package redis

import (
	"context"
	"fmt"
	"time"

	"github.com/alicebob/miniredis/v2"
	"github.com/redis/go-redis/v9"

	"carrot_bbs/internal/config"
)

// Client Redis客户端
type Client struct {
	rdb         *redis.Client
	isMiniRedis bool
	mr          *miniredis.Miniredis
}

// New 创建Redis客户端
func New(cfg *config.RedisConfig) (*Client, error) {
	switch cfg.Type {
	case "miniredis":
		// 启动内嵌Redis模拟
		mr, err := miniredis.Run()
		if err != nil {
			return nil, fmt.Errorf("failed to start miniredis: %w", err)
		}
		rdb := redis.NewClient(&redis.Options{
			Addr:     mr.Addr(),
			Password: "",
			DB:       0,
		})
		return &Client{
			rdb:         rdb,
			isMiniRedis: true,
			mr:          mr,
		}, nil
	case "redis":
		// 使用真实Redis
		rdb := redis.NewClient(&redis.Options{
			Addr:     cfg.Redis.Addr(),
			Password: cfg.Redis.Password,
			DB:       cfg.Redis.DB,
			PoolSize: cfg.PoolSize,
		})
		ctx := context.Background()
		if err := rdb.Ping(ctx).Err(); err != nil {
			return nil, fmt.Errorf("failed to connect to redis: %w", err)
		}
		return &Client{rdb: rdb, isMiniRedis: false}, nil
	default:
		// 默认使用miniredis
		mr, err := miniredis.Run()
		if err != nil {
			return nil, fmt.Errorf("failed to start miniredis: %w", err)
		}
		rdb := redis.NewClient(&redis.Options{
			Addr: mr.Addr(),
		})
		return &Client{
			rdb:         rdb,
			isMiniRedis: true,
			mr:          mr,
		}, nil
	}
}

// Get 获取值
func (c *Client) Get(ctx context.Context, key string) (string, error) {
	return c.rdb.Get(ctx, key).Result()
}

// Set 设置值
func (c *Client) Set(ctx context.Context, key string, value interface{}, expiration time.Duration) error {
	return c.rdb.Set(ctx, key, value, expiration).Err()
}

// Del 删除键
func (c *Client) Del(ctx context.Context, keys ...string) error {
	return c.rdb.Del(ctx, keys...).Err()
}

// Exists 检查键是否存在
func (c *Client) Exists(ctx context.Context, keys ...string) (int64, error) {
	return c.rdb.Exists(ctx, keys...).Result()
}

// Incr 递增
func (c *Client) Incr(ctx context.Context, key string) (int64, error) {
	return c.rdb.Incr(ctx, key).Result()
}

// Expire 设置过期时间
func (c *Client) Expire(ctx context.Context, key string, expiration time.Duration) (bool, error) {
	return c.rdb.Expire(ctx, key, expiration).Result()
}

// GetClient 获取原生客户端
func (c *Client) GetClient() *redis.Client {
	return c.rdb
}

// Close 关闭连接
func (c *Client) Close() error {
	if err := c.rdb.Close(); err != nil {
		return err
	}
	if c.mr != nil {
		c.mr.Close()
	}
	return nil
}

// IsMiniRedis 返回是否是miniredis
func (c *Client) IsMiniRedis() bool {
	return c.isMiniRedis
}