package automation

import (
	"context"
	"fmt"

	applogger "github.com/gochat/gochat/pkg/logger"
)

// BotTriggerConfigService provides CRUD for bot trigger condition configurations.
// Reference: Chatwoot automation_rule trigger conditions adapted for AgentBot event subscription.
// TriggerConfigs define when and under what conditions a bot should be triggered on an inbox.
type BotTriggerConfigService struct {
	db DBProvider
}

// NewBotTriggerConfigService creates a new BotTriggerConfigService.
func NewBotTriggerConfigService(db DBProvider) *BotTriggerConfigService {
	return &BotTriggerConfigService{db: db}
}

// GetByID retrieves a bot trigger config by ID.
func (s *BotTriggerConfigService) GetByID(ctx context.Context, id uint) (*BotTriggerConfig, error) {
	var config BotTriggerConfig
	if err := s.db.DB().WithContext(ctx).First(&config, id).Error; err != nil {
		return nil, err
	}
	return &config, nil
}

// ListByAccount retrieves all bot trigger configs for an account.
func (s *BotTriggerConfigService) ListByAccount(ctx context.Context, accountID uint) ([]BotTriggerConfig, error) {
	var configs []BotTriggerConfig
	if err := s.db.DB().WithContext(ctx).
		Where("account_id = ?", accountID).
		Order("id ASC").
		Find(&configs).Error; err != nil {
		return nil, err
	}
	return configs, nil
}

// ListByAgentBot retrieves all trigger configs for a specific AgentBot.
func (s *BotTriggerConfigService) ListByAgentBot(ctx context.Context, accountID uint, agentBotID uint) ([]BotTriggerConfig, error) {
	var configs []BotTriggerConfig
	if err := s.db.DB().WithContext(ctx).
		Where("account_id = ? AND agent_bot_id = ?", accountID, agentBotID).
		Order("id ASC").
		Find(&configs).Error; err != nil {
		return nil, err
	}
	return configs, nil
}

// ListActiveByAccountAndEvent retrieves active trigger configs for a given account and event.
// Used by AgentBotRuleListener to determine which bots should be triggered.
func (s *BotTriggerConfigService) ListActiveByAccountAndEvent(ctx context.Context, accountID uint, eventName BotRuleEventType) ([]BotTriggerConfig, error) {
	var configs []BotTriggerConfig
	if err := s.db.DB().WithContext(ctx).
		Where("account_id = ? AND event_name = ? AND active = ?", accountID, eventName, true).
		Order("id ASC").
		Find(&configs).Error; err != nil {
		return nil, err
	}
	return configs, nil
}

// Create creates a new bot trigger config.
func (s *BotTriggerConfigService) Create(ctx context.Context, config *BotTriggerConfig) error {
	// Validate conditions before saving (convert TriggerConditions → Conditions for validation)
	conditions := make(Conditions, len(config.Conditions))
	for i, tc := range config.Conditions {
		conditions[i] = Condition(tc)
	}
	if err := ValidateConditions(conditions); err != nil {
		return fmt.Errorf("invalid conditions: %w", err)
	}
	return s.db.DB().WithContext(ctx).Select(
		"AccountID", "AgentBotID", "EventName", "Name", "Description",
		"Conditions", "QueryOperator", "Active",
	).Create(config).Error
}

// Update updates an existing bot trigger config.
func (s *BotTriggerConfigService) Update(ctx context.Context, config *BotTriggerConfig) error {
	conditions := make(Conditions, len(config.Conditions))
	for i, tc := range config.Conditions {
		conditions[i] = Condition(tc)
	}
	if err := ValidateConditions(conditions); err != nil {
		return fmt.Errorf("invalid conditions: %w", err)
	}
	return s.db.DB().WithContext(ctx).Save(config).Error
}

// Delete soft-deletes a bot trigger config.
func (s *BotTriggerConfigService) Delete(ctx context.Context, id uint) error {
	return s.db.DB().WithContext(ctx).Delete(&BotTriggerConfig{}, id).Error
}

// ToggleActive toggles the active state of a bot trigger config.
func (s *BotTriggerConfigService) ToggleActive(ctx context.Context, id uint, active bool) error {
	return s.db.DB().WithContext(ctx).
		Model(&BotTriggerConfig{}).
		Where("id = ?", id).
		Update("active", active).Error
}

// MatchAndTrigger checks all active trigger configs for the given event and account,
// runs condition filters, and triggers the associated AgentBot for matching configs.
// Reference: mirrors AutomationRuleService.MatchAndExecute but for trigger config scope.
// The actual bot action execution is delegated to BotRuleService.MatchAndExecute.
func (s *BotTriggerConfigService) MatchAndTrigger(ctx context.Context, accountID uint, eventName BotRuleEventType, conversationID uint, eventData map[string]interface{}) ([]uint, error) {
	configs, err := s.ListActiveByAccountAndEvent(ctx, accountID, eventName)
	if err != nil {
		return nil, fmt.Errorf("failed to load trigger configs: %w", err)
	}

	if len(configs) == 0 {
		applogger.L().Debugf("no active trigger configs for account %d event %s", accountID, eventName)
		return nil, nil
	}

	// Load the conversation for condition matching
	conversation, err := loadConversationForFilter(ctx, s.db.DB(), conversationID)
	if err != nil {
		return nil, fmt.Errorf("failed to load conversation %d: %w", conversationID, err)
	}

	var matchedBotIDs []uint
	for _, config := range configs {
		// Convert TriggerConditions → Conditions for MatchConditions call
		conditions := make(Conditions, len(config.Conditions))
		for i, tc := range config.Conditions {
			conditions[i] = Condition(tc)
		}

		matched, err := MatchConditions(ctx, s.db.DB(), conditions, conversation, eventData)
		if err != nil {
			applogger.L().Errorf("condition matching failed for trigger config %d: %v", config.ID, err)
			continue
		}
		if !matched {
			applogger.L().Debugf("trigger config %d did not match conditions for conversation %d", config.ID, conversationID)
			continue
		}

		applogger.L().Infof("trigger config %d matched for conversation %d, bot %d should be triggered",
			config.ID, conversationID, config.AgentBotID)
		matchedBotIDs = append(matchedBotIDs, config.AgentBotID)
	}

	return matchedBotIDs, nil
}