from datetime import date, datetime

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

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


class GeneratedResource(Base, TimestampMixin, SoftDeleteMixin):
    """统一生成资源账本。

    只记录生成成功后的图片/视频资源，不直接绑定具体业务外键，
    通过 source_model + source_id 兼容 ChatGenerationTask、GenerationRecord 以及后续新模块。
    """

    __tablename__ = "generated_resources"

    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
    )

    resource_type: Mapped[str] = mapped_column(String(16), index=True, nullable=False)  # image / video
    resource_url: Mapped[str] = mapped_column(Text, nullable=False)
    remote_url: Mapped[str | None] = mapped_column(Text, nullable=True)
    storage_type: Mapped[str] = mapped_column(String(32), default="local", nullable=False)
    storage_path: Mapped[str | None] = mapped_column(Text, nullable=True)
    file_name: Mapped[str | None] = mapped_column(String(255), nullable=True,comment="文件名,平台素材名称")
    file_size_bytes: Mapped[int] = mapped_column(BigInteger, default=0, nullable=False)

    source_model: Mapped[str] = mapped_column(String(64), index=True, nullable=False)
    source_model_module: Mapped[str | None] = mapped_column(String(255), nullable=True)
    source_id: Mapped[str] = mapped_column(String(32), index=True, nullable=False)

    engine_id: Mapped[str | None] = mapped_column(String(32), nullable=True, index=True)
    engine_type: Mapped[str | None] = mapped_column(String(32), nullable=True)
    provider: Mapped[str | None] = mapped_column(String(64), nullable=True)
    model_name: Mapped[str | None] = mapped_column(String(128), nullable=True)

    generated_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    resource_month: Mapped[date] = mapped_column(Date, index=True, nullable=False)
    extra_json: Mapped[str | None] = mapped_column(Text, nullable=True)


Index("ix_generated_resources_user_month", GeneratedResource.user_id, GeneratedResource.resource_month)
Index("ix_generated_resources_source", GeneratedResource.source_model, GeneratedResource.source_id)
Index("ix_generated_resources_active_user", GeneratedResource.user_id, GeneratedResource.deleted_at)