/**
 * QuickOrderPanel Component
 * Compact order entry for fast one-click trading
 */

import React, { useState, useCallback } from 'react';
import {
  TrendingUp,
  TrendingDown,
  Loader2,
  Settings,
  Zap,
  AlertTriangle,
  Check,
} from 'lucide-react';
import { executeMT4Trade } from '../../../services/trading.service';

interface QuickOrderPanelProps {
  symbol: string;
  currentPrice: number;
  spread?: number;
  accountBalance?: number;
  onOrderExecuted?: (ticket: number, type: 'buy' | 'sell') => void;
  onError?: (error: string) => void;
  compact?: boolean;
}

interface LotPreset {
  label: string;
  lots: number;
}

const DEFAULT_PRESETS: LotPreset[] = [
  { label: '0.01', lots: 0.01 },
  { label: '0.05', lots: 0.05 },
  { label: '0.10', lots: 0.10 },
  { label: '0.25', lots: 0.25 },
  { label: '0.50', lots: 0.50 },
  { label: '1.00', lots: 1.00 },
];

const QuickOrderPanel: React.FC<QuickOrderPanelProps> = ({
  symbol,
  currentPrice,
  spread = 0,
  accountBalance = 0,
  onOrderExecuted,
  onError,
  compact = false,
}) => {
  const [selectedLots, setSelectedLots] = useState<number>(0.01);
  const [customLots, setCustomLots] = useState<string>('');
  const [isExecuting, setIsExecuting] = useState<'buy' | 'sell' | null>(null);
  const [lastResult, setLastResult] = useState<{ type: 'success' | 'error'; message: string } | null>(null);
  const [showSettings, setShowSettings] = useState(false);
  const [slPips, setSlPips] = useState<number>(20);
  const [tpPips, setTpPips] = useState<number>(40);
  const [useSLTP, setUseSLTP] = useState(true);

  const activeLots = customLots ? parseFloat(customLots) : selectedLots;
  const bidPrice = currentPrice - spread / 2;
  const askPrice = currentPrice + spread / 2;

  // Calculate pip value (simplified - assumes forex major pairs)
  const pipValue = symbol.includes('JPY') ? 0.01 : 0.0001;

  const calculateSLTP = (type: 'buy' | 'sell') => {
    const price = type === 'buy' ? askPrice : bidPrice;
    if (!useSLTP) return { sl: undefined, tp: undefined };

    if (type === 'buy') {
      return {
        sl: price - slPips * pipValue,
        tp: price + tpPips * pipValue,
      };
    } else {
      return {
        sl: price + slPips * pipValue,
        tp: price - tpPips * pipValue,
      };
    }
  };

  const estimateRisk = () => {
    if (!accountBalance || !useSLTP) return null;
    // Rough estimate: lot * pip value * SL pips
    const riskPerPip = activeLots * 10; // ~$10 per pip per lot for majors
    const totalRisk = riskPerPip * slPips;
    const riskPercent = (totalRisk / accountBalance) * 100;
    return { totalRisk, riskPercent };
  };

  const risk = estimateRisk();

  const executeOrder = useCallback(async (type: 'buy' | 'sell') => {
    if (isExecuting || activeLots <= 0) return;

    setIsExecuting(type);
    setLastResult(null);

    try {
      const { sl, tp } = calculateSLTP(type);

      const result = await executeMT4Trade({
        symbol,
        type: type === 'buy' ? 'BUY' : 'SELL',
        lots: activeLots,
        stopLoss: sl,
        takeProfit: tp,
      });

      setLastResult({ type: 'success', message: `#${result.ticket} ${type.toUpperCase()} ${activeLots} lots` });
      onOrderExecuted?.(result.ticket, type);

      // Clear success message after 3 seconds
      setTimeout(() => setLastResult(null), 3000);
    } catch (err) {
      const errorMessage = err instanceof Error ? err.message : 'Order failed';
      setLastResult({ type: 'error', message: errorMessage });
      onError?.(errorMessage);
    } finally {
      setIsExecuting(null);
    }
  }, [symbol, activeLots, useSLTP, slPips, tpPips, askPrice, bidPrice, onOrderExecuted, onError]);

  if (compact) {
    return (
      <div className="flex items-center gap-2 p-2 bg-gray-800/50 rounded-lg">
        <span className="text-sm font-mono text-gray-400">{symbol}</span>
        <select
          value={selectedLots}
          onChange={(e) => setSelectedLots(parseFloat(e.target.value))}
          className="px-2 py-1 bg-gray-900 border border-gray-700 rounded text-sm text-white"
        >
          {DEFAULT_PRESETS.map((preset) => (
            <option key={preset.lots} value={preset.lots}>{preset.label}</option>
          ))}
        </select>
        <button
          onClick={() => executeOrder('buy')}
          disabled={!!isExecuting}
          className="px-3 py-1 bg-green-600 hover:bg-green-500 text-white rounded text-sm font-medium disabled:opacity-50"
        >
          {isExecuting === 'buy' ? <Loader2 className="w-4 h-4 animate-spin" /> : 'BUY'}
        </button>
        <button
          onClick={() => executeOrder('sell')}
          disabled={!!isExecuting}
          className="px-3 py-1 bg-red-600 hover:bg-red-500 text-white rounded text-sm font-medium disabled:opacity-50"
        >
          {isExecuting === 'sell' ? <Loader2 className="w-4 h-4 animate-spin" /> : 'SELL'}
        </button>
      </div>
    );
  }

  return (
    <div className="p-4 bg-gray-800/50 rounded-xl border border-gray-700">
      {/* Header */}
      <div className="flex items-center justify-between mb-4">
        <div className="flex items-center gap-2">
          <Zap className="w-5 h-5 text-yellow-400" />
          <h3 className="font-semibold text-white">Quick Order</h3>
        </div>
        <button
          onClick={() => setShowSettings(!showSettings)}
          className={`p-1.5 rounded-lg transition-colors ${
            showSettings ? 'bg-blue-600 text-white' : 'text-gray-400 hover:text-white hover:bg-gray-700'
          }`}
        >
          <Settings className="w-4 h-4" />
        </button>
      </div>

      {/* Symbol & Price */}
      <div className="text-center mb-4">
        <div className="text-lg font-bold text-white">{symbol}</div>
        <div className="flex items-center justify-center gap-4 mt-1">
          <span className="text-red-400 font-mono">{bidPrice.toFixed(5)}</span>
          <span className="text-xs text-gray-500">|</span>
          <span className="text-green-400 font-mono">{askPrice.toFixed(5)}</span>
        </div>
        {spread > 0 && (
          <div className="text-xs text-gray-500 mt-1">
            Spread: {(spread / pipValue).toFixed(1)} pips
          </div>
        )}
      </div>

      {/* Lot Size Presets */}
      <div className="mb-4">
        <label className="block text-xs text-gray-400 mb-2">Lot Size</label>
        <div className="grid grid-cols-6 gap-1">
          {DEFAULT_PRESETS.map((preset) => (
            <button
              key={preset.lots}
              onClick={() => {
                setSelectedLots(preset.lots);
                setCustomLots('');
              }}
              className={`py-1.5 text-xs font-medium rounded transition-colors ${
                selectedLots === preset.lots && !customLots
                  ? 'bg-blue-600 text-white'
                  : 'bg-gray-700 text-gray-300 hover:bg-gray-600'
              }`}
            >
              {preset.label}
            </button>
          ))}
        </div>
        <input
          type="number"
          value={customLots}
          onChange={(e) => setCustomLots(e.target.value)}
          placeholder="Custom lots..."
          step="0.01"
          min="0.01"
          className="w-full mt-2 px-3 py-2 bg-gray-900 border border-gray-700 rounded-lg text-white text-sm placeholder-gray-500 focus:outline-none focus:border-blue-500"
        />
      </div>

      {/* Settings Panel */}
      {showSettings && (
        <div className="mb-4 p-3 bg-gray-900/50 rounded-lg space-y-3">
          <label className="flex items-center gap-2 cursor-pointer">
            <input
              type="checkbox"
              checked={useSLTP}
              onChange={(e) => setUseSLTP(e.target.checked)}
              className="w-4 h-4 rounded border-gray-600 bg-gray-900 text-blue-600"
            />
            <span className="text-sm text-gray-300">Auto SL/TP</span>
          </label>

          {useSLTP && (
            <div className="grid grid-cols-2 gap-3">
              <div>
                <label className="block text-xs text-gray-400 mb-1">SL (pips)</label>
                <input
                  type="number"
                  value={slPips}
                  onChange={(e) => setSlPips(parseInt(e.target.value) || 0)}
                  className="w-full px-2 py-1.5 bg-gray-800 border border-gray-700 rounded text-sm text-white"
                />
              </div>
              <div>
                <label className="block text-xs text-gray-400 mb-1">TP (pips)</label>
                <input
                  type="number"
                  value={tpPips}
                  onChange={(e) => setTpPips(parseInt(e.target.value) || 0)}
                  className="w-full px-2 py-1.5 bg-gray-800 border border-gray-700 rounded text-sm text-white"
                />
              </div>
            </div>
          )}
        </div>
      )}

      {/* Risk Warning */}
      {risk && risk.riskPercent > 2 && (
        <div className="flex items-center gap-2 p-2 mb-4 bg-yellow-500/10 border border-yellow-500/30 rounded-lg">
          <AlertTriangle className="w-4 h-4 text-yellow-400 flex-shrink-0" />
          <span className="text-xs text-yellow-400">
            Risk: ${risk.totalRisk.toFixed(2)} ({risk.riskPercent.toFixed(1)}% of balance)
          </span>
        </div>
      )}

      {/* Buy/Sell Buttons */}
      <div className="grid grid-cols-2 gap-3">
        <button
          onClick={() => executeOrder('sell')}
          disabled={!!isExecuting || activeLots <= 0}
          className="flex flex-col items-center gap-1 py-3 bg-red-600 hover:bg-red-500 text-white rounded-lg font-medium transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
        >
          {isExecuting === 'sell' ? (
            <Loader2 className="w-5 h-5 animate-spin" />
          ) : (
            <>
              <TrendingDown className="w-5 h-5" />
              <span>SELL</span>
              <span className="text-xs opacity-75">{bidPrice.toFixed(5)}</span>
            </>
          )}
        </button>
        <button
          onClick={() => executeOrder('buy')}
          disabled={!!isExecuting || activeLots <= 0}
          className="flex flex-col items-center gap-1 py-3 bg-green-600 hover:bg-green-500 text-white rounded-lg font-medium transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
        >
          {isExecuting === 'buy' ? (
            <Loader2 className="w-5 h-5 animate-spin" />
          ) : (
            <>
              <TrendingUp className="w-5 h-5" />
              <span>BUY</span>
              <span className="text-xs opacity-75">{askPrice.toFixed(5)}</span>
            </>
          )}
        </button>
      </div>

      {/* Result Message */}
      {lastResult && (
        <div className={`flex items-center gap-2 mt-3 p-2 rounded-lg ${
          lastResult.type === 'success'
            ? 'bg-green-500/10 border border-green-500/30'
            : 'bg-red-500/10 border border-red-500/30'
        }`}>
          {lastResult.type === 'success' ? (
            <Check className="w-4 h-4 text-green-400" />
          ) : (
            <AlertTriangle className="w-4 h-4 text-red-400" />
          )}
          <span className={`text-xs ${
            lastResult.type === 'success' ? 'text-green-400' : 'text-red-400'
          }`}>
            {lastResult.message}
          </span>
        </div>
      )}

      {/* Active Lots Display */}
      <div className="mt-3 text-center text-xs text-gray-500">
        Trading <span className="text-white font-medium">{activeLots.toFixed(2)}</span> lots
      </div>
    </div>
  );
};

export default QuickOrderPanel;
