using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Windows.Forms;
using PolyTrader.Modules.CopyTrading.Logic;
using PolyTrader.Modules.CopyTrading.Persistence;
using PolyTraderSharp;
using PolyTraderSharp.Models;

namespace PolyTrader.Modules.CopyTrading.Ui
{
    /// <summary>
    /// Zeigt die geschlossenen Copytrades des Moduls (mod_copytrading_closed_trades) mit
    /// aufgelösten Account-/Master-Trader-Namen und einer Kurzauswertung.
    /// Layout im Designer (ClosedTradesView.Designer.cs), Daten/Logik hier.
    /// </summary>
    public partial class ClosedTradesView : UserControl
    {
        private ICopyTradeLogRepository? _tradeLog;
        private TradingState? _state;
        private CopyTradingState? _copyState;

        private List<ClosedTradeRow> _allRows = new();
        private bool _loading;

        // Parameterloser Konstruktor für den WinForms-Designer.
        public ClosedTradesView()
        {
            InitializeComponent();

            colEntry.DefaultCellStyle.Format = "F3";
            colExit.DefaultCellStyle.Format = "F3";
            colSize.DefaultCellStyle.Format = "F2";
            colPnl.DefaultCellStyle.Format = "F2";
            colPnlPct.DefaultCellStyle.Format = "F1";
            colOpenedAt.DefaultCellStyle.Format = "dd.MM.yyyy HH:mm";
            colClosedAt.DefaultCellStyle.Format = "dd.MM.yyyy HH:mm";

            tsRefresh.Click += (_, _) => LoadData();

            // Zeilenfärbung nach PnL-% (grün/hellgrün/rot) nach jedem (Neu-)Binden.
            dgvTrades.DataBindingComplete += (_, _) => ColorRows();

            // Filter: Markt (Text), Master (Combo), Ergebnis (Win/Loss), Datum (Von/Bis, optional).
            tbMarket.TextChanged += (_, _) => ApplyFilter();
            cbMaster.SelectedIndexChanged += (_, _) => ApplyFilter();
            cbResult.SelectedIndexChanged += (_, _) => ApplyFilter();
            dtFrom.ValueChanged += (_, _) => ApplyFilter();
            dtTo.ValueChanged += (_, _) => ApplyFilter();
            btnReset.Click += (_, _) => ResetFilters();
            if (cbResult.Items.Count > 0) cbResult.SelectedIndex = 0;
        }

        /// <summary>Injiziert die Abhängigkeiten (nach der DI-Auflösung) und lädt die Daten.</summary>
        public void Initialize(ICopyTradeLogRepository tradeLog, TradingState state, CopyTradingState copyState)
        {
            _tradeLog = tradeLog;
            _state = state;
            _copyState = copyState;
            LoadData();
        }

        private void LoadData()
        {
            if (_tradeLog == null) return;

            _allRows = _tradeLog.Find(_ => true)
                .OrderByDescending(t => t.ClosedAt)
                .Select(t => new ClosedTradeRow
                {
                    TradeId = t.TradeId,
                    AccountId = t.AccountId,
                    SourceTraderId = t.SourceTraderId,
                    IsDemo = t.IsDemo,
                    TokenId = t.TokenId,
                    MarketSlug = t.MarketSlug,
                    MarketQuestion = t.MarketQuestion,
                    Outcome = t.Outcome,
                    Side = t.Side,
                    EntryPrice = t.EntryPrice,
                    ExitPrice = t.ExitPrice,
                    Size = t.Size,
                    RealizedPnl = t.RealizedPnl,
                    PnlPercent = t.PnlPercent,
                    TotalFees = t.TotalFees,
                    OpenedAt = t.OpenedAt,
                    ClosedAt = t.ClosedAt,
                    ExitReason = t.ExitReason,
                    AccountName = ResolveAccount(t.AccountId, t.IsDemo),
                    SourceTraderName = ResolveTrader(t.SourceTraderId)
                })
                .ToList();

            PopulateMasters();
            ApplyFilter();
        }

        private void PopulateMasters()
        {
            _loading = true;
            string prev = cbMaster.SelectedItem as string ?? "Alle";
            cbMaster.Items.Clear();
            cbMaster.Items.Add("Alle");
            foreach (var m in _allRows.Select(r => r.SourceTraderName)
                         .Where(s => !string.IsNullOrEmpty(s)).Distinct().OrderBy(s => s))
                cbMaster.Items.Add(m);
            int idx = cbMaster.Items.IndexOf(prev);
            cbMaster.SelectedIndex = idx >= 0 ? idx : 0;
            _loading = false;
        }

        private void ApplyFilter()
        {
            if (_loading) return;

            IEnumerable<ClosedTradeRow> q = _allRows;

            string market = tbMarket.Text.Trim();
            if (market.Length > 0)
                q = q.Where(r => (r.MarketQuestion?.Contains(market, StringComparison.OrdinalIgnoreCase) ?? false)
                              || (r.MarketSlug?.Contains(market, StringComparison.OrdinalIgnoreCase) ?? false));

            if (cbMaster.SelectedItem is string master && master != "Alle")
                q = q.Where(r => r.SourceTraderName == master);

            string result = cbResult.SelectedItem as string ?? "Alle";
            if (result == "Gewinner") q = q.Where(r => r.RealizedPnl > 0m);
            else if (result == "Verlierer") q = q.Where(r => r.RealizedPnl < 0m);

            if (dtFrom.Checked) { DateTime f = dtFrom.Value.Date; q = q.Where(r => r.ClosedAt >= f); }
            if (dtTo.Checked) { DateTime t = dtTo.Value.Date.AddDays(1).AddTicks(-1); q = q.Where(r => r.ClosedAt <= t); }

            var rows = q.ToList();
            dgvTrades.DataSource = new BindingList<ClosedTradeRow>(rows);

            decimal totalPnl = rows.Sum(x => x.RealizedPnl);
            int wins = rows.Count(x => x.RealizedPnl > 0);
            double winrate = rows.Count > 0 ? (double)wins / rows.Count * 100 : 0;
            lblSummary.Text = $"{rows.Count} / {_allRows.Count} Trades   |   PnL: {totalPnl:F2} USDC   |   Winrate: {winrate:F1}%";
        }

        private void ResetFilters()
        {
            _loading = true;
            tbMarket.Text = string.Empty;
            if (cbMaster.Items.Count > 0) cbMaster.SelectedIndex = 0;
            if (cbResult.Items.Count > 0) cbResult.SelectedIndex = 0;
            dtFrom.Checked = false;
            dtTo.Checked = false;
            _loading = false;
            ApplyFilter();
        }

        private void ColorRows()
        {
            foreach (DataGridViewRow row in dgvTrades.Rows)
                if (row.DataBoundItem is ClosedTradeRow r)
                    row.DefaultCellStyle.BackColor = TradeRowColoring.ForPnlPercent(r.PnlPercent);
        }

        private string ResolveAccount(int accountId, bool isDemo)
        {
            string suffix = isDemo ? " (Demo)" : "";
            if (_state != null && _state.Accounts.TryGetValue(accountId, out var acc) && !string.IsNullOrEmpty(acc.Name))
                return acc.Name + suffix;
            return $"#{accountId}{suffix}";
        }

        private string ResolveTrader(int traderId)
        {
            if (_copyState != null && _copyState.Traders.TryGetValue(traderId, out var t) && !string.IsNullOrEmpty(t.DisplayName))
                return t.DisplayName;
            return traderId > 0 ? $"#{traderId}" : "Unbekannt";
        }
    }
}