import { useState } from 'react';
import Script from 'next/script';
import { Inter } from 'next/font/google';
import SketchRenderer from '../components/SketchRenderer';
import GenerationForm from '../components/GenerationForm';
import CodePanel from '../components/CodePanel';
import { initialSketch, examples, exampleReasonings } from '../sketches';

const inter = Inter({
  subsets: ['latin'],
  variable: '--font-inter',
});

export default function Home() {
  const [word, setWord] = useState('');
  const [instructions, setInstructions] = useState('');
  const [isGenerating, setIsGenerating] = useState(false);
  const [generatedCode, setGeneratedCode] = useState(initialSketch);
  const [showCodePanel, setShowCodePanel] = useState(false);
  const [error, setError] = useState(null);
  const [activeExample, setActiveExample] = useState(null);
  const [showExamples, setShowExamples] = useState(false);
  const [modelResponse, setModelResponse] = useState('');
  const [showSystemPrompt, setShowSystemPrompt] = useState(false);
  const [isCapturingGif, setIsCapturingGif] = useState(false);

  const handleExampleClick = (example) => {
    setActiveExample(example);
    setGeneratedCode(examples[example]);
    setShowCodePanel(true);
    setModelResponse(exampleReasonings[example]);
  };

  const handleSubmit = async (e) => {
    e.preventDefault();
    setIsGenerating(true);
    setError(null);
    setActiveExample(null);

    try {
      const response = await fetch('/api/generate', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ word, instructions }),
      });

      const data = await response.json();
      
      if (!response.ok) {
        throw new Error(data.message || `API error: ${response.status}`);
      }

      if (!data || data.error) {
        throw new Error(data.error || 'No data received from API');
      }

      if (!data.code || !data.code.includes('function setup()')) {
        throw new Error('Generated code is not in the correct format');
      }

      setGeneratedCode(data.code);
      setModelResponse(data.fullResponse || '');
      setShowCodePanel(true);
    } catch (error) {
      console.error('Generation error:', error);
      setError(error.message);
    } finally {
      setIsGenerating(false);
    }
  };

  const handleReplay = () => {
    setGeneratedCode(prevCode => prevCode + ' ');
    requestAnimationFrame(() => {
      setGeneratedCode(prevCode => prevCode.slice(0, -1));
    });
  };

  const handleGifCapture = async (startCapture) => {
    if (startCapture) {
      setIsCapturingGif(true);
      try {
        const iframe = document.getElementById('sketch-iframe');
        if (iframe) {
          iframe.contentWindow.postMessage({ type: 'startGifCapture' }, '*');
        }
      } catch (error) {
        console.error('GIF capture error:', error);
        setIsCapturingGif(false);
      }
    } else {
      setIsCapturingGif(false);
    }
  };

  return (
    <div className={`min-h-screen bg-white text-black flex flex-col items-center p-4 sm:p-8 ${inter.variable}`}>
      <Script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.9.0/p5.js" strategy="beforeInteractive" />
      
      <header className="w-full flex items-center mb-8 pl-4 sm:pl-8">
        <div className="flex items-center gap-2">
          <h1 
            className="text-xl font-medium cursor-pointer hover:opacity-80 transition-opacity"
            onClick={() => window.location.reload()}
          >
            Word to Code
          </h1>
          <div className="text-sm text-gray-500">
            Built with <a href="https://ai.google.dev/docs" target="_blank" rel="noopener noreferrer" className="underline hover:text-black">Gemini 2.0</a>
          </div>
        </div>
      </header>

      <main className={`w-full max-w-[1200px] flex flex-col gap-6 mx-auto transition-all duration-500 ease-in-out ${showCodePanel ? '' : 'items-center'}`}>
        <div className={`flex flex-col lg:flex-row gap-8 items-start w-full transition-all duration-500 ease-in-out ${
          showCodePanel ? 'justify-center translate-x-0' : 'justify-center'
        }`}>
          <div className={`flex flex-col gap-6 w-full max-w-[500px] transition-all duration-500 ease-in-out ${showCodePanel ? '' : 'items-center'}`}>
            <SketchRenderer
              generatedCode={generatedCode}
              isGenerating={isGenerating}
              error={error}
              showCodePanel={showCodePanel}
              onReplay={handleReplay}
              onGifCapture={handleGifCapture}
              isCapturingGif={isCapturingGif}
              isInitialSketch={generatedCode === initialSketch}
            />

            <GenerationForm
              word={word}
              setWord={setWord}
              instructions={instructions}
              setInstructions={setInstructions}
              isGenerating={isGenerating}
              showSystemPrompt={showSystemPrompt}
              setShowSystemPrompt={setShowSystemPrompt}
              showExamples={showExamples}
              setShowExamples={setShowExamples}
              activeExample={activeExample}
              handleExampleClick={handleExampleClick}
              onSubmit={handleSubmit}
            />
          </div>

          {showCodePanel && (
            <CodePanel
              modelResponse={modelResponse}
              generatedCode={generatedCode}
            />
          )}
        </div>
      </main>

      <style jsx global>{`
        ::-webkit-scrollbar {
          display: none;
        }

        @keyframes fadeIn {
          from {
            opacity: 0;
            transform: translateY(10px);
          }
          to {
            opacity: 1;
            transform: translateY(0);
          }
        }

        @media (min-width: 1024px) {
          @keyframes fadeIn {
            from {
              opacity: 0;
              transform: translateX(10px);
            }
            to {
              opacity: 1;
              transform: translateX(0);
            }
          }
        }
      `}</style>
    </div>
  );
}