import datetime
from enum import Enum as PyEnum
from typing import Any
from typing import List
from typing import Literal
from typing import NotRequired
from typing import TypedDict
from uuid import UUID

from fastapi_users.db import SQLAlchemyBaseOAuthAccountTableUUID
from fastapi_users.db import SQLAlchemyBaseUserTableUUID
from fastapi_users_db_sqlalchemy.access_token import SQLAlchemyBaseAccessTokenTableUUID
from sqlalchemy import Boolean
from sqlalchemy import DateTime
from sqlalchemy import Enum
from sqlalchemy import ForeignKey
from sqlalchemy import ForeignKeyConstraint
from sqlalchemy import func
from sqlalchemy import Index
from sqlalchemy import Integer
from sqlalchemy import Sequence
from sqlalchemy import String
from sqlalchemy import Text
from sqlalchemy.dialects import postgresql
from sqlalchemy.orm import DeclarativeBase
from sqlalchemy.orm import Mapped
from sqlalchemy.orm import mapped_column
from sqlalchemy.orm import relationship

from danswer.auth.schemas import UserRole
from danswer.configs.constants import DEFAULT_BOOST
from danswer.configs.constants import DocumentSource
from danswer.configs.constants import MessageType
from danswer.configs.constants import QAFeedbackType
from danswer.configs.constants import SearchFeedbackType
from danswer.connectors.models import InputType
from danswer.search.models import SearchType


class IndexingStatus(str, PyEnum):
    NOT_STARTED = "not_started"
    IN_PROGRESS = "in_progress"
    SUCCESS = "success"
    FAILED = "failed"


# these may differ in the future, which is why we're okay with this duplication
class DeletionStatus(str, PyEnum):
    NOT_STARTED = "not_started"
    IN_PROGRESS = "in_progress"
    SUCCESS = "success"
    FAILED = "failed"


# Consistent with Celery task statuses
class TaskStatus(str, PyEnum):
    PENDING = "PENDING"
    STARTED = "STARTED"
    SUCCESS = "SUCCESS"
    FAILURE = "FAILURE"


class Base(DeclarativeBase):
    pass


class OAuthAccount(SQLAlchemyBaseOAuthAccountTableUUID, Base):
    # even an almost empty token from keycloak will not fit the default 1024 bytes
    access_token: Mapped[str] = mapped_column(Text, nullable=False)  # type: ignore


class User(SQLAlchemyBaseUserTableUUID, Base):
    oauth_accounts: Mapped[List[OAuthAccount]] = relationship(
        "OAuthAccount", lazy="joined"
    )
    role: Mapped[UserRole] = mapped_column(
        Enum(UserRole, native_enum=False, default=UserRole.BASIC)
    )
    credentials: Mapped[List["Credential"]] = relationship(
        "Credential", back_populates="user", lazy="joined"
    )
    query_events: Mapped[List["QueryEvent"]] = relationship(
        "QueryEvent", back_populates="user"
    )
    chat_sessions: Mapped[List["ChatSession"]] = relationship(
        "ChatSession", back_populates="user"
    )


class AccessToken(SQLAlchemyBaseAccessTokenTableUUID, Base):
    pass


"""
Association tables
NOTE: must be at the top since they are referenced by other tables
"""


class Persona__DocumentSet(Base):
    __tablename__ = "persona__document_set"

    persona_id: Mapped[int] = mapped_column(ForeignKey("persona.id"), primary_key=True)
    document_set_id: Mapped[int] = mapped_column(
        ForeignKey("document_set.id"), primary_key=True
    )


class DocumentSet__ConnectorCredentialPair(Base):
    __tablename__ = "document_set__connector_credential_pair"

    document_set_id: Mapped[int] = mapped_column(
        ForeignKey("document_set.id"), primary_key=True
    )
    connector_credential_pair_id: Mapped[int] = mapped_column(
        ForeignKey("connector_credential_pair.id"), primary_key=True
    )
    # if `True`, then is part of the current state of the document set
    # if `False`, then is a part of the prior state of the document set
    # rows with `is_current=False` should be deleted when the document
    # set is updated and should not exist for a given document set if
    # `DocumentSet.is_up_to_date == True`
    is_current: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        default=True,
        primary_key=True,
    )

    document_set: Mapped["DocumentSet"] = relationship("DocumentSet")


class ConnectorCredentialPair(Base):
    """Connectors and Credentials can have a many-to-many relationship
    I.e. A Confluence Connector may have multiple admin users who can run it with their own credentials
    I.e. An admin user may use the same credential to index multiple Confluence Spaces
    """

    __tablename__ = "connector_credential_pair"
    # NOTE: this `id` column has to use `Sequence` instead of `autoincrement=True`
    # due to some SQLAlchemy quirks + this not being a primary key column
    id: Mapped[int] = mapped_column(
        Integer,
        Sequence("connector_credential_pair_id_seq"),
        unique=True,
        nullable=False,
    )
    name: Mapped[str] = mapped_column(
        String, unique=True, nullable=True
    )  # nullable for backwards compatability
    connector_id: Mapped[int] = mapped_column(
        ForeignKey("connector.id"), primary_key=True
    )
    credential_id: Mapped[int] = mapped_column(
        ForeignKey("credential.id"), primary_key=True
    )
    # controls whether the documents indexed by this CC pair are visible to all
    # or if they are only visible to those with that are given explicit access
    # (e.g. via owning the credential or being a part of a group that is given access)
    is_public: Mapped[bool] = mapped_column(
        Boolean,
        default=True,
        nullable=False,
    )
    # Time finished, not used for calculating backend jobs which uses time started (created)
    last_successful_index_time: Mapped[datetime.datetime | None] = mapped_column(
        DateTime(timezone=True), default=None
    )
    last_attempt_status: Mapped[IndexingStatus | None] = mapped_column(
        Enum(IndexingStatus)
    )
    total_docs_indexed: Mapped[int] = mapped_column(Integer, default=0)

    connector: Mapped["Connector"] = relationship(
        "Connector", back_populates="credentials"
    )
    credential: Mapped["Credential"] = relationship(
        "Credential", back_populates="connectors"
    )
    document_sets: Mapped[List["DocumentSet"]] = relationship(
        "DocumentSet",
        secondary=DocumentSet__ConnectorCredentialPair.__table__,
        back_populates="connector_credential_pairs",
        overlaps="document_set",
    )


class Connector(Base):
    __tablename__ = "connector"

    id: Mapped[int] = mapped_column(primary_key=True)
    name: Mapped[str] = mapped_column(String)
    source: Mapped[DocumentSource] = mapped_column(
        Enum(DocumentSource, native_enum=False)
    )
    input_type = mapped_column(Enum(InputType, native_enum=False))
    connector_specific_config: Mapped[dict[str, Any]] = mapped_column(
        postgresql.JSONB()
    )
    refresh_freq: Mapped[int | None] = mapped_column(Integer, nullable=True)
    time_created: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )
    time_updated: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )
    disabled: Mapped[bool] = mapped_column(Boolean, default=False)

    credentials: Mapped[List["ConnectorCredentialPair"]] = relationship(
        "ConnectorCredentialPair",
        back_populates="connector",
        cascade="all, delete-orphan",
    )
    documents_by_connector: Mapped[
        List["DocumentByConnectorCredentialPair"]
    ] = relationship("DocumentByConnectorCredentialPair", back_populates="connector")
    index_attempts: Mapped[List["IndexAttempt"]] = relationship(
        "IndexAttempt", back_populates="connector"
    )


class Credential(Base):
    __tablename__ = "credential"

    id: Mapped[int] = mapped_column(primary_key=True)
    credential_json: Mapped[dict[str, Any]] = mapped_column(postgresql.JSONB())
    user_id: Mapped[UUID | None] = mapped_column(ForeignKey("user.id"), nullable=True)
    # if `true`, then all Admins will have access to the credential
    is_admin: Mapped[bool] = mapped_column(Boolean, default=True)
    time_created: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )
    time_updated: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )

    connectors: Mapped[List["ConnectorCredentialPair"]] = relationship(
        "ConnectorCredentialPair",
        back_populates="credential",
        cascade="all, delete-orphan",
    )
    documents_by_credential: Mapped[
        List["DocumentByConnectorCredentialPair"]
    ] = relationship("DocumentByConnectorCredentialPair", back_populates="credential")
    index_attempts: Mapped[List["IndexAttempt"]] = relationship(
        "IndexAttempt", back_populates="credential"
    )
    user: Mapped[User | None] = relationship("User", back_populates="credentials")


class IndexAttempt(Base):
    """
    Represents an attempt to index a group of 1 or more documents from a
    source. For example, a single pull from Google Drive, a single event from
    slack event API, or a single website crawl.
    """

    __tablename__ = "index_attempt"

    id: Mapped[int] = mapped_column(primary_key=True)
    connector_id: Mapped[int | None] = mapped_column(
        ForeignKey("connector.id"),
        nullable=True,
    )
    credential_id: Mapped[int | None] = mapped_column(
        ForeignKey("credential.id"),
        nullable=True,
    )
    status: Mapped[IndexingStatus] = mapped_column(Enum(IndexingStatus))
    new_docs_indexed: Mapped[int | None] = mapped_column(Integer, default=0)
    total_docs_indexed: Mapped[int | None] = mapped_column(Integer, default=0)
    error_msg: Mapped[str | None] = mapped_column(
        Text, default=None
    )  # only filled if status = "failed"
    time_created: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
    )
    # when the actual indexing run began
    # NOTE: will use the api_server clock rather than DB server clock
    time_started: Mapped[datetime.datetime | None] = mapped_column(
        DateTime(timezone=True), default=None
    )
    time_updated: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
    )

    connector: Mapped[Connector] = relationship(
        "Connector", back_populates="index_attempts"
    )
    credential: Mapped[Credential] = relationship(
        "Credential", back_populates="index_attempts"
    )

    __table_args__ = (
        Index(
            "ix_index_attempt_latest_for_connector_credential_pair",
            "connector_id",
            "credential_id",
            "time_created",
        ),
    )

    def __repr__(self) -> str:
        return (
            f"<IndexAttempt(id={self.id!r}, "
            f"connector_id={self.connector_id!r}, "
            f"status={self.status!r}, "
            f"error_msg={self.error_msg!r})>"
            f"time_created={self.time_created!r}, "
            f"time_updated={self.time_updated!r}, "
        )


class DocumentByConnectorCredentialPair(Base):
    """Represents an indexing of a document by a specific connector / credential
    pair"""

    __tablename__ = "document_by_connector_credential_pair"

    id: Mapped[str] = mapped_column(ForeignKey("document.id"), primary_key=True)
    # TODO: transition this to use the ConnectorCredentialPair id directly
    connector_id: Mapped[int] = mapped_column(
        ForeignKey("connector.id"), primary_key=True
    )
    credential_id: Mapped[int] = mapped_column(
        ForeignKey("credential.id"), primary_key=True
    )

    connector: Mapped[Connector] = relationship(
        "Connector", back_populates="documents_by_connector"
    )
    credential: Mapped[Credential] = relationship(
        "Credential", back_populates="documents_by_credential"
    )


class QueryEvent(Base):
    __tablename__ = "query_event"

    id: Mapped[int] = mapped_column(primary_key=True)
    query: Mapped[str] = mapped_column(Text)
    # search_flow refers to user selection, None if user used auto
    selected_search_flow: Mapped[SearchType | None] = mapped_column(
        Enum(SearchType), nullable=True
    )
    llm_answer: Mapped[str | None] = mapped_column(Text, default=None)
    # Document IDs of the top context documents retrieved for the query (if any)
    # NOTE: not using a foreign key to enable easy deletion of documents without
    # needing to adjust `QueryEvent` rows
    retrieved_document_ids: Mapped[list[str] | None] = mapped_column(
        postgresql.ARRAY(String), nullable=True
    )
    feedback: Mapped[QAFeedbackType | None] = mapped_column(
        Enum(QAFeedbackType), nullable=True
    )
    user_id: Mapped[UUID | None] = mapped_column(ForeignKey("user.id"), nullable=True)
    time_created: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
    )

    user: Mapped[User | None] = relationship("User", back_populates="query_events")
    document_feedbacks: Mapped[List["DocumentRetrievalFeedback"]] = relationship(
        "DocumentRetrievalFeedback", back_populates="qa_event"
    )


class DocumentRetrievalFeedback(Base):
    __tablename__ = "document_retrieval_feedback"

    id: Mapped[int] = mapped_column(primary_key=True)
    qa_event_id: Mapped[int] = mapped_column(
        ForeignKey("query_event.id"),
    )
    document_id: Mapped[str] = mapped_column(
        ForeignKey("document.id"),
    )
    # How high up this document is in the results, 1 for first
    document_rank: Mapped[int] = mapped_column(Integer)
    clicked: Mapped[bool] = mapped_column(Boolean, default=False)
    feedback: Mapped[SearchFeedbackType | None] = mapped_column(
        Enum(SearchFeedbackType), nullable=True
    )

    qa_event: Mapped[QueryEvent] = relationship(
        "QueryEvent", back_populates="document_feedbacks"
    )
    document: Mapped["Document"] = relationship(
        "Document", back_populates="retrieval_feedbacks"
    )


class Document(Base):
    __tablename__ = "document"

    # this should correspond to the ID of the document
    # (as is passed around in Danswer)
    id: Mapped[str] = mapped_column(String, primary_key=True)
    # 0 for neutral, positive for mostly endorse, negative for mostly reject
    boost: Mapped[int] = mapped_column(Integer, default=DEFAULT_BOOST)
    hidden: Mapped[bool] = mapped_column(Boolean, default=False)
    semantic_id: Mapped[str] = mapped_column(String)
    # First Section's link
    link: Mapped[str | None] = mapped_column(String, nullable=True)
    doc_updated_at: Mapped[datetime.datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    # The following are not attached to User because the account/email may not be known
    # within Danswer
    # Something like the document creator
    primary_owners: Mapped[list[str] | None] = mapped_column(
        postgresql.ARRAY(String), nullable=True
    )
    # Something like assignee or space owner
    secondary_owners: Mapped[list[str] | None] = mapped_column(
        postgresql.ARRAY(String), nullable=True
    )
    # TODO if more sensitive data is added here for display, make sure to add user/group permission

    retrieval_feedbacks: Mapped[List[DocumentRetrievalFeedback]] = relationship(
        "DocumentRetrievalFeedback", back_populates="document"
    )


class DocumentSet(Base):
    __tablename__ = "document_set"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    name: Mapped[str] = mapped_column(String, unique=True)
    description: Mapped[str] = mapped_column(String)
    user_id: Mapped[UUID | None] = mapped_column(ForeignKey("user.id"), nullable=True)
    # whether or not changes to the document set have been propogated
    is_up_to_date: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)

    connector_credential_pairs: Mapped[list[ConnectorCredentialPair]] = relationship(
        "ConnectorCredentialPair",
        secondary=DocumentSet__ConnectorCredentialPair.__table__,
        back_populates="document_sets",
        overlaps="document_set",
    )
    personas: Mapped[list["Persona"]] = relationship(
        "Persona",
        secondary=Persona__DocumentSet.__table__,
        back_populates="document_sets",
    )


class ChatSession(Base):
    __tablename__ = "chat_session"

    id: Mapped[int] = mapped_column(primary_key=True)
    user_id: Mapped[UUID | None] = mapped_column(ForeignKey("user.id"), nullable=True)
    description: Mapped[str] = mapped_column(Text)
    deleted: Mapped[bool] = mapped_column(Boolean, default=False)
    # The following texts help build up the model's ability to use the context effectively
    time_updated: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
    )
    time_created: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )

    user: Mapped[User] = relationship("User", back_populates="chat_sessions")
    messages: Mapped[List["ChatMessage"]] = relationship(
        "ChatMessage", back_populates="chat_session", cascade="delete"
    )


class ToolInfo(TypedDict):
    name: str
    description: str


class Persona(Base):
    # TODO introduce user and group ownership for personas
    __tablename__ = "persona"

    id: Mapped[int] = mapped_column(primary_key=True)
    name: Mapped[str] = mapped_column(String)
    # Danswer retrieval, treated as a special tool
    retrieval_enabled: Mapped[bool] = mapped_column(Boolean, default=True)
    datetime_aware: Mapped[bool] = mapped_column(Boolean, default=True)
    system_text: Mapped[str | None] = mapped_column(Text, nullable=True)
    tools: Mapped[list[ToolInfo] | None] = mapped_column(
        postgresql.JSONB(), nullable=True
    )
    hint_text: Mapped[str | None] = mapped_column(Text, nullable=True)
    # Default personas are configured via backend during deployment
    # Treated specially (cannot be user edited etc.)
    default_persona: Mapped[bool] = mapped_column(Boolean, default=False)
    # If it's updated and no longer latest (should no longer be shown), it is also considered deleted
    deleted: Mapped[bool] = mapped_column(Boolean, default=False)

    document_sets: Mapped[list[DocumentSet]] = relationship(
        "DocumentSet",
        secondary=Persona__DocumentSet.__table__,
        back_populates="personas",
    )

    # Default personas loaded via yaml cannot have the same name
    __table_args__ = (
        Index(
            "_default_persona_name_idx",
            "name",
            unique=True,
            postgresql_where=(default_persona == True),  # noqa: E712
        ),
    )


class ChatMessage(Base):
    __tablename__ = "chat_message"

    chat_session_id: Mapped[int] = mapped_column(
        ForeignKey("chat_session.id"), primary_key=True
    )
    message_number: Mapped[int] = mapped_column(Integer, primary_key=True)
    edit_number: Mapped[int] = mapped_column(Integer, default=0, primary_key=True)
    parent_edit_number: Mapped[int | None] = mapped_column(
        Integer, nullable=True
    )  # null if first message
    latest: Mapped[bool] = mapped_column(Boolean, default=True)
    message: Mapped[str] = mapped_column(Text)
    token_count: Mapped[int] = mapped_column(Integer)
    message_type: Mapped[MessageType] = mapped_column(Enum(MessageType))
    reference_docs: Mapped[dict[str, Any] | None] = mapped_column(
        postgresql.JSONB(), nullable=True
    )
    persona_id: Mapped[int | None] = mapped_column(
        ForeignKey("persona.id"), nullable=True
    )
    time_sent: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )

    chat_session: Mapped[ChatSession] = relationship("ChatSession")
    persona: Mapped[Persona | None] = relationship("Persona")


class ChatMessageFeedback(Base):
    __tablename__ = "chat_feedback"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    chat_message_chat_session_id: Mapped[int] = mapped_column(Integer)
    chat_message_message_number: Mapped[int] = mapped_column(Integer)
    chat_message_edit_number: Mapped[int] = mapped_column(Integer)
    is_positive: Mapped[bool | None] = mapped_column(Boolean, nullable=True)
    feedback_text: Mapped[str | None] = mapped_column(Text, nullable=True)

    __table_args__ = (
        ForeignKeyConstraint(
            [
                "chat_message_chat_session_id",
                "chat_message_message_number",
                "chat_message_edit_number",
            ],
            [
                "chat_message.chat_session_id",
                "chat_message.message_number",
                "chat_message.edit_number",
            ],
        ),
    )

    chat_message: Mapped[ChatMessage] = relationship(
        "ChatMessage",
        foreign_keys=[
            chat_message_chat_session_id,
            chat_message_message_number,
            chat_message_edit_number,
        ],
        backref="feedbacks",
    )


AllowedAnswerFilters = (
    Literal["well_answered_postfilter"] | Literal["questionmark_prefilter"]
)


class ChannelConfig(TypedDict):
    """NOTE: is a `TypedDict` so it can be used a type hint for a JSONB column
    in Postgres"""

    channel_names: list[str]
    respond_tag_only: NotRequired[bool]  # defaults to False
    respond_team_member_list: NotRequired[list[str]]
    answer_filters: NotRequired[list[AllowedAnswerFilters]]


class SlackBotConfig(Base):
    __tablename__ = "slack_bot_config"

    id: Mapped[int] = mapped_column(primary_key=True)
    persona_id: Mapped[int | None] = mapped_column(
        ForeignKey("persona.id"), nullable=True
    )
    # JSON for flexibility. Contains things like: channel name, team members, etc.
    channel_config: Mapped[ChannelConfig] = mapped_column(
        postgresql.JSONB(), nullable=False
    )

    persona: Mapped[Persona | None] = relationship("Persona")


class TaskQueueState(Base):
    # Currently refers to Celery Tasks
    __tablename__ = "task_queue_jobs"

    id: Mapped[int] = mapped_column(primary_key=True)
    # Celery task id
    task_id: Mapped[str] = mapped_column(String)
    # For any job type, this would be the same
    task_name: Mapped[str] = mapped_column(String)
    # Note that if the task dies, this won't necessarily be marked FAILED correctly
    status: Mapped[TaskStatus] = mapped_column(Enum(TaskStatus))
    start_time: Mapped[datetime.datetime | None] = mapped_column(
        DateTime(timezone=True)
    )
    register_time: Mapped[datetime.datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )