// app/static/js/research-tree.js

function renderTree(session, outline) {
    const container = document.getElementById('treeContainer');
    if (!container) {
        console.error('Tree container not found!');
        return;
    }
    
    container.innerHTML = '';
    
    // 根节点 - 始终显示
    const rootNode = document.createElement('div');
    rootNode.className = 'root-node';
    rootNode.innerHTML = `
        <h2>${session.question || '研究问题'}</h2>
        <p>状态：${getStatusText(session.status)} | 
           开始时间：${new Date(session.created_at).toLocaleString()}</p>
        ${session.error_message ? `<p style="color: #ff6b6b;">错误: ${session.error_message}</p>` : ''}
    `;
    container.appendChild(rootNode);
    
    // 如果出错，显示错误信息
    if (session.status === 'error') {
        const errorNode = createTreeNode('研究出现错误', 'error');
        container.appendChild(wrapInTreeNode(errorNode));
        return;
    }
    
    // 研究准备节点
    const prepNode = createTreeNode('研究准备', session.refined_questions ? 'completed' : session.status);
    prepNode.onclick = () => showDetail('preparation', session);
    
    if (session.refined_questions) {
        const content = document.createElement('div');
        content.className = 'node-content expanded';
        content.innerHTML = `
            <div class="phase-card">
                <h4>🎯 问题细化</h4>
                <ul>
                    ${session.refined_questions.map(q => `<li>• ${q}</li>`).join('')}
                </ul>
            </div>
        `;
        prepNode.querySelector('.node-card').appendChild(content);
    }
    
    container.appendChild(wrapInTreeNode(prepNode));
    
    // 大纲节点
    if (outline) {
        const outlineNode = createTreeNode('研究大纲', 'completed');
        const outlineContent = document.createElement('div');
        outlineContent.className = 'node-content expanded';
        outlineContent.innerHTML = `
            <div class="phase-card">
                <h4>📋 主要研究问题</h4>
                <ul>
                    ${outline.research_questions.map(q => `<li>• ${q}</li>`).join('')}
                </ul>
            </div>
        `;
        outlineNode.querySelector('.node-card').appendChild(outlineContent);
        
        const outlineWrapper = wrapInTreeNode(outlineNode);
        container.appendChild(outlineWrapper);
        
        // 子主题节点
        outline.sub_topics.forEach((subtopic, idx) => {
            const subtopicNode = createSubtopicNode(subtopic, idx + 1);
            outlineWrapper.appendChild(wrapInTreeNode(subtopicNode, true));
        });
    } else {
        // 显示大纲创建中或失败
        const outlineStatus = session.status === 'outlining' ? 'processing' : 
                            session.status === 'error' ? 'error' : 'pending';
        const outlineNode = createTreeNode('研究大纲', outlineStatus);
        container.appendChild(wrapInTreeNode(outlineNode));
    }
    
    // 最终报告节点
    const reportNode = createTreeNode('研究报告生成', session.final_report ? 'completed' : 'pending');
    container.appendChild(wrapInTreeNode(reportNode));
}

function createTreeNode(title, status) {
    const node = document.createElement('div');
    const statusInfo = getStatusInfo(status);
    
    node.innerHTML = `
        <div class="node-card ${statusInfo.className}">
            <div class="node-header">
                <div class="node-title-wrapper">
                    <span class="node-title">${title}</span>
                </div>
                <div class="node-status">
                    <span class="status-icon ${statusInfo.className}">${statusInfo.icon}</span>
                </div>
            </div>
        </div>
    `;
    
    return node;
}

function createSubtopicNode(subtopic, index) {
    const node = document.createElement('div');
    const statusInfo = getStatusInfo(subtopic.status);
    
    node.innerHTML = `
        <div class="node-card ${statusInfo.className}" onclick="showDetail('subtopic', ${JSON.stringify(subtopic).replace(/"/g, '&quot;')})">
            <div class="node-header">
                <div class="node-title-wrapper">
                    <span class="node-title">子主题${index}：${subtopic.topic}</span>
                </div>
                <div class="node-status">
                    <span class="priority-badge ${subtopic.priority}">
                        ${subtopic.priority === 'high' ? '高' : subtopic.priority === 'medium' ? '中' : '低'}优先级
                    </span>
                    <span class="status-icon ${statusInfo.className}">${statusInfo.icon}</span>
                </div>
            </div>
        </div>
    `;
    
    return node;
}

function wrapInTreeNode(node, isSubtopic = false) {
    const wrapper = document.createElement('div');
    wrapper.className = 'tree-node' + (isSubtopic ? ' subtopic-node' : '');
    wrapper.appendChild(node);
    return wrapper;
}

function getStatusInfo(status) {
    const statusMap = {
        'pending': { icon: '○', className: 'pending' },
        'analyzing': { icon: '●', className: 'processing' },
        'outlining': { icon: '●', className: 'processing' },
        'researching': { icon: '●', className: 'processing' },
        'writing': { icon: '●', className: 'processing' },
        'reviewing': { icon: '●', className: 'processing' },
        'completed': { icon: '✓', className: 'completed' },
        'error': { icon: '✗', className: 'error' },
        'cancelled': { icon: '⊘', className: 'cancelled' }
    };
    return statusMap[status] || statusMap['pending'];
}