//go:build windows

package backup

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

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

func TestStageArchiveProtectsWindowsStagingArtifactsWithOwnerOnlyACLs(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 := staged.parent.Validate(); err != nil {
		t.Fatalf("retained staging root ACL = %v, want owner-only", err)
	}
	if err := staged.file.Close(); err != nil {
		t.Fatal(err)
	}
	staged.file = nil
	contents, found, err := staged.parent.ReadRegular(staged.name, 1<<20)
	if err != nil || !found || len(contents) == 0 {
		t.Fatalf("retained staged archive read = found:%t bytes:%d error:%v, want owner-only regular", found, len(contents), err)
	}
}

func TestStageArchiveRetainsTwoFilesThroughOneWindowsRootCapability(t *testing.T) {
	installation := preflightTestInstallation(t)
	archives := []string{filepath.Join(t.TempDir(), "candidate.zip"), filepath.Join(t.TempDir(), "recovery.zip")}
	for _, archive := range archives {
		writePreflightArchive(t, archive, preflightArchiveSpec{
			entries: []preflightArchiveEntry{{path: "configuration/operator.env", body: []byte("safe")}},
		})
	}
	candidate, err := Preflight(context.Background(), installation, PreflightRequest{Archive: archives[0], Confirm: true}, permissivePreflightDependencies())
	if err != nil {
		t.Fatal(err)
	}
	defer candidate.CloseArchive()
	recovery, err := Preflight(context.Background(), installation, PreflightRequest{Archive: archives[1], Confirm: true}, permissivePreflightDependencies())
	if err != nil {
		t.Fatal(err)
	}
	defer recovery.CloseArchive()

	candidateStage, err := candidate.StageArchive(context.Background())
	if err != nil {
		t.Fatal(err)
	}
	recoveryStage, err := recovery.stageArchiveAlongside(context.Background(), candidateStage)
	if err != nil {
		_ = candidateStage.Close()
		t.Fatal(err)
	}
	if candidateStage.parent != recoveryStage.parent {
		t.Fatal("paired stages did not share the retained root capability")
	}
	if err := candidateStage.Close(); err != nil {
		_ = recoveryStage.Close()
		t.Fatal(err)
	}
	if err := recoveryStage.file.Close(); err != nil {
		_ = recoveryStage.Close()
		t.Fatal(err)
	}
	recoveryStage.file = nil
	if _, found, err := recoveryStage.parent.ReadRegular(recoveryStage.name, 1<<20); err != nil || !found {
		_ = recoveryStage.Close()
		t.Fatalf("recovery stage after candidate cleanup = found:%t err:%v", found, err)
	}
	if err := recoveryStage.Close(); err != nil {
		t.Fatal(err)
	}
}

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)
	}

	attemptedSwap := false
	restoreHook := safeio.SetPrivateDirectoryTestHookForTest(func(stage string) {
		if stage != "before-stage-archive-remove" || attemptedSwap {
			return
		}
		attemptedSwap = true
		if err := os.Rename(result.stagingRoot, result.stagingRoot+"-moved"); err == nil {
			t.Fatal("staging-root rename succeeded while Close retained its directory handle")
		}
	})
	defer restoreHook()

	staged, err := result.StageArchive(context.Background())
	if err != nil {
		t.Fatal(err)
	}
	stagedName := staged.name
	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 !attemptedSwap {
		t.Fatal("stage archive cleanup hook did not run")
	}
	if _, err := os.Stat(filepath.Join(result.stagingRoot, stagedName)); !errors.Is(err, os.ErrNotExist) {
		t.Fatalf("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)
	}
}