import { useState, useEffect } from 'react';
import { aiCardOCR, ollamaCardOCR, geminiCardOCR } from '../lib/ai-ocr';

export default function OCRSettings({ isOpen, onClose }) {
  const [settings, setSettings] = useState({
    service: 'gemini', // Default to free Gemini
    openaiApiKey: '',
    geminiApiKey: '',
    ollamaUrl: 'http://localhost:11434'
  });
  const [isTesting, setIsTesting] = useState(false);
  const [testResult, setTestResult] = useState(null);

  // Load settings from localStorage on mount
  useEffect(() => {
    const loadSettings = async () => {
      const savedSettings = localStorage.getItem('ocrSettings');
      let currentSettings = {
        service: 'gemini',
        openaiApiKey: '',
        geminiApiKey: '',
        ollamaUrl: 'http://localhost:11434'
      };
      
      if (savedSettings) {
        try {
          const parsed = JSON.parse(savedSettings);
          currentSettings = { ...currentSettings, ...parsed };
        } catch (error) {
          console.error('Error loading OCR settings:', error);
        }
      }

      // Try to auto-load Gemini API key from environment if not already set
      if (!currentSettings.geminiApiKey) {
        try {
          const response = await fetch('/api/config/gemini');
          if (response.ok) {
            const data = await response.json();
            if (data.hasKey && data.apiKey) {
              currentSettings.geminiApiKey = data.apiKey;
              currentSettings.service = 'gemini'; // Default to Gemini if key is available
            }
          }
        } catch (error) {
          console.log('Could not auto-load Gemini API key:', error);
        }
      }

      setSettings(currentSettings);
    };

    loadSettings();
  }, []);

  const saveSettings = () => {
    try {
      localStorage.setItem('ocrSettings', JSON.stringify(settings));
      
      // Configure AI services
      if (settings.openaiApiKey) {
        aiCardOCR.setApiKey(settings.openaiApiKey);
      }
      if (settings.geminiApiKey) {
        geminiCardOCR.setApiKey(settings.geminiApiKey);
      }
      if (settings.ollamaUrl) {
        ollamaCardOCR.setBaseUrl(settings.ollamaUrl);
      }
      
      setTestResult({ type: 'success', message: 'Settings saved successfully!' });
      setTimeout(() => setTestResult(null), 3000);
    } catch (error) {
      console.error('Error saving OCR settings:', error);
      setTestResult({ type: 'error', message: 'Failed to save settings' });
    }
  };

  const testConnection = async () => {
    setIsTesting(true);
    setTestResult(null);

    try {
      if (settings.service === 'puter') {
        // Test Puter.js connection
        try {
          // Try to load Puter.js if not already loaded
          if (typeof window !== 'undefined' && !window.puter) {
            const script = document.createElement('script');
            script.src = 'https://js.puter.com/v2/';
            await new Promise((resolve, reject) => {
              script.onload = resolve;
              script.onerror = reject;
              document.head.appendChild(script);
            });
          }

          if (window.puter && window.puter.ai) {
            setTestResult({ type: 'success', message: 'Puter.js loaded successfully! Ready for free AI vision.' });
          } else {
            setTestResult({ type: 'error', message: 'Failed to load Puter.js AI capabilities' });
          }
        } catch (error) {
          setTestResult({ type: 'error', message: 'Could not connect to Puter.js service' });
        }
      } else if (settings.service === 'openai') {
        if (!settings.openaiApiKey) {
          setTestResult({ type: 'error', message: 'Please enter your OpenAI API key' });
          return;
        }

        // Test with a simple request
        const response = await fetch('https://api.openai.com/v1/models', {
          headers: {
            'Authorization': `Bearer ${settings.openaiApiKey}`,
          }
        });

        if (response.ok) {
          setTestResult({ type: 'success', message: 'OpenAI API connection successful!' });
        } else {
          const error = await response.json().catch(() => ({}));
          setTestResult({ 
            type: 'error', 
            message: `OpenAI API error: ${error.error?.message || response.statusText}` 
          });
        }
      } else if (settings.service === 'gemini') {
        if (!settings.geminiApiKey) {
          setTestResult({ type: 'error', message: 'Please enter your Gemini API key' });
          return;
        }

        // Test with a simple request
        const response = await fetch('https://generativelanguage.googleapis.com/v1beta/models', {
          headers: {
            'x-goog-api-key': settings.geminiApiKey,
          }
        });

        if (response.ok) {
          const data = await response.json();
          const hasVisionModel = data.models?.some(model => 
            model.name.includes('gemini') && model.supportedGenerationMethods?.includes('generateContent')
          );
          
          if (hasVisionModel) {
            setTestResult({ type: 'success', message: 'Gemini API connection successful with vision support!' });
          } else {
            setTestResult({ 
              type: 'warning', 
              message: 'Gemini connected but vision capabilities unclear.' 
            });
          }
        } else {
          const error = await response.json().catch(() => ({}));
          setTestResult({ 
            type: 'error', 
            message: `Gemini API error: ${error.error?.message || response.statusText}` 
          });
        }
      } else if (settings.service === 'ollama') {
        // Test Ollama connection
        const response = await fetch(`${settings.ollamaUrl}/api/tags`);
        
        if (response.ok) {
          const data = await response.json();
          const hasVisionModel = data.models?.some(model => 
            model.name.includes('llava') || model.name.includes('vision')
          );
          
          if (hasVisionModel) {
            setTestResult({ type: 'success', message: 'Ollama connection successful with vision models!' });
          } else {
            setTestResult({ 
              type: 'warning', 
              message: 'Ollama connected but no vision models found. Install llava:latest for card scanning.' 
            });
          }
        } else {
          setTestResult({ type: 'error', message: 'Could not connect to Ollama server' });
        }
      }
    } catch (error) {
      console.error('Connection test error:', error);
      setTestResult({ 
        type: 'error', 
        message: `Connection failed: ${error.message}` 
      });
    } finally {
      setIsTesting(false);
    }
  };

  const handleInputChange = (field, value) => {
    setSettings(prev => ({
      ...prev,
      [field]: value
    }));
    setTestResult(null);
  };

  if (!isOpen) return null;

  return (
    <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 p-4">
      <div className="rounded-xl border max-w-md w-full max-h-[90vh] overflow-y-auto" style={{ backgroundColor: 'var(--bg-secondary)', borderColor: 'var(--border)' }}>
        {/* Header */}
        <div className="flex items-center justify-between p-6 border-b" style={{ borderColor: 'var(--border)' }}>
          <h2 className="text-xl font-semibold" style={{ color: 'var(--text-primary)' }}>
            🤖 OCR Settings
          </h2>
          <button
            onClick={onClose}
            className="p-2 rounded-lg hover:opacity-70 transition-opacity"
            style={{ color: 'var(--text-secondary)' }}
          >
            ✕
          </button>
        </div>

        {/* Content */}
        <div className="p-6 space-y-6">
          {/* Service Selection */}
          <div>
            <label className="block text-sm font-medium mb-3" style={{ color: 'var(--text-primary)' }}>
              OCR Service
            </label>
            <div className="space-y-2">
              <label className="flex items-center">
                <input
                  type="radio"
                  name="service"
                  value="puter"
                  checked={settings.service === 'puter'}
                  onChange={(e) => handleInputChange('service', e.target.value)}
                  className="mr-3"
                  style={{ accentColor: 'var(--accent-ember)' }}
                />
                <div>
                  <div className="font-medium" style={{ color: 'var(--text-primary)' }}>Puter.js</div>
                  <div className="text-sm" style={{ color: 'var(--text-secondary)' }}>
                    Free GPT-4o vision - requires signing in to puter.com first
                  </div>
                </div>
              </label>

              <label className="flex items-center">
                <input
                  type="radio"
                  name="service"
                  value="openai"
                  checked={settings.service === 'openai'}
                  onChange={(e) => handleInputChange('service', e.target.value)}
                  className="mr-3"
                  style={{ accentColor: 'var(--accent-ember)' }}
                />
                <div>
                  <div className="font-medium" style={{ color: 'var(--text-primary)' }}>OpenAI Vision API</div>
                  <div className="text-sm" style={{ color: 'var(--text-secondary)' }}>
                    High accuracy, requires API key (~$0.01 per scan)
                  </div>
                </div>
              </label>
              
              <label className="flex items-center">
                <input
                  type="radio"
                  name="service"
                  value="gemini"
                  checked={settings.service === 'gemini'}
                  onChange={(e) => handleInputChange('service', e.target.value)}
                  className="mr-3"
                  style={{ accentColor: 'var(--accent-ember)' }}
                />
                <div>
                  <div className="font-medium" style={{ color: 'var(--text-primary)' }}>Google Gemini (Recommended)</div>
                  <div className="text-sm" style={{ color: 'var(--text-secondary)' }}>
                    Free tier available, high accuracy, requires API key
                  </div>
                </div>
              </label>

              <label className="flex items-center">
                <input
                  type="radio"
                  name="service"
                  value="ollama"
                  checked={settings.service === 'ollama'}
                  onChange={(e) => handleInputChange('service', e.target.value)}
                  className="mr-3"
                  style={{ accentColor: 'var(--accent-ember)' }}
                />
                <div>
                  <div className="font-medium" style={{ color: 'var(--text-primary)' }}>Ollama Local</div>
                  <div className="text-sm" style={{ color: 'var(--text-secondary)' }}>
                    Private & free, requires local Ollama + LLaVA model
                  </div>
                </div>
              </label>
            </div>
          </div>

          {/* OpenAI Settings */}
          {settings.service === 'openai' && (
            <div>
              <label className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                OpenAI API Key
              </label>
              <input
                type="password"
                placeholder="sk-..."
                value={settings.openaiApiKey}
                onChange={(e) => handleInputChange('openaiApiKey', e.target.value)}
                className="w-full px-3 py-2 rounded-lg border"
                style={{
                  backgroundColor: 'var(--bg-primary)',
                  borderColor: 'var(--border)',
                  color: 'var(--text-primary)'
                }}
              />
              <div className="mt-2 text-sm" style={{ color: 'var(--text-secondary)' }}>
                Get your API key from{' '}
                <a 
                  href="https://platform.openai.com/api-keys" 
                  target="_blank" 
                  rel="noopener noreferrer"
                  className="underline hover:opacity-70"
                  style={{ color: 'var(--accent-ember)' }}
                >
                  OpenAI Platform
                </a>
              </div>
            </div>
          )}

          {/* Gemini Settings */}
          {settings.service === 'gemini' && (
            <div>
              <label className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                Gemini API Key
              </label>
              <input
                type="password"
                placeholder="AIza..."
                value={settings.geminiApiKey}
                onChange={(e) => handleInputChange('geminiApiKey', e.target.value)}
                className="w-full px-3 py-2 rounded-lg border"
                style={{
                  backgroundColor: 'var(--bg-primary)',
                  borderColor: 'var(--border)',
                  color: 'var(--text-primary)'
                }}
              />
              <div className="mt-2 text-sm" style={{ color: 'var(--text-secondary)' }}>
                Get your free API key from{' '}
                <a 
                  href="https://ai.google.dev/gemini-api/docs/api-key" 
                  target="_blank" 
                  rel="noopener noreferrer"
                  className="underline hover:opacity-70"
                  style={{ color: 'var(--accent-ember)' }}
                >
                  Google AI Studio
                </a>
              </div>
            </div>
          )}

          {/* Ollama Settings */}
          {settings.service === 'ollama' && (
            <div>
              <label className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                Ollama Server URL
              </label>
              <input
                type="url"
                placeholder="http://localhost:11434"
                value={settings.ollamaUrl}
                onChange={(e) => handleInputChange('ollamaUrl', e.target.value)}
                className="w-full px-3 py-2 rounded-lg border"
                style={{
                  backgroundColor: 'var(--bg-primary)',
                  borderColor: 'var(--border)',
                  color: 'var(--text-primary)'
                }}
              />
              <div className="mt-2 text-sm space-y-1" style={{ color: 'var(--text-secondary)' }}>
                <div>Install Ollama and run: <code className="px-1 py-0.5 rounded text-xs" style={{ backgroundColor: 'var(--bg-tertiary)' }}>ollama pull llava:latest</code></div>
                <div>
                  Setup guide:{' '}
                  <a 
                    href="https://ollama.ai" 
                    target="_blank" 
                    rel="noopener noreferrer"
                    className="underline hover:opacity-70"
                    style={{ color: 'var(--accent-ember)' }}
                  >
                    ollama.ai
                  </a>
                </div>
              </div>
            </div>
          )}

          {/* Test Result */}
          {testResult && (
            <div className={`p-3 rounded-lg border ${
              testResult.type === 'success' ? 'border-green-500 bg-green-50 dark:bg-green-900/20' :
              testResult.type === 'warning' ? 'border-yellow-500 bg-yellow-50 dark:bg-yellow-900/20' :
              'border-red-500 bg-red-50 dark:bg-red-900/20'
            }`}>
              <div className={`text-sm ${
                testResult.type === 'success' ? 'text-green-700 dark:text-green-300' :
                testResult.type === 'warning' ? 'text-yellow-700 dark:text-yellow-300' :
                'text-red-700 dark:text-red-300'
              }`}>
                {testResult.message}
              </div>
            </div>
          )}

          {/* Actions */}
          <div className="flex gap-3">
            <button
              onClick={testConnection}
              disabled={isTesting}
              className="flex-1 px-4 py-2 rounded-lg border font-medium transition-all duration-200 hover:opacity-80 disabled:opacity-50"
              style={{
                borderColor: 'var(--border)',
                color: 'var(--text-primary)'
              }}
            >
              {isTesting ? 'Testing...' : 'Test Connection'}
            </button>
            
            <button
              onClick={saveSettings}
              className="flex-1 px-4 py-2 rounded-lg font-medium transition-all duration-200 hover:opacity-90"
              style={{
                backgroundColor: 'var(--accent-ember)',
                color: 'white'
              }}
            >
              Save Settings
            </button>
          </div>

          {/* Usage Tips */}
          <div className="rounded-lg p-4" style={{ backgroundColor: 'var(--bg-tertiary)' }}>
            <div className="font-medium mb-2" style={{ color: 'var(--text-primary)' }}>💡 Tips</div>
            <ul className="text-sm space-y-1" style={{ color: 'var(--text-secondary)' }}>
              <li>• Puter.js offers free GPT-4o vision with no setup required</li>
              <li>• OpenAI Vision API offers highest accuracy for card recognition</li>
              <li>• Ollama is free and private but requires local setup</li>
              <li>• Test your connection before scanning cards</li>
              <li>• Settings are saved locally in your browser</li>
            </ul>
          </div>
        </div>
      </div>
    </div>
  );
}