package logging

import (
	"fmt"
	"sort"
	"strings"
)

// WarnMissingTranslations groups missing keys without wrapping long key lists.
func WarnMissingTranslations(missing map[string][]string) {
	if message := missingTranslations(missing); message != "" {
		Warn("Locale", "%s", message)
	}
}

func missingTranslations(missing map[string][]string) string {
	languages := make([]string, 0, len(missing))
	width := len("Language")
	for lang, keys := range missing {
		if len(keys) > 0 {
			languages = append(languages, lang)
			width = max(width, len(lang))
		}
	}
	if len(languages) == 0 {
		return ""
	}
	sort.Strings(languages)
	var message strings.Builder
	fmt.Fprintf(&message, "Missing translation keys:\n%-*s  %-8s  %s\n", width, "Language", "Fallback", "Key")
	for _, lang := range languages {
		keys := append([]string(nil), missing[lang]...)
		sort.Strings(keys)
		for i, key := range keys {
			label, fallback := "", ""
			if i == 0 {
				label, fallback = lang, "en-US"
			}
			fmt.Fprintf(&message, "%-*s  %-8s  %s\n", width, label, fallback, key)
		}
	}
	return strings.TrimSuffix(message.String(), "\n")
}