from fastapi import APIRouter, HTTPException
from fastapi.responses import FileResponse
import os
from setting import UPLOAD_DIR, OUTPUT_DIR

router = APIRouter(prefix="/api1/file", tags=["file"])

@router.get("/image/{filename}")
async def get_image(filename: str):
    # 1. 构建完整路径
    file_path = os.path.join(UPLOAD_DIR, filename)
    return get_file(file_path)
    #
    # # 2. 安全检查：防止目录穿越漏洞 (Directory Traversal)
    # # 确保用户请求的文件确实在 UPLOAD_DIR 目录下
    # real_path = os.path.realpath(file_path)
    # if not real_path.startswith(os.path.realpath(UPLOAD_DIR)):
    #     raise HTTPException(status_code=403, detail="拒绝访问该路径")
    #
    # # 3. 检查文件是否存在
    # if not os.path.exists(real_path):
    #     raise HTTPException(status_code=404, detail="图片不存在")
    #
    # # 4. 返回文件流
    # # media_type 会根据后缀自动识别（如 image/jpeg），也可以手动指定
    # return FileResponse(real_path)


@router.get("/audio/{filename}")
async def get_audio(filename: str):
    # 1. 构建完整路径
    file_path = os.path.join(UPLOAD_DIR, filename)
    return get_file(file_path)


@router.get("/video/{filename}")
async def get_video(filename: str):
    # 1. 构建完整路径
    file_path = os.path.join(OUTPUT_DIR, filename)
    return get_file(file_path)


def get_file(file_path):
    # 2. 安全检查：防止目录穿越漏洞 (Directory Traversal)
    # 确保用户请求的文件确实在 UPLOAD_DIR 目录下
    real_path = os.path.realpath(file_path)
    if not (real_path.startswith(os.path.realpath(UPLOAD_DIR)) or real_path.startswith(os.path.realpath(OUTPUT_DIR))):
        raise HTTPException(status_code=403, detail="拒绝访问该路径")

    # 3. 检查文件是否存在
    if not os.path.exists(real_path):
        raise HTTPException(status_code=404, detail="视频不存在")

    # 4. 返回文件流
    # media_type 会根据后缀自动识别（如 image/jpeg），也可以手动指定
    return FileResponse(real_path)