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<!DOCTYPE html>
<html>
<head>
    <title>Spiral Visualization with Flask</title>
    <script src="https://cdn.jsdelivr.net/npm/vega@5"></script>
    <script src="https://cdn.jsdelivr.net/npm/vega-lite@5"></script>
    <script src="https://cdn.jsdelivr.net/npm/vega-embed@6"></script>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 20px;
            background-color: #f5f5f5;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        h1 {
            color: #333;
            text-align: center;
        }
        .controls {
            margin: 20px 0;
            padding: 20px;
            background-color: #f8f9fa;
            border-radius: 5px;
        }
        .slider-container {
            margin: 15px 0;
        }
        label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
        }
        input[type="range"] {
            width: 100%;
        }
        .value-display {
            display: inline-block;
            width: 50px;
            text-align: right;
        }
        #vis {
            width: 700px;
            height: 700px;
            margin: 20px auto;
        }
        button {
            background-color: #007bff;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
        }
        button:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Welcome to Flask Spiral Visualization!</h1>
        
        <div class="controls">
            <div class="slider-container">
                <label for="points">Number of points in spiral: <span id="points-value" class="value-display">1100</span></label>
                <input type="range" id="points" name="points" min="1" max="10000" value="1100">
            </div>
            
            <div class="slider-container">
                <label for="turns">Number of turns in spiral: <span id="turns-value" class="value-display">31</span></label>
                <input type="range" id="turns" name="turns" min="1" max="300" value="31">
            </div>
            
            <button onclick="updateChart()">Update Chart</button>
        </div>
        
        <div id="vis"></div>
    </div>

    <script>
        // Initialize slider value displays
        document.getElementById('points').addEventListener('input', function() {
            document.getElementById('points-value').textContent = this.value;
        });
        
        document.getElementById('turns').addEventListener('input', function() {
            document.getElementById('turns-value').textContent = this.value;
        });
        
        // Function to update the chart
        function updateChart() {
            const numPoints = document.getElementById('points').value;
            const numTurns = document.getElementById('turns').value;
            
            fetch('/generate_chart', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    num_points: parseInt(numPoints),
                    num_turns: parseInt(numTurns)
                })
            })
            .then(response => response.json())
            .then(data => {
                vegaEmbed('#vis', JSON.parse(data.chart));
            })
            .catch(error => {
                console.error('Error:', error);
            });
        }
        
        // Load initial chart
        document.addEventListener('DOMContentLoaded', function() {
            updateChart();
        });
    </script>
</body>
</html>