using ClawdDotNet.Core.Backup;
using ClawdDotNet.Core.Config;
using ClawdDotNet.Core.Instances;
using Shouldly;

namespace ClawdDotNet.Manager.Tests;

/// <summary>
/// Tests for backup and restore in the manager (#530, stage 6).
/// </summary>
public sealed class BackupManagementTests : IDisposable
{
    private readonly string _root = Path.Combine(
        Path.GetTempPath(), "clawd-tests", "backup-" + Guid.NewGuid().ToString("N")[..8]);

    public BackupManagementTests()
    {
        Directory.CreateDirectory(_root);
    }

    public void Dispose()
    {
        try { Directory.Delete(_root, recursive: true); }
        catch { }
    }

    [Fact]
    public void BackupDirectory_resolves_under_Backups_by_default()
    {
        var instancePath = Path.Combine(_root, "TestInstance");
        Directory.CreateDirectory(instancePath);

        var config = new InstanceConfig { WorkingDirectory = instancePath };
        var backupDir = InstanceLayout.ResolveBackupDirectory(config, instancePath);

        backupDir.ShouldBe(Path.Combine(instancePath, "Backups"));
    }

    [Fact]
    public async Task Backup_can_be_created_verified_and_restored()
    {
        var instancePath = Path.Combine(_root, "InstanceAlpha");
        Directory.CreateDirectory(instancePath);

        var settingsPath = Path.Combine(instancePath, "InstanceSettings.json");
        await File.WriteAllTextAsync(settingsPath, """
            {
                "instanceId": "alpha-123",
                "instanceName": "Alpha",
                "workingDirectory": ""
            }
            """);

        var testDataPath = Path.Combine(instancePath, "data.txt");
        await File.WriteAllTextAsync(testDataPath, "Wichtige Testdaten");

        var backupDir = InstanceLayout.ResolveBackupDirectory(
            new InstanceConfig { WorkingDirectory = instancePath }, instancePath);
        Directory.CreateDirectory(backupDir);

        var zipPath = Path.Combine(backupDir, "backup_Alpha_test.zip");

        var service = new BackupService();
        var backupResult = await service.CreateAsync(instancePath, zipPath, new BackupOptions
        {
            Secrets = SecretMode.Exclude,
            IncludeChatHistory = true,
            IncludeLogs = false
        });

        File.Exists(zipPath).ShouldBeTrue();
        backupResult.SizeBytes.ShouldBeGreaterThan(0);

        // Check
        var manifest = await service.InspectAsync(zipPath);
        manifest.InstanceId.ShouldBe("alpha-123");
        manifest.InstanceName.ShouldBe("Alpha");
        manifest.Files.Count.ShouldBeGreaterThan(0);

        // Modify a file in the target and check the restore
        await File.WriteAllTextAsync(testDataPath, "Überschriebene Testdaten");

        var restoreResult = await service.RestoreAsync(
            zipPath,
            instancePath,
            new RestoreOptions { Overwrite = true });

        restoreResult.Written.ShouldContain("data.txt");
        var restoredContent = await File.ReadAllTextAsync(testDataPath);
        restoredContent.ShouldBe("Wichtige Testdaten");

        // Delete
        File.Delete(zipPath);
        File.Exists(zipPath).ShouldBeFalse();
    }
}