# 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, pprint
from dotenv import load_dotenv
from enum import Enum
from supabase import create_client, Client
from datetime import datetime, timezone, timedelta, time # 导入 datetime 和 timezone

# 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")

# Supabase 配置
SUPABASE_URL = os.getenv("SUPABASE_URL")
SUPABASE_KEY = os.getenv("SUPABASE_KEY")

# 初始化 Supabase 客户端
supabase: Client = create_client(SUPABASE_URL, SUPABASE_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="Gemini 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
    send_req = await make_send_req(request, protocol, host, path)
    print(send_req)
    print(send_req.get('headers'))

    # 使用httpx异步客户端发起请求
    async with httpx.AsyncClient() as client:
        response = await client.request(
            method=send_req.get('method'),
            url=send_req.get('url'),
            headers=send_req.get('headers'),
            content=send_req.get('content'), # httpx使用content参数传递请求体
            timeout=30  # 超时时间，可调整
        )

    try:
        # 创建北京时间时区对象（UTC+8）
        beijing_tz = timezone(timedelta(hours=8))
        now_beijing = datetime.now(beijing_tz)  # 带时区的datetime对象
        current_local_time = now_beijing.isoformat()
        # current_local_time = int(now_beijing.timestamp())  # 正确的时间戳
        # current_local_time = datetime.now().isoformat()
        supabase.table("airs_api_keys").update({"ran_at": current_local_time}).eq("id", send_req.get('api_key_info').get('api_key_id')).execute()
        print('更新成功')
    except Exception as e:
        raise HTTPException(status_code=500, detail="更新API密钥运行时间失败！")

    return Response(
        content=response.content,
        status_code=response.status_code,
        headers=dict(response.headers)
    )

async def get_api_key_info(model: str = None):
    try:
        # 根据用户提供的SQL语句修改，从 'airs_model_api_keys_view' 视图中获取 'api_key'
        if model:
            response = supabase.from_('airs_model_api_keys_view').select('api_key', 'api_key_id').eq('model_name', model).order('api_key_ran_at', desc=False).limit(1).execute()
        else:
            # 如果没有提供model，则获取所有模型的api_key
            raise HTTPException(status_code=400, detail="请提供模型名称！")
        
        if response.data:
            api_key_info = response.data[0]
            return api_key_info
        else:
            return None
    except Exception as e:
        print(f"从Supabase获取API密钥失败: {e}")
        return None

async def make_send_req(request: Request, protocol: ProtocolType, host:str, path: str):
    _method = request.method
    _url = f"{protocol.value}://{host}/{path}"
    _headers = dict(request.headers)
    # 移除FastAPI自带的Host头，避免Gemini校验报错
    _headers.pop("host", None)
    _headers.pop("authorization", None)
    _headers.pop("user-agent", None)
    _headers.pop("content-length", None)
    # 将User-Agent改为curl/8.7.1，以模拟curl请求
    _headers["User-Agent"] = "curl/8.7.1"

    try:
        # 读取客户端请求体
        _content = await request.body()
        content_json = json.loads(_content)
        try:
            _model = content_json.get("model")
        except Exception as e:
            print(f"获取模型名称失败: {e}")
            return None
    except Exception as e:
        print(f"读取客户端请求体失败: {e}")
        return None
    _api_key_info = await get_api_key_info(_model)
    if not _api_key_info:
        raise HTTPException(status_code=400, detail="未找到匹配的API密钥！")
    _headers["Authorization"] = f"Bearer {_api_key_info['api_key']}"

    send_req={
        "method": _method,
        "url": _url,
        "headers": _headers,
        "content": _content,
        "model": _model,
        "api_key_info": _api_key_info
    }
    return send_req