package database

import (
	"context"
	"gofaster/internal/shared/config"
	"time"

	"github.com/go-redis/redis/v8"
	"go.uber.org/zap"
)

type RedisClient struct {
	client *redis.Client
	logger *zap.Logger
}

func NewRedisClient(cfg *config.RedisConfig, logger *zap.Logger) *RedisClient {
	if logger == nil {
		logger = zap.L()
	}

	// 记录连接参数（隐藏密码）
	logger.Info("Initializing Redis client",
		zap.String("host", cfg.Host),
		zap.String("port", cfg.Port),
		zap.Int("db", cfg.DB),
		zap.Bool("has_password", cfg.Password != ""),
	)

	client := redis.NewClient(&redis.Options{
		Addr:     cfg.Host + ":" + cfg.Port,
		Password: cfg.Password,
		DB:       cfg.DB,
	})

	// 测试连接（带超时和重试）
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	retries := 3
	var lastErr error
	for i := 0; i < retries; i++ {
		if _, err := client.Ping(ctx).Result(); err != nil {
			lastErr = err
			logger.Warn("Redis connection attempt failed",
				zap.Int("attempt", i+1),
				zap.Error(err),
			)
			time.Sleep(1 * time.Second) // 延迟重试
			continue
		}
		break
	}

	if lastErr != nil {
		logger.Warn("Failed to connect to Redis after retries, continuing without Redis",
			zap.Int("retries", retries),
			zap.Error(lastErr),
		)
		// 返回一个空的 Redis 客户端，程序可以继续运行
		return &RedisClient{
			client: nil,
			logger: logger,
		}
	}

	// 监控连接状态
	go monitorConnection(client, logger)

	logger.Info("Redis client initialized successfully")
	return &RedisClient{
		client: client,
		logger: logger,
	}
}

// 监控 Redis 连接状态
func monitorConnection(client *redis.Client, logger *zap.Logger) {
	if client == nil {
		return // 如果没有 Redis 客户端，不进行监控
	}

	ticker := time.NewTicker(30 * time.Second)
	defer ticker.Stop()

	for range ticker.C {
		ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
		_, err := client.Ping(ctx).Result()
		cancel()

		if err != nil {
			logger.Error("Redis connection health check failed",
				zap.Error(err),
			)
		}
	}
}

func (r *RedisClient) GetClient() *redis.Client {
	return r.client
}

func (r *RedisClient) Close() error {
	if r.client == nil {
		r.logger.Info("No Redis connection to close")
		return nil
	}
	r.logger.Info("Closing Redis connection")
	return r.client.Close()
}