<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="csrf-token" content="{{ csrf_token() }}">
    <title>题目预览验证工具 - Math CMS</title>

    <!-- KaTeX CSS (本地) -->
    <link rel="stylesheet" href="/vendor/katex/katex.min.css">

    <!-- Tailwind CSS (本地) -->
    <script src="/vendor/tailwind.min.js"></script>

    <!-- Alpine.js (本地) -->
    <script defer src="/vendor/alpine.min.js"></script>

    <!-- KaTeX JS (本地) -->
    <script src="/vendor/katex/katex.min.js"></script>

    <style>
        [x-cloak] { display: none !important; }

        .math-preview {
            font-family: "SimSun", "Songti SC", serif;
            line-height: 1.8;
        }

        .math-preview .katex {
            font-size: 1.1em;
        }

        .math-preview .katex-display {
            margin: 0.5em 0;
        }

        .question-stem {
            margin-bottom: 1rem;
        }

        .question-options {
            margin-left: 1rem;
        }

        .question-option {
            margin: 0.5rem 0;
        }

        .question-answer {
            margin-top: 1rem;
            padding-top: 0.5rem;
            border-top: 1px dashed #ccc;
        }

        .question-solution {
            margin-top: 1rem;
            padding: 0.75rem;
            background: #f9f9f9;
            border-radius: 4px;
        }
    </style>
</head>
<body class="bg-gray-100 min-h-screen">
    <div class="max-w-7xl mx-auto py-8 px-4" x-data="questionPreview()" x-cloak>
        <!-- 标题 -->
        <div class="text-center mb-8">
            <h1 class="text-2xl font-bold text-gray-800">题目预览验证工具</h1>
            <p class="text-gray-500 mt-2">验证题目在网页和PDF中的显示效果</p>
        </div>

        <div class="grid grid-cols-1 lg:grid-cols-2 gap-8">
            <!-- 左侧：输入表单 -->
            <div class="bg-white rounded-lg shadow p-6">
                <h2 class="text-lg font-semibold text-gray-700 mb-4">输入题目内容</h2>

                <!-- 题干 -->
                <div class="mb-4">
                    <label class="block text-sm font-medium text-gray-700 mb-1">
                        题干 <span class="text-red-500">*</span>
                    </label>
                    <textarea
                        x-model="form.stem"
                        rows="5"
                        class="w-full border border-gray-300 rounded-md px-3 py-2 focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                        placeholder="粘贴题干内容，支持 LaTeX 公式（如 $$\sqrt{2}$$ 或 $x^2$）"
                    ></textarea>
                </div>

                <!-- 选项 -->
                <div class="mb-4">
                    <label class="block text-sm font-medium text-gray-700 mb-2">
                        选项（选填，不填则为填空/解答题）
                    </label>
                    <div class="grid grid-cols-2 gap-3">
                        <div>
                            <label class="text-xs text-gray-500">A</label>
                            <input
                                type="text"
                                x-model="form.options.A"
                                class="w-full border border-gray-300 rounded-md px-3 py-2 text-sm focus:ring-2 focus:ring-blue-500"
                                placeholder="选项 A"
                            >
                        </div>
                        <div>
                            <label class="text-xs text-gray-500">B</label>
                            <input
                                type="text"
                                x-model="form.options.B"
                                class="w-full border border-gray-300 rounded-md px-3 py-2 text-sm focus:ring-2 focus:ring-blue-500"
                                placeholder="选项 B"
                            >
                        </div>
                        <div>
                            <label class="text-xs text-gray-500">C</label>
                            <input
                                type="text"
                                x-model="form.options.C"
                                class="w-full border border-gray-300 rounded-md px-3 py-2 text-sm focus:ring-2 focus:ring-blue-500"
                                placeholder="选项 C"
                            >
                        </div>
                        <div>
                            <label class="text-xs text-gray-500">D</label>
                            <input
                                type="text"
                                x-model="form.options.D"
                                class="w-full border border-gray-300 rounded-md px-3 py-2 text-sm focus:ring-2 focus:ring-blue-500"
                                placeholder="选项 D"
                            >
                        </div>
                    </div>
                </div>

                <!-- 答案 -->
                <div class="mb-4">
                    <label class="block text-sm font-medium text-gray-700 mb-1">答案</label>
                    <input
                        type="text"
                        x-model="form.answer"
                        class="w-full border border-gray-300 rounded-md px-3 py-2 focus:ring-2 focus:ring-blue-500"
                        placeholder="正确答案"
                    >
                </div>

                <!-- 解析 -->
                <div class="mb-6">
                    <label class="block text-sm font-medium text-gray-700 mb-1">解析/解题思路</label>
                    <textarea
                        x-model="form.solution"
                        rows="4"
                        class="w-full border border-gray-300 rounded-md px-3 py-2 focus:ring-2 focus:ring-blue-500"
                        placeholder="解题思路或解析内容"
                    ></textarea>
                </div>

                <!-- 操作按钮 -->
                <div class="flex flex-wrap gap-3">
                    <button
                        @click="previewWeb()"
                        class="px-4 py-2 bg-blue-600 text-white rounded-md hover:bg-blue-700 transition flex items-center gap-2"
                    >
                        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 12a3 3 0 11-6 0 3 3 0 016 0z"/>
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z"/>
                        </svg>
                        网页预览
                    </button>

                    <button
                        @click="previewPdf()"
                        :disabled="pdfLoading"
                        :class="pdfLoading ? 'opacity-50 cursor-wait' : ''"
                        class="px-4 py-2 bg-green-600 text-white rounded-md hover:bg-green-700 transition flex items-center gap-2"
                    >
                        <svg x-show="!pdfLoading" class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z"/>
                        </svg>
                        <svg x-show="pdfLoading" class="w-4 h-4 animate-spin" fill="none" viewBox="0 0 24 24">
                            <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
                            <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
                        </svg>
                        <span x-text="pdfLoading ? '生成中...' : 'PDF 预览'"></span>
                    </button>

                    <button
                        @click="previewBoth()"
                        :disabled="pdfLoading"
                        class="px-4 py-2 bg-purple-600 text-white rounded-md hover:bg-purple-700 transition flex items-center gap-2"
                    >
                        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 5a1 1 0 011-1h14a1 1 0 011 1v2a1 1 0 01-1 1H5a1 1 0 01-1-1V5zM4 13a1 1 0 011-1h6a1 1 0 011 1v6a1 1 0 01-1 1H5a1 1 0 01-1-1v-6zM16 13a1 1 0 011-1h2a1 1 0 011 1v6a1 1 0 01-1 1h-2a1 1 0 01-1-1v-6z"/>
                        </svg>
                        同时预览
                    </button>

                    <button
                        @click="clearForm()"
                        class="px-4 py-2 bg-gray-200 text-gray-700 rounded-md hover:bg-gray-300 transition"
                    >
                        清空
                    </button>
                </div>
            </div>

            <!-- 右侧：预览区域 -->
            <div class="space-y-6">
                <!-- 网页预览 -->
                <div x-show="showWebPreview" class="bg-white rounded-lg shadow">
                    <div class="px-4 py-3 border-b border-gray-200 flex items-center gap-2">
                        <span class="text-blue-600">
                            <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9.75 17L9 20l-1 1h8l-1-1-.75-3M3 13h18M5 17h14a2 2 0 002-2V5a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z"/>
                            </svg>
                        </span>
                        <h3 class="font-semibold text-gray-700">网页效果预览</h3>
                    </div>
                    <div id="web-preview-area" class="p-4 math-preview">
                        <!-- 题干 -->
                        <template x-if="form.stem">
                            <div class="question-stem" x-html="renderMath(form.stem)"></div>
                        </template>

                        <!-- 选项 -->
                        <template x-if="hasOptions()">
                            <div class="question-options">
                                <template x-if="form.options.A">
                                    <div class="question-option">
                                        <span class="font-medium">A.</span>
                                        <span x-html="renderMath(form.options.A)"></span>
                                    </div>
                                </template>
                                <template x-if="form.options.B">
                                    <div class="question-option">
                                        <span class="font-medium">B.</span>
                                        <span x-html="renderMath(form.options.B)"></span>
                                    </div>
                                </template>
                                <template x-if="form.options.C">
                                    <div class="question-option">
                                        <span class="font-medium">C.</span>
                                        <span x-html="renderMath(form.options.C)"></span>
                                    </div>
                                </template>
                                <template x-if="form.options.D">
                                    <div class="question-option">
                                        <span class="font-medium">D.</span>
                                        <span x-html="renderMath(form.options.D)"></span>
                                    </div>
                                </template>
                            </div>
                        </template>

                        <!-- 答案 -->
                        <template x-if="form.answer">
                            <div class="question-answer">
                                <span class="font-medium text-green-700">答案：</span>
                                <span x-html="renderMath(form.answer)"></span>
                            </div>
                        </template>

                        <!-- 解析 -->
                        <template x-if="form.solution">
                            <div class="question-solution">
                                <div class="font-medium text-gray-700 mb-2">解题思路：</div>
                                <div x-html="renderMath(form.solution)"></div>
                            </div>
                        </template>
                    </div>
                </div>

                <!-- PDF 预览 -->
                <div x-show="showPdfPreview || pdfError" class="bg-white rounded-lg shadow">
                    <div class="px-4 py-3 border-b border-gray-200 flex items-center gap-2">
                        <span class="text-green-600">
                            <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z"/>
                            </svg>
                        </span>
                        <h3 class="font-semibold text-gray-700">PDF 效果预览</h3>
                        <a x-show="pdfUrl" :href="pdfUrl" target="_blank" class="ml-auto text-sm text-blue-600 hover:underline">
                            新窗口打开
                        </a>
                    </div>
                    <div class="p-4">
                        <template x-if="pdfError">
                            <div class="text-red-600 bg-red-50 p-4 rounded">
                                <p class="font-medium">生成失败</p>
                                <p class="text-sm mt-1" x-text="pdfError"></p>
                            </div>
                        </template>
                        <template x-if="pdfUrl && !pdfError">
                            <iframe
                                :src="pdfUrl"
                                class="w-full h-[600px] border border-gray-200 rounded"
                            ></iframe>
                        </template>
                    </div>
                </div>

                <!-- 使用提示 -->
                <div x-show="!showWebPreview && !showPdfPreview && !pdfError" class="bg-gray-50 rounded-lg p-6 text-center text-gray-500">
                    <svg class="w-12 h-12 mx-auto mb-3 text-gray-300" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"/>
                    </svg>
                    <p>在左侧输入题目内容</p>
                    <p class="text-sm mt-1">点击预览按钮查看渲染效果</p>

                    <div class="mt-4 text-left text-xs text-gray-400 bg-white p-3 rounded border">
                        <p class="font-medium mb-2">支持的 LaTeX 格式：</p>
                        <ul class="space-y-1">
                            <li><code class="bg-gray-100 px-1">$...$</code> 行内公式</li>
                            <li><code class="bg-gray-100 px-1">$$...$$</code> 块级公式</li>
                            <li><code class="bg-gray-100 px-1">\(...\)</code> 行内公式（会自动转换）</li>
                            <li><code class="bg-gray-100 px-1">\[...\]</code> 块级公式（会自动转换）</li>
                        </ul>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <script>
        /**
         * 数学公式渲染器
         */
        const MathRenderer = {
            preprocessText(text) {
                let result = text;

                // 1. 处理公式内的双反斜杠 -> 单反斜杠
                result = result.replace(/\$\$([\s\S]*?)\$\$/g, (_, tex) => {
                    return '$$' + tex.replace(/\\\\/g, '\\') + '$$';
                });
                result = result.replace(/\$([^$\n]+?)\$/g, (_, tex) => {
                    return '$' + tex.replace(/\\\\/g, '\\') + '$';
                });

                // 2. 换行符处理：\n -> <br>，但保护 LaTeX 命令如 \neq, \nu
                result = result.replace(/\\n(?![a-zA-Z])/g, '<br>');

                // 3. 统一 LaTeX 分隔符格式
                result = result.replace(/\\\[([\\s\S]*?)\\\]/g, (_, tex) => `$$${tex}$$`);
                result = result.replace(/\\\(([\\s\S]*?)\\\)/g, (_, tex) => `$${tex}$`);

                return result;
            },

            render(text) {
                if (!text) return '';

                let result = this.preprocessText(text);

                // 渲染块级公式 $$...$$
                result = result.replace(/\$\$([\s\S]*?)\$\$/g, (_, tex) => {
                    try {
                        return katex.renderToString(tex.trim(), {
                            displayMode: true,
                            throwOnError: false,
                            strict: false,
                        });
                    } catch (e) {
                        console.error('KaTeX render error:', e);
                        return `<span class="text-red-500">$$${tex}$$</span>`;
                    }
                });

                // 渲染行内公式 $...$
                result = result.replace(/\$([^$\n]+?)\$/g, (_, tex) => {
                    try {
                        return katex.renderToString(tex.trim(), {
                            displayMode: false,
                            throwOnError: false,
                            strict: false,
                        });
                    } catch (e) {
                        console.error('KaTeX render error:', e);
                        return `<span class="text-red-500">$${tex}$</span>`;
                    }
                });

                return result;
            }
        };

        function questionPreview() {
            return {
                form: {
                    stem: '',
                    options: { A: '', B: '', C: '', D: '' },
                    answer: '',
                    solution: ''
                },
                showWebPreview: false,
                showPdfPreview: false,
                pdfUrl: '',
                pdfError: '',
                pdfLoading: false,

                hasOptions() {
                    return this.form.options.A || this.form.options.B || this.form.options.C || this.form.options.D;
                },

                renderMath(text) {
                    return MathRenderer.render(text);
                },

                previewWeb() {
                    if (!this.form.stem) {
                        alert('请输入题干内容');
                        return;
                    }
                    this.showWebPreview = true;
                },

                async previewPdf() {
                    if (!this.form.stem) {
                        alert('请输入题干内容');
                        return;
                    }

                    this.pdfLoading = true;
                    this.pdfError = '';
                    this.pdfUrl = '';

                    try {
                        const response = await fetch('/tools/question-preview/pdf', {
                            method: 'POST',
                            headers: {
                                'Content-Type': 'application/json',
                                'X-CSRF-TOKEN': document.querySelector('meta[name="csrf-token"]').content,
                                'Accept': 'application/json'
                            },
                            body: JSON.stringify(this.form)
                        });

                        const data = await response.json();

                        if (data.success) {
                            this.pdfUrl = data.url;
                            this.showPdfPreview = true;
                        } else {
                            this.pdfError = data.error || '生成失败';
                            this.showPdfPreview = true;
                        }
                    } catch (e) {
                        this.pdfError = e.message || '网络错误';
                        this.showPdfPreview = true;
                    } finally {
                        this.pdfLoading = false;
                    }
                },

                previewBoth() {
                    this.previewWeb();
                    this.previewPdf();
                },

                clearForm() {
                    this.form = {
                        stem: '',
                        options: { A: '', B: '', C: '', D: '' },
                        answer: '',
                        solution: ''
                    };
                    this.showWebPreview = false;
                    this.showPdfPreview = false;
                    this.pdfUrl = '';
                    this.pdfError = '';
                }
            };
        }
    </script>
</body>
</html>
