//go:build darwin

package installer

import (
	"context"
	"os"
	"os/exec"
	"path/filepath"
	"testing"
	"time"

	"gitgud.io/mike/mpv-manager/internal/process"
	"github.com/stretchr/testify/require"
)

// This opt-in native test creates and mounts only a disposable empty image.
// No application/config installation or existing volume is changed.
func TestNativeInterruptedDMGAttachDetachesOwnedMount(t *testing.T) {
	if os.Getenv("MPV_MANAGER_NATIVE_DMG_QA") != "1" {
		t.Skip("set MPV_MANAGER_NATIVE_DMG_QA=1 on disposable native macOS QA")
	}
	root := t.TempDir()
	image := filepath.Join(root, "owned.dmg")
	mountRoot := filepath.Join(root, "mounts")
	require.NoError(t, os.Mkdir(mountRoot, 0700))
	// macOS /var resolves through /private/var; hdiutil reports resolved paths.
	var err error
	mountRoot, err = filepath.EvalSymlinks(mountRoot)
	require.NoError(t, err)
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()
	_, err = process.Output(ctx, exec.CommandContext(ctx, "hdiutil", "create", "-size", "16m", "-fs", "HFS+", "-volname", "MPVManagerOwnedMountQA", image))
	require.NoError(t, err)
	mi := &MacOSInstaller{}
	for _, cause := range []error{context.Canceled, context.DeadlineExceeded} {
		t.Run(cause.Error(), func(t *testing.T) {
			// Emulate an attach that mounted the image, then failed/canceled before its
			// complete plist was accepted. Production uses this same cleanup lifetime.
			err := withOwnedDMGMounts(mountRoot, func() ([]dmgMount, error) {
				attachCtx, attachCancel := context.WithTimeout(context.Background(), 30*time.Second)
				defer attachCancel()
				output, err := process.Output(attachCtx, exec.CommandContext(attachCtx, "hdiutil", "attach", "-plist", "-nobrowse", "-noautoopen", "-readonly", "-mountroot", mountRoot, image))
				if err != nil {
					return nil, err
				}
				mounts, err := parseHDIUtilAttachPlist(output)
				if err != nil {
					return nil, err
				}
				require.NotEmpty(t, mounts)
				return nil, cause
			}, mi.mountedDMGs, mi.unmountDMG, func([]dmgMount) error { t.Fatal("failed attach must not install"); return nil })
			require.ErrorIs(t, err, cause)
			mounts, err := mi.mountedDMGs()
			require.NoError(t, err)
			for _, mount := range mounts {
				require.False(t, pathIsWithinRoot(mountRoot, mount.MountPoint), "owned mount remained attached: %s", mount.MountPoint)
			}
		})
	}
}

func TestNativeInstallerRecoveryInApplications(t *testing.T) {
	if os.Getenv("MPV_MANAGER_NATIVE_DMG_QA") != "1" {
		t.Skip("native disposable QA application-parent policy")
	}
	isolateConfig(t)
	backup, err := os.MkdirTemp("/Applications", ".mpv-manager-file-backup-native-")
	require.NoError(t, err)
	live := backup + "-player"
	journalPath := backup + installerJournalSuffix
	t.Cleanup(func() { _ = os.Remove(live); _ = os.Remove(journalPath); _ = os.RemoveAll(backup) })
	original := filepath.Join(backup, "original")
	require.NoError(t, os.WriteFile(live, []byte("new native payload"), 0600))
	require.NoError(t, os.WriteFile(original, []byte("old native payload"), 0600))
	txn := &installerTransaction{journalPath: journalPath, journal: installerTransactionJournal{Schema: installerTransactionSchema, Kind: installerTransactionFile, State: "applying", Destination: live, BackupRoot: backup, Changes: []installerJournalChange{{Target: live, Backup: original, HadOriginal: true}}}}
	require.NoError(t, txn.write())
	journalPath = txn.journalPath
	require.NoError(t, RecoverInstallerTransactions(live))
	assertTransactionFile(t, live, "old native payload")
	require.NoFileExists(t, journalPath)
	require.NoDirExists(t, backup)
}