using IBKRTrader.Core.Time;
using IBKRTrader.Core.Logging;
using IBKRTrader.Core.Trading;
using IBKRTrader.Core.Workers;
using IBKRTrader.Modules.CongressTrading;
using IBKRTrader.Modules.CongressTrading.Database;

namespace IBKRTrader.UI.Views.Modules;

/// <summary>
/// Eigenständiges Fenster des CongressTrading-Moduls: DB-Kennzahlen, manueller Scrape-Trigger
/// und die offenen Positionen des Moduls (aus dem Core-Portfolio).
/// </summary>
public sealed class CongressTradingForm : Form
{
    private const string ScrapeWorkerName = "CT-ScrapeWorker";

    private readonly CongressRepository _repo;
    private readonly WorkerEngine       _engine;
    private readonly IPortfolioService  _portfolio;
    private readonly LoggingService     _logger;

    private readonly Label  _lblTrades  = new() { AutoSize = true, Location = new Point(20, 70) };
    private readonly Label  _lblMembers = new() { AutoSize = true, Location = new Point(20, 100) };
    private readonly Button _btnRefresh = new() { Text = "Aktualisieren", Location = new Point(20, 140), Width = 140 };
    private readonly Button _btnScrape  = new() { Text = "Scrape jetzt",  Location = new Point(170, 140), Width = 140 };
    private readonly Label  _lblStatus  = new() { AutoSize = true, Location = new Point(20, 185), ForeColor = SystemColors.GrayText };

    private readonly DataGridView _positions = new()
    {
        Location            = new Point(20, 250),
        Anchor              = AnchorStyles.Top | AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right,
        ReadOnly            = true,
        AllowUserToAddRows  = false,
        RowHeadersVisible   = false,
        AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill
    };

    public CongressTradingForm(CongressRepository repo, WorkerEngine engine, IPortfolioService portfolio, LoggingService logger)
    {
        _repo      = repo;
        _engine    = engine;
        _portfolio = portfolio;
        _logger    = logger;

        Text          = "Congress Trading [CT]";
        Width         = 900;
        Height        = 600;
        StartPosition = FormStartPosition.CenterScreen;
        MinimumSize   = new Size(600, 400);
        BuildLayout();
    }

    private void BuildLayout()
    {
        var title = new Label
        {
            Text     = "Congress Trading",
            Font     = new Font(Font.FontFamily, 14f, FontStyle.Bold),
            Location = new Point(18, 20),
            AutoSize = true
        };

        var posLabel = new Label
        {
            Text     = "Offene Positionen (Modul CT):",
            Location = new Point(20, 225),
            AutoSize = true
        };

        _positions.Size = new Size(ClientSize.Width - 40, ClientSize.Height - 270);

        _btnRefresh.Click += async (_, _) => await RefreshStatsAsync();
        _btnScrape.Click  += async (_, _) => await TriggerScrapeAsync();

        Controls.Add(title);
        Controls.Add(_lblTrades);
        Controls.Add(_lblMembers);
        Controls.Add(_btnRefresh);
        Controls.Add(_btnScrape);
        Controls.Add(_lblStatus);
        Controls.Add(posLabel);
        Controls.Add(_positions);
    }

    protected override async void OnShown(EventArgs e)
    {
        base.OnShown(e);
        await RefreshStatsAsync();
    }

    private async Task RefreshStatsAsync()
    {
        try
        {
            var trades  = await _repo.GetTradeCountAsync();
            var members = await _repo.GetMemberCountAsync();
            _lblTrades.Text  = $"Trades in DB: {trades:N0}";
            _lblMembers.Text = $"Mitglieder in DB: {members:N0}";

            var positions = await _portfolio.GetPositionsAsync(CongressTradingModule.LogTag);
            _positions.DataSource = positions
                .Select(p => new { p.Symbol, Stück = p.Quantity, Ø_Kurs = p.AvgPrice, Wert = p.Notional })
                .ToList();

            _lblStatus.Text  = $"Aktualisiert: {AppTimeZone.Now:HH:mm:ss}";
        }
        catch (Exception ex)
        {
            _lblTrades.Text  = "Trades in DB: n/v";
            _lblMembers.Text = "Mitglieder in DB: n/v";
            _lblStatus.Text  = $"DB nicht erreichbar: {ex.Message}";
            _logger.Warn(CongressTradingModule.LogTag, $"Kennzahlen konnten nicht geladen werden: {ex.Message}");
        }
    }

    private async Task TriggerScrapeAsync()
    {
        try
        {
            _lblStatus.Text = "Scrape angestoßen...";
            await _engine.TriggerWorkerAsync(ScrapeWorkerName);
            _logger.Info(CongressTradingModule.LogTag, "Scrape-Worker manuell ausgelöst (aus Modul-Fenster).");
        }
        catch (Exception ex)
        {
            _lblStatus.Text = $"Scrape fehlgeschlagen: {ex.Message}";
            _logger.Error(CongressTradingModule.LogTag, "Manueller Scrape-Trigger fehlgeschlagen.", ex);
        }
    }
}