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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>LC 412: Fizz Buzz - Algorithm Visualization</title>
    <link rel="stylesheet" href="styles.css">
    <script src="https://d3js.org/d3.v7.min.js"></script>
</head>
<body>
    <div class="container">
        <div class="problem-info">
            <h1><span class="problem-number">#412</span> Fizz Buzz</h1>
            <p>Given an integer n, return a string array where: "FizzBuzz" if i divisible by 3 and 5, "Fizz" if divisible by 3, "Buzz" if divisible by 5, else the number.</p>
            <div class="problem-meta">
                <span class="meta-tag">🔢 Math</span>
                <span class="meta-tag">📝 String</span>
                <span class="meta-tag">⏱️ O(n)</span>
                <span class="meta-tag">💾 O(n)</span>
            </div>
            <div class="file-ref">
                📄 Python: <code>python/0412_fizz_buzz/0412_fizz_buzz.py</code>
            </div>
            </div>

        <div class="explanation-panel">
            <h4>🧠 How It Works (Layman's Terms)</h4>
            <ul>
                <li><strong>Divisibility:</strong> Check if number is divisible by 3, 5, or both</li>
                <li><strong>Priority:</strong> Check 15 (FizzBuzz) first, then 3 (Fizz), then 5 (Buzz)</li>
                <li><strong>Default:</strong> If not divisible by 3 or 5, use the number itself</li>
            </ul>
        </div>


        <div class="visualization-section">
            <h3>🎬 Step-by-Step Visualization</h3>

            <div class="controls">
                <label>n = </label>
                <input type="range" id="nSlider" min="1" max="100" value="30" oninput="updateN()">
                <span id="nValue">30</span>
                <button class="btn btn-primary" id="startBtn" onclick="start()">▶ Start</button>
                <button class="btn btn-warning" onclick="reset()">Reset</button>
            </div>

            <div class="status-message" id="statusMessage">
                Click Start to generate FizzBuzz sequence
            </div>

            <div style="margin-top: 20px;">
                <div id="gridDisplay" style="display: grid; grid-template-columns: repeat(10, 1fr); gap: 5px; padding: 15px; background: #f5f5f5; border-radius: 12px;"></div>
            </div>

            <div style="display: flex; gap: 20px; margin-top: 20px; flex-wrap: wrap;">
                <div style="flex: 1; padding: 15px; background: #e8f5e9; border-radius: 12px; text-align: center;">
                    <div style="font-size: 2em; font-weight: bold; color: #4caf50;" id="fizzCount">0</div>
                    <div>Fizz (÷3)</div>
                </div>
                <div style="flex: 1; padding: 15px; background: #e3f2fd; border-radius: 12px; text-align: center;">
                    <div style="font-size: 2em; font-weight: bold; color: #2196f3;" id="buzzCount">0</div>
                    <div>Buzz (÷5)</div>
                </div>
                <div style="flex: 1; padding: 15px; background: #fce4ec; border-radius: 12px; text-align: center;">
                    <div style="font-size: 2em; font-weight: bold; color: #e91e63;" id="fizzBuzzCount">0</div>
                    <div>FizzBuzz (÷15)</div>
                </div>
                <div style="flex: 1; padding: 15px; background: #fff3e0; border-radius: 12px; text-align: center;">
                    <div style="font-size: 2em; font-weight: bold; color: #ff9800;" id="numberCount">0</div>
                    <div>Numbers</div>
                </div>
            </div>
        </div>

        <div class="code-section">
            <h3>💻 Python Solution</h3>
            <div class="code-block">
                <pre><span class="keyword">def</span> <span class="function">fizzBuzz</span>(n):
    result = []
    <span class="keyword">for</span> i <span class="keyword">in</span> <span class="function">range</span>(<span class="number">1</span>, n + <span class="number">1</span>):
        <span class="keyword">if</span> i % <span class="number">15</span> == <span class="number">0</span>:
            result.<span class="function">append</span>(<span class="string">"FizzBuzz"</span>)
        <span class="keyword">elif</span> i % <span class="number">3</span> == <span class="number">0</span>:
            result.<span class="function">append</span>(<span class="string">"Fizz"</span>)
        <span class="keyword">elif</span> i % <span class="number">5</span> == <span class="number">0</span>:
            result.<span class="function">append</span>(<span class="string">"Buzz"</span>)
        <span class="keyword">else</span>:
            result.<span class="function">append</span>(<span class="function">str</span>(i))
    <span class="keyword">return</span> result</pre>
            </div>
        </div>
    </div>

    <script>
        let n = 30;
        let result = [];
        let currentIndex = 0;
        let isRunning = false;

        function getFizzBuzz(num) {
            if (num % 15 === 0) return { text: 'FizzBuzz', type: 'fizzbuzz' };
            if (num % 3 === 0) return { text: 'Fizz', type: 'fizz' };
            if (num % 5 === 0) return { text: 'Buzz', type: 'buzz' };
            return { text: String(num), type: 'number' };
        }

        function updateN() {
            n = parseInt(document.getElementById('nSlider').value);
            document.getElementById('nValue').textContent = n;
            reset();
        }

        function render() {
            const container = document.getElementById('gridDisplay');
            container.innerHTML = result.map((item, i) => {
                const colors = {
                    fizz: '#4caf50',
                    buzz: '#2196f3',
                    fizzbuzz: '#e91e63',
                    number: '#ff9800'
                };
                const bg = colors[item.type] || '#999';
                const isNew = i === currentIndex - 1;

                return `<div style="
                    padding: 8px 4px;
                    background: ${bg};
                    color: white;
                    border-radius: 6px;
                    font-size: ${item.type === 'fizzbuzz' ? '0.6em' : '0.75em'};
                    font-weight: bold;
                    text-align: center;
                    ${isNew ? 'transform: scale(1.1); box-shadow: 0 0 10px rgba(0,0,0,0.3);' : ''}
                    transition: all 0.2s;
                ">${item.text}</div>`;
            }).join('');

            // Update counts
            const counts = { fizz: 0, buzz: 0, fizzbuzz: 0, number: 0 };
            result.forEach(item => counts[item.type]++);
            document.getElementById('fizzCount').textContent = counts.fizz;
            document.getElementById('buzzCount').textContent = counts.buzz;
            document.getElementById('fizzBuzzCount').textContent = counts.fizzbuzz;
            document.getElementById('numberCount').textContent = counts.number;
        }

        async function start() {
            if (isRunning) {
                isRunning = false;
                document.getElementById('startBtn').textContent = '▶ Start';
                return;
            }

            isRunning = true;
            document.getElementById('startBtn').textContent = '⏸ Pause';

            while (currentIndex < n && isRunning) {
                currentIndex++;
                const fb = getFizzBuzz(currentIndex);
                result.push(fb);
                document.getElementById('statusMessage').textContent =
                    `i = ${currentIndex}: ${currentIndex} % 15 = ${currentIndex % 15}, % 3 = ${currentIndex % 3}, % 5 = ${currentIndex % 5} → "${fb.text}"`;
                render();
                await new Promise(r => setTimeout(r, 100));
            }

            if (currentIndex >= n) {
                document.getElementById('statusMessage').textContent = `Done! Generated FizzBuzz from 1 to ${n}`;
            }
            isRunning = false;
            document.getElementById('startBtn').textContent = '▶ Start';
        }

        function reset() {
            isRunning = false;
            result = [];
            currentIndex = 0;
            document.getElementById('statusMessage').textContent = 'Click Start to generate FizzBuzz sequence';
            document.getElementById('startBtn').textContent = '▶ Start';
            document.getElementById('gridDisplay').innerHTML = '<span style="color: #999; grid-column: span 10; text-align: center;">Sequence will appear here...</span>';
            document.getElementById('fizzCount').textContent = '0';
            document.getElementById('buzzCount').textContent = '0';
            document.getElementById('fizzBuzzCount').textContent = '0';
            document.getElementById('numberCount').textContent = '0';
        }

        reset();
    </script>
</body>
</html>