backend/internal/wire/infrastructure.go

package wire

import (
	"time"

	"carrot_bbs/internal/cache"
	"carrot_bbs/internal/config"
	"carrot_bbs/internal/model"
	"carrot_bbs/internal/pkg/crypto"
	"carrot_bbs/internal/pkg/email"
	"carrot_bbs/internal/pkg/gorse"
	"carrot_bbs/internal/pkg/openai"
	"carrot_bbs/internal/pkg/redis"
	"carrot_bbs/internal/pkg/s3"
	"carrot_bbs/internal/pkg/sse"
	"carrot_bbs/internal/repository"

	"github.com/google/wire"
	"go.uber.org/zap"
	"gorm.io/gorm"
)

// InfrastructureSet 基础设施 Provider Set
var InfrastructureSet = wire.NewSet(
	// 配置
	ProvideConfig,

	// 日志
	ProvideLogger,

	// 数据库
	ProvideDB,

	// 事务管理器
	ProvideTransactionManager,

	// Redis 和缓存
	ProvideRedisClient,
	ProvideCache,

	// SSE Hub
	ProvideSSEHub,

	// 外部服务客户端
	ProvideGorseClient,
	ProvideOpenAIClient,
	ProvideEmailClient,
	ProvideS3Client,

	// 消息加密器
	ProvideMessageEncryptor,
)

// ProvideConfig 加载配置
func ProvideConfig() (*config.Config, error) {
	return config.Load("configs/config.yaml")
}

// ProvideDB 提供数据库连接
func ProvideDB(cfg *config.Config) (*gorm.DB, error) {
	return model.NewDB(&cfg.Database)
}

// ProvideRedisClient 提供 Redis 客户端
func ProvideRedisClient(cfg *config.Config) *redis.Client {
	client, err := redis.New(&cfg.Redis)
	if err != nil {
		zap.L().Warn("Failed to connect to Redis, falling back to memory cache",
			zap.Error(err),
		)
		return nil
	}
	return client
}

// ProvideCache 提供缓存实例
func ProvideCache(cfg *config.Config, redisClient *redis.Client) cache.Cache {
	cache.Configure(cache.Settings{
		Enabled:         cfg.Cache.Enabled,
		KeyPrefix:       cfg.Cache.KeyPrefix,
		DefaultTTL:      time.Duration(cfg.Cache.DefaultTTL) * time.Second,
		NullTTL:         time.Duration(cfg.Cache.NullTTL) * time.Second,
		JitterRatio:     cfg.Cache.JitterRatio,
		PostListTTL:     time.Duration(cfg.Cache.Modules.PostList) * time.Second,
		ConversationTTL: time.Duration(cfg.Cache.Modules.Conversation) * time.Second,
		UnreadCountTTL:  time.Duration(cfg.Cache.Modules.UnreadCount) * time.Second,
		GroupMembersTTL: time.Duration(cfg.Cache.Modules.GroupMembers) * time.Second,
		DisableFlushDB:  cfg.Cache.DisableFlushDB,
	})

	// 直接创建 RedisCache 实例，不依赖全局变量
	if redisClient == nil {
		zap.L().Warn("Redis client is nil, cache will not be available")
		return nil
	}

	cacheInstance := cache.NewRedisCache(redisClient)
	zap.L().Info("Initialized Redis cache via dependency injection")
	return cacheInstance
}

// ProvideSSEHub 提供 SSE Hub
func ProvideSSEHub() *sse.Hub {
	return sse.NewHub()
}

// ProvideGorseClient 提供 Gorse 客户端
func ProvideGorseClient(cfg *config.Config) gorse.Client {
	return gorse.NewClient(gorse.ConfigFromAppConfig(&cfg.Gorse))
}

// ProvideOpenAIClient 提供 OpenAI 客户端
func ProvideOpenAIClient(cfg *config.Config) openai.Client {
	return openai.NewClient(openai.ConfigFromAppConfig(&cfg.OpenAI))
}

// ProvideEmailClient 提供邮件客户端
func ProvideEmailClient(cfg *config.Config) email.Client {
	return email.NewClient(email.ConfigFromAppConfig(&cfg.Email))
}

// ProvideS3Client 提供 S3 客户端
func ProvideS3Client(cfg *config.Config) (*s3.Client, error) {
	return s3.New(&cfg.S3)
}

// ProvideTransactionManager 提供事务管理器
func ProvideTransactionManager(db *gorm.DB) repository.TransactionManager {
	return repository.NewTransactionManager(db)
}

// ProvideMessageEncryptor 提供消息加密器
func ProvideMessageEncryptor(cfg *config.Config) error {
	if !cfg.Encryption.Enabled {
		zap.L().Info("Message encryption is disabled")
		return nil
	}

	if len(cfg.Encryption.Key) != 32 {
		zap.L().Error("Encryption key must be 32 bytes for AES-256",
			zap.Int("actual_length", len(cfg.Encryption.Key)),
		)
		return nil
	}

	if err := crypto.InitMessageEncryptor(cfg.Encryption.Key, cfg.Encryption.KeyVersion); err != nil {
		zap.L().Error("Failed to initialize message encryptor", zap.Error(err))
		return err
	}

	zap.L().Info("Message encryption initialized successfully",
		zap.Int("key_version", cfg.Encryption.KeyVersion),
	)
	return nil
}

// ProvideLogger 提供 Zap Logger
func ProvideLogger() *zap.Logger {
	logger, err := zap.NewProduction()
	if err != nil {
		panic("Failed to create logger: " + err.Error())
	}
	// 设置为全局 logger，以便在其他地方使用 zap.L()
	zap.ReplaceGlobals(logger)
	return logger
}