package services

import (
	"context"
	"strings"

	"gorm.io/gorm"
)

// moderationKeywordRow maps to moderation_keywords table for Pluck.
type moderationKeywordRow struct {
	Word string `gorm:"column:word"`
}

// CommentModerationService provides deterministic keyword-based moderation (no ML).
// v0.10.3 F201: ORIGIN_REVISION_SUMMARY §2 "Modération : règles déterministes"
type CommentModerationService struct {
	db *gorm.DB
}

// NewCommentModerationService creates a new comment moderation service.
func NewCommentModerationService(db *gorm.DB) *CommentModerationService {
	return &CommentModerationService{db: db}
}

// ContainsBannedKeyword checks if content contains any banned keyword (case-insensitive).
// Returns true if content should be rejected.
func (s *CommentModerationService) ContainsBannedKeyword(ctx context.Context, content string) (bool, error) {
	var rows []moderationKeywordRow
	if err := s.db.WithContext(ctx).
		Table("moderation_keywords").
		Select("word").
		Find(&rows).Error; err != nil {
		return false, err
	}

	contentLower := strings.ToLower(content)
	for _, row := range rows {
		if strings.Contains(contentLower, strings.ToLower(row.Word)) {
			return true, nil
		}
	}
	return false, nil
}