//go:build !windows

package backup

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

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

func TestStageArchiveRejectsSymlinkedInstallationAncestor(t *testing.T) {
	root, err := filepath.EvalSymlinks(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	realProject := filepath.Join(root, "real-project")
	linkedProject := filepath.Join(root, "linked-project")
	if err := os.Mkdir(realProject, 0o700); err != nil {
		t.Fatal(err)
	}
	if err := os.Symlink(realProject, linkedProject); err != nil {
		t.Fatal(err)
	}
	installation := config.Installation{
		Path:             filepath.Join(linkedProject, "deploy", "local-dev", "thothii-installation.yaml"),
		ProjectDirectory: linkedProject,
	}
	if err := os.MkdirAll(installation.ControlDirectory(), 0o700); err != nil {
		t.Fatal(err)
	}
	archive := filepath.Join(root, "valid.zip")
	writePreflightArchive(t, archive, preflightArchiveSpec{
		entries: []preflightArchiveEntry{{path: "configuration/operator.env", body: []byte("safe")}},
	})
	result, err := Preflight(context.Background(), installation, PreflightRequest{Archive: archive, Confirm: true}, permissivePreflightDependencies())
	if err != nil {
		t.Fatal(err)
	}
	defer result.CloseArchive()

	if _, err := result.StageArchive(context.Background()); err == nil || !strings.Contains(err.Error(), "staging root") {
		t.Fatalf("StageArchive() error = %v, want unsafe symlinked staging-root rejection", err)
	}
}

func TestStageArchiveCreatesUnixPrivateRegularFile(t *testing.T) {
	installation := preflightTestInstallation(t)
	if err := os.MkdirAll(installation.ControlDirectory(), 0o700); err != nil {
		t.Fatal(err)
	}
	archive := filepath.Join(t.TempDir(), "valid.zip")
	writePreflightArchive(t, archive, preflightArchiveSpec{
		entries: []preflightArchiveEntry{{path: "configuration/operator.env", body: []byte("safe")}},
	})
	result, err := Preflight(context.Background(), installation, PreflightRequest{Archive: archive, Confirm: true}, permissivePreflightDependencies())
	if err != nil {
		t.Fatal(err)
	}
	defer result.CloseArchive()

	staged, err := result.StageArchive(context.Background())
	if err != nil {
		t.Fatal(err)
	}
	defer staged.Close()
	if err := safeio.ValidatePrivateRegular(staged.path); err != nil {
		t.Fatalf("staged archive privacy = %v, want owner-private regular file", err)
	}
	info, err := os.Lstat(staged.path)
	if err != nil {
		t.Fatal(err)
	}
	if got := info.Mode().Perm(); got != 0o600 {
		t.Fatalf("staged archive mode = %#o, want 0600", got)
	}
}

func TestStageArchiveCloseUsesPinnedRootAfterAncestorSwap(t *testing.T) {
	installation := preflightTestInstallation(t)
	if err := os.MkdirAll(installation.ControlDirectory(), 0o700); err != nil {
		t.Fatal(err)
	}
	archive := filepath.Join(t.TempDir(), "valid.zip")
	writePreflightArchive(t, archive, preflightArchiveSpec{
		entries: []preflightArchiveEntry{{path: "configuration/operator.env", body: []byte("safe")}},
	})
	result, err := Preflight(context.Background(), installation, PreflightRequest{Archive: archive, Confirm: true}, permissivePreflightDependencies())
	if err != nil {
		t.Fatal(err)
	}
	defer result.CloseArchive()

	outsideParent, err := filepath.EvalSymlinks(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	outside := filepath.Join(outsideParent, "outside")
	if err := os.Mkdir(outside, 0o700); err != nil {
		t.Fatal(err)
	}
	if err := safeio.ProtectPrivateDirectory(outside); err != nil {
		t.Fatal(err)
	}
	sentinelPath := filepath.Join(outside, "sentinel")
	sentinel := []byte("outside sentinel")
	if err := os.WriteFile(sentinelPath, sentinel, 0o600); err != nil {
		t.Fatal(err)
	}

	swapped := false
	restoreHook := safeio.SetPrivateDirectoryTestHookForTest(func(stage string) {
		if stage != "before-stage-archive-remove" || swapped {
			return
		}
		swapped = true
		movedRoot := result.stagingRoot + "-original"
		if err := os.Rename(result.stagingRoot, movedRoot); err != nil {
			t.Fatal(err)
		}
		if err := os.Symlink(outside, result.stagingRoot); err != nil {
			t.Fatal(err)
		}
	})
	defer restoreHook()

	staged, err := result.StageArchive(context.Background())
	if err != nil {
		t.Fatal(err)
	}
	stagedName := staged.name
	movedRoot := result.stagingRoot + "-original"
	if filepath.Dir(staged.path) != result.stagingRoot {
		t.Fatalf("staged archive directory = %q, want %q", filepath.Dir(staged.path), result.stagingRoot)
	}
	if err := staged.Close(); err != nil {
		t.Fatal(err)
	}
	if !swapped {
		t.Fatal("stage archive cleanup hook did not run")
	}
	if _, err := os.Stat(filepath.Join(movedRoot, stagedName)); !errors.Is(err, os.ErrNotExist) {
		t.Fatalf("moved staging archive = %v, want os.ErrNotExist", err)
	}
	gotSentinel, err := os.ReadFile(sentinelPath)
	if err != nil {
		t.Fatal(err)
	}
	if string(gotSentinel) != string(sentinel) {
		t.Fatalf("outside sentinel = %q, want %q", gotSentinel, sentinel)
	}
}