package installer

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

	"gitgud.io/mike/mpv-manager/pkg/platform"
	"github.com/stretchr/testify/require"
)

func TestConfigRestoreAndRollbackPreservePrivateMode(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("Windows DACL preservation covered by native fileops tests")
	}
	isolateHome(t)
	backup := validBackupPath(t)
	require.NoError(t, os.WriteFile(backup, []byte("volume=21\n"), 0644))
	live := filepath.Join(t.TempDir(), "mpv.conf")
	require.NoError(t, os.WriteFile(live, []byte("volume=41\n"), 0600))
	require.NoError(t, RestoreBackup(OSFileSystem{}, backup, live, nil))
	info, err := os.Stat(live)
	require.NoError(t, err)
	require.Equal(t, os.FileMode(0600), info.Mode().Perm())
	assertTransactionFile(t, live, "volume=21\n")
	recovery := filepath.Join(t.TempDir(), "recovery")
	require.NoError(t, os.WriteFile(recovery, []byte("volume=41\n"), 0600))
	cause := errors.New("activation failed")
	require.ErrorIs(t, rollbackConfigReplacement(live, recovery, cause), cause)
	info, err = os.Stat(live)
	require.NoError(t, err)
	require.Equal(t, os.FileMode(0600), info.Mode().Perm())
	assertTransactionFile(t, live, "volume=41\n")
}

func TestConfigRestoreMissingTargetUsesPrivateSnapshotMode(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("Unix snapshot mode assertion")
	}
	isolateHome(t)
	backup := validBackupPath(t)
	require.NoError(t, os.WriteFile(backup, []byte("volume=21\n"), 0600))
	live := filepath.Join(t.TempDir(), "mpv.conf")
	require.NoError(t, RestoreBackup(OSFileSystem{}, backup, live, nil))
	info, err := os.Stat(live)
	require.NoError(t, err)
	require.Equal(t, os.FileMode(0600), info.Mode().Perm())
	require.NoError(t, os.Remove(live))
	cause := errors.New("activation failed")
	require.ErrorIs(t, rollbackConfigReplacement(live, backup, cause), cause)
	info, err = os.Stat(live)
	require.NoError(t, err)
	require.Equal(t, os.FileMode(0600), info.Mode().Perm())
}

func TestRecommendedDefaultsPreserveModeProfilesAndComments(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("Unix mode assertion")
	}
	live := filepath.Join(t.TempDir(), "mpv.conf")
	original := "# personal comment\nhwdec=auto # safe fallback\n[profile]\nhwdec=no # profile override\n"
	require.NoError(t, os.WriteFile(live, []byte(original), 0600))
	cr, _ := newBufferedRunner()
	require.NoError(t, SetRecommendedHWADecoderIfEmpty(live, platform.Linux, &platform.GPUInfo{Brand: "nvidia"}, cr))
	data, err := os.ReadFile(live)
	require.NoError(t, err)
	require.Contains(t, string(data), "# personal comment")
	require.Contains(t, string(data), "# safe fallback")
	require.Contains(t, string(data), "[profile]\nhwdec=no # profile override\n")
	info, err := os.Stat(live)
	require.NoError(t, err)
	require.Equal(t, os.FileMode(0600), info.Mode().Perm())
}