package config

import (
	"context"
	"fmt"

	"github.com/redis/go-redis/v9"
)

// RedisConfig Redis 配置
type RedisConfig struct {
	Type      string            `mapstructure:"type"`
	Redis     RedisServerConfig `mapstructure:"redis"`
	Miniredis MiniredisConfig   `mapstructure:"miniredis"`
	PoolSize  int               `mapstructure:"pool_size"`
}

// CacheConfig 缓存配置
type CacheConfig struct {
	Enabled        bool             `mapstructure:"enabled"`
	KeyPrefix      string           `mapstructure:"key_prefix"`
	DefaultTTL     int              `mapstructure:"default_ttl"`
	NullTTL        int              `mapstructure:"null_ttl"`
	JitterRatio    float64          `mapstructure:"jitter_ratio"`
	DisableFlushDB bool             `mapstructure:"disable_flushdb"`
	Modules        CacheModuleTTL   `mapstructure:"modules"`
	Local          LocalCacheConfig `mapstructure:"local"`
}

// LocalCacheConfig 本地缓存配置
type LocalCacheConfig struct {
	Enabled    bool `mapstructure:"enabled"`
	Size       int  `mapstructure:"size"`
	Buckets    int  `mapstructure:"buckets"`
	DefaultTTL int  `mapstructure:"default_ttl"`
}

// CacheModuleTTL 缓存模块 TTL 配置
type CacheModuleTTL struct {
	PostList     int `mapstructure:"post_list_ttl"`
	Conversation int `mapstructure:"conversation_ttl"`
	UnreadCount  int `mapstructure:"unread_count_ttl"`
	GroupMembers int `mapstructure:"group_members_ttl"`
}

// RedisServerConfig Redis 服务器配置
type RedisServerConfig struct {
	Host     string `mapstructure:"host"`
	Port     int    `mapstructure:"port"`
	Password string `mapstructure:"password"`
	DB       int    `mapstructure:"db"`
}

// Addr 返回 Redis 服务器地址
func (r RedisServerConfig) Addr() string {
	return fmt.Sprintf("%s:%d", r.Host, r.Port)
}

// MiniredisConfig Miniredis 配置（用于测试）
type MiniredisConfig struct {
	Host string `mapstructure:"host"`
	Port int    `mapstructure:"port"`
}

// NewRedis 创建 Redis 客户端（真实 Redis）
func NewRedis(cfg *RedisConfig) (*redis.Client, error) {
	client := redis.NewClient(&redis.Options{
		Addr:     cfg.Redis.Addr(),
		Password: cfg.Redis.Password,
		DB:       cfg.Redis.DB,
		PoolSize: cfg.PoolSize,
	})

	ctx := context.Background()
	if err := client.Ping(ctx).Err(); err != nil {
		return nil, fmt.Errorf("failed to connect to redis: %w", err)
	}

	return client, nil
}