from fastapi import APIRouter, HTTPException, UploadFile, File
from app.schemas.models import VideoFrameRequest, CardInfoOutput, CardInfoInput
from app.services.llm_service import LLMService
from app.services.video_service import VideoService
from typing import List
import logging

# 获取 logger 实例（如果 routes 也要打印日志的话）
logger = logging.getLogger("API")

router = APIRouter()
llm_service = LLMService()
video_service = VideoService()


# --- 接口 1: 文本总结 (改为文件上传) ---
@router.post("/summarize", response_model=List[CardInfoInput])
async def summarize_text(file: UploadFile = File(...)):
    """
    上传 txt 文件，返回提取的卡片信息 JSON 列表
    """
    # 1. 基本校验：检查文件名或扩展名
    if not file.filename.endswith(".txt"):
        raise HTTPException(status_code=400, detail="Only .txt files are allowed")

    try:
        # 2. 读取文件内容
        # file.read() 返回的是 bytes，需要解码
        content_bytes = await file.read()

        # 尝试解码 (优先 UTF-8，兼容 Windows 的 GBK)
        try:
            text = content_bytes.decode("utf-8")
        except UnicodeDecodeError:
            # 如果 utf-8 失败，尝试 gbk (常见于 Windows 记事本)
            try:
                text = content_bytes.decode("gbk")
            except UnicodeDecodeError:
                raise HTTPException(status_code=400, detail="File encoding not supported. Please use UTF-8.")

        if not text.strip():
            raise HTTPException(status_code=400, detail="File is empty")

        logger.info(f"📂 接收到文件: {file.filename}, 大小: {len(content_bytes)} bytes")

        # 3. 调用服务层处理
        results = llm_service.process_text(text)
        return results

    except Exception as e:
        logger.error(f"❌ 处理文件上传时出错: {e}")
        raise HTTPException(status_code=500, detail=str(e))


# --- 接口 2: 截取视频帧---
@router.post("/capture-frames", response_model=List[CardInfoOutput])
def capture_video_frames(request: VideoFrameRequest):
    try:
        result = video_service.capture_frames(request.video_path, request.cards)
        return result
    except FileNotFoundError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))