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// SPDX-License-Identifier: Apache-2.0
/**
* @module Generators/DashboardContent
* @description Pure functions for building dashboard HTML sections with
* metric cards and chart containers. Designed for agentic workflows to
* extend any article type with data dashboards using data from European
* Parliament MCP, World Bank API, or other data sources.
*
* Dashboard components:
* - **Metric cards**: Key performance indicators with trends
* - **Chart containers**: Canvas elements with embedded Chart.js configuration
* as data attributes, ready for client-side hydration
* - **Coalition panels**: Radar charts showing political group alignment
* - **Pipeline panels**: Bar charts showing legislative procedure status
* - **Trend panels**: Sparkline charts showing activity over time
* - **Stakeholder scorecards**: Color-coded impact grids
*
* Chart configurations are embedded as JSON in `data-chart-config` attributes
* on `<canvas>` elements. An external client-side initialization script
* provided by the embedding application can hydrate these using Chart.js
* at runtime by reading the `data-chart-config` attributes.
*/
import { escapeHTML } from '../utils/file-utils.js';
import {
getLocalizedString,
DASHBOARD_STRINGS,
DASHBOARD_BUILDER_STRINGS,
} from '../constants/languages.js';
import type {
DashboardConfig,
DashboardPanel,
DashboardMetric,
DashboardStrings,
ChartConfig,
CoalitionMetrics,
LegislativePipeline,
TrendAnalytics,
StakeholderMetric,
} from '../types/index.js';
// ─── Sub-section builders ────────────────────────────────────────────────────
/**
* Build a single metric card HTML.
*
* @param metric - Metric data
* @param strings - Localized dashboard strings
* @returns HTML string for one metric card
*/
function buildMetricCard(metric: DashboardMetric, strings: DashboardStrings): string {
const trendHtml = buildTrendIndicator(metric, strings);
const unitHtml = metric.unit
? ` <span class="metric-unit">${escapeHTML(metric.unit)}</span>`
: '';
return `<div class="metric-card">
<span class="metric-label">${escapeHTML(metric.label)}</span>
<span class="metric-value">${escapeHTML(metric.value)}${unitHtml}</span>
${trendHtml}
</div>`;
}
/**
* Derive trend direction from an explicit trend value or numeric change.
*
* @param trend - Explicit trend or undefined
* @param change - Numeric percentage change or undefined
* @returns Resolved trend direction
*/
function resolveTrend(
trend: DashboardMetric['trend'],
change: number | undefined
): 'up' | 'down' | 'stable' {
Eif (trend) return trend;
if (change !== undefined && change > 0) return 'up';
if (change !== undefined && change < 0) return 'down';
return 'stable';
}
/**
* Resolve the CSS class and symbol for a trend direction.
*
* @param trend - Resolved trend direction
* @returns Tuple of CSS class and display symbol
*/
function trendPresentation(trend: 'up' | 'down' | 'stable'): [string, string] {
switch (trend) {
case 'up':
return ['metric-trend-up', '↑'];
case 'down':
return ['metric-trend-down', '↓'];
case 'stable':
return ['metric-trend-stable', '→'];
}
}
/**
* Build trend indicator HTML for a metric.
*
* @param metric - Metric with optional trend and change
* @param strings - Localized dashboard strings
* @returns HTML string for trend indicator or empty string
*/
function buildTrendIndicator(metric: DashboardMetric, strings: DashboardStrings): string {
if (!metric.trend && metric.change === undefined) return '';
const trend = resolveTrend(metric.trend, metric.change);
const [trendClass, trendSymbol] = trendPresentation(trend);
const changeText =
metric.change !== undefined
? ` ${metric.change > 0 ? '+' : ''}${metric.change.toFixed(1)}%`
: '';
const directionLabel =
trend === 'up' ? strings.trendUp : trend === 'down' ? strings.trendDown : strings.trendStable;
const ariaLabel = `${strings.trendPrefix} ${directionLabel}${changeText}`;
return `<span class="${escapeHTML(trendClass)}" aria-label="${escapeHTML(ariaLabel)}">${trendSymbol}${escapeHTML(changeText)}</span>`;
}
/**
* Build a metrics grid from an array of metrics.
*
* @param metrics - Array of metric data
* @param strings - Localized dashboard strings
* @returns HTML string for the metrics grid
*/
function buildMetricsGrid(metrics: readonly DashboardMetric[], strings: DashboardStrings): string {
Iif (metrics.length === 0) return '';
const cards = metrics.map((m) => buildMetricCard(m, strings)).join('\n ');
return `<div class="metrics-grid">
${cards}
</div>`;
}
/**
* Build a chart container with embedded configuration.
* The chart configuration is serialized as JSON in a `data-chart-config`
* attribute, ready for client-side hydration by Chart.js.
*
* A `<noscript>` fallback provides an accessible data table.
*
* @param chart - Chart configuration
* @param panelIndex - Panel index for unique canvas ID
* @param strings - Localized strings
* @returns HTML string for chart container
*/
function buildChartContainer(
chart: ChartConfig,
panelIndex: number,
strings: DashboardStrings
): string {
const canvasId = `dashboard-chart-${panelIndex}`;
const safeConfig = escapeHTML(JSON.stringify(chart));
const titleHtml = chart.title ? `<h4 class="chart-title">${escapeHTML(chart.title)}</h4>` : '';
const fallbackTable = buildChartFallbackTable(chart, strings);
return `<div class="chart-container">
${titleHtml}
<canvas id="${canvasId}" class="dashboard-chart" data-chart-config="${safeConfig}" role="img" aria-label="${escapeHTML(chart.title ?? strings.chartLabel)}"></canvas>
<noscript>
${fallbackTable}
</noscript>
</div>`;
}
/**
* Build an accessible fallback data table for a chart.
* Displayed when JavaScript is disabled.
*
* @param chart - Chart configuration
* @param strings - Localized strings
* @returns HTML table string
*/
function buildChartFallbackTable(chart: ChartConfig, strings: DashboardStrings): string {
const labels = chart.data.labels;
const datasets = chart.data.datasets;
if (labels.length === 0 || datasets.length === 0) {
return `<p class="chart-no-data">${escapeHTML(strings.noChartData)}</p>`;
}
const headerCells = datasets.map((ds) => `<th scope="col">${escapeHTML(ds.label)}</th>`).join('');
const header = `<tr><th scope="col">${escapeHTML(strings.categoryLabel)}</th>${headerCells}</tr>`;
const rows = labels
.map((label, i) => {
const cells = datasets
.map((ds) => {
const val = ds.data.at(i);
return `<td>${val !== undefined ? escapeHTML(String(val)) : '—'}</td>`;
})
.join('');
return `<tr><th scope="row">${escapeHTML(label)}</th>${cells}</tr>`;
})
.join('\n ');
return `<table class="chart-fallback-table" role="table">
<thead>${header}</thead>
<tbody>
${rows}
</tbody>
</table>`;
}
/**
* Build a single dashboard panel HTML.
*
* @param panel - Panel configuration
* @param index - Panel index for unique IDs
* @param strings - Localized strings
* @returns HTML string for one panel
*/
function buildDashboardPanel(
panel: DashboardPanel,
index: number,
strings: DashboardStrings
): string {
const metricsHtml = panel.metrics ? buildMetricsGrid(panel.metrics, strings) : '';
const chartHtml = panel.chart ? buildChartContainer(panel.chart, index, strings) : '';
if (!metricsHtml && !chartHtml) return '';
return `<div class="dashboard-panel" role="region" aria-label="${escapeHTML(panel.title)}">
<h3 class="panel-title">${escapeHTML(panel.title)}</h3>
${metricsHtml}
${chartHtml}
</div>`;
}
// ─── Political intelligence panel builders ───────────────────────────────────
/**
* Map a coalition shift indicator to its CSS class.
*
* @param shift - Shift direction
* @returns CSS class string
*/
function coalitionShiftClass(shift: CoalitionMetrics['shiftIndicator']): string {
switch (shift) {
case 'strengthening':
return 'coalition-strengthening';
case 'weakening':
return 'coalition-weakening';
case 'stable':
return 'coalition-stable';
}
}
/**
* Build a coalition dynamics panel as a self-contained HTML section.
* Renders a radar chart configuration (Chart.js) embedded as a data attribute,
* with a `<noscript>` fallback table listing each bloc's alignment score.
*
* Returns an empty string when `coalition` is null/undefined or has no voting
* blocs.
*
* @param coalition - Coalition metrics data
* @param panelIndex - Index used for unique canvas IDs
* @param lang - BCP 47 language code for localized labels
* @returns HTML string for the coalition panel or empty string
*/
export function buildCoalitionPanel(
coalition: CoalitionMetrics | null | undefined,
panelIndex: number,
lang = 'en'
): string {
if (!coalition || coalition.votingBlocs.length === 0) return '';
const d = getLocalizedString(DASHBOARD_BUILDER_STRINGS, lang);
const shiftLabel =
coalition.shiftIndicator === 'strengthening'
? d.coalitionStrengthening
: coalition.shiftIndicator === 'weakening'
? d.coalitionWeakening
: d.coalitionStable;
const alignmentPct = `${coalition.alignmentScore}%`;
const shiftClass = coalitionShiftClass(coalition.shiftIndicator);
const radarChart: ChartConfig = {
type: 'radar',
title: d.coalitionRadarChart,
data: {
labels: coalition.votingBlocs.map((b) => b.group),
datasets: [
{
label: d.alignmentScore,
data: coalition.votingBlocs.map((b) => b.alignmentScore),
backgroundColor: 'rgba(0,51,153,0.2)',
borderColor: '#003399',
},
],
},
};
const canvasId = `coalition-chart-${panelIndex}`;
const safeConfig = escapeHTML(JSON.stringify(radarChart));
const noscriptRows = coalition.votingBlocs
.map(
(b) =>
`<tr><th scope="row">${escapeHTML(b.group)}</th><td>${escapeHTML(String(b.alignmentScore))}%</td></tr>`
)
.join('\n ');
return `<div class="dashboard-panel coalition-panel" role="region" aria-label="${escapeHTML(d.coalitionAlignment)}">
<h3 class="panel-title">${escapeHTML(d.coalitionAlignment)}</h3>
<div class="metrics-grid">
<div class="metric-card">
<span class="metric-label">${escapeHTML(d.alignmentScore)}</span>
<span class="metric-value">${escapeHTML(alignmentPct)}</span>
</div>
<div class="metric-card">
<span class="metric-label">${escapeHTML(d.votingBlocs)}</span>
<span class="metric-value">${escapeHTML(String(coalition.votingBlocs.length))}</span>
</div>
<div class="metric-card coalition-shift ${escapeHTML(shiftClass)}">
<span class="metric-label">${escapeHTML(d.coalitionShift)}</span>
<span class="metric-value">${escapeHTML(shiftLabel)}</span>
</div>
</div>
<div class="chart-container">
<h4 class="chart-title">${escapeHTML(d.coalitionRadarChart)}</h4>
<canvas id="${canvasId}" class="dashboard-chart" data-chart-config="${safeConfig}" role="img" aria-label="${escapeHTML(d.coalitionRadarChart)}"></canvas>
<noscript>
<table class="chart-fallback-table" role="table">
<thead><tr><th scope="col">${escapeHTML(d.votingBlocs)}</th><th scope="col">${escapeHTML(d.alignmentScore)}</th></tr></thead>
<tbody>
${noscriptRows}
</tbody>
</table>
</noscript>
</div>
</div>`;
}
/**
* Map a pipeline health score to its CSS status class.
*
* @param healthScore - Health score 0–100
* @returns CSS class string
*/
function pipelineStatusClass(healthScore: number): string {
if (healthScore >= 70) return 'pipeline-healthy';
if (healthScore >= 40) return 'pipeline-moderate';
return 'pipeline-critical';
}
/**
* Build a legislative pipeline status panel as a self-contained HTML section.
* Renders a horizontal bar chart (Chart.js) for on-track / delayed / blocked /
* fast-tracked counts with color-coded status classes and a `<noscript>`
* fallback list.
*
* Returns an empty string when `pipeline` is null/undefined or has zero total
* procedures.
*
* @param pipeline - Legislative pipeline data
* @param panelIndex - Index used for unique canvas IDs
* @param lang - BCP 47 language code for localized labels
* @returns HTML string for the pipeline panel or empty string
*/
export function buildPipelinePanel(
pipeline: LegislativePipeline | null | undefined,
panelIndex: number,
lang = 'en'
): string {
if (!pipeline || pipeline.total === 0) return '';
const d = getLocalizedString(DASHBOARD_BUILDER_STRINGS, lang);
const healthPct = `${pipeline.healthScore}%`;
const statusClass = pipelineStatusClass(pipeline.healthScore);
const barChart: ChartConfig = {
type: 'bar',
title: d.pipelineStatusChart,
data: {
labels: [d.onTrack, d.delayed, d.blocked, d.fastTracked],
datasets: [
{
label: d.procedures,
data: [pipeline.onTrack, pipeline.delayed, pipeline.blocked, pipeline.fastTracked],
backgroundColor: ['#28a745', '#ffc107', '#dc3545', '#007bff'],
},
],
},
options: {
indexAxis: 'y',
},
};
const canvasId = `pipeline-chart-${panelIndex}`;
const safeConfig = escapeHTML(JSON.stringify(barChart));
return `<div class="dashboard-panel pipeline-panel ${escapeHTML(statusClass)}" role="region" aria-label="${escapeHTML(d.pipelineStatus)}">
<h3 class="panel-title">${escapeHTML(d.pipelineStatus)}</h3>
<div class="metrics-grid">
<div class="metric-card pipeline-on-track">
<span class="metric-label">${escapeHTML(d.onTrack)}</span>
<span class="metric-value">${escapeHTML(String(pipeline.onTrack))}</span>
</div>
<div class="metric-card pipeline-delayed">
<span class="metric-label">${escapeHTML(d.delayed)}</span>
<span class="metric-value">${escapeHTML(String(pipeline.delayed))}</span>
</div>
<div class="metric-card pipeline-blocked">
<span class="metric-label">${escapeHTML(d.blocked)}</span>
<span class="metric-value">${escapeHTML(String(pipeline.blocked))}</span>
</div>
<div class="metric-card pipeline-fast-tracked">
<span class="metric-label">${escapeHTML(d.fastTracked)}</span>
<span class="metric-value">${escapeHTML(String(pipeline.fastTracked))}</span>
</div>
</div>
<div class="pipeline-health-indicator ${escapeHTML(statusClass)}">
<span class="metric-label">${escapeHTML(d.healthScore)}</span>
<span class="metric-value">${escapeHTML(healthPct)}</span>
</div>
<div class="chart-container">
<h4 class="chart-title">${escapeHTML(d.pipelineStatusChart)}</h4>
<canvas id="${canvasId}" class="dashboard-chart" data-chart-config="${safeConfig}" role="img" aria-label="${escapeHTML(d.pipelineStatusChart)}"></canvas>
<noscript>
<ul class="pipeline-fallback-list">
<li>${escapeHTML(d.onTrack)}: ${escapeHTML(String(pipeline.onTrack))}</li>
<li>${escapeHTML(d.delayed)}: ${escapeHTML(String(pipeline.delayed))}</li>
<li>${escapeHTML(d.blocked)}: ${escapeHTML(String(pipeline.blocked))}</li>
<li>${escapeHTML(d.fastTracked)}: ${escapeHTML(String(pipeline.fastTracked))}</li>
</ul>
</noscript>
</div>
</div>`;
}
/**
* Build a trend analytics panel as a self-contained HTML section.
* Renders a line (sparkline) chart (Chart.js) for activity levels over time
* with week-over-week / month-over-month change indicators and a `<noscript>`
* comparison table.
*
* Returns an empty string when `trend` is null/undefined or has no metric
* data points.
*
* @param trend - Trend analytics data
* @param panelIndex - Index used for unique canvas IDs
* @param lang - BCP 47 language code for localized labels
* @returns HTML string for the trend panel or empty string
*/
export function buildTrendPanel(
trend: TrendAnalytics | null | undefined,
panelIndex: number,
lang = 'en'
): string {
if (!trend || trend.metrics.length === 0) return '';
const d = getLocalizedString(DASHBOARD_BUILDER_STRINGS, lang);
const directionLabel =
trend.direction === 'improving'
? d.trendImproving
: trend.direction === 'declining'
? d.trendDeclining
: d.trendStableLabel;
const sparklineChart: ChartConfig = {
type: 'line',
title: d.activityTrendChart,
data: {
labels: trend.metrics.map((m) => m.period),
datasets: [
{
label: d.trendAnalysis,
data: trend.metrics.map((m) => m.value),
borderColor: '#003399',
backgroundColor: 'rgba(0,51,153,0.1)',
},
],
},
options: {
plugins: { legend: { display: false } },
scales: { y: { beginAtZero: true } },
},
};
const canvasId = `trend-chart-${panelIndex}`;
const safeConfig = escapeHTML(JSON.stringify(sparklineChart));
const wowHtml =
trend.weekOverWeekChange !== undefined
? `<div class="metric-card">
<span class="metric-label">${escapeHTML(d.weekOverWeek)}</span>
<span class="metric-value">${escapeHTML(trend.weekOverWeekChange > 0 ? '+' : '')}${escapeHTML(String(trend.weekOverWeekChange))}%</span>
</div>`
: '';
const momHtml =
trend.monthOverMonthChange !== undefined
? `<div class="metric-card">
<span class="metric-label">${escapeHTML(d.monthOverMonth)}</span>
<span class="metric-value">${escapeHTML(trend.monthOverMonthChange > 0 ? '+' : '')}${escapeHTML(String(trend.monthOverMonthChange))}%</span>
</div>`
: '';
const noscriptRows = trend.metrics
.map(
(m) =>
`<tr><th scope="row">${escapeHTML(m.period)}</th><td>${escapeHTML(String(m.value))}</td></tr>`
)
.join('\n ');
return `<div class="dashboard-panel trend-panel" role="region" aria-label="${escapeHTML(d.trendAnalysis)}">
<h3 class="panel-title">${escapeHTML(d.trendAnalysis)}</h3>
<div class="metrics-grid">
<div class="metric-card trend-direction">
<span class="metric-label">${escapeHTML(d.trendAnalysis)}</span>
<span class="metric-value">${escapeHTML(directionLabel)}</span>
</div>
${wowHtml}
${momHtml}
</div>
<div class="chart-container">
<h4 class="chart-title">${escapeHTML(d.activityTrendChart)}</h4>
<canvas id="${canvasId}" class="dashboard-chart" data-chart-config="${safeConfig}" role="img" aria-label="${escapeHTML(d.activityTrendChart)}"></canvas>
<noscript>
<table class="chart-fallback-table" role="table">
<thead><tr><th scope="col">${escapeHTML(d.trendAnalysis)}</th><th scope="col">${escapeHTML(d.status)}</th></tr></thead>
<tbody>
${noscriptRows}
</tbody>
</table>
</noscript>
</div>
</div>`;
}
/**
* Map an impact direction to its CSS class for color-coded scorecards.
*
* @param direction - Impact direction
* @returns CSS class string
*/
function impactDirectionClass(direction: StakeholderMetric['impactDirection']): string {
switch (direction) {
case 'positive':
return 'impact-positive';
case 'negative':
return 'impact-negative';
case 'neutral':
return 'impact-neutral';
}
}
/**
* Build a stakeholder impact scorecard panel as a self-contained HTML section.
* Renders a color-coded grid where each cell shows a stakeholder's impact score
* and direction, with a `<noscript>` fallback table.
*
* Returns an empty string when `stakeholders` is null/undefined or empty.
*
* @param stakeholders - Stakeholder metric data
* @param panelIndex - Index used for unique IDs
* @param lang - BCP 47 language code for localized labels
* @returns HTML string for the scorecard panel or empty string
*/
export function buildStakeholderScorecardPanel(
stakeholders: readonly StakeholderMetric[] | null | undefined,
panelIndex: number,
lang = 'en'
): string {
if (!stakeholders || stakeholders.length === 0) return '';
const d = getLocalizedString(DASHBOARD_BUILDER_STRINGS, lang);
const cards = stakeholders
.map((s) => {
const dirClass = impactDirectionClass(s.impactDirection);
const dirLabel =
s.impactDirection === 'positive'
? d.impactPositive
: s.impactDirection === 'negative'
? d.impactNegative
: d.impactNeutral;
const descHtml = s.description
? `<span class="stakeholder-description">${escapeHTML(s.description)}</span>`
: '';
return `<div class="stakeholder-card ${escapeHTML(dirClass)}" role="listitem">
<span class="stakeholder-name">${escapeHTML(s.stakeholder)}</span>
<span class="stakeholder-score">${escapeHTML(String(s.impactScore))}/100</span>
<span class="stakeholder-direction">${escapeHTML(dirLabel)}</span>
${descHtml}
</div>`;
})
.join('\n ');
const noscriptRows = stakeholders
.map((s) => {
const dirLabel =
s.impactDirection === 'positive'
? d.impactPositive
: s.impactDirection === 'negative'
? d.impactNegative
: d.impactNeutral;
return `<tr><th scope="row">${escapeHTML(s.stakeholder)}</th><td>${escapeHTML(String(s.impactScore))}</td><td>${escapeHTML(dirLabel)}</td></tr>`;
})
.join('\n ');
return `<div class="dashboard-panel stakeholder-scorecard" role="region" aria-label="${escapeHTML(d.stakeholderImpact)}" id="stakeholder-scorecard-${panelIndex}">
<h3 class="panel-title">${escapeHTML(d.stakeholderImpact)}</h3>
<div class="stakeholder-grid" role="list">
${cards}
</div>
<noscript>
<table class="chart-fallback-table" role="table">
<thead><tr><th scope="col">${escapeHTML(d.stakeholderImpact)}</th><th scope="col">${escapeHTML(d.impactScore)}</th><th scope="col">${escapeHTML(d.status)}</th></tr></thead>
<tbody>
${noscriptRows}
</tbody>
</table>
</noscript>
</div>`;
}
// ─── Main builder ────────────────────────────────────────────────────────────
/**
* Build a complete dashboard section HTML.
*
* Generates an accessible dashboard with metric cards and chart containers.
* Charts are embedded as Canvas elements with `data-chart-config` JSON
* attributes for client-side Chart.js hydration. A `<noscript>` fallback
* provides accessible data tables when JavaScript is disabled.
*
* Returns an empty string if the config is null/undefined or contains
* no panels with content.
*
* @param config - Dashboard configuration (null/undefined returns empty string)
* @param lang - BCP 47 language code for localized UI text (defaults to "en")
* @param heading - Optional custom section heading override
* @returns HTML section string or empty string
*/
export function buildDashboardSection(
config: DashboardConfig | null | undefined,
lang: string = 'en',
heading?: string
): string {
if (!config) return '';
if (config.panels.length === 0) return '';
const strings: DashboardStrings = getLocalizedString(DASHBOARD_STRINGS, lang);
const sectionHeading = heading ?? config.title ?? strings.sectionHeading;
const panelsHtml = config.panels
.map((panel, index) => buildDashboardPanel(panel, index, strings))
.filter((html) => html.length > 0)
.join('\n ');
Iif (!panelsHtml) return '';
return `
<section class="dashboard" role="region" aria-label="${escapeHTML(sectionHeading)}">
<h2>${escapeHTML(sectionHeading)}</h2>
<div class="dashboard-grid">
${panelsHtml}
</div>
</section>`;
}
/**
* Check whether a dashboard configuration contains any chart containers.
* Useful for conditionally including Chart.js client-side scripts.
*
* @param config - Dashboard configuration
* @returns True if at least one panel has a chart
*/
export function dashboardHasCharts(config: DashboardConfig | null | undefined): boolean {
if (!config) return false;
return config.panels.some((panel) => panel.chart !== undefined);
}
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