package tenantpurge

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

	"github.com/klarkxy/nekonest-cloud/relay/internal/tenantfs"
)

const testTenantID = "tenant_0123456789abcdef0123456789abcdef"

func TestPurgeDeletesLiveDataAndEveryBackupIdempotently(t *testing.T) {
	dataRoot := t.TempDir()
	backupRoot := t.TempDir()
	paths, err := tenantfs.Resolve(dataRoot, testTenantID)
	if err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(paths.Database, []byte("sqlite"), 0o600); err != nil {
		t.Fatal(err)
	}
	backupTenant := filepath.Join(backupRoot, filepath.Base(paths.Root))
	for _, name := range []string{"g1", "g2"} {
		path := filepath.Join(backupTenant, name)
		if err := os.MkdirAll(path, 0o700); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(filepath.Join(path, "manifest.json"), []byte("{}"), 0o600); err != nil {
			t.Fatal(err)
		}
	}
	first, err := Purge(context.Background(), dataRoot, backupRoot, testTenantID, 3)
	if err != nil {
		t.Fatal(err)
	}
	if !first.DataDeleted || !first.BackupsDeleted || len(first.EvidenceSHA256) != 64 {
		t.Fatalf("purge result = %#v", first)
	}
	if _, err := os.Lstat(paths.Root); !os.IsNotExist(err) {
		t.Fatalf("live tenant data survived: %v", err)
	}
	if _, err := os.Lstat(backupTenant); !os.IsNotExist(err) {
		t.Fatalf("tenant backups survived: %v", err)
	}
	second, err := Purge(context.Background(), dataRoot, backupRoot, testTenantID, 3)
	if err != nil {
		t.Fatal(err)
	}
	if second.DataDeleted || second.BackupsDeleted || second.EvidenceSHA256 != first.EvidenceSHA256 {
		t.Fatalf("idempotent retry = %#v", second)
	}
}

func TestPurgeRefusesSymbolicLinksWithoutTouchingTarget(t *testing.T) {
	dataRoot := t.TempDir()
	backupRoot := t.TempDir()
	outside := t.TempDir()
	outsideFile := filepath.Join(outside, "keep.txt")
	if err := os.WriteFile(outsideFile, []byte("keep"), 0o600); err != nil {
		t.Fatal(err)
	}
	paths, err := tenantfs.Resolve(dataRoot, testTenantID)
	if err != nil {
		t.Fatal(err)
	}
	if err := os.Symlink(outsideFile, filepath.Join(paths.Root, "escape")); err != nil {
		t.Skipf("symbolic links unavailable: %v", err)
	}
	if _, err := Purge(context.Background(), dataRoot, backupRoot, testTenantID, 1); err == nil {
		t.Fatal("purge followed or accepted a symbolic link")
	}
	if data, err := os.ReadFile(outsideFile); err != nil || string(data) != "keep" {
		t.Fatalf("outside target changed: data=%q err=%v", data, err)
	}
}