import { useEffect, useState } from 'react';
import { Settings, Zap, BookOpen, Grid3X3, Check } from 'lucide-react';
import axios from 'axios';

interface Indicator {
  id: string;
  name: string;
  periods?: number[];
  default_period?: number;
  description?: string;
  type: string;
}

interface IndicatorCategory {
  name: string;
  description: string;
  indicators: Indicator[];
}

interface Preset {
  id: string;
  name: string;
  indicators: string[];
  description: string;
}

export default function AdvancedIndicatorsPanel() {
  const [categories, setCategories] = useState<Record<string, IndicatorCategory>>({});
  const [presets, setPresets] = useState<Preset[]>([]);
  const [selectedIndicators, setSelectedIndicators] = useState<Set<string>>(new Set());
  const [activeTab, setActiveTab] = useState<'presets' | 'custom' | 'guide'>('presets');
  const [loading, setLoading] = useState(true);
  const [selectedPreset, setSelectedPreset] = useState<string | null>(null);
  const [cheatSheet, setCheatSheet] = useState<any>(null);

  // Fetch indicators and presets
  useEffect(() => {
    const fetchData = async () => {
      try {
        setLoading(true);

        // Fetch available indicators
        const indicatorsResponse = await axios.get('/api/indicators/available');
        setCategories(indicatorsResponse.data.categories || {});

        // Fetch presets
        const presetsResponse = await axios.get('/api/indicators/presets');
        setPresets(presetsResponse.data.presets || []);

        // Fetch cheat sheet
        const cheatSheetResponse = await axios.get('/api/indicators/cheat-sheet');
        setCheatSheet(cheatSheetResponse.data || {});
      } catch (error) {
        console.error('Error fetching indicators data:', error);
      } finally {
        setLoading(false);
      }
    };

    fetchData();
  }, []);

  const handleIndicatorToggle = (indicatorId: string) => {
    const newSet = new Set(selectedIndicators);
    if (newSet.has(indicatorId)) {
      newSet.delete(indicatorId);
    } else {
      newSet.add(indicatorId);
    }
    setSelectedIndicators(newSet);
  };

  const handlePresetSelect = (presetId: string) => {
    const preset = presets.find((p) => p.id === presetId);
    if (preset) {
      setSelectedIndicators(new Set(preset.indicators));
      setSelectedPreset(presetId);
    }
  };

  const getTypeColor = (type: string): string => {
    switch (type) {
      case 'trend':
        return 'bg-blue-900 text-blue-300';
      case 'momentum':
        return 'bg-purple-900 text-purple-300';
      case 'volatility':
        return 'bg-orange-900 text-orange-300';
      case 'level':
        return 'bg-green-900 text-green-300';
      case 'volume':
        return 'bg-pink-900 text-pink-300';
      default:
        return 'bg-gray-700 text-gray-300';
    }
  };

  if (loading) {
    return (
      <div className="card">
        <h3 className="text-lg font-semibold mb-4 flex items-center gap-2">
          <Settings className="w-5 h-5 text-blue-500" />
          Advanced Indicators
        </h3>
        <div className="text-center text-gray-400 py-8">Loading indicators...</div>
      </div>
    );
  }

  return (
    <div className="space-y-4">
      <div className="card">
        <div className="mb-6">
          <h3 className="text-lg font-semibold mb-4 flex items-center gap-2">
            <Settings className="w-5 h-5 text-blue-500" />
            Advanced Technical Indicators
          </h3>

          {/* Tabs */}
          <div className="flex gap-2 mb-4">
            <button
              onClick={() => setActiveTab('presets')}
              className={`px-4 py-2 rounded-lg font-medium transition ${
                activeTab === 'presets'
                  ? 'bg-blue-600 text-white'
                  : 'bg-dark-bg text-gray-400 hover:text-gray-200 border border-dark-border'
              }`}
            >
              <Zap className="w-4 h-4 inline mr-2" />
              Presets
            </button>
            <button
              onClick={() => setActiveTab('custom')}
              className={`px-4 py-2 rounded-lg font-medium transition ${
                activeTab === 'custom'
                  ? 'bg-blue-600 text-white'
                  : 'bg-dark-bg text-gray-400 hover:text-gray-200 border border-dark-border'
              }`}
            >
              <Grid3X3 className="w-4 h-4 inline mr-2" />
              Custom Setup ({selectedIndicators.size})
            </button>
            <button
              onClick={() => setActiveTab('guide')}
              className={`px-4 py-2 rounded-lg font-medium transition ${
                activeTab === 'guide'
                  ? 'bg-blue-600 text-white'
                  : 'bg-dark-bg text-gray-400 hover:text-gray-200 border border-dark-border'
              }`}
            >
              <BookOpen className="w-4 h-4 inline mr-2" />
              Quick Guide
            </button>
          </div>
        </div>

        {/* Presets Tab */}
        {activeTab === 'presets' && (
          <div className="space-y-3">
            {presets.map((preset) => (
              <div
                key={preset.id}
                onClick={() => handlePresetSelect(preset.id)}
                className={`p-4 rounded-lg border cursor-pointer transition ${
                  selectedPreset === preset.id
                    ? 'bg-blue-900 border-blue-500'
                    : 'bg-dark-bg border-dark-border hover:border-blue-500'
                }`}
              >
                <div className="flex items-start justify-between mb-2">
                  <div className="flex-1">
                    <h4 className="font-semibold text-gray-200 mb-1 flex items-center gap-2">
                      {preset.name}
                      {selectedPreset === preset.id && <Check className="w-4 h-4 text-green-500" />}
                    </h4>
                    <p className="text-sm text-gray-400">{preset.description}</p>
                  </div>
                  <span className="bg-blue-900 text-blue-300 text-xs px-2 py-1 rounded">
                    {preset.indicators.length} indicators
                  </span>
                </div>

                <div className="flex flex-wrap gap-1 mt-2">
                  {preset.indicators.map((ind) => (
                    <span key={ind} className="bg-gray-700 text-gray-300 text-xs px-2 py-1 rounded">
                      {ind}
                    </span>
                  ))}
                </div>
              </div>
            ))}
          </div>
        )}

        {/* Custom Setup Tab */}
        {activeTab === 'custom' && (
          <div className="space-y-4">
            {Object.entries(categories).map(([categoryKey, category]) => (
              <div key={categoryKey} className="bg-dark-bg rounded-lg p-4 border border-dark-border">
                <h4 className="font-semibold text-gray-200 mb-3 text-sm">
                  {category.name}
                </h4>
                <p className="text-xs text-gray-400 mb-3">{category.description}</p>

                <div className="space-y-2">
                  {category.indicators.map((indicator) => (
                    <label key={indicator.id} className="flex items-start gap-3 cursor-pointer">
                      <input
                        type="checkbox"
                        checked={selectedIndicators.has(indicator.id)}
                        onChange={() => handleIndicatorToggle(indicator.id)}
                        className="mt-1 w-4 h-4"
                      />
                      <div className="flex-1">
                        <p className="font-medium text-gray-200 text-sm">{indicator.name}</p>
                        <div className="flex gap-2 mt-1 flex-wrap">
                          <span className={`text-xs px-2 py-1 rounded ${getTypeColor(indicator.type)}`}>
                            {indicator.type}
                          </span>
                          {indicator.periods && indicator.default_period && (
                            <span className="text-xs bg-gray-700 text-gray-300 px-2 py-1 rounded">
                              Period: {indicator.default_period}
                            </span>
                          )}
                        </div>
                      </div>
                    </label>
                  ))}
                </div>
              </div>
            ))}

            {selectedIndicators.size > 0 && (
              <div className="bg-green-900 bg-opacity-20 border border-green-700 rounded-lg p-4">
                <h4 className="font-semibold text-green-400 mb-2">Configuration Ready</h4>
                <p className="text-sm text-gray-300 mb-3">
                  You've selected {selectedIndicators.size} indicator(s). Click below to apply.
                </p>
                <button className="w-full bg-green-600 hover:bg-green-700 text-white font-medium py-2 rounded-lg transition">
                  <Check className="w-4 h-4 inline mr-2" />
                  Apply Configuration
                </button>
              </div>
            )}
          </div>
        )}

        {/* Quick Guide Tab */}
        {activeTab === 'guide' && cheatSheet && (
          <div className="space-y-4">
            {Object.entries(cheatSheet).map(([key, value]) => (
              <div key={key} className="bg-dark-bg rounded-lg p-4 border border-dark-border">
                <h4 className="font-semibold text-gray-200 mb-3 capitalize">
                  {key.replace(/_/g, ' ')}
                </h4>
                <div className="space-y-2">
                  {typeof value === 'object' &&
                    !Array.isArray(value) &&
                    Object.entries(value).map(([subKey, subValue]) => (
                      <div key={subKey} className="text-sm">
                        <p className="font-medium text-blue-400">{subKey}</p>
                        <p className="text-gray-400 text-xs mt-1">{String(subValue)}</p>
                      </div>
                    ))}
                </div>
              </div>
            ))}
          </div>
        )}
      </div>

      {/* Selected Indicators Summary */}
      {selectedIndicators.size > 0 && activeTab !== 'guide' && (
        <div className="card bg-blue-900 bg-opacity-20 border border-blue-700">
          <h3 className="text-lg font-semibold mb-3 text-blue-400">Currently Selected</h3>
          <div className="flex flex-wrap gap-2">
            {Array.from(selectedIndicators).map((ind) => (
              <div
                key={ind}
                className="bg-blue-900 border border-blue-700 text-blue-300 text-sm px-3 py-2 rounded-lg flex items-center gap-2"
              >
                {ind}
                <button
                  onClick={() => {
                    const newSet = new Set(selectedIndicators);
                    newSet.delete(ind);
                    setSelectedIndicators(newSet);
                  }}
                  className="text-blue-400 hover:text-blue-200 font-bold"
                >
                  ×
                </button>
              </div>
            ))}
          </div>
        </div>
      )}

      {/* Indicator Types Legend */}
      <div className="card">
        <h3 className="font-semibold text-gray-300 mb-3 text-sm">Indicator Types</h3>
        <div className="grid grid-cols-2 md:grid-cols-3 gap-2">
          <div className="flex items-center gap-2">
            <div className="w-3 h-3 bg-blue-600 rounded-full"></div>
            <span className="text-xs text-gray-400">Trend</span>
          </div>
          <div className="flex items-center gap-2">
            <div className="w-3 h-3 bg-purple-600 rounded-full"></div>
            <span className="text-xs text-gray-400">Momentum</span>
          </div>
          <div className="flex items-center gap-2">
            <div className="w-3 h-3 bg-orange-600 rounded-full"></div>
            <span className="text-xs text-gray-400">Volatility</span>
          </div>
          <div className="flex items-center gap-2">
            <div className="w-3 h-3 bg-green-600 rounded-full"></div>
            <span className="text-xs text-gray-400">Support/Resistance</span>
          </div>
          <div className="flex items-center gap-2">
            <div className="w-3 h-3 bg-pink-600 rounded-full"></div>
            <span className="text-xs text-gray-400">Volume</span>
          </div>
        </div>
      </div>

      {/* Best Practices */}
      <div className="card bg-yellow-900 bg-opacity-20 border border-yellow-700">
        <h3 className="text-lg font-semibold mb-3 text-yellow-400">Pro Tips</h3>
        <ul className="space-y-2 text-sm text-gray-300">
          <li>✓ Use 2-3 indicators maximum to avoid signal conflicts</li>
          <li>✓ Combine different indicator types (trend + momentum + volatility)</li>
          <li>✓ Scalping: Use fast periods (5, 10, 14)</li>
          <li>✓ Swing/Position: Use standard periods (20, 50, 200)</li>
          <li>✓ Always confirm signals with price action and volume</li>
          <li>✓ Use presets as a starting point, customize based on your style</li>
        </ul>
      </div>
    </div>
  );
}