from __future__ import annotations

import uuid
from datetime import datetime
from typing import Any

from sqlalchemy import (
    Boolean,
    DateTime,
    ForeignKey,
    Index,
    Integer,
    JSON,
    String,
    Text,
    UniqueConstraint,
)
from sqlalchemy.orm import Mapped, mapped_column, relationship

from govoplan_core.db.base import Base, TimestampMixin, utcnow


def new_uuid() -> str:
    return str(uuid.uuid4())


class SearchIndexDocument(Base, TimestampMixin):
    __tablename__ = "search_index_documents"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "module_id",
            "resource_type",
            "resource_id",
            name="uq_search_document_resource",
        ),
        Index(
            "ix_search_document_scope",
            "tenant_id",
            "module_id",
            "resource_type",
        ),
        Index("ix_search_document_visibility", "tenant_id", "visibility"),
        Index(
            "ix_search_document_provider",
            "tenant_id",
            "provider_id",
            "resource_type",
            "active",
        ),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_uuid)
    tenant_id: Mapped[str] = mapped_column(String(36), nullable=False, index=True)
    module_id: Mapped[str] = mapped_column(String(100), nullable=False, index=True)
    provider_id: Mapped[str] = mapped_column(
        String(200),
        nullable=False,
        index=True,
    )
    resource_type: Mapped[str] = mapped_column(
        String(100), nullable=False, index=True
    )
    resource_id: Mapped[str] = mapped_column(
        String(255), nullable=False, index=True
    )
    title: Mapped[str] = mapped_column(String(500), nullable=False)
    summary: Mapped[str | None] = mapped_column(Text, nullable=True)
    body: Mapped[str | None] = mapped_column(Text, nullable=True)
    keywords: Mapped[list[str]] = mapped_column(JSON, default=list, nullable=False)
    search_text: Mapped[str] = mapped_column(Text, nullable=False)
    url: Mapped[str] = mapped_column(String(1500), nullable=False)
    visibility: Mapped[str] = mapped_column(
        String(20), default="restricted", nullable=False
    )
    external_reference: Mapped[dict[str, Any] | None] = mapped_column(
        JSON, nullable=True
    )
    metadata_: Mapped[dict[str, Any]] = mapped_column(
        "metadata", JSON, default=dict, nullable=False
    )
    content_hash: Mapped[str] = mapped_column(String(64), nullable=False)
    source_revision: Mapped[str] = mapped_column(
        String(255),
        nullable=False,
    )
    change_cursor: Mapped[str | None] = mapped_column(
        String(500),
        nullable=True,
    )
    source_updated_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True),
        nullable=True,
    )
    language: Mapped[str] = mapped_column(
        String(32),
        default="simple",
        nullable=False,
    )
    index_version: Mapped[int] = mapped_column(
        Integer,
        default=1,
        nullable=False,
    )
    requires_authorization_recheck: Mapped[bool] = mapped_column(
        Boolean,
        default=False,
        nullable=False,
    )
    rebuild_id: Mapped[str | None] = mapped_column(
        String(36),
        nullable=True,
        index=True,
    )
    active: Mapped[bool] = mapped_column(
        Boolean,
        default=True,
        nullable=False,
        index=True,
    )
    indexed_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False
    )

    acl_tokens: Mapped[list["SearchIndexAclToken"]] = relationship(
        back_populates="document",
        cascade="all, delete-orphan",
    )


class SearchIndexAclToken(Base):
    __tablename__ = "search_index_acl_tokens"
    __table_args__ = (
        UniqueConstraint(
            "document_id",
            "token",
            name="uq_search_index_acl_document_token",
        ),
        Index("ix_search_index_acl_token", "token", "document_id"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_uuid)
    document_id: Mapped[str] = mapped_column(
        ForeignKey("search_index_documents.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    token: Mapped[str] = mapped_column(String(500), nullable=False, index=True)

    document: Mapped[SearchIndexDocument] = relationship(
        back_populates="acl_tokens"
    )


class SearchIndexState(Base, TimestampMixin):
    __tablename__ = "search_index_states"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "provider_id",
            "resource_type",
            name="uq_search_index_state_source",
        ),
        Index(
            "ix_search_index_state_status",
            "tenant_id",
            "status",
        ),
    )

    id: Mapped[str] = mapped_column(
        String(36),
        primary_key=True,
        default=new_uuid,
    )
    tenant_id: Mapped[str] = mapped_column(
        String(36),
        nullable=False,
        index=True,
    )
    provider_id: Mapped[str] = mapped_column(
        String(200),
        nullable=False,
        index=True,
    )
    module_id: Mapped[str] = mapped_column(
        String(100),
        nullable=False,
        index=True,
    )
    resource_type: Mapped[str] = mapped_column(
        String(100),
        nullable=False,
        index=True,
    )
    index_version: Mapped[int] = mapped_column(
        Integer,
        default=1,
        nullable=False,
    )
    status: Mapped[str] = mapped_column(
        String(30),
        default="idle",
        nullable=False,
        index=True,
    )
    rebuild_id: Mapped[str | None] = mapped_column(
        String(36),
        nullable=True,
    )
    checkpoint_cursor: Mapped[str | None] = mapped_column(
        String(500),
        nullable=True,
    )
    high_watermark: Mapped[str | None] = mapped_column(
        String(500),
        nullable=True,
    )
    last_change_cursor: Mapped[str | None] = mapped_column(
        String(500),
        nullable=True,
    )
    indexed_documents: Mapped[int] = mapped_column(
        Integer,
        default=0,
        nullable=False,
    )
    rejected_documents: Mapped[int] = mapped_column(
        Integer,
        default=0,
        nullable=False,
    )
    rebuild_started_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True),
        nullable=True,
    )
    rebuild_completed_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True),
        nullable=True,
    )
    last_success_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True),
        nullable=True,
    )
    last_error: Mapped[str | None] = mapped_column(Text, nullable=True)


class SearchIndexChangeQueue(Base, TimestampMixin):
    __tablename__ = "search_index_change_queue"
    __table_args__ = (
        UniqueConstraint(
            "change_id",
            name="uq_search_index_change_queue_change",
        ),
        Index(
            "ix_search_index_change_queue_pending",
            "status",
            "available_at",
            "created_at",
        ),
        Index(
            "ix_search_index_change_queue_source",
            "tenant_id",
            "provider_id",
            "resource_type",
        ),
    )

    id: Mapped[str] = mapped_column(
        String(36),
        primary_key=True,
        default=new_uuid,
    )
    change_id: Mapped[str] = mapped_column(
        String(255),
        nullable=False,
        index=True,
    )
    tenant_id: Mapped[str] = mapped_column(
        String(36),
        nullable=False,
        index=True,
    )
    provider_id: Mapped[str] = mapped_column(
        String(200),
        nullable=False,
        index=True,
    )
    module_id: Mapped[str] = mapped_column(
        String(100),
        nullable=False,
        index=True,
    )
    resource_type: Mapped[str] = mapped_column(
        String(100),
        nullable=False,
        index=True,
    )
    resource_id: Mapped[str] = mapped_column(
        String(255),
        nullable=False,
        index=True,
    )
    kind: Mapped[str] = mapped_column(
        String(20),
        nullable=False,
    )
    source_revision: Mapped[str] = mapped_column(
        String(255),
        nullable=False,
    )
    source_cursor: Mapped[str] = mapped_column(
        String(500),
        nullable=False,
    )
    document_: Mapped[dict[str, Any] | None] = mapped_column(
        "document",
        JSON,
        nullable=True,
    )
    occurred_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True),
        nullable=True,
    )
    status: Mapped[str] = mapped_column(
        String(30),
        default="queued",
        nullable=False,
        index=True,
    )
    attempts: Mapped[int] = mapped_column(
        Integer,
        default=0,
        nullable=False,
    )
    available_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=utcnow,
        nullable=False,
        index=True,
    )
    processed_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True),
        nullable=True,
    )
    error: Mapped[str | None] = mapped_column(Text, nullable=True)


__all__ = [
    "SearchIndexAclToken",
    "SearchIndexChangeQueue",
    "SearchIndexDocument",
    "SearchIndexState",
    "new_uuid",
]