package checks

import (
	"os"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"
	"testing"
)

const maxLines = 400

// TestNoFileExceedsMaxLines ensures no project file exceeds the line limit.
// This keeps the codebase modular and maintainable.
func TestNoFileExceedsMaxLines(t *testing.T) {
	_, thisFile, _, _ := runtime.Caller(0)
	root := filepath.Join(filepath.Dir(thisFile), "..", "..")

	exts := map[string]bool{
		".go": true, ".yml": true, ".yaml": true, ".html": true,
		".sh": true, ".md": true,
	}

	var over []string
	filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return nil
		}
		if info.IsDir() {
			name := info.Name()
			if name == "vendor" || name == "node_modules" || name == ".git" {
				return filepath.SkipDir
			}
			return nil
		}
		if !exts[strings.ToLower(filepath.Ext(path))] {
			return nil
		}
		data, err := os.ReadFile(path)
		if err != nil {
			return nil
		}
		lines := strings.Count(string(data), "\n")
		if strings.HasSuffix(string(data), "\n") {
			// last line has newline
		} else if len(data) > 0 {
			lines++
		}
		if lines > maxLines {
			rel, _ := filepath.Rel(root, path)
			over = append(over, rel+":"+strconv.Itoa(lines))
		}
		return nil
	})

	if len(over) > 0 {
		t.Errorf("files exceed %d lines:\n%s", maxLines, strings.Join(over, "\n"))
	}
}