import os
import json
import redis
import random
from datetime import datetime
from typing import List, Dict, Any, Optional


class RedisTaskManager:
    def __init__(self, config_data: Dict[str, Any]):
        self.config_data = config_data
        """初始化Redis连接"""
        self.redis_client = redis.Redis(
            host=self.config_data['redis_config']['host'],
            port=self.config_data['redis_config']['port'],
            password=self.config_data['redis_config']['password'],
            db=self.config_data['redis_config']['db'],
            decode_responses=True
        )
        self.expire_hours = 24  # 过期时间24小时
        self.processing_timeout = 300
        self.lock_timeout = 30  # 锁超时时间

    def write_data(self, key: str, data: Any, expire_time: Optional[int] = None):
        """
        写入数据到Redis，设置过期时间
        Args:
            key: Redis键名
            data: 要存储的数据
            expire_time: 自定义过期时间（秒），默认24小时
        Returns:
            bool: 写入是否成功
        """
        try:
            # 如果数据是字典或列表，先序列化为JSON
            if isinstance(data, (dict, list)):
                data_str = json.dumps(data, ensure_ascii=False)
            else:
                data_str = str(data)
            # 设置过期时间，优先使用自定义时间
            expire_seconds = expire_time if expire_time is not None else self.expire_hours * 3600
            result = self.redis_client.setex(key, expire_seconds, data_str)
            if result:
                print(f"数据写入成功 - 键: {key}, 过期时间: {expire_seconds}秒")
                return True
            else:
                print(f"数据写入失败 - 键: {key}")
                return False

        except Exception as e:
            print(f"写入Redis数据时发生错误: {e}")
            return False

    def read_data(self, key: str):
        """
        从Redis读取数据
        Args:
            key: Redis键名
        Returns:
            Optional[Any]: 读取到的数据，如果键不存在返回None
        """
        try:
            data_str = self.redis_client.get(key)
            if data_str is None:
                return None
            # 尝试解析JSON数据
            try:
                return json.loads(data_str)
            except json.JSONDecodeError:
                # 如果不是JSON格式，返回原始字符串
                return data_str
        except Exception as e:
            print(f"读取Redis数据时发生错误: {e}")
            return None

    def add_task_to_set(self, task_data: Dict[str, Any]) -> bool:
        """添加任务到Redis集合"""
        try:
            # 生成唯一任务标识
            task_data['created_time'] = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
            key = f"{task_data['shop_id']}_{task_data['item_id']}"
            redis_key = f"{task_data["region"].lower()}_{task_data['app_name'].lower()}"
            # 检查任务是否已存在
            existing_task = self.redis_client.hget(redis_key, key)
            if existing_task:
                print(f"任务已存在: {key}")
                return False
            task_json = json.dumps(task_data)
            # 使用HSET添加任务，并设置过期时间
            result = self.redis_client.hset(redis_key, key, task_json)
            self.redis_client.expire(redis_key, self.processing_timeout)
            return result > 0
        except Exception as e:
            print(f"添加任务失败: {e}")
            return False

    def get_random_task_and_delete(self, key: str) -> Optional[Dict[str, Any]]:
        """随机获取一个任务并从HSET中删除，确保一次性消费"""
        lock_key = f"{key}:lock"
        # 尝试获取分布式锁
        if self._acquire_lock(lock_key):
            try:
                # 获取HSET中的所有任务
                all_tasks = self.redis_client.hgetall(key)
                if not all_tasks:
                    return None
                # 随机选择一个任务
                task_id = random.choice(list(all_tasks.keys()))
                task_json = all_tasks[task_id]
                task_data = json.loads(task_json)
                # 删除该任务
                self.redis_client.hdel(key, task_id)
                return task_data
            finally:
                self._release_lock(lock_key)
        else:
            print("获取锁失败，可能其他进程正在处理")
            return None

    def get_and_process_task(self, key: str, process_callback: callable) -> bool:
        """获取并处理任务"""
        task_data = self.get_random_task_and_delete(key)
        if task_data:
            try:
                result = process_callback(task_data)
                return result
            except Exception as e:
                print(f"任务处理失败: {e}")
                return False
        return False

    def _acquire_lock(self, lock_key: str) -> bool:
        """获取分布式锁"""
        try:
            # 使用SET命令获取锁，NX表示不存在时才设置，EX设置过期时间
            result = self.redis_client.set(lock_key, "locked", ex=self.lock_timeout, nx=True)
            return result is not None
        except Exception as e:
            print(f"获取锁失败: {e}")
            return False

    def _release_lock(self, lock_key: str) -> bool:
        """释放分布式锁"""
        try:
            self.redis_client.delete(lock_key)
            return True
        except Exception as e:
            print(f"释放锁失败: {e}")
            return False

    def get_task_count(self, key: str) -> int:
        """获取指定key中的任务数量"""
        try:
            return self.redis_client.hlen(key)
        except Exception as e:
            print(f"获取任务数量失败: {e}")
            return 0

    def get_all_tasks(self, key: str) -> List[Dict[str, Any]]:
        """获取所有任务（仅查看，不删除）"""
        try:
            all_tasks = self.redis_client.hgetall(key)
            return [json.loads(task_json) for task_json in all_tasks.values()]
        except Exception as e:
            print(f"获取所有任务失败: {e}")
            return []

    def clear_all_tasks(self, key: str) -> bool:
        """清空所有任务"""
        try:
            self.redis_client.delete(key)
            return True
        except Exception as e:
            print(f"清空任务失败: {e}")
            return False