using ZA.CoreService.ESBCertificateManager.Models;

namespace ZA.CoreService.ESBCertificateManager.Services;

/// <summary>
/// Dünne Fassade über die Sonic MfApi (wie SMC-Neustart).
/// </summary>
public sealed class SonicManagementClient : IDisposable
{
    private readonly SonicConnection _connection;
    private readonly SonicMfApiExecutor _mfApi;

    public SonicManagementClient(SonicConnection connection)
    {
        _connection = connection;
        _mfApi = new SonicMfApiExecutor(connection);
    }

    public async Task<(bool Reachable, string? Error, string? Detail)> CheckConnectionAsync(
        CancellationToken cancellationToken = default)
    {
        (bool ok, string? error) = await _mfApi.TestConnectionAsync(cancellationToken);
        if (ok)
        {
            return (true, null, $"MfApi {_connection.ConnectionUrl} Domain={_connection.DomainName}");
        }

        // Soft-Fallback: KnownContainers + TCP reichen für Discovery
        if (_connection.KnownContainers.Count > 0
            && await IsTcpReachableAsync(_connection.ConnectionUrl, cancellationToken))
        {
            return (true, null,
                $"MfApi-Ping fehlgeschlagen, KnownContainers/TCP ok. Hinweis: {Truncate(error)}");
        }

        return (false, error ?? "MfApi-Verbindung fehlgeschlagen", null);
    }

    public async Task<(bool Success, IReadOnlyList<string> ContainerNames, string? Error)> GetContainersAsync(
        CancellationToken cancellationToken = default)
    {
        (bool ok, IReadOnlyList<string> names, string? error) =
            await _mfApi.ListContainersAsync(cancellationToken);

        if (ok && names.Count > 0)
        {
            return (true, names, null);
        }

        if (_connection.KnownContainers.Count > 0)
        {
            return (true, _connection.KnownContainers, 
                ok ? null : $"Liste leer/fehlerhaft – KnownContainers. {error}");
        }

        return (false, [], error ?? "Keine Container gefunden.");
    }

    public async Task<(bool Success, string Status, string? Detail)> RestartContainerAsync(
        string containerName,
        CancellationToken cancellationToken = default)
    {
        (bool ok, string? output, string? error) =
            await _mfApi.RestartAsync(containerName, cancellationToken);

        if (ok)
        {
            await Task.Delay(
                TimeSpan.FromSeconds(Math.Clamp(_connection.PostRestartDelaySeconds, 0, 120)),
                cancellationToken);

            return (true, $"Container '{containerName}' neugestartet",
                $"Domain={_connection.DomainName}; URL={_connection.ConnectionUrl}\n{output}");
        }

        return (false, "Neustart fehlgeschlagen",
            $"Container '{containerName}', Domain '{_connection.DomainName}', URL {_connection.ConnectionUrl}\n" +
            $"Fehler: {error}\n\n{output}");
    }

    private static async Task<bool> IsTcpReachableAsync(string connectionUrl, CancellationToken cancellationToken)
    {
        try
        {
            Uri uri = new(connectionUrl);
            string host = uri.Host;
            int port = uri.Port > 0 ? uri.Port : 2506;
            using System.Net.Sockets.TcpClient tcp = new();
            using CancellationTokenSource cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
            cts.CancelAfter(TimeSpan.FromSeconds(5));
            await tcp.ConnectAsync(host, port, cts.Token);
            return true;
        }
        catch
        {
            return false;
        }
    }

    private static string Truncate(string? s, int max = 180)
        => string.IsNullOrWhiteSpace(s) ? string.Empty
            : s.Length <= max ? s : s[..max] + "…";

    public void Dispose()
    {
        // nichts zu dispose'n
    }
}