from __future__ import annotations

from datetime import datetime

from sqlalchemy import BigInteger, DateTime, Float, ForeignKey, Index, String, Text, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column

from app.models.base import Base, SoftDeleteMixin, TimestampMixin


class UploadResource(Base, TimestampMixin, SoftDeleteMixin):
    """统一上传资源账本。

    记录用户直接上传、模块上传和拆镜切片文件，不建立 ORM relationship，
    通过 source_model + source_id 进行低耦合绑定。
    """

    __tablename__ = "upload_resources"
    __table_args__ = (
        UniqueConstraint("storage_path", name="uq_upload_resources_storage_path"),
        Index("ix_upload_resources_user_module_type", "user_id", "module", "resource_type", "deleted_at"),
        Index("ix_upload_resources_user_bind", "user_id", "bind_status", "deleted_at"),
        Index("ix_upload_resources_history_lookup", "user_id", "resource_type", "bind_status", "delete_policy", "deleted_at", "created_at"),
        Index("ix_upload_resources_source", "source_model", "source_id", "deleted_at"),
        Index("ix_upload_resources_url", "resource_url"),
        Index("ix_upload_resources_created", "created_at"),
        Index("ix_upload_resources_file_delete_status", "file_delete_status"),
        Index("ix_upload_resources_physical_deleted", "physical_deleted_at"),
    )

    id: Mapped[str] = mapped_column(String(32), primary_key=True)
    user_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("users.id", ondelete="CASCADE"), index=True, nullable=False
    )

    module: Mapped[str] = mapped_column(String(64), index=True, nullable=False)
    resource_type: Mapped[str] = mapped_column(String(32), index=True, nullable=False)

    resource_url: Mapped[str] = mapped_column(Text, nullable=False)
    storage_path: Mapped[str] = mapped_column(Text, nullable=False)
    file_name: Mapped[str | None] = mapped_column(String(255), nullable=True)
    file_ext: Mapped[str | None] = mapped_column(String(32), nullable=True)
    mime_type: Mapped[str | None] = mapped_column(String(128), nullable=True)
    file_size_bytes: Mapped[int] = mapped_column(BigInteger, default=0, server_default="0", nullable=False)

    duration_seconds: Mapped[float | None] = mapped_column(Float, nullable=True)
    duration_source: Mapped[str | None] = mapped_column(String(32), nullable=True)
    width: Mapped[int | None] = mapped_column(BigInteger, nullable=True)
    height: Mapped[int | None] = mapped_column(BigInteger, nullable=True)

    source_model: Mapped[str | None] = mapped_column(String(64), index=True, nullable=True)
    source_id: Mapped[str | None] = mapped_column(String(32), index=True, nullable=True)
    source_module: Mapped[str | None] = mapped_column(String(64), nullable=True)

    bind_status: Mapped[str] = mapped_column(String(32), default="pending", server_default="pending", index=True, nullable=False)
    delete_policy: Mapped[str] = mapped_column(String(32), default="user_deletable", server_default="user_deletable", index=True, nullable=False)
    created_by: Mapped[str] = mapped_column(String(32), default="api", server_default="api", index=True, nullable=False)

    metadata_json: Mapped[str | None] = mapped_column(Text, nullable=True)
    capacity_released_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)

    physical_deleted_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True),
        nullable=True,
    )

    file_delete_status: Mapped[str] = mapped_column(
        String(32),
        default="active",
        server_default="active",
        nullable=False,
    )

    file_delete_error: Mapped[str | None] = mapped_column(
        Text,
        nullable=True,
    )