from __future__ import annotations

from copy import deepcopy
from typing import Any

from fastapi import HTTPException
from sqlalchemy import or_, select
from sqlalchemy.ext.asyncio import AsyncSession

from app.enums.private_portrait import (
    PRIVATE_PORTRAIT_ASSET_URI_PREFIX,
    PrivatePortraitAssetStatus,
    PRIVATE_PORTRAIT_ENABLED_ASSET_TYPES,
    PrivatePortraitAssetType,
    PrivatePortraitEventSource,
    PrivatePortraitEventStatus,
    PrivatePortraitEventType,
    PrivatePortraitReferenceSource,
)
from app.models.private_portrait import PrivatePortraitAsset
from app.services.operation_log_service import log_operation_error, log_operation_event

DOMAIN = "private_portrait"


_ASSET_TYPE_TO_REFERENCE_TYPE = {
    PrivatePortraitAssetType.IMAGE.value: "image",
    PrivatePortraitAssetType.VIDEO.value: "video",
}


_SUPPORTED_GEN_TYPES = {"image", "video"}


def _ref_get(ref: Any, key: str) -> Any:
    if isinstance(ref, dict):
        return ref.get(key)
    return getattr(ref, key, None)


def _ref_set(ref: Any, key: str, value: Any) -> None:
    if isinstance(ref, dict):
        ref[key] = value
    else:
        setattr(ref, key, value)


def _normalize_gen_type(gen_type: str | None) -> str | None:
    value = (gen_type or "").strip().lower()
    if not value:
        return None
    if value not in _SUPPORTED_GEN_TYPES:
        raise HTTPException(status_code=400, detail="gen_type 仅支持 image 或 video")
    return value


def _normalize_ref_type(value: Any) -> str:
    return str(value or "").strip().lower()


def _remote_asset_id_from_asset_uri(url: Any) -> str | None:
    value = str(url or "").strip()
    if not value.startswith(PRIVATE_PORTRAIT_ASSET_URI_PREFIX):
        return None
    remote_asset_id = value[len(PRIVATE_PORTRAIT_ASSET_URI_PREFIX):].strip()
    return remote_asset_id or None


def _asset_display_url(asset: PrivatePortraitAsset) -> str | None:
    # preview_url 是本地上传预览，remote_url 是火山 GetAsset 返回的远程资源 URL；source_url 是兜底公网上传地址。
    return asset.preview_url or asset.remote_url or asset.source_url or None


def _fill_private_portrait_reference_display_fields(ref: Any, asset: PrivatePortraitAsset) -> None:
    provider_url = str(_ref_get(ref, "provider_url") or _ref_get(ref, "url") or "").strip()
    if provider_url.startswith(PRIVATE_PORTRAIT_ASSET_URI_PREFIX):
        _ref_set(ref, "provider_url", provider_url)

    display_url = _asset_display_url(asset)
    if display_url:
        # 返回给前端的 url 必须可预览；供应商专用 asset:// 保留到 provider_url，避免管理后台和客户端展示黑图。
        _ref_set(ref, "url", display_url)
        _ref_set(ref, "display_url", display_url)
        _ref_set(ref, "preview_url", display_url)

    _ref_set(ref, "source", PrivatePortraitReferenceSource.PRIVATE_PORTRAIT_ASSET.value)
    _ref_set(ref, "private_asset_id", asset.id)
    if asset.remote_asset_id:
        _ref_set(ref, "remote_asset_id", asset.remote_asset_id)
    expected_ref_type = _ASSET_TYPE_TO_REFERENCE_TYPE.get(asset.asset_type)
    if expected_ref_type:
        _ref_set(ref, "type", expected_ref_type)
    if asset.asset_type == PrivatePortraitAssetType.VIDEO.value and asset.video_duration is not None:
        _ref_set(ref, "duration", asset.video_duration)
    if not _ref_get(ref, "name") and asset.name:
        _ref_set(ref, "name", asset.name)


async def resolve_private_portrait_reference_display_urls(
    db: AsyncSession,
    media_references: list[Any] | None,
    *,
    user_id: str | None = None,
) -> list[Any] | None:
    """把历史响应里的 asset:// 引用补成前端可预览 URL。

    生成任务入库时 url 使用 asset://remote_asset_id 传给供应商；但客户端/管理后台展示不能直接用
    asset://。这里批量根据 private_asset_id 或 asset://remote_asset_id 查本地素材，并把响应中的 url
    改成 preview_url/remote_url/source_url，同时保留 provider_url=asset://... 供排查。
    """
    if not media_references:
        return media_references

    refs = deepcopy(media_references)
    private_asset_ids: list[str] = []
    remote_asset_ids: list[str] = []
    for ref in refs:
        source = _ref_get(ref, "source")
        private_asset_id = _ref_get(ref, "private_asset_id")
        remote_asset_id = _ref_get(ref, "remote_asset_id") or _remote_asset_id_from_asset_uri(_ref_get(ref, "url"))
        if source == PrivatePortraitReferenceSource.PRIVATE_PORTRAIT_ASSET.value or remote_asset_id:
            if private_asset_id:
                private_asset_ids.append(str(private_asset_id))
            if remote_asset_id:
                remote_asset_ids.append(str(remote_asset_id))

    private_asset_ids = list(dict.fromkeys(private_asset_ids))
    remote_asset_ids = list(dict.fromkeys(remote_asset_ids))
    if not private_asset_ids and not remote_asset_ids:
        return refs

    filters = []
    if private_asset_ids:
        filters.append(PrivatePortraitAsset.id.in_(private_asset_ids))
    if remote_asset_ids:
        filters.append(PrivatePortraitAsset.remote_asset_id.in_(remote_asset_ids))

    stmt = select(PrivatePortraitAsset).where(or_(*filters))
    if user_id is not None:
        stmt = stmt.where(PrivatePortraitAsset.user_id == user_id)
    rows = await db.execute(stmt)
    assets = list(rows.scalars().all())
    by_id = {asset.id: asset for asset in assets}
    by_remote_id = {asset.remote_asset_id: asset for asset in assets if asset.remote_asset_id}

    for ref in refs:
        private_asset_id = str(_ref_get(ref, "private_asset_id") or "").strip()
        remote_asset_id = str(_ref_get(ref, "remote_asset_id") or _remote_asset_id_from_asset_uri(_ref_get(ref, "url")) or "").strip()
        asset = by_id.get(private_asset_id) or by_remote_id.get(remote_asset_id)
        if not asset:
            continue
        _fill_private_portrait_reference_display_fields(ref, asset)

    return refs


async def batch_resolve_private_portrait_reference_display_urls(
    db: AsyncSession,
    references_by_key: dict[Any, list[Any] | None],
    *,
    user_id: str | None = None,
) -> dict[Any, list[Any] | None]:
    if not references_by_key:
        return {}

    copied: dict[Any, list[Any] | None] = {
        key: deepcopy(refs) if refs else refs
        for key, refs in references_by_key.items()
    }
    private_asset_ids: list[str] = []
    remote_asset_ids: list[str] = []

    for refs in copied.values():
        if not refs:
            continue
        for ref in refs:
            source = _ref_get(ref, "source")
            private_asset_id = _ref_get(ref, "private_asset_id")
            remote_asset_id = _ref_get(ref, "remote_asset_id") or _remote_asset_id_from_asset_uri(_ref_get(ref, "url"))
            if source == PrivatePortraitReferenceSource.PRIVATE_PORTRAIT_ASSET.value or remote_asset_id:
                if private_asset_id:
                    private_asset_ids.append(str(private_asset_id))
                if remote_asset_id:
                    remote_asset_ids.append(str(remote_asset_id))

    private_asset_ids = list(dict.fromkeys(private_asset_ids))
    remote_asset_ids = list(dict.fromkeys(remote_asset_ids))
    if not private_asset_ids and not remote_asset_ids:
        return copied

    filters = []
    if private_asset_ids:
        filters.append(PrivatePortraitAsset.id.in_(private_asset_ids))
    if remote_asset_ids:
        filters.append(PrivatePortraitAsset.remote_asset_id.in_(remote_asset_ids))

    stmt = select(PrivatePortraitAsset).where(or_(*filters))
    if user_id is not None:
        stmt = stmt.where(PrivatePortraitAsset.user_id == user_id)
    rows = await db.execute(stmt)
    assets = list(rows.scalars().all())
    by_id = {asset.id: asset for asset in assets}
    by_remote_id = {asset.remote_asset_id: asset for asset in assets if asset.remote_asset_id}

    for refs in copied.values():
        if not refs:
            continue
        for ref in refs:
            private_asset_id = str(_ref_get(ref, "private_asset_id") or "").strip()
            remote_asset_id = str(_ref_get(ref, "remote_asset_id") or _remote_asset_id_from_asset_uri(_ref_get(ref, "url")) or "").strip()
            asset = by_id.get(private_asset_id) or by_remote_id.get(remote_asset_id)
            if not asset:
                continue
            _fill_private_portrait_reference_display_fields(ref, asset)

    return copied


async def resolve_private_portrait_references(
    db: AsyncSession,
    *,
    user_id: str,
    media_references: list[Any] | None,
    gen_type: str | None = None,
) -> list[Any] | None:
    """Resolve private portrait references before dispatching a generation task.

    generation_ai_service.py 和 generation_task_factory_service.py 都会传 gen_type。
    这里保留该参数用于兼容调用方，并做基础校验，避免接口因函数签名不一致直接 500。
    """
    normalized_gen_type = _normalize_gen_type(gen_type)
    if not media_references:
        return media_references

    refs = deepcopy(media_references)
    ids = [
        str(_ref_get(ref, "private_asset_id"))
        for ref in refs
        if _ref_get(ref, "source") == PrivatePortraitReferenceSource.PRIVATE_PORTRAIT_ASSET.value
        and _ref_get(ref, "private_asset_id")
    ]
    ids = list(dict.fromkeys(ids))
    if not ids:
        return refs

    log_operation_event(
        domain=DOMAIN,
        event_type=PrivatePortraitEventType.REFERENCE_RESOLVE_START.value,
        event_status=PrivatePortraitEventStatus.PENDING.value,
        source=PrivatePortraitEventSource.SERVICE.value,
        user_id=user_id,
        detail={"private_asset_ids": ids, "gen_type": normalized_gen_type},
    )

    try:
        rows = await db.execute(select(PrivatePortraitAsset).where(PrivatePortraitAsset.id.in_(ids)))
        asset_map = {asset.id: asset for asset in rows.scalars().all()}

        for ref in refs:
            if _ref_get(ref, "source") != PrivatePortraitReferenceSource.PRIVATE_PORTRAIT_ASSET.value:
                continue

            asset_id = str(_ref_get(ref, "private_asset_id") or "")
            if not asset_id:
                raise HTTPException(status_code=400, detail="私域人像素材引用缺少 private_asset_id")

            asset = asset_map.get(asset_id)
            if not asset:
                raise HTTPException(status_code=400, detail="私域人像素材不存在")
            if asset.user_id != user_id:
                raise HTTPException(status_code=403, detail="私域人像素材不属于当前用户")
            if asset.deleted_at is not None:
                raise HTTPException(status_code=400, detail="私域人像素材已删除")
            if asset.asset_type not in PRIVATE_PORTRAIT_ENABLED_ASSET_TYPES:
                raise HTTPException(status_code=400, detail="Audio 暂未开放，当前仅支持 Image/Video 私域素材")
            if asset.status != PrivatePortraitAssetStatus.ACTIVE.value:
                raise HTTPException(status_code=400, detail=f"私域人像素材状态为 {asset.status}，Active 后才可用于生成")
            if not asset.remote_asset_id:
                raise HTTPException(status_code=400, detail="私域人像素材缺少远程 AssetId")

            expected_ref_type = _ASSET_TYPE_TO_REFERENCE_TYPE.get(asset.asset_type)
            ref_type = _normalize_ref_type(_ref_get(ref, "type"))
            if expected_ref_type and ref_type and ref_type != expected_ref_type:
                raise HTTPException(status_code=400, detail=f"私域人像素材类型不匹配：引用为 {ref_type}，素材为 {expected_ref_type}")

            provider_url = f"{PRIVATE_PORTRAIT_ASSET_URI_PREFIX}{asset.remote_asset_id}"
            _ref_set(ref, "source", PrivatePortraitReferenceSource.PRIVATE_PORTRAIT_ASSET.value)
            _ref_set(ref, "private_asset_id", asset.id)
            _ref_set(ref, "remote_asset_id", asset.remote_asset_id)
            _ref_set(ref, "url", provider_url)
            _ref_set(ref, "provider_url", provider_url)
            display_url = _asset_display_url(asset)
            if display_url:
                _ref_set(ref, "display_url", display_url)
                _ref_set(ref, "preview_url", display_url)
            if expected_ref_type:
                _ref_set(ref, "type", expected_ref_type)
            if asset.asset_type == PrivatePortraitAssetType.VIDEO.value:
                if asset.video_duration is None:
                    raise HTTPException(status_code=400, detail="私域视频素材缺少 video_duration，不能用于生成")
                _ref_set(ref, "duration", asset.video_duration)
            if not _ref_get(ref, "name") and asset.name:
                _ref_set(ref, "name", asset.name)

        log_operation_event(
            domain=DOMAIN,
            event_type=PrivatePortraitEventType.REFERENCE_RESOLVE_SUCCESS.value,
            event_status=PrivatePortraitEventStatus.SUCCESS.value,
            source=PrivatePortraitEventSource.SERVICE.value,
            user_id=user_id,
            detail={"count": len(ids), "gen_type": normalized_gen_type},
        )
        return refs
    except Exception as exc:
        log_operation_error(
            domain=DOMAIN,
            event_type=PrivatePortraitEventType.REFERENCE_RESOLVE_FAILED.value,
            source=PrivatePortraitEventSource.SERVICE.value,
            user_id=user_id,
            detail={"private_asset_ids": ids, "gen_type": normalized_gen_type},
            exc=exc,
        )
        raise