package lifecycle

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

	"github.com/aritmolab/thothii/tools/tht/internal/config"
	"github.com/aritmolab/thothii/tools/tht/internal/safeio"
)

func TestLifecycleLockIsExclusivePerInstallationAndReusableAfterRelease(t *testing.T) {
	root := lifecycleTestRoot(t)
	installation := config.Installation{ProjectDirectory: root, Path: filepath.Join(root, "thothii-installation.yaml")}
	if err := os.MkdirAll(installation.ControlDirectory(), 0o755); err != nil {
		t.Fatal(err)
	}
	first, err := Acquire(installation)
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = first.Release() })
	for name, path := range map[string]string{
		"lifecycle parent":    filepath.Dir(installation.ControlDirectory()),
		"lifecycle directory": installation.ControlDirectory(),
		"owner file":          first.Path(),
	} {
		t.Run(name, func(t *testing.T) {
			var err error
			if name == "owner file" {
				err = safeio.ValidatePrivateRegular(path)
			} else {
				err = safeio.ValidatePrivateDirectory(path)
			}
			if err != nil {
				t.Fatalf("%s protection = %v", name, err)
			}
		})
	}

	if _, err := Acquire(installation); !errors.Is(err, ErrLocked) {
		t.Fatalf("second Acquire() error = %v, want ErrLocked", err)
	}
	if err := first.Release(); err != nil {
		t.Fatal(err)
	}
	second, err := Acquire(installation)
	if err != nil {
		t.Fatalf("Acquire() after release: %v", err)
	}
	if err := second.Release(); err != nil {
		t.Fatal(err)
	}
}

func TestLifecycleLockReleaseDoesNotRemoveAnotherOwnersFile(t *testing.T) {
	root := lifecycleTestRoot(t)
	installation := config.Installation{ProjectDirectory: root, Path: filepath.Join(root, "thothii-installation.yaml")}
	lock, err := Acquire(installation)
	if err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(lock.Path(), []byte(`{"token":"different-owner"}`), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := lock.Release(); !errors.Is(err, ErrOwnership) {
		t.Fatalf("Release() error = %v, want ErrOwnership", err)
	}
	if _, err := os.Stat(lock.Path()); err != nil {
		t.Fatalf("foreign lock was removed: %v", err)
	}
}

func TestTransactionCapabilityIsInstallationBoundAndExpiresOnRelease(t *testing.T) {
	root := lifecycleTestRoot(t)
	installation := config.Installation{ProjectDirectory: root, Path: filepath.Join(root, "thothii-installation.yaml")}
	transaction, err := AcquireTransaction(installation)
	if err != nil {
		t.Fatal(err)
	}
	if err := transaction.Verify(installation); err != nil {
		t.Fatalf("Verify() active capability error = %v", err)
	}

	otherRoot := lifecycleTestRoot(t)
	other := config.Installation{ProjectDirectory: otherRoot, Path: filepath.Join(otherRoot, "thothii-installation.yaml")}
	if err := transaction.Verify(other); !errors.Is(err, ErrTransactionInstallation) {
		t.Fatalf("Verify() for another installation error = %v, want ErrTransactionInstallation", err)
	}
	if err := transaction.Release(); err != nil {
		t.Fatal(err)
	}
	if err := transaction.Verify(installation); !errors.Is(err, ErrTransactionInactive) {
		t.Fatalf("Verify() after Release() error = %v, want ErrTransactionInactive", err)
	}
}

func lifecycleTestRoot(t *testing.T) string {
	t.Helper()
	root, err := filepath.EvalSymlinks(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	return root
}