package linter

import "strings"

// DetectPrimaryLanguage returns a clean language name without slashes or special chars.
func DetectPrimaryLanguage(files []string) string {
	if len(files) == 0 {
		return "unknown"
	}

	counts := make(map[string]int)
	for _, file := range files {
		lang, err := DetectLanguage(file)
		if err == nil && lang != nil {
			name := strings.ToLower(lang.Name)
			// Clean the name: turn "C/C++" into "c"
			if name == "c/c++" || name == "c++" {
				name = "c"
			}
			counts[name]++
		}
	}

	if len(counts) == 0 {
		return "unknown"
	}

	var bestLang string
	maxCount := -1
	for lang, count := range counts {
		if count > maxCount {
			maxCount = count
			bestLang = lang
		}
	}

	// Bias toward Go in mixed repos, otherwise prefer "c" for C files
	if counts["go"] > 0 && counts["go"] >= maxCount/2 {
		return "go"
	}

	return bestLang
}

// SupportedLanguages returns all known languages (for future use or error messages).
func SupportedLanguages() []string {
	var langs []string
	for _, l := range languages {
		langs = append(langs, strings.ToLower(l.Name))
	}
	return langs
}