Add timeline view with stacked bar chart and view switcher

Adds a second visualization mode showing spending across all months
as a stacked bar chart, with a месяц/таймлайн switcher in the header.
Includes side panel with category breakdowns, bar click-to-drill,
and localStorage persistence of the selected view.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app.js

@@ -37,6 +37,7 @@ const myChart = echarts.init(chartDom);
 let option;
 let originalSunburstData = null; // Stores the original data for the current month (for reset on center click)
 let showDefaultView = null; // Reference to reset details panel to default view
+let currentView = 'month';  // 'month' | 'timeline'
 
 // Drill-down history for back/forward navigation
 let drillDownHistory = [];
@@ -455,6 +456,210 @@ function transformToSunburst(data) {
     };
 }
 
+// Build ECharts stacked bar option for timeline view
+function buildTimelineOption() {
+    const months = availableMonths;
+    const xLabels = months.map(m => formatMonthLabel(m));
+
+    // Collect per-category totals for each month
+    const categoryTotals = {}; // { categoryName: [amountForMonth0, amountForMonth1, ...] }
+
+    months.forEach((month, mi) => {
+        const data = monthDataCache[month];
+        if (!data) return;
+        data.forEach(item => {
+            const cat = item.category || '';
+            if (!cat) return;
+            const amount = Math.abs(parseFloat(item.amount_rub));
+            if (isNaN(amount)) return;
+            if (!categoryTotals[cat]) {
+                categoryTotals[cat] = new Array(months.length).fill(0);
+            }
+            categoryTotals[cat][mi] += amount;
+        });
+    });
+
+    // Build series in categoryOrder, then append any unknown categories
+    const seriesList = [];
+    const usedCategories = new Set();
+
+    categoryOrder.forEach((catName, ci) => {
+        if (!categoryTotals[catName]) return;
+        usedCategories.add(catName);
+        seriesList.push({
+            name: catName,
+            type: 'bar',
+            stack: 'total',
+            barMaxWidth: 50,
+            barCategoryGap: '35%',
+            data: categoryTotals[catName],
+            itemStyle: { color: categoryColors[ci] }
+        });
+    });
+
+    // Unknown categories (not in categoryOrder)
+    Object.keys(categoryTotals).forEach(catName => {
+        if (usedCategories.has(catName)) return;
+        seriesList.push({
+            name: catName,
+            type: 'bar',
+            stack: 'total',
+            barMaxWidth: 50,
+            barCategoryGap: '35%',
+            data: categoryTotals[catName]
+        });
+    });
+
+    return {
+        backgroundColor: '#fff',
+        tooltip: { show: false },
+        grid: {
+            left: 30,
+            right: '28%',
+            top: 30,
+            bottom: 30,
+            containLabel: true
+        },
+        xAxis: {
+            type: 'category',
+            data: xLabels,
+            axisLabel: { fontSize: 11 }
+        },
+        yAxis: {
+            type: 'value',
+            axisLabel: {
+                formatter: function(val) {
+                    if (val >= 1000) return Math.round(val / 1000) + 'k';
+                    return val;
+                },
+                fontSize: 11
+            }
+        },
+        series: seriesList
+    };
+}
+
+// Update details panel for timeline view
+function updateTimelineDetails(monthIndex) {
+    const detailsHeader = document.getElementById('details-header');
+    const topItemsEl = document.getElementById('top-items');
+
+    // Reset header to clean state (remove any eye buttons from sunburst mode)
+    detailsHeader.innerHTML = '<span class="hover-name"></span><span class="hover-amount"></span>';
+    const hoverName = detailsHeader.querySelector('.hover-name');
+    const hoverAmount = detailsHeader.querySelector('.hover-amount');
+
+    let monthLabel, data;
+    if (monthIndex === null || monthIndex === undefined) {
+        monthLabel = 'Все месяцы';
+        data = [];
+        for (const month of availableMonths) {
+            if (monthDataCache[month]) data.push(...monthDataCache[month]);
+        }
+    } else {
+        const month = availableMonths[monthIndex];
+        monthLabel = formatMonthLabel(month);
+        data = monthDataCache[month] || [];
+    }
+
+    // Compute category totals
+    const catTotals = {};
+    let total = 0;
+    data.forEach(item => {
+        const cat = item.category || '';
+        if (!cat) return;
+        const amount = Math.abs(parseFloat(item.amount_rub));
+        if (isNaN(amount)) return;
+        catTotals[cat] = (catTotals[cat] || 0) + amount;
+        total += amount;
+    });
+
+    hoverName.textContent = monthLabel;
+    hoverAmount.textContent = formatRUB(total) + '\u202F₽';
+
+    // Sort by value descending
+    const sorted = Object.entries(catTotals).sort((a, b) => b[1] - a[1]);
+
+    topItemsEl.innerHTML = '';
+    sorted.forEach(([cat, amount]) => {
+        const pct = ((amount / total) * 100).toFixed(1);
+        const colorIdx = categoryOrder.indexOf(cat);
+        const color = colorIdx !== -1 ? categoryColors[colorIdx] : '#999';
+
+        const item = document.createElement('div');
+        item.className = 'top-item';
+        item.innerHTML = `<span class="top-item-name"><span class="color-circle" style="background: ${color}"></span>${cat}</span><span class="top-item-percent">${pct}%</span><span class="top-item-amount">${formatRUB(amount)}\u202F₽</span>`;
+        topItemsEl.appendChild(item);
+    });
+}
+
+// Switch between month (sunburst) and timeline (stacked bar) views
+function switchView(viewName) {
+    if (viewName === currentView) return;
+    currentView = viewName;
+
+    // Update switcher button active state
+    document.querySelectorAll('.view-switcher-btn').forEach(btn => {
+        btn.classList.toggle('active', btn.dataset.view === viewName);
+    });
+
+    const container = document.querySelector('.container');
+
+    if (viewName === 'timeline') {
+        container.classList.add('timeline-mode');
+        // Remove all chart event listeners
+        myChart.off('click');
+        myChart.off('mouseover');
+        myChart.off('mouseout');
+        myChart.off('globalout');
+        // Resize after layout change, then render stacked bar
+        myChart.resize();
+        myChart.setOption(buildTimelineOption(), true);
+
+        // Hover events update the details panel
+        myChart.on('mouseover', function(params) {
+            if (params.componentType === 'series') {
+                updateTimelineDetails(params.dataIndex);
+            }
+        });
+        myChart.on('globalout', function() {
+            updateTimelineDetails(null);
+        });
+        // Show aggregate by default
+        updateTimelineDetails(null);
+
+        // Click handler: clicking a bar switches to month view for that month
+        myChart.on('click', function(params) {
+            if (params.componentType === 'series') {
+                const monthIndex = params.dataIndex;
+                if (monthIndex >= 0 && monthIndex < availableMonths.length) {
+                    selectedMonthIndices.clear();
+                    selectedMonthIndices.add(monthIndex);
+                    currentMonthIndex = monthIndex;
+                    switchView('month');
+                    selectMonth(monthIndex);
+                    saveMonthSelectionState();
+                }
+            }
+        });
+    } else {
+        container.classList.remove('timeline-mode');
+        // Remove all chart event listeners
+        myChart.off('click');
+        myChart.off('mouseover');
+        myChart.off('mouseout');
+        myChart.off('globalout');
+        // Clear chart completely so no bar chart remnants remain
+        myChart.clear();
+        option = null;
+        // Resize after layout change, then re-render sunburst from scratch
+        myChart.resize();
+        renderSelectedMonths();
+    }
+
+    saveMonthSelectionState();
+}
+
 // Function to get Russian month name from YYYY-MM format
 function getRussianMonthName(dateStr) {
     const monthNum = parseInt(dateStr.split('-')[1]);
@@ -1080,7 +1285,8 @@ function saveMonthSelectionState() {
         localStorage.setItem(MONTH_SELECTION_STORAGE_KEY, JSON.stringify({
             currentMonth,
             selectedMonths,
-            drillPath: [...currentDrillPath]
+            drillPath: [...currentDrillPath],
+            view: currentView
         }));
     } catch (error) {
         // Ignore storage failures (private mode, disabled storage, etc.)
@@ -1120,6 +1326,11 @@ function restoreMonthSelectionState() {
             currentDrillPath = [];
         }
 
+        // Defer timeline restore so chart is initialized first
+        if (saved.view === 'timeline') {
+            requestAnimationFrame(() => switchView('timeline'));
+        }
+
         return true;
     } catch (error) {
         return false;
@@ -1575,6 +1786,13 @@ async function loadAvailableMonths() {
             }
         });
     }
+
+    // Set up view switcher
+    document.querySelectorAll('.view-switcher-btn').forEach(btn => {
+        btn.addEventListener('click', () => {
+            switchView(btn.dataset.view);
+        });
+    });
 }
 
 // Transform children data for drill-down (extracted from click handler)
@@ -2076,10 +2294,10 @@ initVisualization();
 
 // Handle window resize
 window.addEventListener('resize', function() {
+    if (currentView === 'month') {
         adjustChartSize();
+    }
     myChart.resize();
-    
-    // Recalculate chart center and radius for hover detection will be done automatically by setupHoverEvents
 });
 
 // Function to adjust chart size based on screen width

index.html

@@ -12,6 +12,10 @@
     <div class="container">
         <div class="header">
             <h1>Семейные траты</h1>
+            <div class="view-switcher" id="view-switcher">
+                <button class="view-switcher-btn active" data-view="month">месяц</button>
+                <button class="view-switcher-btn" data-view="timeline">таймлайн</button>
+            </div>
             <div class="month-navigator">
                 <button class="nav-arrow nav-prev" id="prev-month">&#8249;</button>
                 <div class="month-list" id="month-list"></div>

styles.css

@@ -18,8 +18,8 @@ body {
 
 .header {
     display: flex;
-    justify-content: space-between;
     align-items: center;
+    gap: 16px;
     margin-bottom: 20px;
 }
 
@@ -29,6 +29,7 @@ body {
     align-items: center;
     gap: 8px;
     max-width: 60%;
+    margin-left: auto;
 }
 
 .nav-arrow {
@@ -127,6 +128,62 @@ body {
     font-size: 12px;
 }
 
+/* View switcher */
+.view-switcher {
+    display: inline-flex;
+    gap: 4px;
+}
+
+.view-switcher-btn {
+    background: none;
+    border: none;
+    border-bottom: 2px solid transparent;
+    padding: 4px 8px;
+    font-size: 14px;
+    font-family: inherit;
+    color: #999;
+    cursor: pointer;
+    transition: color 0.2s, border-color 0.2s;
+}
+
+.view-switcher-btn:hover {
+    color: #666;
+}
+
+.view-switcher-btn.active {
+    color: #333;
+    border-bottom-color: #333;
+}
+
+/* Timeline mode modifiers */
+.container.timeline-mode #center-label,
+.container.timeline-mode #chart-eye-btn {
+    display: none !important;
+}
+
+.container.timeline-mode .month-navigator {
+    visibility: hidden;
+    pointer-events: none;
+}
+
+.container.timeline-mode .chart-wrapper {
+    width: 100%;
+}
+
+.container.timeline-mode #details-box {
+    position: absolute;
+    top: 20px;
+    right: 30px;
+    width: 280px;
+    min-width: 0;
+    max-width: 280px;
+    background: transparent;
+    box-shadow: none;
+    border: none;
+    opacity: 1;
+    z-index: 10;
+}
+
 .content-wrapper {
     display: flex;
     position: relative;
@@ -347,7 +404,48 @@ body {
 
 
 @media (max-width: 850px) {
+    .view-switcher {
+        position: fixed;
+        bottom: 0;
+        left: 0;
+        right: 0;
+        z-index: 900;
+        background: rgba(255, 255, 255, 0.95);
+        backdrop-filter: blur(10px);
+        -webkit-backdrop-filter: blur(10px);
+        display: flex;
+        justify-content: center;
+        gap: 0;
+        padding: 8px 16px;
+        padding-bottom: calc(8px + env(safe-area-inset-bottom));
+        border-top: 1px solid #e0e0e0;
+    }
+
+    .view-switcher-btn {
+        flex: 1;
+        max-width: 160px;
+        padding: 8px 16px;
+        border-radius: 20px;
+        border-bottom: none;
+        font-size: 14px;
+        font-weight: 500;
+        text-align: center;
+        color: #666;
+        background: transparent;
+    }
+
+    .view-switcher-btn.active {
+        background: #333;
+        color: #fff;
+        border-bottom: none;
+    }
+
+    .container {
+        padding-bottom: calc(70px + env(safe-area-inset-bottom));
+    }
+
     .header {
+        display: flex;
         flex-direction: column;
         align-items: flex-start;
         gap: 15px;
@@ -378,6 +476,23 @@ body {
         overflow-y: auto;
     }
 
+    .container.timeline-mode .chart-wrapper {
+        width: 100%;
+    }
+
+    .container.timeline-mode #details-box {
+        position: relative;
+        top: auto;
+        right: auto;
+        width: 100%;
+        min-width: 100%;
+        max-width: none;
+        background: white;
+        box-shadow: 0 2px 15px rgba(0, 0, 0, 0.15);
+        border: 1px solid #eee;
+        margin-top: 15px;
+    }
+
     .top-item-amount {
         min-width: 80px;
     }