"], data["unique_by_class"])
                self.assertEqual(data["missing_libraries"], {"libSceMissing.prx": 1})
                records = {record["nid"]: record for record in data["imports"]}
                self.assertEqual((records["AAAAAAAAAAA"]["class"], records["AAAAAAAAAAA"]["references"]), ("absent", 1))
                self.assertEqual((records["BBBBBBBBBBB"]["class"], records["BBBBBBBBBBB"]["providers"]), ("implemented", ["main.prx"]))

    def test_module_files_must_be_elf(self):
        work = self.work
        (work.libs / "libc.prx").write_bytes(exporting())
        (work.modules / "guest.prx").write_bytes(build_pe(["alpha"]))
        registry = work.root / "game.json"
        write_registry(registry, [])
        code, out, err = work.run(registry)
        self.assertEqual((code, out), (2, ""))
        self.assertIn("guest.prx", err)
        self.assertIn("ELF", err)

    def test_sectionless_module_imports_and_exports_are_audited(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        (work.modules / "stripped.prx").write_bytes(build_sectionless_elf([
            ("AAAAAAAAAAA", 0, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 1, GLOBAL_FUNCTION)], ["libSceA.prx"]))
        (work.modules / "main.prx").write_bytes(build_elf([("BBBBBBBBBBB", 0, GLOBAL_FUNCTION)], []))
        registry = work.root / "game.json"
        write_registry(registry, [])
        result = work.root / "audit.json"
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (0, ""))
        data = json.loads(result.read_text())
        self.assertEqual(data["references"], 2)
        records = {(record["nid"], record["module"]): record for record in data["imports"]}
        self.assertEqual(records[("AAAAAAAAAAA", "stripped.prx")]["class"], "implemented")
        self.assertEqual(records[("BBBBBBBBBBB", "main.prx")]["class"], "implemented")

    def test_elf_with_out_of_file_section_table_uses_program_headers(self):
        path = Path("module.prx")
        image = build_sectionless_elf([
            ("AAAAAAAAAAA", 0, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 1, GLOBAL_FUNCTION)], ["libSceA.prx"])
        expected_imports = import_audit.elf_imports(path, image)
        expected_exports = import_audit.elf_exports(path, image)
        self.assertEqual(expected_imports, ({"AAAAAAAAAAA"}, {"libSceA.prx"}))
        self.assertEqual(expected_exports, {"BBBBBBBBBBB"})
        for section_offset in (len(image), len(image) + 64):
            for section_count in (1, 0):
                modified = bytearray(image)
                struct.pack_into("<Q", modified, 40, section_offset)
                struct.pack_into("<HH", modified, 58, 64, section_count)
                for reader, expected in ((import_audit.elf_imports, expected_imports), (import_audit.elf_exports, expected_exports)):
                    with self.subTest(section_offset=section_offset, section_count=section_count, reader=reader.__name__):
                        self.assertEqual(reader(path, bytes(modified)), expected)

    def test_module_with_out_of_file_section_table_is_audited(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        module = work.modules / "stripped.prx"
        image = build_sectionless_elf([
            ("AAAAAAAAAAA", 0, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 1, GLOBAL_FUNCTION)], ["libSceA.prx"])
        module.write_bytes(image)
        (work.modules / "main.prx").write_bytes(build_elf([("BBBBBBBBBBB", 0, GLOBAL_FUNCTION)]))
        registry = work.root / "game.json"
        write_registry(registry, [])
        result = work.root / "audit.json"
        code, expected_out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (0, ""))
        expected = json.loads(result.read_text())
        for section_offset in (len(image), len(image) + 64):
            for section_count in (1, 0):
                with self.subTest(section_offset=section_offset, section_count=section_count):
                    modified = bytearray(image)
                    struct.pack_into("<Q", modified, 40, section_offset)
                    struct.pack_into("<HH", modified, 58, 64, section_count)
                    module.write_bytes(modified)
                    code, out, err = work.run(registry, "--json", str(result))
                    self.assertEqual((code, err), (0, ""))
                    self.assertEqual(out, expected_out)
                    self.assertEqual(json.loads(result.read_text()), expected)

    def test_elf_with_truncated_section_table_is_rejected(self):
        work = self.work
        (work.libs / "libc.prx").write_bytes(exporting())
        path = work.modules / "truncated.prx"
        image = build_sectionless_elf([
            ("AAAAAAAAAAA", 0, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 1, GLOBAL_FUNCTION)])
        registry = work.root / "game.json"
        write_registry(registry, [])
        for section_count in (1, 0):
            modified = bytearray(image)
            struct.pack_into("<Q", modified, 40, len(image) - 32)
            struct.pack_into("<HH", modified, 58, 64, section_count)
            for reader in (import_audit.elf_imports, import_audit.elf_exports):
                with self.subTest(section_count=section_count, reader=reader.__name__):
                    with self.assertRaisesRegex(import_audit.AuditError, "lies outside the file"):
                        reader(path, bytes(modified))
            with self.subTest(section_count=section_count, reader="main"):
                path.write_bytes(modified)
                code, out, err = work.run(registry)
                self.assertEqual((code, out), (2, ""))
                self.assertIn(str(path), err)
                self.assertIn("lies outside the file", err)

    def test_sectionless_elf_gnu_hash(self):
        image = build_sectionless_elf([
            ("AAAAAAAAAAA", 0, GLOBAL_FUNCTION), ("BBBBBBBBBBB", 1, GLOBAL_FUNCTION)],
            ["libSceA.prx"], gnu_hash=True)
        self.assertEqual(import_audit.elf_program_dynamic_symbols(Path("module.prx"), image),
                         ({"AAAAAAAAAAA"}, {"BBBBBBBBBBB"}, {"libSceA.prx"}))

    def test_sectionless_hash_metadata_must_be_file_backed(self):
        for gnu_hash in (False, True):
            image = bytearray(build_sectionless_elf([("AAAAAAAAAAA", 1, GLOBAL_FUNCTION)], gnu_hash=gnu_hash))
            load = list(struct.unpack_from("<IIQQQQQQ", image, 64))
            dynamic = list(struct.unpack_from("<IIQQQQQQ", image, 120))
            tags = dict(struct.unpack_from("<qQ", image, position)
                        for position in range(dynamic[2], dynamic[2] + dynamic[5], 16))
            address = tags[0x6ffffef5 if gnu_hash else 4]
            offset = address - load[3] + load[2]
            load[5] = load[6] = offset + (24 if gnu_hash else 8)
            if gnu_hash:
                struct.pack_into("<I", image, offset + 24, 0)
            dynamic[3] += 0x1000
            dynamic[4] = dynamic[3]
            second = [1, 4, dynamic[2], dynamic[3], dynamic[4], dynamic[5], dynamic[5], 1]
            table = len(image)
            for header in (load, second, dynamic):
                image.extend(struct.pack("<IIQQQQQQ", *header))
            struct.pack_into("<Q", image, 32, table)
            struct.pack_into("<H", image, 56, 3)
            for reader in (import_audit.elf_exports, import_audit.elf_imports):
                with self.subTest(gnu_hash=gnu_hash, reader=reader.__name__):
                    with self.assertRaisesRegex(import_audit.AuditError, "hash"):
                        reader(Path("unmapped-hash.prx"), image)

    def test_module_symbol_suffix_is_stripped(self):
        work = self.work
        exported = nid_names.compute_nid("sceRealName")
        (work.libs / "libSceA.prx").write_bytes(exporting(exported))
        (work.modules / "main.prx").write_bytes(build_elf([
            (exported + "#lib#mod", 0, GLOBAL_FUNCTION)], []))
        registry = work.root / "game.json"
        write_registry(registry, [])
        result = work.root / "audit.json"
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (0, ""))
        data = json.loads(result.read_text())
        self.assertEqual(data["unique_by_class"], {"implemented": 1, "stub": 0, "absent": 0, "module": 0})
        self.assertEqual(data["references"], 1)

    def test_module_export_suffix_is_stripped_with_and_without_sections(self):
        work = self.work
        nid = nid_names.compute_nid("sceModuleCall")
        (work.libs / "libSceA.prx").write_bytes(exporting())
        (work.modules / "consumer.prx").write_bytes(build_elf([
            (nid + "#import#module", 0, GLOBAL_FUNCTION)]))
        provider = work.modules / "provider.prx"
        registry, result = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [])
        symbols = [(nid + "#export#module", 1, GLOBAL_FUNCTION)]
        for layout, image in (("sections", build_elf(symbols)),
                              ("sysv", build_sectionless_elf(symbols)),
                              ("gnu", build_sectionless_elf(symbols, gnu_hash=True))):
            with self.subTest(layout=layout):
                provider.write_bytes(image)
                code, out, err = work.run(registry, "--json", str(result))
                self.assertEqual((code, err), (0, ""))
                record, = json.loads(result.read_text())["imports"]
                self.assertEqual((record["nid"], record["class"], record["providers"]),
                                 (nid, "implemented", ["provider.prx"]))
                self.assertEqual(record["module"], "consumer.prx")
        provider.write_bytes(exporting(nid + "other#export#module"))
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (1, ""))
        record, = json.loads(result.read_text())["imports"]
        self.assertEqual((record["nid"], record["class"], record["providers"]), (nid, "absent", []))

    def test_clean_audit_exits_zero_and_empty_registry_is_empty(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "clean.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        self.assertEqual(work.run(registry)[0], 0)
        write_registry(registry, [])
        result = work.root / "empty.json"
        code, out, _ = work.run(registry, "--json", str(result))
        data = json.loads(result.read_text())
        self.assertEqual((code, data["references"], data["unique_imports"], data["imports"]), (0, 0, 0, []))
        self.assertIn("0 references, 0 unique imports", out)

    def test_current_stop_is_the_first_unresolved_import(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx"), ("BBBBBBBBBBB", "libSceA.prx"), ("CCCCCCCCCCC", "libSceA.prx")])
        result = work.root / "audit.json"
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (1, ""))
        data = json.loads(result.read_text())
        self.assertEqual(data["stops"], [{"registry": str(registry), "nid": "BBBBBBBBBBB", "library": "libSceA.prx", "name": None}])
        self.assertIn("Current stop (first unresolved import, in registry order)", out)
        self.assertIn("BBBBBBBBBBB", out)

    def test_current_stop_is_none_when_every_import_resolves(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "clean.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        result = work.root / "audit.json"
        code, out, _ = work.run(registry, "--json", str(result))
        self.assertEqual(code, 0)
        data = json.loads(result.read_text())
        self.assertEqual(data["stops"], [{"registry": str(registry), "nid": None, "library": None, "name": None}])
        self.assertIn(f"  {registry}: none", out)

    def test_a_weak_unresolved_import_is_not_a_stop(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("BBBBBBBBBBB", "libSceA.prx", True), ("CCCCCCCCCCC", "libSceA.prx")])
        result = work.root / "audit.json"
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (1, ""))
        data = json.loads(result.read_text())
        self.assertEqual(data["stops"], [{"registry": str(registry), "nid": "CCCCCCCCCCC", "library": "libSceA.prx", "name": None}])

    def test_removing_an_export_flips_the_class(self):
        work = self.work
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        self.assertEqual(work.run(registry)[0], 0)
        (work.libs / "libSceA.prx").write_bytes(exporting("ZZZZZZZZZZZ"))
        code, out, _ = work.run(registry)
        self.assertEqual(code, 1)
        self.assertIn("AAAAAAAAAAA", out)

    def test_needed_library_without_imports_is_reported(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.registry.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        needed = work.root / "game.needed.json"
        needed.write_text(json.dumps(["libSceA.prx", "Party.prx", "Party.prx"]))
        result = work.root / "audit.json"
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (1, ""))
        data = json.loads(result.read_text())
        self.assertEqual(data["missing_libraries"], {"Party.prx": 0})
        self.assertEqual((data["references"], data["unique_imports"]), (1, 1))
        self.assertIn("Party.prx: 0 imports", out)
        self.assertEqual(data["needed_libraries"], ["Party.prx", "libSceA.prx"])
        (work.modules / "Party.prx").write_bytes(exporting())
        self.assertEqual(work.run(registry)[0], 0)
        (work.modules / "Party.prx").unlink()
        (work.libs / "Party.prx").write_bytes(exporting())
        self.assertEqual(work.run(registry)[0], 0)

    def test_needed_libraries_from_empty_and_module_registries(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting())
        registry = work.root / "game.registry.json"
        module_registry = work.root / "game.engine.prx.guest.prx.registry.json"
        write_registry(registry, [])
        write_registry(module_registry, [])
        (work.root / "game.needed.json").write_text('["Party.prx"]')
        (work.root / "game.engine.prx.guest.prx.needed.json").write_text('["Party.prx", "libSceOther.prx"]')
        result = work.root / "audit.json"
        code, out, err = work.run(registry, "--json", str(result), registries=[module_registry])
        self.assertEqual((code, err), (1, ""))
        data = json.loads(result.read_text())
        self.assertEqual(data["missing_libraries"], {"Party.prx": 0, "libSceOther.prx": 0})
        self.assertEqual((data["references"], data["unique_imports"], data["imports"]), (0, 0, []))
        self.assertIn("0 references, 0 unique imports", out)

    def test_invalid_needed_registry_fails_instead_of_ignoring_it(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting())
        registry = work.root / "game.registry.json"
        write_registry(registry, [])
        needed = work.root / "game.needed.json"
        for text in ('{', '{}', '[42]', '[""]'):
            with self.subTest(text=text):
                needed.write_text(text)
                code, out, err = work.run(registry)
                self.assertEqual((code, out), (2, ""))
                self.assertIn(str(needed), err)

    def test_json_output_cannot_overwrite_needed_registry(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting())
        registry = work.root / "game.registry.json"
        write_registry(registry, [])
        needed = work.root / "game.needed.json"
        needed.write_text('["Party.prx"]')
        alias = work.root / "needed-alias.json"
        os.link(needed, alias)
        for output in (needed, alias):
            with self.subTest(output=output):
                code, out, err = work.run(registry, "--json", str(output))
                self.assertEqual((code, out), (2, ""))
                self.assertIn("overwrite an input", err)
                self.assertEqual(needed.read_text(), '["Party.prx"]')

    def test_source_stubs(self):
        source = self.work.source
        write_source(source, "libSceTwin", STUB_SOURCE.format(name="sceTwinCall") + STUB_SOURCE.format(name="printf_nid_postfix"))
        write_source(source, "libSceTwin.native", DONE_SOURCE.format(name="sceTwinCall"))
        write_source(source, "libSceOnly", STUB_SOURCE.format(name="sceOnlyPending"))
        stubs = import_audit.source_stubs(source)
        twin = nid_names.compute_nid("sceTwinCall")
        self.assertEqual(stubs, {
            ("libSceTwin.prx", twin): "sceTwinCall",
            ("libSceTwin.prx", nid_names.compute_nid("printf")): "printf_nid_postfix",
            ("libSceOnly.prx", nid_names.compute_nid("sceOnlyPending")): "sceOnlyPending"})
        self.assertNotIn(("libSceTwin.native.prx", twin), stubs)
        self.assertNotEqual(nid_names.compute_nid("printf"), nid_names.compute_nid("printf_nid_postfix"))

    def test_stub_in_one_library_is_not_hidden_by_another(self):
        source = self.work.source
        write_source(source, "libA", DONE_SOURCE.format(name="sceTwinCall"))
        write_source(source, "libB", STUB_SOURCE.format(name="sceTwinCall"))
        nid = nid_names.compute_nid("sceTwinCall")
        stubs = import_audit.source_stubs(source)
        exports = {nid: ["libA.prx", "libB.prx"]}
        records, _ = import_audit.audit([(nid, "libB.prx", False)], {nid: ["libB.prx"]}, stubs, {"libB.prx"}, set())
        self.assertEqual((records[0]["class"], records[0]["name"]), ("stub", "sceTwinCall"))
        records, _ = import_audit.audit([(nid, "libA.prx", False)], {nid: ["libA.prx"]}, stubs, {"libA.prx"}, set())
        self.assertEqual((records[0]["class"], records[0]["name"]), ("implemented", None))
        records, _ = import_audit.audit([(nid, "libB.prx", False)], exports, stubs, {"libA.prx", "libB.prx"}, set())
        self.assertEqual(records[0]["class"], "implemented")

    def test_cmake_shared_library_preserves_stub_names_and_implemented_exports(self):
        work = self.work
        owner, library = "libZOwner", "libAOwner.native"
        pending, runtime, live = "scePending", "printf_nid_postfix", "sceLive"
        alias_nid, alias_name = "AAAAAAAAAAA", "sceOwnerUnknown"
        write_source(work.source, owner, STUB_SOURCE.format(name=pending) + STUB_SOURCE.format(name=runtime)
                     + f'APS5_EXPORT("{alias_nid}", {alias_name});\n' + STUB_SOURCE.format(name=alias_name)
                     + DONE_SOURCE.format(name=live))
        shared = work.source / library
        shared.mkdir()
        (shared / "CMakeLists.txt").write_text(f'include(${{CMAKE_CURRENT_SOURCE_DIR}}/../{owner}/OwnerLibrary.cmake)\n')
        expected = {nid_names.compute_nid(pending): pending, nid_names.compute_nid("printf"): runtime, alias_nid: alias_name}
        live_nid = nid_names.compute_nid(live)
        (work.libs / (library + ".prx")).write_bytes(exporting(*expected, live_nid))
        registry, result = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [(nid, library + ".prx") for nid in [*expected, live_nid]])
        code, _, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (0, ""))
        records = {record["nid"]: record for record in json.loads(result.read_text())["imports"]}
        self.assertEqual({nid: (records[nid]["class"], records[nid]["name"]) for nid in expected},
                         {nid: ("stub", name) for nid, name in expected.items()})
        self.assertEqual((records[live_nid]["class"], records[live_nid]["name"]), ("implemented", None))

    def test_source_include_shared_library_preserves_stubs(self):
        source = self.work.source
        write_source(source, "libOwner", STUB_SOURCE.format(name="scePending"))
        write_source(source, "libShared", '#include "prx/libOwner/Export.cpp"\n')
        nid = nid_names.compute_nid("scePending")
        self.assertEqual(import_audit.source_stubs(source), {
            ("libOwner.prx", nid): "scePending", ("libShared.prx", nid): "scePending"})

    def test_transitive_shared_library_preserves_stubs(self):
        source = self.work.source
        write_source(source, "libZOwner", STUB_SOURCE.format(name="scePending"))
        for library, owner in (("libA", "libB"), ("libB", "libZOwner")):
            shared = source / library
            shared.mkdir()
            (shared / "CMakeLists.txt").write_text(f'include(${{CMAKE_CURRENT_SOURCE_DIR}}/../{owner}/OwnerLibrary.cmake)\n')
        nid = nid_names.compute_nid("scePending")
        self.assertEqual(import_audit.source_stubs(source), {
            (library + ".prx", nid): "scePending" for library in ("libA", "libB", "libZOwner")})

    def test_shared_source_cycle_fails(self):
        source = self.work.source
        for library, owner in (("libA", "libB"), ("libB", "libA")):
            shared = source / library
            shared.mkdir()
            (shared / "CMakeLists.txt").write_text(f'include(${{CMAKE_CURRENT_SOURCE_DIR}}/../{owner}/OwnerLibrary.cmake)\n')
        with self.assertRaisesRegex(import_audit.AuditError, "shared source cycle.*libA.*libB"):
            import_audit.source_stubs(source)

    def test_formatted_export_aliases_remain_stubs(self):
        work = self.work
        nid = "AAAAAAAAAAA"
        (work.libs / "libSceAlias.prx").write_bytes(exporting(nid))
        registry = work.root / "game.json"
        result = work.root / "audit.json"
        write_registry(registry, [(nid, "libSceAlias.prx")])
        aliases = [
            'APS5_EXPORT (\n "AAAAAAAAAAA",\n NAME\n);\n',
            'APS5_EXPORT(/* nid */ "AAAAAAAAAAA", /* name */ NAME);\n',
            'APS5_EX\\\nPORT("AAAAAAAAAAA", NAME);\n',
        ]
        for name in ("sceAliasUnknown", "sceAliasedCall"):
            for alias in aliases:
                with self.subTest(name=name, alias=alias):
                    write_source(work.source, "libSceAlias", alias.replace("NAME", name) + STUB_SOURCE.format(name=name))
                    code, _, err = work.run(registry, "--json", str(result))
                    self.assertEqual((code, err), (0, ""))
                    record, = json.loads(result.read_text())["imports"]
                    self.assertEqual((record["class"], record["name"]), ("stub", name))

    def test_comments_and_literals_do_not_override_export_aliases(self):
        work = self.work
        nid, name = "AAAAAAAAAAA", "sceAliasUnknown"
        (work.libs / "libSceAlias.prx").write_bytes(exporting(nid))
        registry = work.root / "game.json"
        result = work.root / "audit.json"
        write_registry(registry, [(nid, "libSceAlias.prx")])
        source = 'APS5_EXPORT("AAAAAAAAAAA", sceAliasUnknown);\n' + STUB_SOURCE.format(name=name)
        decoys = [
            '// APS5_EXPORT("BBBBBBBBBBB", sceAliasUnknown);\n',
            '/* APS5_EXPORT("BBBBBBBBBBB", sceAliasUnknown); */\n',
            'auto example = R"text(APS5_EXPORT("BBBBBBBBBBB", sceAliasUnknown);)text";\n',
        ]
        for decoy in decoys:
            with self.subTest(decoy=decoy):
                write_source(work.source, "libSceAlias", source + decoy)
                code, _, err = work.run(registry, "--json", str(result))
                self.assertEqual((code, err), (0, ""))
                record, = json.loads(result.read_text())["imports"]
                self.assertEqual((record["class"], record["name"]), ("stub", name))

    @unittest.skipUnless((import_audit.ROOT / ".git").exists(), "needs a git checkout")
    def test_json_is_stamped_with_the_source_commit(self):
        work = self.work
        import_audit.subprocess.run(["git", "-C", str(work.source), "init", "-q"], check=True)
        import_audit.subprocess.run(["git", "-C", str(work.source), "-c", "user.name=Audit test", "-c", "user.email=audit@example.invalid", "commit", "--allow-empty", "-qm", "Source stamp fixture"], check=True)
        commit, dirty = import_audit.git_stamp(work.source)
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        result = work.root / "stamped.json"
        work.run(registry, "--json", str(result))
        data = json.loads(result.read_text())
        self.assertRegex(data["source_commit"], r"^[0-9a-f]{40}$")
        self.assertEqual((data["source_commit"], data["source_dirty"]), (commit, dirty))
        self.assertEqual(data["registries"], [str(registry)])

    def test_nid_anchor_matches_the_known_pair(self):
        self.assertEqual(nid_names.compute_nid(MESSAGE_NAME), MESSAGE_NID)

    def test_unsupported_elf_versions_preserve_the_audit_report(self):
        work = self.work
        registry, result = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        library = work.libs / "libSceA.prx"
        images = (exporting("AAAAAAAAAAA"),
                  build_sectionless_elf([("AAAAAAAAAAA", 1, GLOBAL_FUNCTION)]),
                  build_sectionless_elf([("AAAAAAAAAAA", 1, GLOBAL_FUNCTION)], gnu_hash=True))
        previous = b'{"previous":"complete report"}\n'
        for index, valid in enumerate(images):
            for offset, layout in ((6, "<B"), (20, "<I")):
                for version in (0, 2):
                    with self.subTest(image=index, offset=offset, version=version):
                        image = bytearray(valid)
                        struct.pack_into(layout, image, offset, version)
                        library.write_bytes(image)
                        result.write_bytes(previous)
                        code, out, err = work.run(registry, "--json", str(result))
                        self.assertEqual((code, out), (2, ""))
                        self.assertIn("ELF version", err)
                        self.assertIn(str(library), err)
                        self.assertEqual(result.read_bytes(), previous)

    def test_elf_reader(self):
        image = build_elf([("one", 1, GLOBAL_FUNCTION), ("weak", 1, 0x22), ("undefined", 0, GLOBAL_FUNCTION), ("local", 1, LOCAL_FUNCTION)])
        path = Path("lib.prx")
        self.assertEqual(import_audit.elf_exports(path, image), {"one", "weak"})
        self.assertEqual(import_audit.elf_exports(path, exporting()), set())
        for cut in (10, 64, len(image) - 5):
            with self.assertRaisesRegex(import_audit.AuditError, "lib.prx"):
                import_audit.elf_exports(path, image[:cut])

    def test_elf_imports_reader(self):
        image = build_elf([("one", 1, GLOBAL_FUNCTION), ("two", 0, GLOBAL_FUNCTION), ("three", 0, 0x22)], ["libc.prx", "libSceZip.prx"])
        path = Path("mod.prx")
        self.assertEqual(import_audit.elf_imports(path, image), ({"two", "three"}, {"libc.prx", "libSceZip.prx"}))
        self.assertEqual(import_audit.elf_imports(path, exporting()), (set(), set()))
        for cut in (10, 64, len(image) - 5):
            with self.assertRaisesRegex(import_audit.AuditError, "mod.prx"):
                import_audit.elf_imports(path, image[:cut])

    def test_elf_dynamic_symbol_table_rejects_ranges_outside_file(self):
        image = exporting("alpha")
        for offset, size in ((len(image) + 1, 0), (2**64 - 1, 0), (len(image) - 23, 24), (len(image), 24), (len(image) + 1, 24)):
            with self.subTest(offset=offset, size=size):
                with self.assertRaisesRegex(import_audit.AuditError, r"lib.prx: .*outside the file"):
                    import_audit.elf_exports(Path("lib.prx"), with_elf_symbol_table_range(image, offset, size))

    def test_elf_dynamic_symbol_table_accepts_ranges_ending_at_eof(self):
        image = exporting("alpha")
        self.assertEqual(import_audit.elf_exports(Path("lib.prx"), with_elf_symbol_table_range(image, len(image), 0)), set())
        table_offset = struct.unpack_from("<Q", image, struct.unpack_from("<Q", image, 40)[0] + 64 + 24)[0]
        table = image[table_offset:table_offset + 48]
        relocated = with_elf_symbol_table_range(image + table, len(image), len(table))
        self.assertEqual(import_audit.elf_exports(Path("lib.prx"), relocated), {"alpha"})

    def test_invalid_elf_dynamic_symbol_table_exits_two(self):
        work = self.work
        library = work.libs / "libSceA.prx"
        image = exporting("AAAAAAAAAAA")
        library.write_bytes(with_elf_symbol_table_range(image, len(image) + 1, 0))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        result = work.root / "audit.json"
        code, out, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, out), (2, ""))
        self.assertIn(f"FAIL: {library}: dynamic symbol table", err)
        self.assertIn("outside the file", err)
        self.assertFalse(result.exists())

    def test_pe_reader(self):
        path = Path("lib.prx")
        self.assertEqual(import_audit.pe_exports(path, build_pe(["alpha", "beta"])), {"alpha", "beta"})
        self.assertEqual(import_audit.pe_exports(path, build_pe([])), set())
        image = build_pe(["alpha"])
        for cut in (0x3c, 0x60, 0x210):
            with self.assertRaisesRegex(import_audit.AuditError, "lib.prx"):
                import_audit.pe_exports(path, image[:cut])

    def test_pe_ignores_bytes_after_the_declared_directory_count(self):
        image = bytearray(build_pe(["alpha"]))
        struct.pack_into("<I", image, 0x58 + 108, 0)
        with self.assertRaises(import_audit.AuditError):
            import_audit.pe_exports(Path("lib.prx"), image)

    def test_pe_null_export_address_is_not_an_export(self):
        image = bytearray(build_pe(["alpha"]))
        struct.pack_into("<I", image, 0x200 + 40, 0)
        self.assertEqual(import_audit.pe_exports(Path("lib.prx"), image), set())

    def test_pe_export_ordinal_must_index_the_address_table(self):
        image = bytearray(build_pe(["alpha"]))
        struct.pack_into("<H", image, 0x200 + 48, 1)
        with self.assertRaises(import_audit.AuditError):
            import_audit.pe_exports(Path("lib.prx"), image)

    def test_pe_export_name_cannot_terminate_in_unmapped_overlay(self):
        image = bytearray(build_pe(["alpha"]))
        image[0x200 + 55] = ord("x")
        image[0x238:] = b"y" * (len(image) - 0x238)
        image += b"\0"
        with self.assertRaises(import_audit.AuditError):
            import_audit.pe_exports(Path("lib.prx"), image)

    def test_pe_exports_can_reside_in_headers(self):
        image = bytearray(build_pe(["alpha"]))
        raw = bytes(image[0x200:0x238])
        image[0x200:0x200] = bytes(0x200)
        image[0x200:0x238] = raw
        struct.pack_into("<I", image, 0x58 + 60, 0x400)
        struct.pack_into("<I", image, 0x58 + 112, 0x200)
        struct.pack_into("<III", image, 0x200 + 28, 0x228, 0x22c, 0x230)
        struct.pack_into("<I", image, 0x22c, 0x232)
        struct.pack_into("<I", image, 0x58 + 240 + 20, 0x400)
        struct.pack_into("<I", image, 0x58 + 280 + 20, 0x438)
        self.assertEqual(import_audit.pe_exports(Path("lib.prx"), image), {"alpha"})

    def test_elf_extended_section_count_keeps_exports(self):
        image = bytearray(exporting("alpha"))
        section_offset = struct.unpack_from("<Q", image, 40)[0]
        image.extend(bytes((0xff00 - 3) * 64))
        struct.pack_into("<H", image, 60, 0)
        struct.pack_into("<Q", image, section_offset + 32, 0xff00)
        self.assertEqual(import_audit.elf_exports(Path("lib.prx"), image), {"alpha"})

    def test_elf_extended_undefined_index_is_not_an_export(self):
        image = bytearray(exporting("alpha"))
        section_offset = struct.unpack_from("<Q", image, 40)[0]
        symbol_offset = struct.unpack_from("<Q", image, section_offset + 64 + 24)[0]
        index_offset = len(image) + 64
        image.extend(struct.pack("<IIQQQQIIQQ", 0, 18, 0, 0, index_offset, 8, 1, 0, 4, 4))
        image.extend(struct.pack("<II", 0, 0))
        struct.pack_into("<H", image, 60, 4)
        struct.pack_into("<H", image, symbol_offset + 24 + 6, 0xffff)
        self.assertEqual(import_audit.elf_exports(Path("lib.prx"), image), set())
        struct.pack_into("<I", image, index_offset + 4, 1)
        self.assertEqual(import_audit.elf_exports(Path("lib.prx"), image), {"alpha"})

    def test_pe_export_aliases_share_an_address(self):
        image = bytearray(build_pe(["alpha", "beta"]))
        struct.pack_into("<H", image, 0x200 + 56 + 2, 0)
        self.assertEqual(import_audit.pe_exports(Path("lib.prx"), image), {"alpha", "beta"})

    def test_module_dependencies_stop_at_dynamic_terminator(self):
        work = self.work
        (work.libs / "libc.prx").write_bytes(exporting())
        image = bytearray(build_elf([], ["libc.prx", "libSceGhost.prx"]))
        sections = struct.unpack_from("<Q", image, 40)[0]
        dynamic = struct.unpack_from("<Q", image, sections + 192 + 24)[0]
        struct.pack_into("<qQ", image, dynamic, 0, 0)
        (work.modules / "module.prx").write_bytes(image)
        registry, result = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [])
        code, _, err = work.run(registry, "--json", str(result))
        self.assertEqual((code, err), (0, ""))
        self.assertEqual(json.loads(result.read_text())["missing_libraries"], {})
        struct.pack_into("<qQ", image, dynamic, 1, 1)
        struct.pack_into("<qQ", image, dynamic + 16, 0, 0)
        self.assertEqual(import_audit.elf_imports("module.prx", image)[1], {"libc.prx"})

    def test_pe32_uses_its_own_directory_layout(self):
        image = bytearray(build_pe(["alpha"]))
        struct.pack_into("<H", image, 0x58, 0x10b)
        struct.pack_into("<I", image, 0x58 + 92, 16)
        struct.pack_into("<II", image, 0x58 + 96, 0x1000, 56)
        self.assertEqual(import_audit.pe_exports(Path("lib.prx"), image), {"alpha"})


    def test_elf_unnamed_defined_symbol_is_not_an_export(self):
        image = bytearray(exporting("alpha"))
        section_offset = struct.unpack_from("<Q", image, 40)[0]
        symbol_offset = struct.unpack_from("<Q", image, section_offset + 64 + 24)[0]
        struct.pack_into("<I", image, symbol_offset + 24, 0)
        self.assertEqual(import_audit.elf_exports(Path("lib.prx"), image), set())

    def test_elf_preserves_non_utf8_symbol_bytes(self):
        image = bytearray(exporting("alpha"))
        image[65] = 0xff
        self.assertEqual(import_audit.elf_exports(Path("lib.prx"), image), {"\udcfflpha"})

    def test_elf_rejects_missing_regular_symbol_section(self):
        image = build_elf([("alpha", 3, GLOBAL_FUNCTION)])
        with self.assertRaisesRegex(import_audit.AuditError, "section index"):
            import_audit.elf_exports(Path("lib.prx"), image)
        self.assertEqual(import_audit.elf_exports(Path("lib.prx"), build_elf([("absolute", 0xfff1, GLOBAL_FUNCTION)])), {"absolute"})

    def test_pe_forwarder_cannot_end_outside_export_directory(self):
        image = bytearray(build_pe(["alpha"]))
        struct.pack_into("<I", image, 0x200 + 40, 0x1032)
        struct.pack_into("<II", image, 0x58 + 112, 0x1000, 55)
        with self.assertRaisesRegex(import_audit.AuditError, "forwarder"):
            import_audit.pe_exports(Path("lib.prx"), image)

    def test_pe_forwarder_inside_export_directory_keeps_public_name(self):
        image = bytearray(build_pe(["alpha"]))
        target = b"NTDLL.#27\0"
        image[0x238:0x238] = target
        struct.pack_into("<I", image, 0x200 + 40, 0x1038)
        struct.pack_into("<II", image, 0x58 + 112, 0x1000, 56 + len(target))
        struct.pack_into("<I", image, 0x58 + 240 + 8, 56 + len(target))
        struct.pack_into("<I", image, 0x58 + 240 + 16, 56 + len(target))
        struct.pack_into("<I", image, 0x58 + 280 + 20, 0x238 + len(target))
        self.assertEqual(import_audit.pe_exports(Path("lib.prx"), image), {"alpha"})

    def test_pe_export_name_pointer_table_must_be_sorted(self):
        image = build_pe(["beta", "alpha"])
        with self.assertRaisesRegex(import_audit.AuditError, "sorted"):
            import_audit.pe_exports(Path("lib.prx"), image)

    def test_pe_export_name_must_be_ascii(self):
        image = bytearray(build_pe(["alpha"]))
        image[0x200 + 50:0x200 + 52] = b"\xc3\xa9"
        with self.assertRaisesRegex(import_audit.AuditError, "ASCII"):
            import_audit.pe_exports(Path("lib.prx"), image)

    def test_libraries_with_conflicting_basenames_are_not_merged(self):
        first, second = self.work.libs, self.work.root / "other-libs"
        second.mkdir()
        (first / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        (second / "libSceA.prx").write_bytes(exporting("BBBBBBBBBBB"))
        with self.assertRaisesRegex(import_audit.AuditError, "ambiguous"):
            import_audit.built_libraries([first, second])
        (second / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        self.assertEqual(import_audit.built_libraries([first, second, first]), ({"AAAAAAAAAAA": ["libSceA.prx"]}, {"libSceA.prx"}))

    def test_json_output_cannot_overwrite_registry_or_names(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        before = registry.read_bytes()
        code, out, err = work.run(registry, "--json", str(registry))
        self.assertEqual((code, out), (2, ""))
        self.assertIn("input", err)
        self.assertEqual(registry.read_bytes(), before)
        names = work.root / "names.csv"
        names.write_text("AAAAAAAAAAA name\n")
        code, out, err = work.run(registry, "--json", str(names), "--names", str(names))
        self.assertEqual((code, out), (2, ""))
        self.assertEqual(names.read_text(), "AAAAAAAAAAA name\n")

    def test_json_output_cannot_overwrite_hard_linked_input(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        output = work.root / "hard-link.json"
        os.link(registry, output)
        before = registry.read_bytes()
        code, out, err = work.run(registry, "--json", str(output))
        self.assertEqual((code, out), (2, ""))
        self.assertIn("input", err)
        self.assertEqual(registry.read_bytes(), before)

    def test_git_stamp_uses_selected_source_tree(self):
        completed = type("Completed", (), {"stdout": "abcdef\n"})()
        with patch.object(import_audit.subprocess, "run", return_value=completed) as run:
            self.assertEqual(import_audit.git_stamp(self.work.source), ("abcdef", True))
        self.assertEqual([call.args[0][2] for call in run.call_args_list], [str(self.work.source), str(self.work.source)])

    def test_json_keeps_source_commit_when_a_broken_submodule_prevents_status(self):
        work = self.work
        command = ["git", "-C", str(work.source)]
        identity = ["-c", "user.name=Audit test", "-c", "user.email=audit@example.invalid"]
        subprocess.run(command + ["init", "-q"], check=True, capture_output=True)
        subprocess.run(command + identity + ["commit", "--allow-empty", "-qm", "Source fixture"], check=True, capture_output=True)
        commit = subprocess.check_output(command + ["rev-parse", "HEAD"], text=True).strip()
        (work.source / ".gitmodules").write_text(
            '[submodule "damaged"]\n\tpath = damaged\n\turl = https://example.invalid/damaged.git\n', encoding="utf-8")
        subprocess.run(command + ["add", ".gitmodules"], check=True, capture_output=True)
        subprocess.run(command + ["update-index", "--add", "--cacheinfo", "160000", commit, "damaged"], check=True, capture_output=True)
        subprocess.run(command + identity + ["commit", "-qm", "Submodule fixture"], check=True, capture_output=True)
        damaged = work.source / "damaged"
        damaged.mkdir()
        (damaged / ".git").write_text("gitdir: ../missing-submodule-git\n", encoding="utf-8")
        commit = subprocess.check_output(command + ["rev-parse", "HEAD"], text=True).strip()
        status = subprocess.run(command + ["status", "--porcelain"], capture_output=True)
        self.assertNotEqual(status.returncode, 0)
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry, report = work.root / "game.json", work.root / "audit.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        code, _, err = work.run(registry, "--json", str(report))
        self.assertEqual((code, err), (0, ""))
        data = json.loads(report.read_text(encoding="utf-8"))
        self.assertEqual(data["source_commit"], commit)
        self.assertIsNone(data["source_dirty"])
        self.assertEqual(data["unique_by_class"], {"implemented": 1, "stub": 0, "absent": 0, "module": 0})

    def test_git_stamp_keeps_commit_when_status_cannot_start(self):
        completed = subprocess.CompletedProcess([], 0, stdout="abcdef\n")
        with patch.object(import_audit.subprocess, "run", side_effect=[completed, OSError("status unavailable")]):
            self.assertEqual(import_audit.git_stamp(self.work.source), ("abcdef", None))

    def test_library_directories(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(build_pe(["AAAAAAAAAAA"]))
        (work.libs / "libSceB.prx").write_bytes(exporting("AAAAAAAAAAA", "BBBBBBBBBBB"))
        exports, libraries = import_audit.built_libraries([work.libs])
        self.assertEqual(exports, {"AAAAAAAAAAA": ["libSceA.prx", "libSceB.prx"], "BBBBBBBBBBB": ["libSceB.prx"]})
        self.assertEqual(libraries, {"libSceA.prx", "libSceB.prx"})
        (work.libs / "libSceC.prx").write_bytes(b"text")
        with self.assertRaisesRegex(import_audit.AuditError, r"libSceC.prx: neither ELF nor PE"):
            import_audit.built_libraries([work.libs])
        with self.assertRaisesRegex(import_audit.AuditError, "no .prx files"):
            import_audit.built_libraries([work.modules])
        with self.assertRaisesRegex(import_audit.AuditError, "not a directory"):
            import_audit.built_libraries([work.root / "absent"])

    def test_registry_errors(self):
        path = self.work.root / "registry.json"
        path.write_text("{}")
        with self.assertRaisesRegex(import_audit.AuditError, "JSON list"):
            import_audit.read_registry(path)
        path.write_text("[1")
        with self.assertRaisesRegex(import_audit.AuditError, "cannot read registry"):
            import_audit.read_registry(path)
        path.write_bytes(b"\xff\xfe\x00")
        with self.assertRaisesRegex(import_audit.AuditError, "cannot read registry"):
            import_audit.read_registry(path)
        path.write_text('[{"nid": "AAAAAAAAAAA"}]')
        with self.assertRaisesRegex(import_audit.AuditError, r"entry 0 needs string fields"):
            import_audit.read_registry(path)
        write_registry(path, [("AAAAAAAAAAA", ""), ("bad\x01nid", "")])
        with self.assertRaisesRegex(import_audit.AuditError, r"entry 1 has an invalid NID 'bad\\x01nid'"):
            import_audit.read_registry(path)
        write_registry(path, [("AAAAAAAAAAA#A#B", "libSceA.prx")], encoding="utf-8-sig")
        self.assertEqual(import_audit.read_registry(path), [("AAAAAAAAAAA", "libSceA.prx", False)])

    def test_names_never_download(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [(MESSAGE_NID, "libSceA.prx"), ("DDDDDDDDDDD", "libSceA.prx")])
        with patch.object(nid_names.urllib.request, "urlretrieve", side_effect=AssertionError("download attempted")):
            code, _, err = work.run(registry, "--names", str(work.root / "missing.csv"))
        self.assertEqual(code, 2)
        self.assertIn("never downloads", err)
        names = work.root / "aerolib.csv"
        names.write_text(f"{MESSAGE_NID} {MESSAGE_NAME}\nDDDDDDDDDDD wrongname\n")
        result = work.root / "named.json"
        work.run(registry, "--names", str(names), "--json", str(result))
        named = {record["nid"]: record for record in json.loads(result.read_text())["imports"]}
        self.assertEqual((named[MESSAGE_NID]["name"], named[MESSAGE_NID]["name_verified"]), (MESSAGE_NAME, True))
        self.assertEqual((named["DDDDDDDDDDD"]["name"], named["DDDDDDDDDDD"]["name_verified"]), ("wrongname", False))

    def test_conservation_check_fires(self):
        records = [{"references": 2, "class": "absent"}, {"references": 1, "class": "stub"}]
        import_audit.check_conservation(3, records)
        with self.assertRaisesRegex(import_audit.AuditError, "3 classified"):
            import_audit.check_conservation(4, records)
        with self.assertRaisesRegex(import_audit.AuditError, "unknown classes"):
            import_audit.check_conservation(1, [{"references": 1, "class": "lost"}])

    def test_errors_exit_two_with_the_failing_value(self):
        work = self.work
        (work.libs / "libSceA.prx").write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("short", "libSceA.prx")])
        code, out, err = work.run(registry)
        self.assertEqual((code, out), (2, ""))
        self.assertIn("game.json: entry 0 has an invalid NID 'short'", err)

    def test_unreadable_library_and_unwritable_json_exit_two(self):
        work = self.work
        library = work.libs / "libSceA.prx"
        library.write_bytes(exporting("AAAAAAAAAAA"))
        registry = work.root / "game.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceA.prx")])
        code, out, err = work.run(registry, "--json", str(work.modules))
        self.assertEqual((code, out), (2, ""))
        self.assertIn("FAIL: ", err)
        self.assertIn(str(work.modules), err)
        denied = PermissionError(13, "Permission denied", str(library))
        with patch.object(Path, "read_bytes", side_effect=denied):
            code, out, err = work.run(registry)
        self.assertEqual((code, out), (2, ""))
        self.assertIn(f"FAIL: Permission denied: {library}", err)


class StrictProviderTests(unittest.TestCase):
    def test_named_provider_mismatch_is_optional_failure(self):
        work = Workspace()
        self.addCleanup(work.close)
        (work.libs / "libSceExpected.prx").write_bytes(build_pe(["BBBBBBBBBBB"]))
        (work.libs / "libSceOther.prx").write_bytes(build_pe(["AAAAAAAAAAA"]))
        registry = work.root / "registry.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceExpected.prx")])
        result = work.root / "audit.json"
        self.assertEqual(work.run(registry)[0], 0)
        code, out, err = work.run(registry, "--strict-providers", "--json", str(result))
        self.assertEqual((code, err), (1, ""))
        report = json.loads(result.read_text())
        self.assertEqual(report["library_mismatch"], 1)
        self.assertEqual(report["imports"][0]["providers"], ["libSceOther.prx"])
        self.assertIn("only by a library other than", out)

    def test_matching_provider_passes(self):
        work = Workspace()
        self.addCleanup(work.close)
        (work.libs / "libSceExpected.prx").write_bytes(build_pe(["AAAAAAAAAAA"]))
        registry = work.root / "registry.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceExpected.prx")])
        self.assertEqual(work.run(registry, "--strict-providers")[0], 0)

    def test_shared_libc_provider_remains_valid(self):
        work = Workspace()
        self.addCleanup(work.close)
        (work.libs / "libSceExpected.prx").write_bytes(build_pe([]))
        (work.libs / "libc.prx").write_bytes(build_pe(["AAAAAAAAAAA"]))
        registry = work.root / "registry.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceExpected.prx")])
        self.assertEqual(work.run(registry, "--strict-providers")[0], 0)

    def test_missing_provider_file_still_fails(self):
        work = Workspace()
        self.addCleanup(work.close)
        (work.libs / "libc.prx").write_bytes(build_pe(["AAAAAAAAAAA"]))
        registry = work.root / "registry.json"
        write_registry(registry, [("AAAAAAAAAAA", "libSceMissing.prx")])
        self.assertEqual(work.run(registry, "--strict-providers")[0], 1)


if __name__ == "__main__":
    unittest.main()