package main

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

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestRegistryCredentialsDir(t *testing.T) {
	t.Run("missing file", func(t *testing.T) {
		dir := t.TempDir()
		t.Setenv("DOCKER_CONFIG", dir)
		got, found, readErr := registryCredentialsDir()
		assert.Equal(t, dir, got)
		assert.False(t, found)
		assert.NoError(t, readErr)
	})

	t.Run("readable file", func(t *testing.T) {
		dir := t.TempDir()
		require.NoError(t, os.WriteFile(filepath.Join(dir, "config.json"), []byte("{}"), 0o600))
		t.Setenv("DOCKER_CONFIG", dir)
		_, found, readErr := registryCredentialsDir()
		assert.True(t, found)
		assert.NoError(t, readErr)
	})

	t.Run("unreadable file", func(t *testing.T) {
		if os.Geteuid() == 0 {
			t.Skip("root can read any file")
		}
		dir := t.TempDir()
		require.NoError(t, os.WriteFile(filepath.Join(dir, "config.json"), []byte("{}"), 0o000))
		t.Setenv("DOCKER_CONFIG", dir)
		_, found, readErr := registryCredentialsDir()
		assert.True(t, found)
		assert.Error(t, readErr)
	})
}