package safety

import (
	"context"
	"strings"
)

// Filter filters content for safety
type Filter interface {
	Filter(ctx context.Context, text string) (*FilterResult, error)
}

// FilterResult contains filtering results
type FilterResult struct {
	Allowed    bool
	Blocked    bool
	Redacted   string
	Categories []string // e.g., "profanity", "pii", "abuse"
}

// ContentFilter implements content filtering
type ContentFilter struct {
	blockedWords []string
}

// NewContentFilter creates a new content filter
func NewContentFilter() *ContentFilter {
	return &ContentFilter{
		blockedWords: []string{
			// Add blocked words/phrases
		},
	}
}

// Filter filters content
func (f *ContentFilter) Filter(ctx context.Context, text string) (*FilterResult, error) {
	lowerText := strings.ToLower(text)
	var categories []string

	// Check for blocked words
	for _, word := range f.blockedWords {
		if strings.Contains(lowerText, strings.ToLower(word)) {
			categories = append(categories, "profanity")
			return &FilterResult{
				Allowed:    false,
				Blocked:    true,
				Redacted:   f.redactPII(text),
				Categories: categories,
			}, nil
		}
	}

	// TODO: Add more sophisticated filtering (ML models, etc.)

	return &FilterResult{
		Allowed:  true,
		Blocked:  false,
		Redacted: f.redactPII(text),
	}, nil
}

// redactPII redacts personally identifiable information
func (f *ContentFilter) redactPII(text string) string {
	// TODO: Implement PII detection and redaction
	// For now, return as-is
	return text
}