{% extends "base.html" %}

{% block title %}Graph & Plot Generator | TexLab{% endblock %}

{% block extra_css %}
<style>
    .feature-card {
  display: inline-block;
  width: 100%;
  height: auto !important;
  padding: 20px 25px;
  margin-bottom: 20px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}
  .command-input {
    border: 2px solid #ddd;
    border-radius: 10px;
    padding: 15px;
    background: white;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
  }

  .command-input input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1.1rem;
    font-family: 'Consolas', 'Courier New', monospace;
  }

  .command-input input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
  }

  .examples {
    background: #e3f2fd;
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
  }

  .example-list {
    text-align: left;
    padding-left: 20px;
  }

  .example-list li {
    margin-bottom: 10px;
    font-family: 'Consolas', 'Courier New', monospace;
    background: white;
    padding: 8px 12px;
    border-radius: 5px;
    display: inline-block;
    margin: 5px;
  }

  .graph-container {
    text-align: center;
    margin: 30px 0;
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .graph-placeholder {
    color: #888;
  }

  .graph-image {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }

  .loading {
    display: none;
    text-align: center;
    padding: 20px;
  }

  .spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top: 4px solid #667eea;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
  }

  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  .function-info {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 15px;
    margin: 20px 0;
    text-align: center;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 1.1rem;
  }

  @media (max-width: 768px) {
    .command-input input {
      font-size: 1rem;
    }
    
    .example-list li {
      display: block;
      margin: 5px 0;
    }
  }
</style>
{% endblock %}

{% block content %}
<div class="page-header">
  <h1 class="page-title"><i class="fas fa-chart-line me-2"></i>Graph & Plot Generator</h1>
  <p class="page-subtitle">
    Generate beautiful mathematical graphs and plots from simple text commands.
  </p>
</div>

<div class="row">
  <div class="col-lg-10 mx-auto">
    <div class="feature-card">
      <h3 class="section-title">Create Your Graph</h3>
      
      <div class="command-input">
        <input type="text" id="commandInput" placeholder="Enter a command like: plot x^2 from -5 to 5" autocomplete="off">
      </div>
      
      <div class="text-center">
        <button id="generateBtn" class="btn btn-primary-gradient">
          <i class="fas fa-chart-line me-2"></i>Generate Graph
        </button>
        <button id="clearBtn" class="btn btn-neutral ms-2">
          <i class="fas fa-eraser me-2"></i>Clear
        </button>
      </div>
    </div>

    <div class="examples">
      <h5><i class="fas fa-lightbulb me-2"></i>Example Commands:</h5>
      <ul class="example-list">
        <li>plot x^2 from -5 to 5</li>
        <li>plot sin(x) from 0 to 2*pi</li>
        <li>plot x^3 - 2*x + 1 from -3 to 3</li>
        <li>plot cos(x) from -pi to pi</li>
        <li>plot sqrt(x) from 0 to 10</li>
        <li>plot exp(-x^2) from -3 to 3</li>
      </ul>
    </div>

    <div class="loading" id="loading">
      <div class="spinner"></div>
      <p>Generating your graph... This may take a few seconds.</p>
    </div>

    <div class="function-info" id="functionInfo" style="display: none;">
      Function: <span id="functionText"></span> | Range: <span id="rangeText"></span>
    </div>

    <div class="graph-container">
      <div id="graphPlaceholder" class="graph-placeholder">
        <i class="fas fa-chart-line fa-3x mb-3"></i>
        <h4>Your Graph Will Appear Here</h4>
        <p class="text-muted">Enter a plot command above and click "Generate Graph"</p>
      </div>
      <img id="graphImage" class="graph-image" style="display: none;">
    </div>

    <div class="feature-card" id="latexCard" style="display: none;">
      <h3 class="section-title">✅ LaTeX Code</h3>
      
      <div style="margin-bottom: 15px; padding: 15px; background: #e8f5e9; border-radius: 8px; text-align: left;">
        <strong>Latex code will appear here</strong>
        <ul style="margin: 10px 0; padding-left: 20px;">
          
        </ul>
      </div>
      
      <!-- <div class="latex-output" id="latexOutput" style="background: #f8f9fa; border-radius: 10px; padding: 20px; border: 1px solid #eee; font-family: 'Consolas', 'Courier New', monospace; font-size: 1rem; white-space: pre-wrap; word-break: break-all; min-height: 100px; margin: 20px 0; max-height: 400px; overflow-y: auto;"></div> -->
            <div class="latex-output" id="latexOutput" style="display: none;"></div>


      <div class="actions" style="margin-top: 20px; text-align: center;">
        <button id="copyLatexBtn" class="btn btn-secondary-gradient">
          <i class="fas fa-copy me-2"></i>Copy LaTeX
        </button>
        <button id="downloadLatexBtn" class="btn btn-success-gradient" style="background: linear-gradient(135deg, #28a745 0%, #20c997 100%); color: white; border: none; padding: 12px 25px; border-radius: 50px; font-weight: 600; transition: all 0.3s ease;">
          <i class="fas fa-download me-2"></i>Download .tex File
        </button>
        <a href="/graph" class="btn btn-neutral">
          <i class="fas fa-redo me-2"></i>New Graph
        </a>
        <a href="/" class="btn btn-neutral">
          <i class="fas fa-home me-2"></i>Back to Home
        </a>
      </div>
    </div>
  </div>
</div>
{% endblock %}

{% block extra_js %}
<script>
  // DOM elements
  const commandInput = document.getElementById('commandInput');
  const generateBtn = document.getElementById('generateBtn');
  const clearBtn = document.getElementById('clearBtn');
  const graphPlaceholder = document.getElementById('graphPlaceholder');
  const graphImage = document.getElementById('graphImage');
  const loading = document.getElementById('loading');
  const functionInfo = document.getElementById('functionInfo');
  const functionText = document.getElementById('functionText');
  const rangeText = document.getElementById('rangeText');
  const latexCard = document.getElementById('latexCard');
  const latexOutput = document.getElementById('latexOutput');
  
  // Focus on input when page loads
  window.addEventListener('load', () => {
    commandInput.focus();
  });
  
  // Generate graph on button click
  generateBtn.addEventListener('click', generateGraph);
  
  // Generate graph on Enter key
  commandInput.addEventListener('keypress', (e) => {
    if (e.key === 'Enter') {
      generateGraph();
    }
  });
  
  // Clear button
  clearBtn.addEventListener('click', () => {
    commandInput.value = '';
    graphPlaceholder.style.display = 'block';
    graphImage.style.display = 'none';
    functionInfo.style.display = 'none';
    latexCard.style.display = 'none';
    commandInput.focus();
  });
  
  // Generate graph function
  async function generateGraph() {
    const command = commandInput.value.trim();
    
    if (!command) {
      alert('Please enter a command');
      return;
    }
    
    try {
      // Show loading indicator
      loading.style.display = 'block';
      graphPlaceholder.style.display = 'none';
      graphImage.style.display = 'none';
      functionInfo.style.display = 'none';
      latexCard.style.display = 'none';
      
      // Send request to backend
      const response = await fetch('/graph/generate', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json'
        },
        body: JSON.stringify({ command: command })
      });
      
      const data = await response.json();
      
      if (data.success) {
        // Display graph
        graphImage.src = 'data:image/png;base64,' + data.image;
        graphImage.style.display = 'block';
        
        // Display function info
        functionText.textContent = data.function;
        rangeText.textContent = data.range;
        functionInfo.style.display = 'block';
        
        // Use real TikZ/pgfplots LaTeX code from backend
        latexOutput.textContent = data.latex;
        latexCard.style.display = 'block';
      } else {
        alert('Error: ' + data.error);
        graphPlaceholder.style.display = 'block';
      }
    } catch (error) {
      console.error('Error:', error);
      alert('An error occurred. Please try again.');
      graphPlaceholder.style.display = 'block';
    } finally {
      // Hide loading indicator
      loading.style.display = 'none';
    }
  }
  
  // Copy LaTeX to clipboard
  document.getElementById('copyLatexBtn').addEventListener('click', () => {
    const latexText = latexOutput.textContent;
    navigator.clipboard.writeText(latexText).then(() => {
      alert('✅ TikZ/pgfplots LaTeX code copied to clipboard!\nReady to paste into Overleaf.');
    }).catch(err => {
      console.error('Failed to copy: ', err);
      alert('Failed to copy LaTeX code. Please try again.');
    });
  });
  
  // Download LaTeX file
  document.getElementById('downloadLatexBtn').addEventListener('click', () => {
    const latexText = latexOutput.textContent;
    const blob = new Blob([latexText], { type: 'text/plain' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = 'graph.tex';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);
    alert('✅ LaTeX file downloaded!\nYou can now upload it to Overleaf.');
  });
</script>
{% endblock %}