package e2e

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

// Every comment in this tree is one line, which is a standing instruction, so a test holds it.
func TestEveryCommentIsOneLine(t *testing.T) {
	root, err := filepath.Abs("..")
	if err != nil {
		t.Fatal(err)
	}
	skip := map[string]bool{".git": true, "plans": true, "misc": true, ".playwright-mcp": true}
	err = filepath.WalkDir(root, func(path string, d os.DirEntry, err error) error {
		if err != nil {
			return nil
		}
		if d.IsDir() {
			if skip[d.Name()] {
				return filepath.SkipDir
			}
			return nil
		}
		switch filepath.Ext(path) {
		case ".go", ".js", ".css":
		default:
			return nil
		}
		body, err := os.ReadFile(path)
		if err != nil {
			return nil
		}
		where := strings.TrimPrefix(path, root+string(filepath.Separator))
		run, start := 0, 0
		for i, line := range strings.Split(string(body), "\n") {
			if strings.HasPrefix(strings.TrimSpace(line), "//") {
				if run == 0 {
					start = i + 1
				}
				run++
				continue
			}
			if run > 1 {
				t.Errorf("%s:%d has a %d line comment block, and every comment here is one line", where, start, run)
			}
			run = 0
		}
		if run > 1 {
			t.Errorf("%s:%d has a %d line comment block, and every comment here is one line", where, start, run)
		}
		if strings.Contains(string(body), "/*") && filepath.Ext(path) == ".css" {
			for i, line := range strings.Split(string(body), "\n") {
				open := strings.Contains(line, "/*")
				if open && !strings.Contains(line[strings.Index(line, "/*"):], "*/") {
					t.Errorf("%s:%d opens a css comment it does not close on the same line", where, i+1)
				}
			}
		}
		return nil
	})
	if err != nil {
		t.Fatal(err)
	}
}