"""Admin media library API - list & upload images (session-authenticated)."""
import os
import uuid
from pathlib import Path

from fastapi import APIRouter, HTTPException, Request, UploadFile
from fastapi.responses import JSONResponse

from app.core.config import settings

router = APIRouter(prefix="/admin/api/media", tags=["admin-media"])

ALLOWED_EXTENSIONS = {".jpg", ".jpeg", ".png", ".gif", ".webp"}
MAX_SIZE = 10 * 1024 * 1024


def _check_admin_session(request: Request):
    uid = request.session.get("admin_user_id")
    if not uid:
        raise HTTPException(status_code=401, detail="未登录")


@router.get("/list")
async def list_media(request: Request):
    _check_admin_session(request)

    images = []

    if settings.STORAGE_BACKEND == "local":
        upload_dir = Path(settings.LOCAL_STORAGE_PATH)
        if upload_dir.exists():
            for f in sorted(upload_dir.iterdir(), key=lambda p: p.stat().st_mtime, reverse=True):
                if f.is_file() and f.suffix.lower() in ALLOWED_EXTENSIONS:
                    images.append({
                        "url": f"/uploads/{f.name}",
                        "name": f.name,
                        "size": f.stat().st_size,
                    })
    else:
        storage = request.app.state.storage
        try:
            resp = storage.client.list_objects_v2(Bucket=storage.bucket, Prefix="images/", MaxKeys=200)
            for obj in resp.get("Contents", []):
                key = obj["Key"]
                ext = Path(key).suffix.lower()
                if ext in ALLOWED_EXTENSIONS:
                    images.append({
                        "url": storage._get_url(key),
                        "name": Path(key).name,
                        "size": obj.get("Size", 0),
                    })
        except Exception:
            pass

    return JSONResponse({"images": images})


@router.post("/upload")
async def upload_media(request: Request, file: UploadFile):
    _check_admin_session(request)

    if not file.filename:
        raise HTTPException(status_code=400, detail="缺少文件")

    ext = Path(file.filename).suffix.lower()
    if ext not in ALLOWED_EXTENSIONS:
        raise HTTPException(status_code=400, detail=f"不支持的文件类型: {ext}")

    data = await file.read()
    if len(data) > MAX_SIZE:
        raise HTTPException(status_code=413, detail="文件过大，最大10MB")

    storage = request.app.state.storage
    url = storage.upload(data, file.filename, file.content_type or "")

    return JSONResponse({"url": url, "name": file.filename})