package moderation

import "strings"

var visibleTextKeys = map[string]bool{
	"txt": true, "text": true, "title": true, "caption": true,
	"description": true, "file_name": true, "filename": true, "name": true,
}

func ExtractText(content any) string {
	parts := make([]string, 0, 4)
	var walk func(any, int, bool)
	walk = func(value any, depth int, includeString bool) {
		if depth > 6 || value == nil {
			return
		}
		switch typed := value.(type) {
		case string:
			if text := strings.TrimSpace(typed); includeString && text != "" {
				parts = append(parts, text)
			}
		case map[string]any:
			for key, item := range typed {
				walk(item, depth+1, visibleTextKeys[strings.ToLower(strings.TrimSpace(key))])
			}
		case []any:
			for _, item := range typed {
				walk(item, depth+1, includeString)
			}
		}
	}
	walk(content, 0, true)
	return strings.TrimSpace(strings.Join(parts, "\n"))
}