using ZA.CoreService.ESBCertificateManager.Data;
using ZA.CoreService.ESBCertificateManager.Models;

namespace ZA.CoreService.ESBCertificateManager.Services;

public sealed class DeploymentOrchestrator
{
    private readonly CertificateDeployer _deployer = new();
    private readonly RestartExecutor _restartExecutor;
    private readonly TlsCertificateProbe _tlsProbe;
    private readonly PreflightValidator _preflightValidator = new();
    private readonly SqlRunLogger _sqlRunLogger;
    private readonly AppSettings _settings;

    public DeploymentOrchestrator(AppSettings settings)
    {
        _settings = settings;
        _tlsProbe = new TlsCertificateProbe(settings.TlsTimeoutSeconds, settings.TlsRetryCount);
        _restartExecutor = new RestartExecutor(settings.SonicConnections);
        _sqlRunLogger = new SqlRunLogger(settings.ConnectionString);
    }

    public PreflightValidationResult ValidatePreflight(
        string? certificatePath,
        CertificateInfo? certificateInfo,
        IReadOnlyList<DeploymentTarget> selectedTargets)
        => _preflightValidator.Validate(certificatePath, certificateInfo, selectedTargets);

    public async Task<DeploymentRunResult> RunAsync(
        string certificatePath,
        CertificateInfo certificateInfo,
        IReadOnlyList<DeploymentTarget> selectedTargets,
        IProgress<TargetProgressUpdate>? progress,
        CancellationToken cancellationToken = default)
    {
        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(certificatePath)}");

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

        DateTimeOffset finishedAt = DateTimeOffset.Now;
        DeploymentRunResult runResult = new()
        {
            TargetResults = results,
            StartedAt = startedAt,
            FinishedAt = finishedAt,
            CertificateFilePath = certificatePath,
            CertificateFingerprint = certificateInfo.FingerprintSha256
        };

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

        // Ergebnis in SQL-Datenbank protokollieren (wenn ConnectionString konfiguriert)
        try
        {
            await _sqlRunLogger.PersistRunResultAsync(runResult, cancellationToken);
        }
        catch (Exception ex)
        {
            logger.Write($"SQL-Protokollierung fehlgeschlagen (nicht kritisch): {ex.Message}");
        }

        return runResult;
    }

    private async Task<TargetStepResult> RunTargetAsync(
        DeploymentTarget target,
        string certificatePath,
        CertificateInfo certificateInfo,
        RunLogger logger,
        IProgress<TargetProgressUpdate>? progress,
        CancellationToken cancellationToken)
    {
        List<string> steps = [];
        DateTimeOffset targetStart = DateTimeOffset.Now;
        progress?.Report(new TargetProgressUpdate(target.Id, "Läuft…", false));

        (bool copyOk, string copyStatus, string? copyDetail, _) =
            await _deployer.DeployAsync(certificatePath, target, cancellationToken);

        RecordStep(steps, logger, target.Name, "Deploy", copyStatus, copyDetail);
        if (!copyOk)
        {
            return Fail(target, copyStatus, copyDetail, steps, targetStart, progress);
        }

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

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

        RecordStep(steps, logger, target.Name, "Restart", restartStatus, restartDetail);
        if (!restartOk)
        {
            return Fail(target, restartStatus, restartDetail, steps, targetStart, progress,
                copySucceeded: copyOk);
        }

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

        (bool tlsOk, string tlsStatus, string? tlsDetail, string? observedFingerprint) = await _tlsProbe.ProbeAsync(
            target,
            certificateInfo.FingerprintSha256,
            cancellationToken);

        RecordStep(steps, logger, target.Name, "TLS", tlsStatus, tlsDetail);

        bool success = tlsOk;
        string finalStatus = success
            ? (string.IsNullOrWhiteSpace(target.TlsHost) ? "Erfolg" : tlsStatus)
            : tlsStatus;

        TargetStepResult targetResult = new()
        {
            TargetId = target.Id,
            TargetName = target.Name,
            Success = success,
            StatusText = finalStatus,
            Detail = tlsDetail,
            Steps = steps,
            StartedAt = targetStart,
            FinishedAt = DateTimeOffset.Now,
            CopySucceeded = copyOk,
            RestartSucceeded = restartOk,
            TlsSucceeded = tlsOk,
            ObservedFingerprint = observedFingerprint
        };
        progress?.Report(new TargetProgressUpdate(target.Id, finalStatus, success));
        return targetResult;
    }

    private static void RecordStep(
        List<string> steps,
        RunLogger logger,
        string targetName,
        string phase,
        string status,
        string? detail)
    {
        steps.Add($"{status}: {detail}");
        logger.Write($"[{targetName}] {phase}: {status} | {detail}");
    }

    private static TargetStepResult Fail(
        DeploymentTarget target,
        string status,
        string? detail,
        List<string> steps,
        DateTimeOffset startedAt,
        IProgress<TargetProgressUpdate>? progress,
        bool copySucceeded = false,
        bool restartSucceeded = false)
    {
        progress?.Report(new TargetProgressUpdate(target.Id, status, false));
        return new TargetStepResult
        {
            TargetId = target.Id,
            TargetName = target.Name,
            Success = false,
            StatusText = status,
            Detail = detail,
            Steps = steps,
            StartedAt = startedAt,
            FinishedAt = DateTimeOffset.Now,
            CopySucceeded = copySucceeded,
            RestartSucceeded = restartSucceeded,
            TlsSucceeded = false
        };
    }
}

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