"""Folder and File models for the DMS plugin."""

from __future__ import annotations

import uuid
from datetime import datetime
from typing import Any

from pgvector.sqlalchemy import Vector
from sqlalchemy import DateTime, ForeignKey, Index, Integer, String, Text, UniqueConstraint
from sqlalchemy.dialects.postgresql import TSVECTOR
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base, TenantMixin
from app.models.owned_mixin import OwnedMixin


class Folder(Base, TenantMixin, OwnedMixin):
    """Folder entity — hierarchical, tenant-scoped, soft-deletable."""

    __tablename__ = "folders"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "name",
            "parent_id",
            name="uq_folders_tenant_name_parent",
            # Partial uniqueness only for non-deleted folders is handled at app level
        ),
        Index("ix_folders_parent", "parent_id"),
        Index("ix_folders_tenant", "tenant_id"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    parent_id: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("folders.id", ondelete="CASCADE"),
        nullable=True,
    )
    created_by: Mapped[uuid.UUID] = mapped_column(PGUUID(as_uuid=True), nullable=False)
    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)


class File(Base, TenantMixin, OwnedMixin):
    """File entity — stored on disk, tenant-scoped, soft-deletable."""

    __tablename__ = "files"
    indexed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    content_tsv: Mapped[Any] = mapped_column(TSVECTOR, nullable=True)
    content_text: Mapped[str | None] = mapped_column(Text, nullable=True)
    embedding: Mapped[Any] = mapped_column(Vector(768), nullable=True)
    __table_args__ = (
        Index("ix_files_folder", "folder_id"),
        Index("ix_files_tenant", "tenant_id"),
        Index("ix_files_name", "name"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    folder_id: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("folders.id", ondelete="SET NULL"),
        nullable=True,
    )
    uploaded_by: Mapped[uuid.UUID] = mapped_column(PGUUID(as_uuid=True), nullable=False)
    mime_type: Mapped[str] = mapped_column(String(255), nullable=False)
    size_bytes: Mapped[int] = mapped_column(Integer, nullable=False)
    storage_path: Mapped[str] = mapped_column(String(1024), nullable=False)
    content_hash: Mapped[str | None] = mapped_column(String(64), nullable=True)
    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)