import React, { useState, useEffect } from 'react';
import { useAuth } from '../contexts/AuthContext';

interface UserPreferences {
  defaultView: string;
  itemsPerPage: number;
  enableAnimations: boolean;
  enableOcr: boolean;
  theme: string;
  privacySettings: {
    collections_public: boolean;
    decks_public: boolean;
  };
  ocrSettings: {
    preferred_service: 'openai' | 'ollama';
    openai_api_key: string;
    ollama_url: string;
    auto_add_to_collection: boolean;
    confidence_threshold: number;
  };
}

const Settings: React.FC = () => {
  const { user } = useAuth();
  const [preferences, setPreferences] = useState<UserPreferences | null>(null);
  const [isLoading, setIsLoading] = useState(true);
  const [isSaving, setIsSaving] = useState(false);
  const [message, setMessage] = useState<{ type: 'success' | 'error'; text: string } | null>(null);
  const [activeTab, setActiveTab] = useState('general');
  const [isTestingOpenAI, setIsTestingOpenAI] = useState(false);
  const [isTestingOllama, setIsTestingOllama] = useState(false);
  const [testResults, setTestResults] = useState<{ openai?: string; ollama?: string }>({});

  useEffect(() => {
    loadPreferences();
  }, [user]); // eslint-disable-line react-hooks/exhaustive-deps

  const loadPreferences = async () => {
    if (!user) return;

    try {
      const token = localStorage.getItem('tcg_vault_token');
      const response = await fetch('/api/user/preferences', {
        headers: {
          'Authorization': `Bearer ${token}`,
          'Content-Type': 'application/json'
        }
      });

      if (response.ok) {
        const data = await response.json();
        setPreferences(data.preferences);
      } else {
        setMessage({ type: 'error', text: 'Failed to load preferences' });
      }
    } catch (error) {
      console.error('Error loading preferences:', error);
      setMessage({ type: 'error', text: 'Error loading preferences' });
    } finally {
      setIsLoading(false);
    }
  };

  const savePreferences = async () => {
    if (!preferences) return;

    setIsSaving(true);
    try {
      const token = localStorage.getItem('tcg_vault_token');
      const response = await fetch('/api/user/preferences', {
        method: 'PUT',
        headers: {
          'Authorization': `Bearer ${token}`,
          'Content-Type': 'application/json'
        },
        body: JSON.stringify(preferences)
      });

      const data = await response.json();
      
      if (response.ok) {
        setMessage({ type: 'success', text: 'Settings saved successfully!' });
        setPreferences(data.preferences);
      } else {
        setMessage({ type: 'error', text: data.error || 'Failed to save settings' });
      }
    } catch (error) {
      console.error('Error saving preferences:', error);
      setMessage({ type: 'error', text: 'Error saving settings' });
    } finally {
      setIsSaving(false);
    }
  };

  const testOpenAI = async () => {
    if (!preferences?.ocrSettings.openai_api_key) {
      setTestResults(prev => ({ ...prev, openai: '❌ API key required' }));
      return;
    }

    setIsTestingOpenAI(true);
    try {
      const response = await fetch('https://api.openai.com/v1/models', {
        headers: {
          'Authorization': `Bearer ${preferences.ocrSettings.openai_api_key}`,
        },
      });

      if (response.ok) {
        setTestResults(prev => ({ ...prev, openai: '✅ API key valid' }));
      } else {
        setTestResults(prev => ({ ...prev, openai: `❌ API error: ${response.status}` }));
      }
    } catch (error: any) {
      setTestResults(prev => ({ ...prev, openai: `❌ Connection failed: ${error.message}` }));
    } finally {
      setIsTestingOpenAI(false);
    }
  };

  const testOllama = async () => {
    if (!preferences?.ocrSettings.ollama_url) return;

    setIsTestingOllama(true);
    try {
      const response = await fetch(`${preferences.ocrSettings.ollama_url}/api/tags`);
      if (response.ok) {
        const data = await response.json();
        const hasVisionModel = data.models?.some((model: any) => 
          model.name.includes('llava') || model.name.includes('vision')
        );
        
        if (hasVisionModel) {
          setTestResults(prev => ({ ...prev, ollama: '✅ Ollama with vision models available' }));
        } else {
          setTestResults(prev => ({ ...prev, ollama: '⚠️ Ollama running but no vision models found' }));
        }
      } else {
        setTestResults(prev => ({ ...prev, ollama: `❌ Ollama error: ${response.status}` }));
      }
    } catch (error: any) {
      setTestResults(prev => ({ ...prev, ollama: `❌ Cannot reach Ollama: ${error.message}` }));
    } finally {
      setIsTestingOllama(false);
    }
  };

  const updatePreference = (key: keyof UserPreferences, value: any) => {
    if (!preferences) return;
    setPreferences({ ...preferences, [key]: value });
  };

  const updateOcrSetting = (key: keyof UserPreferences['ocrSettings'], value: any) => {
    if (!preferences) return;
    setPreferences({
      ...preferences,
      ocrSettings: { ...preferences.ocrSettings, [key]: value }
    });
  };

  if (isLoading) {
    return (
      <div className="flex items-center justify-center min-h-screen">
        <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-indigo-600"></div>
      </div>
    );
  }

  if (!preferences) {
    return (
      <div className="text-center py-8">
        <p className="text-red-600">Failed to load preferences</p>
        <button onClick={loadPreferences} className="mt-4 text-indigo-600 hover:underline">
          Try Again
        </button>
      </div>
    );
  }

  return (
    <div className="max-w-4xl mx-auto p-6">
      <div className="mb-8">
        <h1 className="text-3xl font-bold text-gray-900 mb-2">Settings</h1>
        <p className="text-gray-600">Manage your account preferences and OCR configuration</p>
      </div>

      {/* Message Display */}
      {message && (
        <div className={`mb-6 p-4 rounded-lg ${
          message.type === 'success' ? 'bg-green-50 text-green-800 border border-green-200' : 
          'bg-red-50 text-red-800 border border-red-200'
        }`}>
          {message.text}
        </div>
      )}

      {/* Tab Navigation */}
      <div className="border-b border-gray-200 mb-6">
        <nav className="-mb-px flex space-x-8">
          {[
            { id: 'general', label: 'General', icon: '⚙️' },
            { id: 'ocr', label: 'AI OCR', icon: '🤖' },
            { id: 'privacy', label: 'Privacy', icon: '🔒' }
          ].map(tab => (
            <button
              key={tab.id}
              onClick={() => setActiveTab(tab.id)}
              className={`py-2 px-1 border-b-2 font-medium text-sm ${
                activeTab === tab.id
                  ? 'border-indigo-500 text-indigo-600'
                  : 'border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300'
              }`}
            >
              <span className="mr-2">{tab.icon}</span>
              {tab.label}
            </button>
          ))}
        </nav>
      </div>

      {/* Tab Content */}
      <div className="space-y-6">
        {activeTab === 'general' && (
          <div className="bg-white rounded-lg border border-gray-200 p-6">
            <h3 className="text-lg font-medium mb-4">General Preferences</h3>
            
            <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Default View
                </label>
                <select
                  value={preferences.defaultView}
                  onChange={(e) => updatePreference('defaultView', e.target.value)}
                  className="w-full px-3 py-2 border border-gray-300 rounded-md focus:ring-indigo-500 focus:border-indigo-500"
                >
                  <option value="card">Card View</option>
                  <option value="table">Table View</option>
                </select>
              </div>

              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Items per Page
                </label>
                <select
                  value={preferences.itemsPerPage}
                  onChange={(e) => updatePreference('itemsPerPage', parseInt(e.target.value))}
                  className="w-full px-3 py-2 border border-gray-300 rounded-md focus:ring-indigo-500 focus:border-indigo-500"
                >
                  <option value={10}>10</option>
                  <option value={20}>20</option>
                  <option value={50}>50</option>
                  <option value={100}>100</option>
                </select>
              </div>

              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Theme
                </label>
                <select
                  value={preferences.theme}
                  onChange={(e) => updatePreference('theme', e.target.value)}
                  className="w-full px-3 py-2 border border-gray-300 rounded-md focus:ring-indigo-500 focus:border-indigo-500"
                >
                  <option value="light">Light</option>
                  <option value="dark">Dark</option>
                  <option value="system">System</option>
                </select>
              </div>

              <div className="space-y-3">
                <label className="flex items-center">
                  <input
                    type="checkbox"
                    checked={preferences.enableAnimations}
                    onChange={(e) => updatePreference('enableAnimations', e.target.checked)}
                    className="rounded border-gray-300 text-indigo-600 focus:ring-indigo-500"
                  />
                  <span className="ml-2 text-sm text-gray-700">Enable animations</span>
                </label>

                <label className="flex items-center">
                  <input
                    type="checkbox"
                    checked={preferences.enableOcr}
                    onChange={(e) => updatePreference('enableOcr', e.target.checked)}
                    className="rounded border-gray-300 text-indigo-600 focus:ring-indigo-500"
                  />
                  <span className="ml-2 text-sm text-gray-700">Enable OCR scanning</span>
                </label>
              </div>
            </div>
          </div>
        )}

        {activeTab === 'ocr' && (
          <div className="bg-white rounded-lg border border-gray-200 p-6">
            <h3 className="text-lg font-medium mb-4">AI OCR Configuration</h3>
            
            {/* Service Selection */}
            <div className="mb-6">
              <label className="block text-sm font-medium text-gray-700 mb-3">
                Preferred OCR Service
              </label>
              <div className="space-y-2">
                <label className="flex items-center">
                  <input
                    type="radio"
                    value="openai"
                    checked={preferences.ocrSettings.preferred_service === 'openai'}
                    onChange={(e) => updateOcrSetting('preferred_service', e.target.value as 'openai')}
                    className="text-indigo-600 focus:ring-indigo-500"
                  />
                  <span className="ml-2 text-sm text-gray-700">OpenAI Vision API (Recommended)</span>
                </label>
                <label className="flex items-center">
                  <input
                    type="radio"
                    value="ollama"
                    checked={preferences.ocrSettings.preferred_service === 'ollama'}
                    onChange={(e) => updateOcrSetting('preferred_service', e.target.value as 'ollama')}
                    className="text-indigo-600 focus:ring-indigo-500"
                  />
                  <span className="ml-2 text-sm text-gray-700">Ollama (Local/Private)</span>
                </label>
              </div>
            </div>

            {/* OpenAI Settings */}
            <div className="border rounded-lg p-4 mb-6">
              <h4 className="font-medium text-gray-900 mb-3">OpenAI Configuration</h4>
              <div className="space-y-3">
                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">
                    API Key
                  </label>
                  <input
                    type="password"
                    value={preferences.ocrSettings.openai_api_key}
                    onChange={(e) => updateOcrSetting('openai_api_key', e.target.value)}
                    placeholder="sk-..."
                    className="w-full px-3 py-2 border border-gray-300 rounded-md focus:ring-indigo-500 focus:border-indigo-500"
                  />
                  <p className="text-xs text-gray-500 mt-1">
                    Get your API key from{' '}
                    <a 
                      href="https://platform.openai.com/api-keys" 
                      target="_blank" 
                      rel="noopener noreferrer"
                      className="text-indigo-600 hover:underline"
                    >
                      OpenAI Platform
                    </a>
                  </p>
                </div>
                <div className="flex items-center gap-2">
                  <button
                    onClick={testOpenAI}
                    disabled={isTestingOpenAI || !preferences.ocrSettings.openai_api_key}
                    className="bg-blue-600 text-white px-3 py-1 rounded text-sm disabled:bg-gray-400 hover:bg-blue-700"
                  >
                    {isTestingOpenAI ? 'Testing...' : 'Test API Key'}
                  </button>
                  {testResults.openai && (
                    <span className="text-sm">{testResults.openai}</span>
                  )}
                </div>
              </div>
            </div>

            {/* Ollama Settings */}
            <div className="border rounded-lg p-4 mb-6">
              <h4 className="font-medium text-gray-900 mb-3">Ollama Configuration</h4>
              <div className="space-y-3">
                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">
                    Ollama URL
                  </label>
                  <input
                    type="text"
                    value={preferences.ocrSettings.ollama_url}
                    onChange={(e) => updateOcrSetting('ollama_url', e.target.value)}
                    placeholder="http://localhost:11434"
                    className="w-full px-3 py-2 border border-gray-300 rounded-md focus:ring-indigo-500 focus:border-indigo-500"
                  />
                  <p className="text-xs text-gray-500 mt-1">
                    Requires LLaVA or similar vision model:{' '}
                    <code className="bg-gray-100 px-1 rounded">ollama pull llava</code>
                  </p>
                </div>
                <div className="flex items-center gap-2">
                  <button
                    onClick={testOllama}
                    disabled={isTestingOllama}
                    className="bg-green-600 text-white px-3 py-1 rounded text-sm disabled:bg-gray-400 hover:bg-green-700"
                  >
                    {isTestingOllama ? 'Testing...' : 'Test Ollama'}
                  </button>
                  {testResults.ollama && (
                    <span className="text-sm">{testResults.ollama}</span>
                  )}
                </div>
              </div>
            </div>

            {/* OCR Options */}
            <div className="space-y-4">
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Confidence Threshold ({preferences.ocrSettings.confidence_threshold}%)
                </label>
                <input
                  type="range"
                  min="0"
                  max="100"
                  value={preferences.ocrSettings.confidence_threshold}
                  onChange={(e) => updateOcrSetting('confidence_threshold', parseInt(e.target.value))}
                  className="w-full"
                />
                <p className="text-xs text-gray-500 mt-1">
                  Minimum confidence required to accept OCR results
                </p>
              </div>

              <label className="flex items-center">
                <input
                  type="checkbox"
                  checked={preferences.ocrSettings.auto_add_to_collection}
                  onChange={(e) => updateOcrSetting('auto_add_to_collection', e.target.checked)}
                  className="rounded border-gray-300 text-indigo-600 focus:ring-indigo-500"
                />
                <span className="ml-2 text-sm text-gray-700">
                  Automatically add scanned cards to selected collection
                </span>
              </label>
            </div>
          </div>
        )}

        {activeTab === 'privacy' && (
          <div className="bg-white rounded-lg border border-gray-200 p-6">
            <h3 className="text-lg font-medium mb-4">Privacy Settings</h3>
            
            <div className="space-y-4">
              <label className="flex items-center">
                <input
                  type="checkbox"
                  checked={preferences.privacySettings.collections_public}
                  onChange={(e) => updatePreference('privacySettings', {
                    ...preferences.privacySettings,
                    collections_public: e.target.checked
                  })}
                  className="rounded border-gray-300 text-indigo-600 focus:ring-indigo-500"
                />
                <span className="ml-2 text-sm text-gray-700">
                  Make collections public by default
                </span>
              </label>

              <label className="flex items-center">
                <input
                  type="checkbox"
                  checked={preferences.privacySettings.decks_public}
                  onChange={(e) => updatePreference('privacySettings', {
                    ...preferences.privacySettings,
                    decks_public: e.target.checked
                  })}
                  className="rounded border-gray-300 text-indigo-600 focus:ring-indigo-500"
                />
                <span className="ml-2 text-sm text-gray-700">
                  Make decks public by default
                </span>
              </label>
            </div>
          </div>
        )}
      </div>

      {/* Save Button */}
      <div className="mt-8 flex justify-end">
        <button
          onClick={savePreferences}
          disabled={isSaving}
          className="bg-indigo-600 text-white px-6 py-2 rounded-lg hover:bg-indigo-700 disabled:bg-gray-400 flex items-center gap-2"
        >
          {isSaving && <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-white"></div>}
          {isSaving ? 'Saving...' : 'Save Settings'}
        </button>
      </div>
    </div>
  );
};

export default Settings;