{{define "learn_number"}}
<div id="panel-learn-number" class="tool-panel">
    <header class="page-header">
        <h1>幼儿数学助手</h1>
        <p>通过高品质卡通图形，培养孩子的数感与逻辑思维。</p>
    </header>
    <div class="tabs-container">
        <div id="tab-counting" class="tab-btn active">数图形练习</div>
    </div>
    <div class="card">
        <div style="display: flex; flex-direction: column; gap: 32px;">
            <!-- 设置区 -->
            <div style="display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 20px; align-items: flex-end;">
                <div class="input-group">
                    <label style="font-size: 13px; font-weight: 600; color: #86868b; margin-bottom: 8px; display: block;">练习主题</label>
                    <select id="math_category" onchange="updateIconPreview()" class="apple-select">
                        <option value="fruits">素材库 (SVG)</option>
                        <option value="shapes">基础几何图形</option>
                    </select>
                </div>
                <div class="input-group">
                    <label style="font-size: 13px; font-weight: 600; color: #86868b; margin-bottom: 8px; display: block;">种类 (Max 6)</label>
                    <input type="number" id="icon_types" min="1" max="6" value="3" class="apple-input">
                </div>
                <div class="input-group">
                    <label style="font-size: 13px; font-weight: 600; color: #86868b; margin-bottom: 8px; display: block;">总量 (Max 30)</label>
                    <input type="number" id="total_count" min="1" max="30" value="15" class="apple-input">
                </div>
                <div class="input-group">
                    <label style="font-size: 13px; font-weight: 600; color: #86868b; margin-bottom: 8px; display: block;">页数 (1-10)</label>
                    <input type="number" id="page_count" min="1" max="10" value="1" class="apple-input">
                </div>
                <div class="input-group">
                    <label style="font-size: 13px; font-weight: 600; color: #86868b; margin-bottom: 8px; display: block;">纸张大小</label>
                    <select id="math_paper_size" class="apple-select">
                        <option value="Letter" selected>Letter (8.5x11in)</option>
                        <option value="A4">A4 (210x297mm)</option>
                    </select>
                </div>
                <button id="btn-generate-math" onclick="generateMathPDF()" style="height: 46px; padding: 0 20px;">生成练习帖</button>
            </div>

            <!-- 图标预览 -->
            <div id="icon-preview-container" style="padding: 24px; background: #fbfbfd; border-radius: 16px; border: 1px solid #e5e5e7;">
                <label style="font-size: 11px; font-weight: 700; color: #86868b; display: block; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px;">当前主题包含的图案：</label>
                <div id="icon-list" style="display: flex; gap: 16px; flex-wrap: wrap;">
                    <!-- JS 动态注入 -->
                </div>
            </div>

            <div id="math-error-msg" style="color: #ff3b30; font-size: 14px; display: none; font-weight: 500; text-align: center; padding: 10px; background: #fff2f2; border-radius: 8px;">
                ⚠️ 请确保：总数 >= 种类数，页数 1-10。
            </div>
        </div>
    </div>
    
    <div id="math-preview" style="display:none; width: 100%; height: 850px; border-radius: 24px; overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,0.12); background: #fff; border: 1px solid #d2d2d7; margin-top: 40px;">
        <iframe id="math-frame" style="width:100%; height:100%; border:none;"></iframe>
    </div>
</div>

<style>
    .apple-input, .apple-select {
        width: 100%; height: 46px; padding: 0 12px; border: 1px solid #d2d2d7; border-radius: 10px;
        font-size: 15px; font-weight: 500; background-color: #ffffff; transition: all 0.2s ease;
        outline: none; box-shadow: inset 0 1px 2px rgba(0,0,0,0.05); line-height: 46px;
    }
    .apple-input:focus, .apple-select:focus { border-color: #0071e3; box-shadow: 0 0 0 4px rgba(0,113,227,0.15); }
    .icon-thumbnail {
        width: 64px; height: 64px; background: white; border-radius: 12px; border: 1px solid #e5e5e7;
        display: flex; align-items: center; justify-content: center; padding: 8px;
        box-shadow: 0 2px 6px rgba(0,0,0,0.04); transition: all 0.2s ease;
    }
    .icon-thumbnail:hover { transform: translateY(-3px); border-color: #0071e3; box-shadow: 0 8px 20px rgba(0,0,0,0.08); }
</style>

<script>
    let allCategories = {};
    async function initMathTool() {
        try {
            const res = await fetch('/api/learn-number/categories');
            allCategories = await res.json();
            updateIconPreview();
        } catch (e) { console.error(e); }
    }

    function calculateBBox(paths) {
        let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
        // 增强正则：匹配所有数字，包括带逗号的
        const numRegex = /-?\d+\.?\d*/g;
        paths.forEach(path => {
            const matches = path.match(numRegex);
            if (matches) {
                for (let i=0; i<matches.length; i+=2) {
                    const x = parseFloat(matches[i]);
                    const y = parseFloat(matches[i+1]);
                    if (!isNaN(x) && !isNaN(y)) {
                        if (x < minX) minX = x; if (x > maxX) maxX = x;
                        if (y < minY) minY = y; if (y > maxY) maxY = y;
                    }
                }
            }
        });
        if (minX === Infinity) return "0 0 1024 1024";
        const w = maxX - minX, h = maxY - minY;
        const padding = Math.max(w, h) * 0.15;
        return `${minX - padding} ${minY - padding} ${w + padding*2} ${h + padding*2}`;
    }

    function updateIconPreview() {
        const cat = document.getElementById('math_category').value;
        const icons = allCategories[cat] || [];
        const container = document.getElementById('icon-list');
        container.innerHTML = '';
        icons.forEach(icon => {
            const div = document.createElement('div');
            div.className = 'icon-thumbnail';
            const viewBox = calculateBBox(icon.Paths);
            const pathsHtml = icon.Paths.map(p => `<path d="${p}" fill="none" stroke="black" stroke-width="2%" stroke-linecap="round" stroke-linejoin="round" />`).join('');
            div.innerHTML = `<svg viewBox="${viewBox}" style="width: 100%; height: 100%; overflow: visible;">${pathsHtml}</svg>`;
            div.title = icon.Name;
            container.appendChild(div);
        });
    }

    async function generateMathPDF() {
        const total_count = parseInt(document.getElementById('total_count').value);
        const icon_types = parseInt(document.getElementById('icon_types').value);
        const page_count = parseInt(document.getElementById('page_count').value || 1);
        const category = document.getElementById('math_category').value;
        const paper_size = document.getElementById('math_paper_size').value;
        const errorMsg = document.getElementById('math-error-msg');
        
        if (total_count < icon_types || icon_types > 6 || total_count > 30) {
            errorMsg.style.display = 'block';
            return;
        }
        errorMsg.style.display = 'none';

        const btn = document.getElementById('btn-generate-math');
        const originalText = btn.innerText;
        btn.innerText = '生成中...'; btn.disabled = true;
        try {
            const response = await fetch('/api/learn-number/counting', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ total_count, icon_types, page_count, category, paper_size })
            });
            const blob = await response.blob();
            const url = URL.createObjectURL(blob);
            document.getElementById('math-preview').style.display = 'block';
            document.getElementById('math-frame').src = url;
        } catch (e) {
            alert('生成失败: ' + e);
        } finally {
            btn.innerText = originalText; btn.disabled = false;
        }
    }

    setTimeout(initMathTool, 200);
</script>
{{end}}