# uvicorn app:app --host 0.0.0.0 --port 7860 --reload 

from fastapi import FastAPI, Request, HTTPException, Depends, status
from fastapi.responses import Response # 导入Response
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials # 导入HTTPBearer和HTTPAuthorizationCredentials
import httpx # 使用httpx替代requests，因为requests是同步的，而FastAPI是异步的
import os, json
import logging # 导入logging模块
from dotenv import load_dotenv
from enum import Enum
from proxy import do_proxy

# 配置日志
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)

# 加载环境变量
load_dotenv()

# 从环境变量获取代理自身的API密钥
proxy_api_key = os.getenv("PROXY_API_KEY")

# 定义HTTPBearer安全方案
security = HTTPBearer()

# 枚举校验协议类型
class ProtocolType(str, Enum):
    HTTP = "http"
    HTTPS = "https"

# 依赖函数：验证代理的API密钥
def verify_proxy_api_key(credentials: HTTPAuthorizationCredentials = Depends(security)):
    if not proxy_api_key or credentials.credentials != proxy_api_key:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid or missing proxy API key",
            headers={"WWW-Authenticate": "Bearer"},
        )
    return credentials.credentials

app = FastAPI(title="Common Proxy API")

@app.get("/")
def greet_json():
    return {"Hello": "World!"}

# 3. 健康检查接口（可选，用于验证服务是否正常）
@app.get("/health")
async def health_check():
    return {"status": "ok", "message": "Proxy service is running."}


@app.api_route("/v1/{protocol}/{host}/{path:path}", methods=["GET", "POST", "PUT", "DELETE"])
# @app.api_route("/v1/{protocol}/{host}/{path:path}", methods=["POST"])
async def proxy(request: Request, protocol: ProtocolType, host:str, path: str, proxy_api_key: str = Depends(verify_proxy_api_key)): # 添加代理认证依赖
    real_url = f"{protocol.value}://{host}/{path}"
    
    # 提取客户端请求的headers和body
    client_headers = dict(request.headers)
    client_body = await request.body()

    # 移除FastAPI自带的Host头，避免目标网站校验报错
    client_headers.pop("host", None)
    client_headers.pop("authorization", None)

    # 将User-Agent改为curl/8.7.1，以模拟curl请求
    client_headers["User-Agent"] = "curl/8.7.1"
    
    logger.info(f"Proxying request to: {real_url}")
    logger.debug(f"Request method: {request.method}, Headers: {client_headers}")
    
    # 调用 do_proxy 并返回其结果，此处传的 headers 是不带 api_key 的数据
    return await do_proxy(real_url, request.method, client_headers, client_body)