package services

import (
	"gauth-central/internal/database"
	"gauth-central/internal/models"
	"time"
)

type SettingsService struct {
	cacheService *CacheService
}

func NewSettingsService() *SettingsService {
	return &SettingsService{
		cacheService: NewCacheService(),
	}
}

// ==================== CORS WHITELIST ====================

func (s *SettingsService) GetAllCorsWhitelist() ([]models.CorsWhitelist, error) {
	var whitelists []models.CorsWhitelist
	err := database.DB.Where("is_active = ?", true).Order("created_at DESC").Find(&whitelists).Error
	return whitelists, err
}

func (s *SettingsService) GetActiveWhitelistOrigins() ([]string, error) {
	// Try cache first
	cached, err := s.cacheService.GetCorsWhitelist()
	if err == nil && cached != nil {
		return cached, nil
	}

	// Fetch from database
	var whitelists []models.CorsWhitelist
	err = database.DB.Where("is_active = ?", true).Find(&whitelists).Error
	if err != nil {
		return nil, err
	}

	origins := make([]string, len(whitelists))
	for i, w := range whitelists {
		origins[i] = w.Origin
	}

	// Cache for 1 hour
	s.cacheService.SetCorsWhitelist(origins, 1*time.Hour)

	return origins, nil
}

func (s *SettingsService) CreateCorsWhitelist(whitelist *models.CorsWhitelist) error {
	err := database.DB.Create(whitelist).Error
	if err != nil {
		return err
	}

	// Invalidate cache
	s.cacheService.InvalidateCorsWhitelist()
	return nil
}

func (s *SettingsService) UpdateCorsWhitelist(id string, updates map[string]interface{}) error {
	err := database.DB.Model(&models.CorsWhitelist{}).Where("id = ?", id).Updates(updates).Error
	if err != nil {
		return err
	}

	// Invalidate cache
	s.cacheService.InvalidateCorsWhitelist()
	return nil
}

func (s *SettingsService) DeleteCorsWhitelist(id string) error {
	err := database.DB.Delete(&models.CorsWhitelist{}, "id = ?", id).Error
	if err != nil {
		return err
	}

	// Invalidate cache
	s.cacheService.InvalidateCorsWhitelist()
	return nil
}

// ==================== CORS BLACKLIST ====================

func (s *SettingsService) GetAllCorsBlacklist() ([]models.CorsBlacklist, error) {
	var blacklists []models.CorsBlacklist
	err := database.DB.Where("is_active = ?", true).Order("created_at DESC").Find(&blacklists).Error
	return blacklists, err
}

func (s *SettingsService) GetActiveBlacklistOrigins() ([]string, error) {
	// Try cache first
	cached, err := s.cacheService.GetCorsBlacklist()
	if err == nil && cached != nil {
		return cached, nil
	}

	// Fetch from database
	var blacklists []models.CorsBlacklist
	err = database.DB.Where("is_active = ?", true).Find(&blacklists).Error
	if err != nil {
		return nil, err
	}

	origins := make([]string, len(blacklists))
	for i, b := range blacklists {
		origins[i] = b.Origin
	}

	// Cache for 1 hour
	s.cacheService.SetCorsBlacklist(origins, 1*time.Hour)

	return origins, nil
}

func (s *SettingsService) CreateCorsBlacklist(blacklist *models.CorsBlacklist) error {
	err := database.DB.Create(blacklist).Error
	if err != nil {
		return err
	}

	// Invalidate cache
	s.cacheService.InvalidateCorsBlacklist()
	return nil
}

func (s *SettingsService) UpdateCorsBlacklist(id string, updates map[string]interface{}) error {
	err := database.DB.Model(&models.CorsBlacklist{}).Where("id = ?", id).Updates(updates).Error
	if err != nil {
		return err
	}

	// Invalidate cache
	s.cacheService.InvalidateCorsBlacklist()
	return nil
}

func (s *SettingsService) DeleteCorsBlacklist(id string) error {
	err := database.DB.Delete(&models.CorsBlacklist{}, "id = ?", id).Error
	if err != nil {
		return err
	}

	// Invalidate cache
	s.cacheService.InvalidateCorsBlacklist()
	return nil
}

// ==================== RATE LIMIT SETTINGS ====================

func (s *SettingsService) GetAllRateLimitSettings() ([]models.RateLimitSetting, error) {
	var settings []models.RateLimitSetting
	err := database.DB.Order("name ASC").Find(&settings).Error
	return settings, err
}

func (s *SettingsService) GetRateLimitSettingsMap() (map[string]*models.RateLimitSetting, error) {
	// Try cache first
	cached, err := s.cacheService.GetRateLimitSettings()
	if err == nil && cached != nil {
		return cached, nil
	}

	// Fetch from database
	var settings []models.RateLimitSetting
	err = database.DB.Where("is_active = ?", true).Find(&settings).Error
	if err != nil {
		return nil, err
	}

	settingsMap := make(map[string]*models.RateLimitSetting)
	for i := range settings {
		settingsMap[settings[i].Name] = &settings[i]
	}

	// Cache for 1 hour
	s.cacheService.SetRateLimitSettings(settingsMap, 1*time.Hour)

	return settingsMap, nil
}

func (s *SettingsService) GetRateLimitSettingByName(name string) (*models.RateLimitSetting, error) {
	settingsMap, err := s.GetRateLimitSettingsMap()
	if err != nil {
		return nil, err
	}

	setting, exists := settingsMap[name]
	if !exists {
		return nil, nil
	}

	return setting, nil
}

func (s *SettingsService) UpdateRateLimitSetting(id string, updates map[string]interface{}) error {
	err := database.DB.Model(&models.RateLimitSetting{}).Where("id = ?", id).Updates(updates).Error
	if err != nil {
		return err
	}

	// Invalidate cache
	s.cacheService.InvalidateRateLimitSettings()
	return nil
}

// Check if origin is allowed
func (s *SettingsService) IsOriginAllowed(origin string) (bool, error) {
	// Check blacklist first
	blacklist, err := s.GetActiveBlacklistOrigins()
	if err != nil {
		return false, err
	}

	for _, blocked := range blacklist {
		if blocked == origin {
			return false, nil
		}
	}

	// Check whitelist
	whitelist, err := s.GetActiveWhitelistOrigins()
	if err != nil {
		return false, err
	}

	for _, allowed := range whitelist {
		if allowed == origin || allowed == "*" {
			return true, nil
		}
	}

	return false, nil
}