using ZA.CoreService.ESBCertificateManager.Models;

namespace ZA.CoreService.ESBCertificateManager.Services;

/// <summary>
/// Orchestriert nur noch Container-Neustart (kein Deploy/TLS/SQL).
/// </summary>
public sealed class DeploymentOrchestrator
{
    private readonly RestartExecutor _restartExecutor;
    private readonly LocalCertificateDeployer _localCertificateDeployer;
    private readonly PreflightValidator _preflightValidator = new();
    private readonly AppSettings _settings;

    public DeploymentOrchestrator(
        AppSettings settings,
        IReadOnlyList<SonicConnection> sonicConnections)
    {
        _settings = settings;

        _restartExecutor =
            new RestartExecutor(sonicConnections);

        _localCertificateDeployer =
            new LocalCertificateDeployer();
    }


    public PreflightValidationResult ValidateRestartOnly(IReadOnlyList<DeploymentTarget> selectedTargets)
        => _preflightValidator.ValidateRestartOnly(selectedTargets);

    public async Task<DeploymentRunResult> RestartOnlyAsync(
        IReadOnlyList<DeploymentTarget> selectedTargets,
        IProgress<TargetProgressUpdate>? progress,
        CancellationToken cancellationToken = default)
    {
        DateTimeOffset startedAt = DateTimeOffset.Now;
        List<TargetStepResult> results = [];

        using RunLogger logger = new(_settings.LogDirectory);
        logger.Write($"Neustart gestartet für {selectedTargets.Count} Ziel(e).");

        foreach (DeploymentTarget target in selectedTargets)
        {
            cancellationToken.ThrowIfCancellationRequested();
            results.Add(await RestartTargetOnlyAsync(target, logger, progress, cancellationToken));
        }

        DateTimeOffset finishedAt = DateTimeOffset.Now;
        DeploymentRunResult runResult = new()
        {
            TargetResults = results,
            StartedAt = startedAt,
            FinishedAt = finishedAt,
            CertificateFilePath = string.Empty,
            CertificateFingerprint = string.Empty
        };

        logger.Write(
            $"Neustart beendet. Erfolg={runResult.OverallSuccess}; Dauer={(finishedAt - startedAt).TotalSeconds:F1}s; Log={logger.LogFilePath}");

        return runResult;
    }
    public async Task<DeploymentRunResult> DeployAsync(
    string certificateFilePath,
    string certificateFingerprint,
    IReadOnlyList<DeploymentTarget> selectedTargets,
    IProgress<TargetProgressUpdate>? progress,
    CancellationToken cancellationToken = default)
    {
        if (string.IsNullOrWhiteSpace(certificateFilePath))
        {
            throw new ArgumentException(
                "Es wurde kein Zertifikatsdateipfad angegeben.",
                nameof(certificateFilePath));
        }

        if (!File.Exists(certificateFilePath))
        {
            throw new FileNotFoundException(
                "Die ausgewählte Zertifikatsdatei wurde nicht gefunden.",
                certificateFilePath);
        }

        if (selectedTargets.Count == 0)
        {
            throw new ArgumentException(
                "Es wurde kein Bereitstellungsziel ausgewählt.",
                nameof(selectedTargets));
        }

        DateTimeOffset startedAt = DateTimeOffset.Now;
        List<TargetStepResult> results = [];

        using RunLogger logger = new(_settings.LogDirectory);

        logger.Write(
            $"Deployment gestartet für {selectedTargets.Count} Ziel(e). " +
            $"Zertifikat={Path.GetFileName(certificateFilePath)}");

        foreach (DeploymentTarget target in selectedTargets)
        {
            cancellationToken.ThrowIfCancellationRequested();

            TargetStepResult result = await DeployTargetAsync(
                certificateFilePath,
                target,
                logger,
                progress,
                cancellationToken);

            results.Add(result);
        }

        DateTimeOffset finishedAt = DateTimeOffset.Now;

        DeploymentRunResult runResult = new()
        {
            TargetResults = results,
            StartedAt = startedAt,
            FinishedAt = finishedAt,
            CertificateFilePath = certificateFilePath,
            CertificateFingerprint = certificateFingerprint
        };

        logger.Write(
            $"Deployment beendet. Erfolg={runResult.OverallSuccess}; " +
            $"Dauer={(finishedAt - startedAt).TotalSeconds:F1}s; " +
            $"Log={logger.LogFilePath}");

        return runResult;
    }
    private async Task<TargetStepResult> RestartTargetOnlyAsync(
        DeploymentTarget target,
        RunLogger logger,
        IProgress<TargetProgressUpdate>? progress,
        CancellationToken cancellationToken)
    {
        List<string> steps = [];
        DateTimeOffset targetStart = DateTimeOffset.Now;
        progress?.Report(new TargetProgressUpdate(target.Id, "Neustart…", false));

        (bool restartOk, string restartStatus, string? restartDetail) =
            await _restartExecutor.ExecuteAsync(target, cancellationToken);

        steps.Add($"{restartStatus}: {restartDetail}");
        logger.Write($"[{target.Name}] Restart: {restartStatus} | {restartDetail}");

        TargetStepResult targetResult = new()
        {
            TargetId = target.Id,
            TargetName = target.Name,
            Success = restartOk,
            StatusText = restartStatus,
            Detail = restartDetail,
            Steps = steps,
            StartedAt = targetStart,
            FinishedAt = DateTimeOffset.Now,
            CopySucceeded = true,
            RestartSucceeded = restartOk,
            TlsSucceeded = true,
            ObservedFingerprint = null
        };

        progress?.Report(new TargetProgressUpdate(target.Id, restartStatus, restartOk));
        return targetResult;
    }
    private async Task<TargetStepResult> DeployTargetAsync(
    string certificateFilePath,
    DeploymentTarget target,
    RunLogger logger,
    IProgress<TargetProgressUpdate>? progress,
    CancellationToken cancellationToken)
    {
        List<string> steps = [];
        DateTimeOffset targetStart = DateTimeOffset.Now;

        try
        {
            progress?.Report(new TargetProgressUpdate(
                target.Id,
                    $"Zertifikat wird nach '{target.TargetDirectory}' kopiert ...",
                false));

            string deployedFilePath =
                await _localCertificateDeployer.DeployAsync(
                    certificateFilePath,
                    target.TargetDirectory,
                    target.CertificateFileName,
                    target.BackupEnabled,
                    target.BackupDirectoryName,
                    cancellationToken);

            string copyStatus = $"Zertifikat kopiert: {Path.GetFileName(deployedFilePath)}";

            steps.Add(copyStatus);
            logger.Write($"[{target.Name}] {copyStatus} | Ziel={deployedFilePath}");

            progress?.Report(new TargetProgressUpdate(
                target.Id,
                copyStatus,
                true));

            return new TargetStepResult
            {
                TargetId = target.Id,
                TargetName = target.Name,
                Success = true,
                StatusText = "Kopieren erfolgreich",
                Detail = deployedFilePath,
                Steps = steps,
                StartedAt = targetStart,
                FinishedAt = DateTimeOffset.Now,

                CopySucceeded = true,
                RestartSucceeded = true,
                TlsSucceeded = true,
                ObservedFingerprint = null
            };
        }
        catch (OperationCanceledException)
        {
            throw;
        }
        catch (Exception ex)
        {
            string errorStatus = $"Kopieren fehlgeschlagen: {ex.Message}";

            steps.Add(errorStatus);
            logger.Write($"[{target.Name}] {errorStatus}");

            progress?.Report(new TargetProgressUpdate(
                target.Id,
                errorStatus,
                false));

            return new TargetStepResult
            {
                TargetId = target.Id,
                TargetName = target.Name,
                Success = false,
                StatusText = "Kopieren fehlgeschlagen",
                Detail = ex.Message,
                Steps = steps,
                StartedAt = targetStart,
                FinishedAt = DateTimeOffset.Now,

                CopySucceeded = false,
                RestartSucceeded = false,
                TlsSucceeded = false,
                ObservedFingerprint = null
            };
        }
    }
    private static string? CreateCertificateBackup(string currentCertificatePath)
    {
        if (string.IsNullOrWhiteSpace(currentCertificatePath) ||
            !File.Exists(currentCertificatePath))
        {
            return null;
        }

        string certificateDirectory =
            Path.GetDirectoryName(currentCertificatePath)
            ?? throw new InvalidOperationException(
                $"Kein Zielordner für Zertifikat gefunden: {currentCertificatePath}");

        string backupDirectory = Path.Combine(certificateDirectory, "Backup");
        Directory.CreateDirectory(backupDirectory);

        string fileNameWithoutExtension =
            Path.GetFileNameWithoutExtension(currentCertificatePath);

        string extension = Path.GetExtension(currentCertificatePath);

        string timestamp = DateTime.Now.ToString("yyyyMMdd_HHmmss");

        string backupFileName =
            $"{fileNameWithoutExtension}_{timestamp}{extension}";

        string backupPath = Path.Combine(backupDirectory, backupFileName);

        File.Copy(currentCertificatePath, backupPath, overwrite: false);

        return backupPath;
    }
}

public readonly record struct TargetProgressUpdate(int TargetId, string StatusText, bool? SuccessHint);