using System;
using System.Collections.Generic;
using System.Windows.Forms;
using Microsoft.Extensions.DependencyInjection;
using PolyTrader.Core.Analytics;
using PolyTrader.Modules.Supervisor.Services;

namespace PolyTrader.Modules.Supervisor.Ui
{
    /// <summary>
    /// Hauptfenster des Supervisor-Moduls (S-1): Dossier-Browser — links die jüngsten Signale
    /// (aus dem Entscheidungsjournal), rechts das komplette Dossier (Markdown). Der Analyse-Chat
    /// (OpenRouter-Agent) folgt in S-2 als weiterer Tab. Code-only konstruiert (Muster RF-Modul);
    /// DB-Zugriffe defensiv, damit die UI auch bei leerer/nicht erreichbarer DB bedienbar bleibt.
    /// </summary>
    public sealed class SupervisorMainForm : Form
    {
        private DossierService? _dossiers;

        private readonly ToolStrip _toolStrip = new();
        private readonly ToolStripButton _btnRefresh = new() { Text = "Aktualisieren", DisplayStyle = ToolStripItemDisplayStyle.Text };
        private readonly ToolStripLabel _lblSearch = new() { Text = "SignalId:" };
        private readonly ToolStripTextBox _tbSignalId = new() { AutoSize = false, Width = 220 };
        private readonly ToolStripButton _btnOpen = new() { Text = "Dossier öffnen", DisplayStyle = ToolStripItemDisplayStyle.Text };

        private readonly SplitContainer _split = new() { Dock = DockStyle.Fill, SplitterDistance = 420 };
        private readonly DataGridView _grid = new()
        {
            Dock = DockStyle.Fill, ReadOnly = true, AllowUserToAddRows = false, AllowUserToDeleteRows = false,
            AutoGenerateColumns = true, SelectionMode = DataGridViewSelectionMode.FullRowSelect,
            RowHeadersVisible = false, MultiSelect = false
        };
        private readonly TextBox _dossierText = new()
        {
            Dock = DockStyle.Fill, Multiline = true, ReadOnly = true, ScrollBars = ScrollBars.Both,
            Font = new System.Drawing.Font("Consolas", 9.5f), WordWrap = false
        };
        private readonly Label _status = new() { Dock = DockStyle.Bottom, Height = 22, Padding = new Padding(6, 2, 6, 2), Text = "" };

        public SupervisorMainForm()
        {
            Text = "Supervisor";
            Width = 1250;
            Height = 700;
            StartPosition = FormStartPosition.CenterScreen;

            _toolStrip.Items.AddRange(new ToolStripItem[] { _btnRefresh, new ToolStripSeparator(), _lblSearch, _tbSignalId, _btnOpen });
            _split.Panel1.Controls.Add(_grid);
            _split.Panel2.Controls.Add(_dossierText);

            Controls.Add(_split);
            Controls.Add(_toolStrip);
            Controls.Add(_status);
            _toolStrip.Dock = DockStyle.Top;

            _btnRefresh.Click += (_, _) => LoadSignals();
            _btnOpen.Click += (_, _) => OpenDossier(_tbSignalId.Text.Trim());
            _grid.SelectionChanged += (_, _) => OpenSelected();
        }

        public void Initialize(IServiceProvider services)
        {
            _dossiers = services.GetRequiredService<DossierService>();
            LoadSignals();
        }

        private void LoadSignals()
        {
            if (_dossiers == null) return;
            try
            {
                List<SignalSummary> signals = _dossiers.RecentSignals(200);
                _grid.DataSource = signals;
                _status.Text = signals.Count == 0
                    ? "Noch keine Journal-Einträge (Entscheidungen entstehen, sobald Signale verarbeitet werden)."
                    : $"{signals.Count} Signale.";
            }
            catch (Exception ex)
            {
                _status.Text = $"Journal nicht lesbar: {ex.Message}";
            }
        }

        private void OpenSelected()
        {
            if (_grid.CurrentRow?.DataBoundItem is SignalSummary s)
                OpenDossier(s.SignalId);
        }

        private void OpenDossier(string signalId)
        {
            if (_dossiers == null || string.IsNullOrWhiteSpace(signalId)) return;
            try
            {
                var dossier = _dossiers.BuildForSignal(signalId);
                _dossierText.Text = DossierBuilder.ToMarkdown(dossier).Replace("\n", Environment.NewLine);
                _tbSignalId.Text = signalId;
            }
            catch (Exception ex)
            {
                _dossierText.Text = $"Dossier konnte nicht geladen werden: {ex.Message}";
            }
        }
    }
}