package linter

import (
	"path/filepath"
	"strings"
)

// DetectPrimaryLanguage returns the dominant language in the given list of files.
// It counts occurrences of each detected language and returns the most frequent one.
// Falls back to "go" (common default) or "unknown".
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)
			counts[name]++
		}
	}

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

	// Find the language with the highest count
	var bestLang string
	maxCount := -1
	for lang, count := range counts {
		if count > maxCount {
			maxCount = count
			bestLang = lang
		}
	}

	// Friendly bias toward Go in mixed repos (common case)
	if counts["go"] > 0 && counts["go"] >= maxCount/2 {
		return "go"
	}

	return bestLang
}

// SupportedLanguages returns a list of all languages known to the linter.
// Useful for error messages or future prompt discovery.
func SupportedLanguages() []string {
	var langs []string
	for _, l := range languages {
		langs = append(langs, strings.ToLower(l.Name))
	}
	return langs
}