"""匿名接口，统一放在 /api/public 下，一眼能看出哪些不鉴权"""

from typing import Any

from fastapi import APIRouter
from fastapi.responses import FileResponse

from app.api.screens import Service
from app.common.response import ApiResponse, success_response
from app.core.exceptions import BizException
from app.schemas.saved_screen import PublicScreen
from app.services.screens import public_page

router = APIRouter(prefix="/public", tags=["Public"])


@router.get("/screens/{share_id}")
async def get_public_screen(
    share_id: str, service: Service
) -> ApiResponse[PublicScreen]:
    """线上版本：返回发布快照，不是草稿；已下线、已删除、不存在都是 404"""
    summary, snapshot = await service.get_live(share_id)
    return success_response(
        PublicScreen(
            name=summary.name,
            page=public_page(snapshot.page),
            version=snapshot.version,
            published_at=snapshot.published_at,
        )
    )


@router.get("/screens/{share_id}/datasources/{datasource_id}")
async def fetch_public_datasource(
    share_id: str, datasource_id: str, service: Service
) -> ApiResponse[dict[str, Any] | list[Any]]:
    """线上取数：地址取自已发布快照里的数据源配置，前端只传 ID"""
    return success_response(
        await service.fetch_live_datasource(share_id, datasource_id)
    )


@router.get("/thumbnails/{thumbnail_id}")
async def get_thumbnail(thumbnail_id: str, service: Service) -> FileResponse:
    opened = service.open_thumbnail(thumbnail_id)
    if opened is None:
        raise BizException(404, "封面不存在")
    path, media_type = opened
    # 每次上传都换新 ID，内容永远不变，可以放心长期缓存
    return FileResponse(
        path,
        media_type=media_type,
        headers={"Cache-Control": "public, max-age=31536000, immutable"},
    )