{% extends "layout.html" %}

{% block title %}世系查询 - 家谱管理系统{% endblock %}

{% block extra_css %}
<style>
    .empty-state {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        height: 60vh;
        color: rgba(255,255,255,0.5);
    }
    
    .tree-container {
        padding: 20px;
        min-height: 60vh;
        background: #1a1a2e;
        border-radius: 12px;
        border: 1px solid rgba(255,215,0,0.2);
    }
    
    /* Tree node styles */
    .tree-wrapper {
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 20px 0;
    }
    
    .tree-node {
        background: linear-gradient(135deg, #2d3436, #1e272e);
        border: 2px solid #4a69bd;
        border-radius: 8px;
        padding: 12px 24px;
        margin: 10px 0;
        text-align: center;
        min-width: 160px;
        transition: all 0.3s;
        cursor: pointer;
        box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    }
    
    .tree-node:hover {
        background: linear-gradient(135deg, #4a69bd, #2d3436);
        transform: scale(1.05);
        box-shadow: 0 6px 20px rgba(74, 105, 189, 0.4);
    }
    
    .tree-node.center {
        background: linear-gradient(135deg, #ffd700, #ff8c00);
        border-color: #ffd700;
        box-shadow: 0 0 30px rgba(255,215,0,0.5);
    }
    
    .tree-node.center .node-name {
        color: #1a1a2e !important;
    }
    
    .tree-node.center .node-name.simplified {
        color: rgba(26,26,46,0.8) !important;
    }
    
    .tree-node.center .node-info {
        color: rgba(26,26,46,0.8) !important;
    }
    
    .tree-node.direct-ancestor {
        background: linear-gradient(135deg, #4a90d9, #2d5a87);
        border-color: #4a90d9;
        box-shadow: 0 0 20px rgba(74, 144, 217, 0.4);
    }
    
    .tree-node.direct-ancestor .node-name {
        color: #fff !important;
    }
    
    .tree-node.direct-ancestor .node-name.simplified {
        color: rgba(255,255,255,0.8) !important;
    }
    
    .tree-node.direct-ancestor .node-info {
        color: rgba(255,255,255,0.9) !important;
    }
    
    .tree-node.clickable {
        cursor: pointer;
        transition: transform 0.2s, box-shadow 0.2s;
    }
    
    .tree-node.clickable:hover {
        transform: translateY(-3px);
        box-shadow: 0 8px 25px rgba(255, 255, 255, 0.15);
    }
    
    .node-name {
        font-size: 18px;
        font-weight: 700;
        color: #fff;
        margin-bottom: 4px;
    }
    
    .node-name.simplified {
        font-size: 13px;
        color: rgba(255,255,255,0.7);
    }
    
    .node-info {
        font-size: 12px;
        color: rgba(255,255,255,0.8);
        font-weight: 500;
    }
    
    /* Connection lines */
    .connection-line {
        width: 4px;
        height: 40px;
        background: linear-gradient(to bottom, #4a90d9, #2d3436);
        margin: 0 auto;
        border-radius: 2px;
    }
    
    .connection-line.vertical-line {
        width: 4px;
        height: 40px;
        background: linear-gradient(to bottom, #4a90d9, #2d3436);
        margin: 0 auto;
        border-radius: 2px;
    }
    
    .connection-line.horizontal {
        width: 60px;
        height: 4px;
        margin: 8px auto;
        background: linear-gradient(to right, #4a69bd, #2d3436);
    }
    
    .connection-line.horizontal.main-line {
        width: 60px;
        height: 4px;
        margin: 8px auto;
        background: linear-gradient(to right, #4a90d9, #4a90d9);
    }
    
    /* Children container */
    .children-container {
        display: flex;
        flex-wrap: nowrap;
        justify-content: flex-start;
        gap: 30px;
        margin-top: 20px;
        align-items: flex-start;
        min-width: max-content;
    }
    
    .child-group {
        display: flex;
        flex-direction: column;
        align-items: center;
        flex-shrink: 0;
    }
    
    .child-group.direct-line {
        display: flex;
        flex-direction: column;
        align-items: center;
        flex-shrink: 0;
        position: relative;
    }
    
    /* Expand/Collapse button */
    .expand-btn {
        background: linear-gradient(135deg, #4a69bd, #2d3436);
        border: 2px solid #4a69bd;
        border-radius: 50%;
        width: 36px;
        height: 36px;
        color: #fff;
        font-size: 18px;
        font-weight: bold;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 15px auto;
        transition: all 0.3s;
        box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }
    
    .expand-btn:hover {
        background: linear-gradient(135deg, #ffd700, #ff8c00);
        border-color: #ffd700;
        transform: rotate(90deg);
        box-shadow: 0 4px 15px rgba(255,215,0,0.4);
    }
    
    /* Generation label */
    .generation-label {
        color: #ffd700;
        font-size: 16px;
        font-weight: 700;
        margin-bottom: 20px;
        text-align: center;
        padding: 10px 20px;
        background: rgba(255,215,0,0.1);
        border: 1px solid rgba(255,215,0,0.3);
        border-radius: 25px;
        display: inline-block;
    }
    
    /* Search box */
    .search-box {
        max-width: 350px;
    }
    
    /* Section styling */
    .ancestors-section, .children-section {
        margin: 30px 0;
    }
    
    /* Header styling */
    .page-header {
        color: #ffd700;
        font-size: 24px;
        font-weight: 700;
        text-shadow: 0 0 10px rgba(255,215,0,0.3);
    }
    
    /* Tree container with scrollable area */
    .tree-container {
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
        border-radius: 16px;
        padding: 30px;
        overflow: auto;
        position: relative;
        box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
        width: calc(100% + 2px);
        margin: 0 -1px;
    }
    
    .tree-container::-webkit-scrollbar {
        width: 8px;
        height: 8px;
    }
    
    .tree-container::-webkit-scrollbar-track {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 4px;
    }
    
    .tree-container::-webkit-scrollbar-thumb {
        background: rgba(255, 215, 0, 0.5);
        border-radius: 4px;
    }
    
    .tree-container::-webkit-scrollbar-thumb:hover {
        background: rgba(255, 215, 0, 0.7);
    }
    
    /* Tree wrapper for horizontal scrolling */
    .tree-wrapper {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 10px;
        scrollbar-width: thin;
        scrollbar-color: rgba(255,215,0,0.5) rgba(255,255,255,0.1);
    }
    
    .tree-wrapper::-webkit-scrollbar {
        width: 8px;
        height: 8px;
    }
    
    .tree-wrapper::-webkit-scrollbar-track {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 4px;
    }
    
    .tree-wrapper::-webkit-scrollbar-thumb {
        background: rgba(255, 215, 0, 0.5);
        border-radius: 4px;
    }
    
    /* Generation row wrapper */
    .generation-row {
        display: flex;
        justify-content: center;
        width: 100%;
        overflow-x: auto;
    }
    
    /* Adoption styles */
    .tree-node.adopted-out {
        border: 2px dashed #ff6b6b !important;
        background: rgba(255, 107, 107, 0.1) !important;
    }
    
    .tree-node.adopted-in {
        border: 2px solid #4ecdc4 !important;
        background: rgba(78, 205, 196, 0.1) !important;
    }
    
    .adoption-label {
        font-size: 10px;
        color: #ff6b6b;
        font-weight: bold;
        margin-top: 4px;
        text-align: center;
    }
</style>
{% endblock %}

{% block content %}
<div class="container-fluid">
    <!-- Header -->
    <div class="row mb-6">
        <div class="col-md-12">
            <div class="d-flex justify-content-between align-items-center">
                <h2 class="page-header">世系查询</h2>
                <div class="search-box">
                    <div class="input-group">
                        <input type="text" id="searchInput" class="form-control" placeholder="搜索成员姓名（支持简繁）" />
                        <button class="btn btn-primary" onclick="searchMember()">
                            <i class="bi bi-search"></i>
                        </button>
                    </div>
                </div>
            </div>
        </div>
    </div>
    
    <!-- Main Content -->
    <div class="row">
        <div class="col-md-12">
            <div id="treeContent">
                <!-- Empty State -->
                <div class="empty-state" id="emptyState">
                    <i class="bi bi-search text-6xl mb-4"></i>
                    <p class="text-lg">请在右上角搜索框中输入成员姓名</p>
                    <p class="text-sm mt-2">支持简体和繁体姓名搜索</p>
                </div>
                
                <!-- Tree View -->
                <div id="treeView" style="display: none;" class="tree-container">
                    <!-- Ancestors Section -->
                    <div class="ancestors-section" id="ancestorsTree"></div>
                    
                    <!-- Siblings and Center Person Section -->
                    <div class="siblings-section" id="siblingsTree"></div>
                    
                    <!-- Children Section -->
                    <div class="children-section" id="childrenTree"></div>
                </div>
            </div>
        </div>
    </div>
</div>

<script>
// Search member
async function searchMember() {
    const keyword = document.getElementById('searchInput').value.trim();
    if (!keyword) {
        alert('请输入搜索关键词');
        return;
    }
    
    // Show loading state
    const searchBtn = document.querySelector('.search-box button');
    const originalBtnHtml = searchBtn.innerHTML;
    searchBtn.disabled = true;
    searchBtn.innerHTML = '<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>';
    
    try {
        const response = await fetch('/manager/api/search_member', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ keyword: keyword }),
            credentials: 'include'
        });
        
        const result = await response.json();
        if (result.success && result.members) {
            if (result.members.length === 1) {
                // Only one match, load directly
                document.getElementById('emptyState').style.display = 'none';
                document.getElementById('treeView').style.display = 'block';
                await loadLineage(result.members[0].id);
            } else {
                // Multiple matches, show selection dialog
                showMemberSelection(result.members);
            }
        } else {
            alert('未找到匹配的成员');
        }
    } finally {
        // Restore button
        searchBtn.disabled = false;
        searchBtn.innerHTML = originalBtnHtml;
    }
}

// Show member selection dialog
function showMemberSelection(members) {
    // Remove existing dialog
    const existingDialog = document.getElementById('memberSelectionDialog');
    if (existingDialog) {
        existingDialog.remove();
    }
    
    // Store members in sessionStorage
    sessionStorage.setItem('searchMembers', JSON.stringify(members));
    
    // Create dialog
    const dialog = document.createElement('div');
    dialog.id = 'memberSelectionDialog';
    dialog.style.cssText = `
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        background: #1a1a2e;
        border: 2px solid #4a69bd;
        border-radius: 12px;
        padding: 24px;
        z-index: 10000;
        min-width: 400px;
        box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    `;
    
    // Dialog content
    dialog.innerHTML = `
        <h3 style="color: #ffd700; margin-bottom: 16px; text-align: center;">找到多个匹配成员，请输入编号选择：</h3>
        <div style="margin-bottom: 16px; max-height: 200px; overflow-y: auto;">
            ${members.map((member, index) => `
                <div style="padding: 10px; border-bottom: 1px solid rgba(255,255,255,0.1);">
                    <span style="color: #ffd700; margin-right: 10px;">${index + 1}.</span>
                    <span style="color: #fff; font-weight: 600;">${member.name}</span>
                    ${member.simplified_name && member.simplified_name !== member.name ? 
                        `<span style="color: rgba(255,255,255,0.7);">(${member.simplified_name})</span>` : ''}
                </div>
            `).join('')}
        </div>
        <input type="text" id="selectionInput" 
               placeholder="请输入编号选择（1-${members.length}）"
               style="width: 100%; padding: 10px; margin-bottom: 16px; 
                      background: #2d3436; border: 1px solid #4a69bd; 
                      border-radius: 8px; color: #fff; text-align: center;
                      font-size: 16px;" />
        <div style="display: flex; justify-content: center; gap: 16px;">
            <button onclick="selectMember()" 
                    style="padding: 10px 30px; background: linear-gradient(135deg, #4a69bd, #2d3436); 
                           border: 2px solid #4a69bd; border-radius: 8px; color: #fff;
                           cursor: pointer; font-weight: 600;">确定</button>
            <button onclick="closeSelectionDialog()" 
                    style="padding: 10px 30px; background: #2d3436; 
                           border: 2px solid #666; border-radius: 8px; color: #aaa;
                           cursor: pointer;">取消</button>
        </div>
    `;
    
    // Add overlay
    const overlay = document.createElement('div');
    overlay.id = 'dialogOverlay';
    overlay.style.cssText = `
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.7);
        z-index: 9999;
    `;
    overlay.onclick = closeSelectionDialog;
    
    document.body.appendChild(overlay);
    document.body.appendChild(dialog);
    
    // Focus input
    document.getElementById('selectionInput').focus();
    
    // Enter key
    document.getElementById('selectionInput').addEventListener('keypress', function(e) {
        if (e.key === 'Enter') {
            selectMember();
        }
    });
}

// Close selection dialog
function closeSelectionDialog() {
    document.getElementById('memberSelectionDialog')?.remove();
    document.getElementById('dialogOverlay')?.remove();
}

// Select member
function selectMember() {
    const input = document.getElementById('selectionInput');
    const index = parseInt(input.value) - 1;
    
    const membersStr = sessionStorage.getItem('searchMembers');
    if (!membersStr) {
        alert('数据错误，请重新搜索');
        closeSelectionDialog();
        return;
    }
    
    const members = JSON.parse(membersStr);
    
    if (index >= 0 && index < members.length) {
        // Load lineage for selected member
        document.getElementById('emptyState').style.display = 'none';
        document.getElementById('treeView').style.display = 'block';
        loadLineage(members[index].id);
        
        // Close dialog
        closeSelectionDialog();
    } else {
        alert(`请输入有效的编号（1-${members.length}）`);
    }
}

// Load lineage data
async function loadLineage(memberId) {
    // Show loading state - preserve container elements
    document.getElementById('ancestorsTree').innerHTML = `
        <div style="display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px;">
            <div class="spinner-border text-yellow-400" style="width: 3rem; height: 3rem;" role="status">
                <span class="visually-hidden">Loading...</span>
            </div>
            <p class="mt-4 text-white text-lg">正在加载祖先数据...</p>
        </div>
    `;
    document.getElementById('siblingsTree').innerHTML = `
        <div style="display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px;">
            <div class="spinner-border text-yellow-400" style="width: 3rem; height: 3rem;" role="status">
                <span class="visually-hidden">Loading...</span>
            </div>
            <p class="mt-4 text-white text-lg">正在加载同辈数据...</p>
        </div>
    `;
    document.getElementById('childrenTree').innerHTML = `
        <div style="display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px;">
            <div class="spinner-border text-yellow-400" style="width: 3rem; height: 3rem;" role="status">
                <span class="visually-hidden">Loading...</span>
            </div>
            <p class="mt-4 text-white text-lg">正在加载后代数据...</p>
        </div>
    `;
    
    try {
        const response = await fetch(`/manager/api/get_lineage/${memberId}`, {
            credentials: 'include'
        });
        
        const result = await response.json();
        if (result.success) {
            console.log('Lineage data received:', result.data);
            // Use requestAnimationFrame for smoother rendering
            requestAnimationFrame(() => {
                renderLineage(result.data);
            });
        } else {
            console.error('API error:', result.message);
            document.getElementById('ancestorsTree').innerHTML = '';
            document.getElementById('siblingsTree').innerHTML = `
                <div style="display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 200px;">
                    <i class="bi bi-x-circle text-red-500 text-6xl mb-4"></i>
                    <p class="text-white text-lg">加载失败</p>
                    <p class="text-gray-400 text-sm">${result.message || '服务器错误，请稍后重试'}</p>
                </div>
            `;
            document.getElementById('childrenTree').innerHTML = '';
        }
    } catch (error) {
        console.error('Fetch error:', error);
        document.getElementById('ancestorsTree').innerHTML = '';
        document.getElementById('siblingsTree').innerHTML = `
            <div style="display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 200px;">
                <i class="bi bi-x-circle text-red-500 text-6xl mb-4"></i>
                <p class="text-white text-lg">加载失败</p>
                <p class="text-gray-400 text-sm">网络错误: ${error.message}</p>
            </div>
        `;
        document.getElementById('childrenTree').innerHTML = '';
    }
}

// Render lineage tree
function renderLineage(data) {
    console.log('Rendering lineage:', data);
    
    try {
        const generationsHtml = renderGenerations(data.generations);
        console.log('Generations HTML generated:', generationsHtml.length);
        document.getElementById('ancestorsTree').innerHTML = generationsHtml;
    } catch (e) {
        console.error('Error rendering generations:', e);
    }
    
    try {
        const siblingsWithCenterHtml = renderSiblingsWithCenter(data.center, data.siblings);
        console.log('Siblings HTML generated:', siblingsWithCenterHtml.length);
        document.getElementById('siblingsTree').innerHTML = siblingsWithCenterHtml;
    } catch (e) {
        console.error('Error rendering siblings:', e);
    }
    
    try {
        const childrenHtml = renderChildrenTree(data.children);
        console.log('Children HTML generated:', childrenHtml.length);
        document.getElementById('childrenTree').innerHTML = childrenHtml;
    } catch (e) {
        console.error('Error rendering children:', e);
    }
}

// Render generations with ancestors and their siblings
function renderGenerations(generations) {
    if (!generations || generations.length === 0) return '';
    
    let html = '<div class="text-center mb-6"><span class="generation-label">祖先谱系</span></div>';
    html += '<div class="tree-wrapper">';
    
    const reversedGenerations = [...generations].reverse();
    
    reversedGenerations.forEach((gen, index) => {
        if (index > 0) {
            html += '<div class="connection-line vertical-line"></div>';
        }
        
        const leftSiblings = gen.siblings.slice(0, Math.floor(gen.siblings.length / 2));
        const rightSiblings = gen.siblings.slice(Math.floor(gen.siblings.length / 2));
        
        html += `
            <div class="generation-row">
                <div class="children-container">
                    ${leftSiblings.map(sibling => `
                        <div class="child-group">
                            <div class="connection-line horizontal"></div>
                            ${renderTreeNode(sibling, false, false)}
                            ${sibling.has_children ? `
                                <button class="expand-btn" onclick="toggleChildren(this, ${sibling.id})">+</button>
                                <div class="children-container" style="display: none;" data-parent-id="${sibling.id}">
                                </div>
                            ` : ''}
                        </div>
                    `).join('')}
                    <div class="child-group direct-line">
                        <div class="connection-line horizontal main-line"></div>
                        ${renderTreeNode(gen.ancestor, false, true)}
                        ${gen.ancestor.show_expand ? `
                        <button class="expand-btn" onclick="toggleChildren(this, ${gen.ancestor.id})">+</button>
                        <div class="children-container" style="display: none;" data-parent-id="${gen.ancestor.id}">
                        </div>
                    ` : ''}
                </div>
                ${rightSiblings.map(sibling => `
                    <div class="child-group">
                        <div class="connection-line horizontal"></div>
                        ${renderTreeNode(sibling, false, false)}
                        ${sibling.has_children ? `
                            <button class="expand-btn" onclick="toggleChildren(this, ${sibling.id})">+</button>
                            <div class="children-container" style="display: none;" data-parent-id="${sibling.id}">
                            </div>
                        ` : ''}
                    </div>
                `).join('')}
                </div>
            </div>
        `;
    });
    
    html += '</div>';
    return html;
}

// Render center person
function renderCenterPerson(person) {
    return `
        <div class="connection-line"></div>
        <div class="tree-node center">
            <div class="node-name">${person.name}</div>
            ${person.simplified_name && person.simplified_name !== person.name ? `<div class="node-name simplified">(${person.simplified_name})</div>` : ''}
            <div class="node-info">
                ${person.name_word ? `${person.name_word} · ` : ''}
                ${person.name_word_generation || ''}
            </div>
        </div>
    `;
}

// Render siblings with center person in the middle
function renderSiblingsWithCenter(center, siblings) {
    const allSiblings = siblings || [];
    
    // Insert center person at the middle position
    const middleIndex = Math.floor(allSiblings.length / 2);
    const items = [];
    
    for (let i = 0; i < allSiblings.length; i++) {
        if (i === middleIndex) {
            items.push({ type: 'center', person: center });
        }
        items.push({ type: 'sibling', person: allSiblings[i] });
    }
    
    // If no siblings, just show center
    if (allSiblings.length === 0) {
        items.push({ type: 'center', person: center });
    }
    
    return `
        <div class="text-center mt-6 mb-4"><span class="generation-label">同辈兄弟姐妹</span></div>
        <div class="generation-row">
            <div class="children-container">
                ${items.map(item => `
                    <div class="child-group ${item.type === 'center' ? 'center-child' : ''}">
                    <div class="connection-line horizontal"></div>
                    ${renderTreeNode(item.person, item.type === 'center')}
                    ${item.type !== 'center' && item.person.has_children ? `
                        <button class="expand-btn" onclick="toggleChildren(this, ${item.person.id})">+</button>
                        <div class="children-container" style="display: none;" data-parent-id="${item.person.id}">
                        </div>
                    ` : ''}
                    </div>
                `).join('')}
                </div>
            </div>
    `;
}

// Render children tree
function renderChildrenTree(children) {
    if (!children || children.length === 0) return '';
    
    return `
        <div class="text-center mt-6 mb-4"><span class="generation-label">后代谱系</span></div>
        <div class="generation-row">
            ${renderChildrenRecursive(children)}
        </div>
    `;
}

// Render children recursively
function renderChildrenRecursive(children, level = 0) {
    if (!children || children.length === 0) return '';
    
    return `
        <div class="children-container">
            ${children.map(child => `
                <div class="child-group">
                    <div class="connection-line"></div>
                    ${renderTreeNode(child, false)}
                    ${child.has_children ? `
                        <button class="expand-btn" onclick="toggleChildren(this, ${child.id})">+</button>
                        <div class="children-container" style="display: none;" data-parent-id="${child.id}">
                        </div>
                    ` : ''}
                </div>
            `).join('')}
        </div>
    `;
}

// Render tree node
function renderTreeNode(person, isCenter = false, isDirectLine = false) {
    let className = 'clickable ';
    if (isCenter) className += 'center';
    else if (isDirectLine) className += 'direct-ancestor';
    else className = className.trim();
    
    // Add adoption styles
    if (person.sub_relation_type === 2) {
        className += ' adopted-out'; // 出继
    } else if (person.sub_relation_type === 3) {
        className += ' adopted-in'; // 入继
    }
    
    // 出继方显示"出继给xxx"
    const adoptionLabel = person.sub_relation_type === 2 && person.adoptive_parent_name 
        ? `<div class="adoption-label">出继给 ${person.adoptive_parent_name}</div>` 
        : (person.sub_relation_type === 2 ? '<div class="adoption-label">出继</div>' : '');
    
    return `
        <div class="tree-node ${className}" data-id="${person.id}" onclick="openPersonDetail(${person.id})">
            <div class="node-name">${person.name}</div>
            ${person.simplified_name && person.simplified_name !== person.name ? `<div class="node-name simplified">(${person.simplified_name})</div>` : ''}
            <div class="node-info">
                ${person.name_word ? `${person.name_word} · ` : ''}
                ${person.name_word_generation || ''}
            </div>
            ${adoptionLabel}
        </div>
    `;
}

// Open person detail in new tab
function openPersonDetail(personId) {
    window.open(`/manager/member_detail/${personId}`, '_blank');
}

// Toggle children visibility with lazy loading
async function toggleChildren(btn, parentId) {
    const container = btn.nextElementSibling;
    const isExpanded = container.style.display !== 'none';
    
    if (isExpanded) {
        container.style.display = 'none';
        btn.innerHTML = '+';
    } else {
        // Check if children are already loaded
        if (container.innerHTML.trim() === '') {
            // Load children lazily
            btn.innerHTML = '<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>';
            
            // Get already displayed descendant IDs to exclude
            const excludedIds = getExcludedDescendantIds(btn);
            const excludeParam = excludedIds.length > 0 ? `?exclude=${excludedIds.join(',')}` : '';
            
            console.log(`[ToggleChildren] Parent ID: ${parentId}, Excluded IDs: ${excludedIds}, URL: /manager/api/get_descendants/${parentId}${excludeParam}`);
            
            try {
                const response = await fetch(`/manager/api/get_descendants/${parentId}${excludeParam}`, {
                    credentials: 'include'
                });
                const result = await response.json();
                
                if (result.success && result.children) {
                    // Render children
                    container.innerHTML = renderChildrenRecursive(result.children);
                }
            } catch (error) {
                console.error('Failed to load children:', error);
            } finally {
                btn.innerHTML = '−';
            }
        }
        
        container.style.display = 'flex';
        btn.innerHTML = '−';
    }
}

// Get descendant IDs that are already displayed in the tree (to avoid duplicates)
function getExcludedDescendantIds(btn) {
    const excluded = new Set();
    
    // Helper function to extract IDs from tree nodes
    const extractIdsFromNodes = (container) => {
        if (!container) return;
        const nodes = container.querySelectorAll('.tree-node');
        nodes.forEach(node => {
            const id = node.getAttribute('data-id');
            if (id && !isNaN(parseInt(id))) {
                excluded.add(parseInt(id));
            }
        });
    };
    
    // Get IDs from ancestors tree
    const ancestorsTree = document.getElementById('ancestorsTree');
    extractIdsFromNodes(ancestorsTree);
    
    // Get IDs from siblings tree (center person and siblings)
    const siblingsTree = document.getElementById('siblingsTree');
    extractIdsFromNodes(siblingsTree);
    
    // Get IDs from children tree
    const childrenTree = document.getElementById('childrenTree');
    extractIdsFromNodes(childrenTree);
    
    console.log('Excluded IDs:', Array.from(excluded));
    return Array.from(excluded);
}

// Enter key search
document.getElementById('searchInput').addEventListener('keypress', function(e) {
    if (e.key === 'Enter') {
        searchMember();
    }
});
</script>
{% endblock %}