package config

import (
	"sync"
)

// ServiceDictionary 服务字典管理器
type ServiceDictionary struct {
	mu          sync.RWMutex
	userDict    map[string][]string
	passwords   []string
	initialized bool
}

// NewServiceDictionary 创建服务字典管理器
func NewServiceDictionary() *ServiceDictionary {
	return &ServiceDictionary{
		userDict:    getDefaultUserDict(),
		passwords:   getDefaultPasswords(),
		initialized: true,
	}
}

// getDefaultUserDict 获取默认用户字典
func getDefaultUserDict() map[string][]string {
	// 返回常量的深拷贝
	result := make(map[string][]string)
	for service, users := range DefaultUserDict {
		usersCopy := make([]string, len(users))
		copy(usersCopy, users)
		result[service] = usersCopy
	}
	return result
}

// getDefaultPasswords 获取默认密码字典
func getDefaultPasswords() []string {
	// 返回常量的副本
	result := make([]string, len(DefaultPasswords))
	copy(result, DefaultPasswords)
	return result
}

// GetAllUserDicts 获取所有服务的用户字典
func (sd *ServiceDictionary) GetAllUserDicts() map[string][]string {
	sd.mu.RLock()
	defer sd.mu.RUnlock()

	result := make(map[string][]string)
	for service, users := range sd.userDict {
		usersCopy := make([]string, len(users))
		copy(usersCopy, users)
		result[service] = usersCopy
	}
	return result
}

// GetPasswords 获取默认密码字典
func (sd *ServiceDictionary) GetPasswords() []string {
	sd.mu.RLock()
	defer sd.mu.RUnlock()

	// 返回副本，避免外部修改
	result := make([]string, len(sd.passwords))
	copy(result, sd.passwords)
	return result
}


// 全局服务字典实例
var (
	globalServiceDict *ServiceDictionary
	serviceDictOnce   sync.Once
)

// GetGlobalServiceDict 获取全局服务字典实例
func GetGlobalServiceDict() *ServiceDictionary {
	serviceDictOnce.Do(func() {
		globalServiceDict = NewServiceDictionary()
	})
	return globalServiceDict
}