from __future__ import annotations

from datetime import datetime

from sqlalchemy import DateTime, Float, ForeignKey, Index, Integer, String, Text, text
from sqlalchemy.orm import Mapped, mapped_column

from app.enums.private_portrait import (
    PrivatePortraitAssetStatus,
    PrivatePortraitAssetType,
    PrivatePortraitRemoteDeleteStatus,
)
from app.models.base import Base, SoftDeleteMixin, TimestampMixin


class VpV3Asset(Base, TimestampMixin, SoftDeleteMixin):
    """API V3 虚拟素材（图片/视频），归属某个 Project（=火山 1 个 AssetGroup）。

    字段语义和 private_portrait.PrivatePortraitAsset 保持一致，便于 service 层复用逻辑。
    """

    __tablename__ = "vp_v3_assets"
    __table_args__ = (
        Index("uq_vp_v3_assets_remote_asset_id", "remote_asset_id", unique=True),
        Index("idx_vp_v3_assets_key_status_created", "api_key_id", "status", "created_at"),
        Index("idx_vp_v3_assets_project_status_created", "project_id", "status", "created_at"),
        Index(
            "idx_vp_v3_assets_next_poll_status",
            "next_poll_at",
            "status",
            postgresql_where=text("deleted_at IS NULL AND next_poll_at IS NOT NULL"),
        ),
        Index("idx_vp_v3_assets_remote_delete_status", "remote_delete_status"),
        Index("idx_vp_v3_assets_asset_type", "asset_type"),
    )

    id: Mapped[str] = mapped_column(String(32), primary_key=True)
    api_key_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("api_keys.id", ondelete="CASCADE"), nullable=False, index=True,
    )
    project_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("vp_v3_projects.id", ondelete="CASCADE"), nullable=False, index=True,
    )

    # 火山远端映射
    remote_project_name: Mapped[str] = mapped_column(String(256), nullable=False, index=True)
    remote_group_id: Mapped[str] = mapped_column(String(128), nullable=False, index=True)
    remote_asset_id: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)

    # 素材元信息
    asset_type: Mapped[str] = mapped_column(
        String(16), nullable=False, default=PrivatePortraitAssetType.IMAGE.value, index=True,
        comment="素材类型：Image=图片 / Video=视频",
    )
    name: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)

    # 资源 URL
    source_url: Mapped[str] = mapped_column(Text, nullable=False, comment="本地上传后的访问 URL（UploadResource 返回的）")
    preview_url: Mapped[str | None] = mapped_column(Text, nullable=True, comment="给前端预览/显示用的 URL（签名 URL 可能过期）")
    remote_url: Mapped[str | None] = mapped_column(Text, nullable=True, comment="火山返回的资源访问 URL（可能带签名和过期）")
    remote_url_expired_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    upload_resource_id: Mapped[str | None] = mapped_column(
        String(32), nullable=True, index=True, comment="本地 UploadResource 账本 resource_id（容量释放用）",
    )
    video_duration: Mapped[float | None] = mapped_column(Float, nullable=True, comment="视频时长，秒")
    video_cover_url: Mapped[str | None] = mapped_column(Text, nullable=True, comment="视频封面预览")
    file_size_bytes: Mapped[int | None] = mapped_column(Integer, nullable=True, comment="素材文件大小，字节")
    mime_type: Mapped[str | None] = mapped_column(String(128), nullable=True)

    status: Mapped[str] = mapped_column(
        String(32), nullable=False,
        default=PrivatePortraitAssetStatus.CREATING.value,
        server_default=PrivatePortraitAssetStatus.CREATING.value,
        index=True,
        comment="素材状态：creating/审核中 active/可用 failed/失败 deleting/删除中",
    )
    moderation_json: Mapped[str | None] = mapped_column(Text, nullable=True, comment="火山审核结果 JSON")
    error_message: Mapped[str | None] = mapped_column(Text, nullable=True, comment="失败原因")
    raw_response_json: Mapped[str | None] = mapped_column(Text, nullable=True, comment="火山原始响应 JSON")

    # 轮询控制（异步审核）
    last_poll_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    next_poll_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    poll_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0, server_default="0")

    # 远端删除
    remote_delete_status: Mapped[str] = mapped_column(
        String(32), nullable=False,
        default=PrivatePortraitRemoteDeleteStatus.NONE.value,
        server_default=PrivatePortraitRemoteDeleteStatus.NONE.value,
        index=True,
    )
    remote_deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    remote_delete_error: Mapped[str | None] = mapped_column(Text, nullable=True)