package services

import (
	"context"
	"fmt"
	"time"

	"go.uber.org/zap"
	"gorm.io/gorm"

	"veza-backend-api/internal/models"
)

// FeatureFlagService handles feature flags (v0.803 ADM1-05)
type FeatureFlagService struct {
	db     *gorm.DB
	logger *zap.Logger
}

// NewFeatureFlagService creates a new FeatureFlagService
func NewFeatureFlagService(db *gorm.DB, logger *zap.Logger) *FeatureFlagService {
	return &FeatureFlagService{db: db, logger: logger}
}

// List returns all feature flags
func (s *FeatureFlagService) List(ctx context.Context) ([]models.FeatureFlag, error) {
	var list []models.FeatureFlag
	if err := s.db.WithContext(ctx).Order("name ASC").Find(&list).Error; err != nil {
		return nil, fmt.Errorf("failed to list feature flags: %w", err)
	}
	return list, nil
}

// Toggle enables or disables a feature flag by name
func (s *FeatureFlagService) Toggle(ctx context.Context, name string, enabled bool) (*models.FeatureFlag, error) {
	var flag models.FeatureFlag
	if err := s.db.WithContext(ctx).Where("name = ?", name).First(&flag).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, fmt.Errorf("feature flag not found: %s", name)
		}
		return nil, fmt.Errorf("failed to get feature flag: %w", err)
	}
	flag.Enabled = enabled
	flag.UpdatedAt = time.Now()
	if err := s.db.WithContext(ctx).Save(&flag).Error; err != nil {
		return nil, fmt.Errorf("failed to update feature flag: %w", err)
	}
	return &flag, nil
}