import os
import time
import logging
import requests
from datetime import datetime, timedelta
from apscheduler.schedulers.background import BackgroundScheduler
from flask import Flask, request, jsonify, Response, stream_with_context

logging.basicConfig(level=logging.INFO,
                    format='%(asctime)s - %(levelname)s - %(message)s')

API_ENDPOINT = "https://api.siliconflow.cn/v1/user/info"
TEST_MODEL_ENDPOINT = "https://api.siliconflow.cn/v1/chat/completions"
MODELS_ENDPOINT = "https://api.siliconflow.cn/v1/models"

app = Flask(__name__)

all_models = []
free_models = []

invalid_keys_global = []
free_keys_global = []
unverified_keys_global = []
valid_keys_global = []

def get_credit_summary(api_key):
    """
    使用 API 密钥获取额度信息。
    """
    headers = {
        "Authorization": f"Bearer {api_key}",
        "Content-Type": "application/json"
    }
    try:
        response = requests.get(API_ENDPOINT, headers=headers)
        response.raise_for_status()
        data = response.json().get("data", {})
        total_balance = data.get("totalBalance", 0)
        return {"total_balance": float(total_balance)}
    except requests.exceptions.RequestException as e:
        logging.error(f"获取额度信息失败，API Key：{api_key}，错误信息：{e}")
        return None
    except (KeyError, TypeError) as e:
        logging.error(f"解析额度信息失败，API Key：{api_key}，错误信息：{e}")
        return None
    except ValueError as e:
        logging.error(f"total_balance 无法转换为浮点数，API Key：{api_key}，错误信息：{e}")
        return None

FREE_MODEL_TEST_KEY = "sk-bmjbjzleaqfgtqfzmcnsbagxrlohriadnxqrzfocbizaxukw"  # 硬编码免费模型测试 KEY

def test_model_availability(api_key, model_name):
    """
    测试指定的模型是否可用。
    """
    headers = {
        "Authorization": f"Bearer {api_key}",
        "Content-Type": "application/json"
    }
    try:
        response = requests.post(TEST_MODEL_ENDPOINT,
                                 headers=headers,
                                 json={
                                     "model": model_name,
                                     "messages": [{"role": "user", "content": "hi"}],
                                     "max_tokens": 10,
                                     "stream": False
                                 },
                                 timeout=10)
        # 正常返回或返回 429 都被认为是免费模型
        if response.status_code == 429 or response.status_code < 500 :
            return True
        else:
            return False
    except requests.exceptions.RequestException as e:
        logging.error(f"测试模型 {model_name} 可用性失败，API Key：{api_key}，错误信息：{e}")
        return False

def refresh_models():
    """
    刷新模型列表和免费模型列表。
    """
    global all_models, free_models

    # 使用 FREE_MODEL_TEST_KEY 获取所有模型列表
    all_models = get_all_models(FREE_MODEL_TEST_KEY)

    free_models = []
    for model in all_models:
        if test_model_availability(FREE_MODEL_TEST_KEY, model):
            free_models.append(model)

    logging.info(f"所有模型列表：{all_models}")
    logging.info(f"免费模型列表：{free_models}")

def load_keys():
    """
    从环境变量中加载 keys，并根据额度和模型可用性进行分类，然后记录到日志中。
    """
    keys_str = os.environ.get("KEYS")
    test_model = os.environ.get("TEST_MODEL", "Pro/google/gemma-2-9b-it")

    invalid_keys = []
    free_keys = []
    unverified_keys = []
    valid_keys = []

    if keys_str:
        keys = [key.strip() for key in keys_str.split(',')]
        logging.info(f"加载的 keys：{keys}")

        for key in keys:
            credit_summary = get_credit_summary(key)
            if credit_summary is None:
                invalid_keys.append(key)
            else:
                total_balance = credit_summary.get("total_balance", 0)
                if total_balance <= 0:
                    free_keys.append(key)
                else:
                    if test_model_availability(key, test_model):
                        valid_keys.append(key)
                    else:
                        unverified_keys.append(key)

        logging.info(f"无效 KEY：{invalid_keys}")
        logging.info(f"免费 KEY：{free_keys}")
        logging.info(f"未实名 KEY：{unverified_keys}")
        logging.info(f"有效 KEY：{valid_keys}")
      
        # 更新全局的 key 列表
        global invalid_keys_global, free_keys_global, unverified_keys_global, valid_keys_global
        invalid_keys_global = invalid_keys
        free_keys_global = free_keys
        unverified_keys_global = unverified_keys
        valid_keys_global = valid_keys

    else:
        logging.warning("环境变量 KEYS 未设置。")

def get_all_models(api_key):
    """
    获取所有模型列表。
    """
    headers = {
        "Authorization": f"Bearer {api_key}",
        "Content-Type": "application/json"
    }
    try:
        response = requests.get(MODELS_ENDPOINT, headers=headers, params={"sub_type": "chat"})
        response.raise_for_status()
        data = response.json()
        # 确保 data 是字典且包含 'data' 键，'data' 对应的值是一个列表
        if isinstance(data, dict) and 'data' in data and isinstance(data['data'], list):
            return [model.get("id") for model in data["data"] if isinstance(model, dict) and "id" in model]
        else:
            logging.error("获取模型列表失败：响应数据格式不正确")
            return []
    except requests.exceptions.RequestException as e:
        logging.error(f"获取模型列表失败，API Key：{api_key}，错误信息：{e}")
        return []
    except (KeyError, TypeError) as e:
        logging.error(f"解析模型列表失败，API Key：{api_key}，错误信息：{e}")
        return []

def determine_request_type(model_name):
    """
    根据用户请求的模型判断请求类型。
    """
    if model_name in free_models:
        return "free"
    elif model_name in all_models:
        return "paid"
    else:
        return "unknown"

def select_key(request_type):
    """
    根据请求类型选择合适的 KEY。
    """
    if request_type == "free":
        # 免费请求：使用 2、3、4 类 KEY
        available_keys = free_keys_global + unverified_keys_global + valid_keys_global
    elif request_type == "paid":
        # 付费请求：使用 3、4 类 KEY
        available_keys = unverified_keys_global + valid_keys_global
    else:
        # 未知请求：使用所有 KEY
        available_keys = free_keys_global + unverified_keys_global + valid_keys_global

    if not available_keys:
        return None

    # 简单的轮询策略选择 KEY
    key = available_keys[int(time.time() * 1000) % len(available_keys)]
    return key

def check_authorization(request):
    """
    检查请求头中的 Authorization 字段是否匹配环境变量 AUTHORIZATION_KEY。
    """
    authorization_key = os.environ.get("AUTHORIZATION_KEY")
    if not authorization_key:
        logging.warning("环境变量 AUTHORIZATION_KEY 未设置，请设置后重试。")
        return False

    auth_header = request.headers.get('Authorization')
    if not auth_header:
        logging.warning("请求头中缺少 Authorization 字段。")
        return False

    if auth_header != f"Bearer {authorization_key}":
        logging.warning(f"无效的 Authorization 密钥：{auth_header}")
        return False

    return True

# 创建一个后台调度器
scheduler = BackgroundScheduler()

# 添加定时任务，每小时执行一次 load_keys 函数
scheduler.add_job(load_keys, 'interval', hours=1)
# 添加定时任务，每10分钟执行一次 refresh_models 函数
scheduler.add_job(refresh_models, 'interval', minutes=10)

@app.route('/')
def index():
    """
    处理根路由的访问请求。
    """
    return "<h1>Welcome to SiliconFlow</h1>"

@app.route('/check_tokens', methods=['POST'])
def check_tokens():
    """
    处理前端发送的 Token 检测请求。
    """
    tokens = request.json.get('tokens', [])
    test_model = os.environ.get("TEST_MODEL", "Pro/google/gemma-2-9b-it")

    results = []
    for token in tokens:
        credit_summary = get_credit_summary(token)
        if credit_summary is None:
            results.append({"token": token, "type": "无效 KEY", "balance": 0, "message": "无法获取额度信息"})
        else:
            total_balance = credit_summary.get("total_balance", 0)
            if total_balance <= 0:
                results.append({"token": token, "type": "免费 KEY", "balance": total_balance, "message": "额度不足"})
            else:
                if test_model_availability(token, test_model):
                    results.append({"token": token, "type": "有效 KEY", "balance": total_balance, "message": "可以使用指定模型"})
                else:
                    results.append({"token": token, "type": "未实名 KEY", "balance": total_balance, "message": "无法使用指定模型"})

    return jsonify(results)

@app.route('/handsome/v1/chat/completions', methods=['POST'])
def handsome_chat_completions():
    """
    处理 /handsome/v1/chat/completions 路由的请求，添加鉴权。
    """
    if not check_authorization(request):
        return jsonify({"error": "Unauthorized"}), 401

    data = request.get_json()
    if not data or 'model' not in data:
        return jsonify({"error": "Invalid request data"}), 400

    model_name = data['model']
    request_type = determine_request_type(model_name)
    api_key = select_key(request_type)

    if not api_key:
        return jsonify({"error": "No available API key for this request type"}), 400

    headers = {
        "Authorization": f"Bearer {api_key}",
        "Content-Type": "application/json"
    }

    # 转发请求到真正的 API
    try:
        response = requests.post(
            TEST_MODEL_ENDPOINT,
            headers=headers,
            json=data,
            stream=data.get("stream", False),
            timeout=60
        )
      
        # 检查是否是429错误
        if response.status_code == 429:
            return jsonify(response.json()), 429

        if data.get("stream", False):
            return Response(stream_with_context(response.iter_content(chunk_size=1024)), content_type=response.headers['Content-Type'])
        else:
            response.raise_for_status()
            return jsonify(response.json())
    except requests.exceptions.RequestException as e:
        return jsonify({"error": str(e)}), 500

@app.route('/handsome/v1/models', methods=['GET'])
def list_models():
    """
    处理 /handsome/v1/models 路由的请求，返回模型列表。
    """
    if not check_authorization(request):
        return jsonify({"error": "Unauthorized"}), 401

    # 返回模型列表和免费模型列表
    return jsonify({
        "data": [{"id": model, "object": "model"} for model in all_models],
        "free_models": free_models
    })

def get_billing_info():
    """
    获取所有KEY的额度信息。
    """
    total_balance = 0
    for key in valid_keys_global + unverified_keys_global:
        credit_summary = get_credit_summary(key)
        if credit_summary:
            total_balance += credit_summary.get("total_balance", 0)
    return total_balance

@app.route('/handsome/v1/dashboard/billing/usage', methods=['GET'])
def billing_usage():
    """
    处理 /handsome/v1/dashboard/billing/usage 路由的请求，返回用量信息（修改后，始终返回 0）。
    """
    if not check_authorization(request):
        return jsonify({"error": "Unauthorized"}), 401

    end_date = datetime.now()
    start_date = end_date - timedelta(days=30)

    # 构造用量数据（修改后，始终返回 0）
    daily_usage = []
    current_date = start_date
    while current_date <= end_date:
        daily_usage.append({
            "timestamp": int(current_date.timestamp()),
            "daily_usage": 0
        })
        current_date += timedelta(days=1)

    return jsonify({
        "object": "list",
        "data": daily_usage,
        "total_usage": 0
    })

@app.route('/handsome/v1/dashboard/billing/subscription', methods=['GET'])
def billing_subscription():
    """
    处理 /handsome/v1/dashboard/billing/subscription 路由的请求，返回订阅信息。
    """
    if not check_authorization(request):
        return jsonify({"error": "Unauthorized"}), 401

    total_balance = get_billing_info()

    return jsonify({
        "object": "billing_subscription",
        "has_payment_method": False,
        "canceled": False,
        "canceled_at": None,
        "delinquent": None,
        "access_until": int(datetime(9999, 12, 31).timestamp()),  # 设置一个较远的未来时间
        "soft_limit": 0,
        "hard_limit": total_balance,
        "system_hard_limit": total_balance,
        "soft_limit_usd": 0,
        "hard_limit_usd": total_balance,
        "system_hard_limit_usd": total_balance,
        "plan": {
            "name": "SiliconFlow API",
            "id": "siliconflow-api"
        },
        "account_name": "SiliconFlow User",
        "po_number": None,
        "billing_email": None,
        "tax_ids": [],
        "billing_address": None,
        "business_address": None
    })

if __name__ == '__main__':
    # 打印所有环境变量，方便调试
    logging.info(f"环境变量：{os.environ}")

    # 初始化全局的 key 列表
    invalid_keys_global = []
    free_keys_global = []
    unverified_keys_global = []
    valid_keys_global = []

    # 启动调度器
    scheduler.start()

    # 手动触发一次 load_keys 任务
    load_keys()
    logging.info("首次加载 keys 已手动触发执行")

    # 手动触发一次 refresh_models 任务
    refresh_models()
    logging.info("首次刷新模型列表已手动触发执行")

    # 启动 Flask 应用，监听所有 IP 的 7860 端口（Hugging Face Space 默认端口）
    app.run(debug=False, host='0.0.0.0', port=int(os.environ.get('PORT', 7860)))