using ZA.CoreService.ESBCertificateManager.Models;

namespace ZA.CoreService.ESBCertificateManager.Services;

public sealed class SonicContainerDiscovery
{
    private readonly IReadOnlyList<SonicConnection> _connections;

    public SonicContainerDiscovery(IReadOnlyList<SonicConnection> connections)
    {
        _connections = connections;
    }

    public bool HasConnections => _connections.Count > 0;
    public IReadOnlyList<SonicConnection> Connections => _connections;

    public async Task<SonicDiscoveryResult> DiscoverAsync(
        string connectionName,
        IReadOnlyList<DeploymentTarget> knownTargets,
        CancellationToken cancellationToken = default)
    {
        SonicConnection? connection = _connections
            .FirstOrDefault(c => string.Equals(c.Name, connectionName, StringComparison.OrdinalIgnoreCase));

        if (connection is null)
        {
            return SonicDiscoveryResult.Failed(connectionName,
                $"Sonic-Verbindung '{connectionName}' fehlt in appsettings.");
        }

        using SonicManagementClient client = new(connection);
        (bool reachable, string? pingError, _) = await client.CheckConnectionAsync(cancellationToken);

        List<string> remoteContainers = [];
        List<string> diagnostics = [];

        if (!reachable)
        {
            diagnostics.Add($"Ping: {pingError}");
        }
        else
        {
            (bool listOk, IReadOnlyList<string> remoteNames, string? listError) =
                await client.GetContainersAsync(cancellationToken);
            if (listOk)
            {
                remoteContainers.AddRange(remoteNames.Where(n =>
                    !n.StartsWith("WARN:", StringComparison.OrdinalIgnoreCase)
                    && !n.StartsWith("INFO:", StringComparison.OrdinalIgnoreCase)));
            }
            else if (!string.IsNullOrWhiteSpace(listError))
            {
                diagnostics.Add(listError);
            }
        }

        List<string> merged = [];
        foreach (string name in remoteContainers
                     .Concat(connection.KnownContainers)
                     .Concat(knownTargets
                         .Where(t => string.Equals(t.SonicConnectionName, connection.Name, StringComparison.OrdinalIgnoreCase))
                         .Select(t => t.ContainerName))
                     .Where(n => !string.IsNullOrWhiteSpace(n)))
        {
            if (!merged.Any(m => string.Equals(m, name, StringComparison.OrdinalIgnoreCase)))
            {
                merged.Add(name);
            }
        }

        if (merged.Count == 0)
        {
            return SonicDiscoveryResult.Failed(connectionName,
                string.Join(" | ", diagnostics.DefaultIfEmpty("Keine Container gefunden.")));
        }

        int id = 1;
        List<DeploymentTarget> targets = merged.Select(name =>
        {
            DeploymentTarget? known = knownTargets.FirstOrDefault(t =>
                string.Equals(t.ContainerName, name, StringComparison.OrdinalIgnoreCase)
                && string.Equals(t.SonicConnectionName, connection.Name, StringComparison.OrdinalIgnoreCase));

            return new DeploymentTarget
            {
                Id = known?.Id ?? id++,
                Name = known?.Name ?? $"{connection.Name} / {name}",
                Environment = known?.Environment ?? "TEST",
                IsActive = true,
                ContainerName = name,
                SonicConnectionName = connection.Name,
                SortOrder = known?.SortOrder ?? id * 10
            };
        }).ToList();

        return new SonicDiscoveryResult
        {
            ConnectionName = connectionName,
            DomainName = connection.DomainName,
            Success = true,
            ErrorMessage = diagnostics.Count == 0 ? null : string.Join(" | ", diagnostics),
            DiscoveredTargets = targets,
            RawContainerNames = remoteContainers
        };
    }
}

public sealed class SonicDiscoveryResult
{
    public required string ConnectionName { get; init; }
    public string DomainName { get; init; } = string.Empty;
    public bool Success { get; init; }
    public string? ErrorMessage { get; init; }
    public IReadOnlyList<DeploymentTarget> DiscoveredTargets { get; init; } = [];
    public IReadOnlyList<string> RawContainerNames { get; init; } = [];

    public static SonicDiscoveryResult Failed(string connectionName, string error)
        => new()
        {
            ConnectionName = connectionName,
            Success = false,
            ErrorMessage = error
        };
}