import json
import time
import random
import asyncio
import aiohttp
from typing import List, Optional, Tuple, Dict, Any

from redis.asyncio import Redis
from starlette.concurrency import run_in_threadpool
from app.core.biz_exception import NotFoundError, PermissionDeniedError, BizLogicError

from app.schemas.troov import TroovRate
from app.utils.france_slot_api import troov_create_session_old
from app.utils.proxy_utils import load_proxies_from_json
from app.core.logger import logger


POP_TOKEN_LUA = """
local cursor = "0"
local max_ttl = -1
local max_key = nil

repeat
    local result = redis.call('SCAN', cursor, 'MATCH', 'token:*', 'COUNT', 50)
    cursor = result[1]
    local keys = result[2]

    for _, key in ipairs(keys) do
        local ttl = redis.call('TTL', key)
        if ttl > max_ttl then
            max_ttl = ttl
            max_key = key
        end
    end
until cursor == "0"

if max_key then
    local value = redis.call('GET', max_key)
    redis.call('DEL', max_key)
    return {max_key, value, max_ttl}
end

return nil
"""

async def get_valid_token_from_redis(redis_client: Redis, timeout: int = 30) -> Optional[str]:
    """
    尝试从 Redis 获取有效的验证码 Token。
    包含重试机制。
    """
    start_time = time.time()
    
    while time.time() - start_time < timeout:
        # 执行 Lua 脚本原子获取
        result = await redis_client.eval(POP_TOKEN_LUA, 0)
        
        if result:
            try:
                # result 结构: [key, value_str, ttl]
                body_str = result[1]
                body = json.loads(body_str)
                token = body.get("token")
                if token:
                    return token
            except (json.JSONDecodeError, IndexError, AttributeError):
                logger.warning("Redis retrieved invalid token format")
        
        # 没拿到或格式不对，稍作等待
        await asyncio.sleep(1)
    
    return None


# =========================================================
# 2. 网络请求模块
# =========================================================

async def fetch_troov_availability(
    session_data: Dict[str, Any], 
    date: str, 
    proxy_url: str
) -> str:
    """
    请求 Troov 预约可用性接口。
    强制使用指定的代理。
    """
    url = (
        "https://51.254.177.49/api/team/"
        "621540d353069dec25bd0045/reservations/availability"
    )
    
    # URL 参数
    params = {
        "name": "Visas",
        "date": date,
        "places": "-5",
        "matching": "",
        "maxCapacity": "-5",
        "sessionId": session_data.get("session_id")
    }

    headers = {
        "accept": "application/json, text/plain, */*",
        "accept-language": "zh-CN,zh;q=0.9,en;q=0.8",
        # "origin": "https://consulat.gouv.fr",
        # "referer": "https://consulat.gouv.fr/en/ambassade-de-france-en-irlande/appointment?name=Visas",
        "user-agent": (
            "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
            "AppleWebKit/537.36 (KHTML, like Gecko) "
            "Chrome/141.0.0.0 Safari/537.36"
        ),
        "x-gouv-app-id": session_data.get("x_gouv_app_id"),
        "x-gouv-web": "fr.gouv.consulat",
    }

    timeout = aiohttp.ClientTimeout(total=15)
    
    connector = aiohttp.TCPConnector(ssl=False)

    # 显式使用传入的 proxy_url
    async with aiohttp.ClientSession(timeout=timeout, connector=connector) as session:
        async with session.get(
            url, 
            params=params, 
            headers=headers, 
            proxy=proxy_url
        ) as resp:
            resp.raise_for_status() # 如果状态码不是 200，抛出异常
            return await resp.text()


# =========================================================
# 3. 核心业务流程
# =========================================================

def _get_proxy_pool() -> List[str]:
    """加载代理池配置"""
    proxies = []
    # 可以在此处扩展更多 pool 类型
    for pool in ("oxylabs",):
        proxies.extend(load_proxies_from_json("data/proxy_pool_config.json", pool))
    return proxies


async def get_rate_by_date(
    redis_client: Redis,
    date: str
) -> Optional[List[TroovRate]]:
    """
    主入口：根据日期获取 Troov 预约信息
    流程：获取代理 -> 获取 Token -> 创建会话(Sync) -> 获取数据(Async)
    """

    # 1. 准备代理
    proxies = _get_proxy_pool()
    if not proxies:
        raise NotFoundError(message="Proxy pool is empty")
    
    # 随机选择一个代理，并在整个流程中保持一致
    current_proxy = random.choice(proxies)

    # 2. 获取验证码 Token
    captcha_token = await get_valid_token_from_redis(redis_client)
    if not captcha_token:
        raise NotFoundError(message="Failed to retrieve captcha token within timeout")


    logger.info(f"Creating session with proxy: {current_proxy}...")
    session_dic = await run_in_threadpool(
        troov_create_session_old, 
        current_proxy, 
        captcha_token
    )
    
    if not session_dic:
        raise BizLogicError(message="Failed to create Troov session (session_dic is empty)")
        
    logger.info(f"Troov session created successfully: {session_dic.get('session_id')}")

    # 确保这里传入了 current_proxy
    response_text = await fetch_troov_availability(session_dic, date, current_proxy)
    
    # 解析数据
    data = json.loads(response_text)
    # 这里可以加一步数据校验，确保 data 是 List[TroovRate] 格式
    return data