package desktop

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

// The desktop modules that carry this package. Each builds alone, so each has its own copy; this
// test, itself one of the copied files, holds them to one text wherever the siblings are present.
var carriers = []string{"xorg", "lemurs", "i3", "xterm", "adwaita"}

func TestEveryDesktopModuleCarriesTheSameCopy(t *testing.T) {
	mine, err := filepath.Glob("*.go")
	if err != nil || len(mine) == 0 {
		t.Fatal("no files of this package found", err)
	}
	compared := 0
	for _, module := range carriers {
		dir := filepath.Join("..", "..", "..", module, "internal", "desktop")
		if _, err := os.Stat(dir); err != nil {
			continue
		}
		theirs, _ := filepath.Glob(filepath.Join(dir, "*.go"))
		if len(theirs) != len(mine) {
			t.Errorf("%s carries %d files of this package, this copy %d", module, len(theirs), len(mine))
			continue
		}
		for _, f := range mine {
			a, _ := os.ReadFile(f)
			b, err := os.ReadFile(filepath.Join(dir, f))
			if err != nil || !bytes.Equal(a, b) {
				t.Errorf("%s's copy of %s differs from this one: change every copy together", module, f)
			}
		}
		compared++
	}
	if compared == 0 {
		t.Log("no sibling copies beside this module")
	}
}