{% extends 'admin/base.html' %}

{% block title %}{% if article %}编辑文章{% else %}新建文章{% endif %}{% endblock %}
{% block page_title %}{% if article %}编辑文章{% else %}新建文章{% endif %}{% endblock %}

{% block extra_css %}
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/highlight.js@11.9.0/styles/github.min.css">
<link rel="stylesheet" href="{{ url_for('static', filename='css/markdown.css') }}">
<style>
.editor-container {
    display: flex;
    gap: 20px;
    min-height: 500px;
}

.editor-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.editor-pane textarea {
    flex: 1;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.95em;
    line-height: 1.5;
    padding: 15px;
    border: 1px solid var(--admin-border);
    border-radius: 4px;
    resize: vertical;
}

.preview-pane {
    flex: 1;
    background: #fff;
    border: 1px solid var(--admin-border);
    border-radius: 4px;
    padding: 15px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.preview-pane h3 {
    margin-bottom: 15px;
    color: #666;
    font-size: 0.9em;
    padding-bottom: 8px;
    border-bottom: 1px solid #eee;
}

.editor-toolbar {
    margin-bottom: 10px;
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.editor-toolbar button {
    padding: 5px 10px;
    background: #f0f0f0;
    border: 1px solid #ddd;
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s;
}

.editor-toolbar button:hover {
    background: #e0e0e0;
}

.mode-toggle {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.mode-toggle button {
    padding: 8px 20px;
    background: #f8f9fa;
    border: 1px solid var(--admin-border);
    border-radius: 4px;
    cursor: pointer;
}

.mode-toggle button.active {
    background: var(--admin-primary);
    color: #fff;
    border-color: var(--admin-primary);
}

/* 图片上传区域 */
.upload-area {
    border: 2px dashed var(--admin-border);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    margin-bottom: 15px;
    background: #f8f9fa;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-area:hover {
    border-color: var(--admin-primary);
    background: #e8f4fc;
}

.upload-area.dragover {
    border-color: var(--admin-primary);
    background: #d4edda;
}

.upload-area input[type="file"] {
    display: none;
}

/* 参考来源 */
.references-section {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
}

.reference-item {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
}

.reference-item input {
    flex: 1;
}

/* 附件 */
.attachments-section {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 15px;
}

.attachment-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: #fff;
    border-radius: 4px;
    margin-bottom: 8px;
}

.attachment-info {
    display: flex;
    gap: 15px;
    align-items: center;
}

.attachment-info .filename {
    font-weight: 500;
}

.attachment-info .filesize {
    color: var(--admin-text-light);
    font-size: 0.85em;
}

/* 进度条 */
.upload-progress {
    width: 100%;
    height: 4px;
    background: #e0e0e0;
    border-radius: 2px;
    overflow: hidden;
    display: none;
}

.upload-progress-bar {
    height: 100%;
    background: var(--admin-primary);
    width: 0;
    transition: width 0.3s;
}
</style>
{% endblock %}

{% block extra_js %}
<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/highlight.js@11.9.0/highlight.min.js"></script>
<script>
// 配置 marked
marked.setOptions({
    highlight: function(code, lang) {
        if (lang && hlse.getLanguage(lang)) {
            try {
                return hlse.highlight(code, { language: lang }).value;
            } catch (e) {}
        }
        return hlse.highlightAuto(code).value;
    },
    breaks: true,
    gfm: true
});

let editorMode = 'split';
const editor = document.getElementById('content');
const previewContent = document.getElementById('preview-content');

// 实时预览
function updatePreview() {
    const markdown = editor.value;
    previewContent.innerHTML = marked.parse(markdown);
}

// 编辑器模式切换
function setEditorMode(mode) {
    editorMode = mode;
    const editPane = document.querySelector('.editor-pane');
    const previewPane = document.querySelector('.preview-pane');
    const buttons = document.querySelectorAll('.mode-toggle button');
    
    buttons.forEach(btn => btn.classList.remove('active'));
    document.querySelector(`.mode-toggle button[data-mode="${mode}"]`).classList.add('active');
    
    if (mode === 'edit') {
        editPane.style.flex = '1';
        editPane.style.display = 'flex';
        previewPane.style.display = 'none';
    } else if (mode === 'preview') {
        editPane.style.display = 'none';
        previewPane.style.flex = '1';
        previewPane.style.display = 'flex';
        updatePreview();
    } else {
        editPane.style.flex = '1';
        editPane.style.display = 'flex';
        previewPane.style.flex = '1';
        previewPane.style.display = 'flex';
    }
}

// Markdown 快捷插入
function insertMarkdown(before, after = '') {
    const start = editor.selectionStart;
    const end = editor.selectionEnd;
    const text = editor.value;
    const selected = text.substring(start, end);
    
    editor.value = text.substring(0, start) + before + selected + after + text.substring(end);
    editor.focus();
    editor.setSelectionRange(start + before.length, start + before.length + selected.length);
    updatePreview();
}

// 插入图片到编辑器
function insertImage(url) {
    const imageUrl = `![image](${url})\n`;
    insertMarkdown(imageUrl, '');
}

// 图片上传
const uploadArea = document.getElementById('upload-area');
const fileInput = document.getElementById('image-upload');

if (uploadArea) {
    // 点击上传
    uploadArea.addEventListener('click', () => fileInput.click());
    
    // 拖拽上传
    uploadArea.addEventListener('dragover', (e) => {
        e.preventDefault();
        uploadArea.classList.add('dragover');
    });
    
    uploadArea.addEventListener('dragleave', () => {
        uploadArea.classList.remove('dragover');
    });
    
    uploadArea.addEventListener('drop', (e) => {
        e.preventDefault();
        uploadArea.classList.remove('dragover');
        const files = e.dataTransfer.files;
        if (files.length > 0) {
            uploadImage(files[0]);
        }
    });
    
    // 文件选择
    fileInput.addEventListener('change', (e) => {
        if (e.target.files.length > 0) {
            uploadImage(e.target.files[0]);
        }
    });
}

// 粘贴上传
editor.addEventListener('paste', (e) => {
    const items = e.clipboardData.items;
    for (let item of items) {
        if (item.type.indexOf('image') !== -1) {
            const file = item.getAsFile();
            uploadImage(file, true);
            e.preventDefault();
            break;
        }
    }
});

// 上传图片
function uploadImage(file, isPaste = false) {
    const formData = new FormData();
    formData.append('file', file);
    formData.append('article_id', '{{ article.id if article else "" }}');
    
    if (isPaste) {
        // 粘贴图片转Base64上传
        const reader = new FileReader();
        reader.onload = (e) => {
            formData.delete('file');
            formData.append('image_data', e.target.result);
            fetch('{{ url_for("admin.upload_paste") }}', {
                method: 'POST',
                body: formData
            })
            .then(res => res.json())
            .then(data => {
                if (data.success) {
                    insertImage(data.url);
                    updatePreview();
                }
            });
        };
        reader.readAsDataURL(file);
    } else {
        // 普通文件上传
        fetch('{{ url_for("admin.upload_image") }}', {
            method: 'POST',
            body: formData
        })
        .then(res => res.json())
        .then(data => {
            if (data.success) {
                insertImage(data.url);
                updatePreview();
            }
        });
    }
}

// 参考来源管理
let references = {% if references %}[
    {% for ref in references %}
    {"id": {{ ref.id }}, "title": "{{ ref.title | e }}", "url": "{{ ref.url or '' | e }}", "description": "{{ ref.description or '' | e }}"}
    {% if not loop.last %},
    {% endif %}
    {% endfor %}
]{% else %}[]{% endif %};

function addReference() {
    references.push({id: null, title: '', url: '', description: ''});
    renderReferences();
}

function removeReference(index) {
    references.splice(index, 1);
    renderReferences();
}

function updateReference(index, field, value) {
    references[index][field] = value;
    document.getElementById('references-json').value = JSON.stringify(references);
}

function renderReferences() {
    const container = document.getElementById('references-list');
    container.innerHTML = references.map((ref, i) => `
        <div class="reference-item">
            <input type="text" placeholder="来源标题" value="${ref.title}" onchange="updateReference(${i}, 'title', this.value)">
            <input type="url" placeholder="链接URL" value="${ref.url}" onchange="updateReference(${i}, 'url', this.value)">
            <input type="text" placeholder="描述" value="${ref.description}" onchange="updateReference(${i}, 'description', this.value)">
            <button type="button" onclick="removeReference(${i})" class="btn btn-sm btn-danger">删除</button>
        </div>
    `).join('');
    document.getElementById('references-json').value = JSON.stringify(references);
}

renderReferences();

// 监听编辑器变化
editor.addEventListener('input', updatePreview);

// 初始化预览
updatePreview();

// 附件上传函数
{% if article %}
function uploadAttachment() {
    const formData = new FormData();
    formData.append('article_id', document.getElementById('attachment-article-id').value);
    formData.append('file', document.getElementById('attachment-upload-file').files[0]);
    formData.append('description', document.getElementById('attachment-desc').value);
    
    fetch('{{ url_for("admin.upload_attachment") }}', {
        method: 'POST',
        body: formData
    })
    .then(res => res.json())
    .then(data => {
        if (data.success) {
            location.reload();
        }
    });
}

function deleteAttachment(id) {
    if (confirm('确定删除此附件？')) {
        fetch(`/admin/attachment/${id}/delete`, {method: 'POST'})
        .then(res => res.json())
        .then(data => {
            if (data.success) {
                location.reload();
            }
        });
    }
}
{% endif %}
</script>
{% endblock %}

{% block content %}
<form method="POST" class="article-form">
    <input type="hidden" id="references-json" name="references" value="[{% for ref in references %}{"id": {{ ref.id }}, "title": "{{ ref.title | e }}", "url": "{{ ref.url or '' | e }}", "description": "{{ ref.description or '' | e }}"}{% if not loop.last %}, {% endif %}{% endfor %}]">
    
    <div class="form-row">
        <div class="form-group flex-grow">
            <label for="title">标题 *</label>
            <input type="text" id="title" name="title" required
                   value="{{ article.title if article else '' }}">
        </div>
        
        <div class="form-group">
            <label for="author_id">作者</label>
            <select id="author_id" name="author_id">
                <option value="">未指定</option>
                {% for author in authors %}
                <option value="{{ author.id }}" 
                        {% if article and article.author_id == author.id %}selected{% endif %}>
                    {{ author.name }}
                </option>
                {% endfor %}
            </select>
            <a href="{{ url_for('admin.authors') }}" style="font-size: 0.85em;">管理作者</a>
        </div>
        
        <div class="form-group">
            <label for="category_id">分类</label>
            <select id="category_id" name="category_id">
                <option value="">无分类</option>
                {% for cat in categories %}
                <option value="{{ cat.id }}" 
                        {% if article and article.category_id == cat.id %}selected{% endif %}>
                    {{ cat.name }}
                </option>
                {% endfor %}
            </select>
        </div>
    </div>
    
    <div class="form-group">
        <label for="summary">摘要</label>
        <textarea id="summary" name="summary" rows="2" placeholder="文章简介，用于列表展示和SEO">{{ article.summary if article else '' }}</textarea>
    </div>
    
    <div class="form-group">
        <label for="cover_image">封面图片URL</label>
        <input type="url" id="cover_image" name="cover_image"
               value="{{ article.cover_image if article else '' }}"
               placeholder="https://example.com/image.jpg">
    </div>
    
    <!-- 图片上传区域 -->
    <div class="upload-area" id="upload-area">
        <input type="file" id="image-upload" accept="image/*">
        <p>📷 点击、拖拽或粘贴图片到编辑器中上传</p>
        <p style="font-size: 0.85em; color: #666;">支持 PNG, JPG, GIF, WebP 格式，最大 10MB</p>
    </div>
    
    <div class="form-group">
        <label>内容 * (Markdown 格式)</label>
        
        <!-- 编辑模式切换 -->
        <div class="mode-toggle">
            <button type="button" data-mode="split" onclick="setEditorMode('split')" class="active">📝 编辑+预览</button>
            <button type="button" data-mode="edit" onclick="setEditorMode('edit')">✏️ 仅编辑</button>
            <button type="button" data-mode="preview" onclick="setEditorMode('preview')">👁️ 仅预览</button>
        </div>
        
        <!-- Markdown 快捷工具栏 -->
        <div class="editor-toolbar">
            <button type="button" onclick="insertMarkdown('**', '**')" title="粗体"><strong>B</strong></button>
            <button type="button" onclick="insertMarkdown('*', '*')" title="斜体"><em>I</em></button>
            <button type="button" onclick="insertMarkdown('~~', '~~')" title="删除线"><s>S</s></button>
            <button type="button" onclick="insertMarkdown('# ', '')" title="标题1">H1</button>
            <button type="button" onclick="insertMarkdown('## ', '')" title="标题2">H2</button>
            <button type="button" onclick="insertMarkdown('### ', '')" title="标题3">H3</button>
            <button type="button" onclick="insertMarkdown('> ', '')" title="引用">❝</button>
            <button type="button" onclick="insertMarkdown('- ', '')" title="列表">•</button>
            <button type="button" onclick="insertMarkdown('1. ', '')" title="有序列表">1.</button>
            <button type="button" onclick="insertMarkdown('```\\n', '\\n```')" title="代码块">{ }</button>
            <button type="button" onclick="insertMarkdown('`', '`')" title="行内代码">`</button>
            <button type="button" onclick="insertMarkdown('[', '](url)')" title="链接">🔗</button>
            <button type="button" onclick="insertMarkdown('![alt](', ')')" title="图片">🖼</button>
            <button type="button" onclick="insertMarkdown('---\\n', '')" title="分隔线">—</button>
        </div>
        
        <!-- 编辑器和预览区域 -->
        <div class="editor-container">
            <div class="editor-pane">
                <textarea id="content" name="content" rows="25" required
                          placeholder="使用 Markdown 格式编写文章内容...\n\n支持直接粘贴图片！">{{ article.content if article else '' }}</textarea>
            </div>
            
            <div class="preview-pane">
                <h3>📖 实时预览</h3>
                <div id="preview-content" class="markdown-body"></div>
            </div>
        </div>
    </div>
    
    <!-- 参考来源 -->
    <div class="references-section">
        <h4>📚 参考来源</h4>
        <div id="references-list"></div>
        <button type="button" onclick="addReference()" class="btn btn-sm btn-secondary">+ 添加参考来源</button>
    </div>
    
    <!-- 附件 -->
    {% if article %}
    <div class="attachments-section">
        <h4>📎 文章附件</h4>
        <div id="attachments-list">
            {% for att in attachments %}
            <div class="attachment-item">
                <div class="attachment-info">
                    <span class="filename">{{ att.filename }}</span>
                    <span class="filesize">{{ att.get_filesize_display() }}</span>
                </div>
                <div>
                    <a href="/uploads/{{ att.filename }}" target="_blank" class="btn btn-sm">下载</a>
                    <button type="button" onclick="deleteAttachment({{ att.id }})" class="btn btn-sm btn-danger">删除</button>
                </div>
            </div>
            {% endfor %}
        </div>
        <div class="attachment-upload-area">
            <input type="hidden" id="attachment-article-id" value="{{ article.id }}">
            <input type="file" id="attachment-upload-file">
            <input type="text" id="attachment-desc" placeholder="文件描述（可选）" style="display: inline-block; width: 200px;">
            <button type="button" onclick="uploadAttachment()" class="btn btn-sm btn-secondary">上传附件</button>
        </div>
    </div>
    {% endif %}
    
    <div class="form-group">
        <label>标签</label>
        <div class="checkbox-group">
            {% for tag in tags %}
            <label class="checkbox-label">
                <input type="checkbox" name="tags" value="{{ tag.id }}"
                       {% if article and tag in article.tags %}checked{% endif %}>
                {{ tag.name }}
            </label>
            {% endfor %}
        </div>
    </div>
    
    <div class="form-group">
        <label class="checkbox-label">
            <input type="checkbox" name="is_published" 
                   {% if article and article.is_published %}checked{% endif %}>
            立即发布
        </label>
    </div>
    
    <div class="form-actions">
        <button type="submit" class="btn btn-primary">
            {% if article %}保存修改{% else %}创建文章{% endif %}
        </button>
        <a href="{{ url_for('admin.articles') }}" class="btn btn-secondary">取消</a>
        {% if article and article.is_published %}
        <a href="{{ url_for('frontend.article', slug=article.slug) }}" target="_blank" class="btn btn-secondary">查看文章</a>
        {% endif %}
    </div>
</form>
{% endblock %}