"""独立的从素材创建片段端点（不依赖 template_id 路径参数）.

POST /api/v1/clips/from-assets
- 与 /api/v1/templates/{template_id}/editor/clips/from-assets 功能一致
- 区别：template_id 从 body 传入（可选），为空时后端自动创建/查找默认模板
- 解决前端首次加载时 templateId 为空导致双斜杠 404 的问题（P0 #1922）
- 内部复用 resolve_draft_plan_id 和 create_clips_from_assets_editor 的核心逻辑
"""

from __future__ import annotations

import logging

from app.auth import AuthenticatedUser, get_current_user
from app.dependencies import get_asset_repository, get_db_session
from app.services.edit_plan_service import EditPlanService
from app.services.edit_template_service import EditTemplateService
from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException, status
from sqlalchemy.orm import Session

from packages.adapters.sqlalchemy_impl.asset_repository import SQLAlchemyAssetRepository

from ._default_template import get_or_create_default_template_id
from .templates_editor.clips import create_clips_from_assets_editor
from .templates_editor.dependencies import resolve_draft_plan_id
from .templates_editor.schemas import ClipsFromAssetsRequest, ClipsFromAssetsResponse

logger = logging.getLogger(__name__)
router = APIRouter(tags=["Clips"])


class StandaloneClipsRequest(ClipsFromAssetsRequest):
    """扩展请求：template_id 可选（不传则后端自动兜底默认模板）。"""

    template_id: str | None = None


def _get_editor_services_direct(db: Session) -> tuple[EditTemplateService, EditPlanService]:
    """直接构造服务实例（非 Depends 版本，供独立端点内部调用）。"""
    return EditTemplateService(db), EditPlanService(db)


@router.post("/clips/from-assets", response_model=ClipsFromAssetsResponse)
def create_clips_from_assets(
    body: StandaloneClipsRequest,
    background_tasks: BackgroundTasks,
    db: Session = Depends(get_db_session),
    current_user: AuthenticatedUser = Depends(get_current_user),
    asset_repo: SQLAlchemyAssetRepository = Depends(get_asset_repository),
) -> ClipsFromAssetsResponse:
    """从素材批量创建片段（template_id 可选，为空自动兜底）。"""
    user_id = str(current_user.user.id)
    services = _get_editor_services_direct(db)

    # 1. 解析/兜底 template_id，拿到 plan_id
    template_id = (body.template_id or "").strip()
    if not template_id:
        template_id = get_or_create_default_template_id(db, user_id)
        if not template_id:
            raise HTTPException(
                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
                detail="无法自动创建默认模板，请刷新页面重试",
            )
    plan_id = resolve_draft_plan_id(
        template_id=template_id,
        services=services,
        current_user=current_user,
        db=db,
        auto_create_default=False,  # 上面已兜底过
    )

    # 2. 构造标准化请求（去除独立端扩展字段），复用原端点核心逻辑
    core_body = ClipsFromAssetsRequest(
        asset_ids=body.asset_ids,
        clip_type=body.clip_type,
        clip_count=body.clip_count,
        required_clips_count=body.required_clips_count,
    )

    # 3. 直接调用原端点函数（此时所有 Depends 依赖已手动传入）
    return create_clips_from_assets_editor(
        template_id=template_id,
        body=core_body,
        background_tasks=background_tasks,
        plan_id=plan_id,
        services=services,
        asset_repo=asset_repo,
        db=db,
        current_user=current_user,
    )