Add budget-allocator-server example
Demo MCP App for interactive budget allocation with: - Slider controls for 5 categories (Marketing, Engineering, etc.) - Real-time donut chart visualization via Chart.js - 24-month sparkline trends per category - Industry benchmark percentile badges - Company stage selector (Seed through Growth) - Budget preset buttons ($50K-$500K) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Jonathan Hefner
parent
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commit
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1 changed files with 1648 additions and 0 deletions
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examples/budget-allocator-server/src/mcp-app.ts
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628
examples/budget-allocator-server/src/mcp-app.ts
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/**
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* Budget Allocator App - Interactive budget allocation with real-time visualization
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*/
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import { App, PostMessageTransport } from "@modelcontextprotocol/ext-apps";
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import { Chart, registerables } from "chart.js";
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import "./global.css";
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import "./mcp-app.css";
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// Register Chart.js components
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Chart.register(...registerables);
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const log = {
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info: console.log.bind(console, "[APP]"),
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error: console.error.bind(console, "[APP]"),
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};
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// ---------------------------------------------------------------------------
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// Types
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// ---------------------------------------------------------------------------
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interface BudgetCategory {
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id: string;
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name: string;
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color: string;
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defaultPercent: number;
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}
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interface BenchmarkPercentiles {
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p25: number;
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p50: number;
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p75: number;
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}
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interface StageBenchmark {
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stage: string;
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categoryBenchmarks: Record<string, BenchmarkPercentiles>;
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}
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interface BudgetConfig {
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categories: BudgetCategory[];
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presetBudgets: number[];
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defaultBudget: number;
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currency: string;
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currencySymbol: string;
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}
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interface HistoricalMonth {
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month: string;
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allocations: Record<string, number>;
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}
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interface BudgetAnalytics {
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history: HistoricalMonth[];
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benchmarks: StageBenchmark[];
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stages: string[];
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defaultStage: string;
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}
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interface BudgetDataResponse {
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config: BudgetConfig;
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analytics: BudgetAnalytics;
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}
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interface AppState {
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config: BudgetConfig | null;
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analytics: BudgetAnalytics | null;
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totalBudget: number;
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allocations: Map<string, number>;
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selectedStage: string;
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chart: Chart<"doughnut"> | null;
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}
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// ---------------------------------------------------------------------------
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// State
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// ---------------------------------------------------------------------------
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const state: AppState = {
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config: null,
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analytics: null,
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totalBudget: 100000,
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allocations: new Map(),
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selectedStage: "Series A",
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chart: null,
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};
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// ---------------------------------------------------------------------------
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// DOM References
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// ---------------------------------------------------------------------------
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const budgetSelector = document.getElementById(
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"budget-selector",
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) as HTMLSelectElement;
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const stageSelector = document.getElementById(
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"stage-selector",
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) as HTMLSelectElement;
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const slidersContainer = document.getElementById("sliders-container")!;
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const statusBar = document.getElementById("status-bar")!;
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const comparisonSummary = document.getElementById("comparison-summary")!;
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const chartCanvas = document.getElementById(
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"budget-chart",
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) as HTMLCanvasElement;
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// ---------------------------------------------------------------------------
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// Utility Functions
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// ---------------------------------------------------------------------------
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function formatCurrency(amount: number): string {
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const symbol = state.config?.currencySymbol ?? "$";
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if (amount >= 1000) {
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return `${symbol}${Math.round(amount / 1000)}K`;
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}
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return `${symbol}${amount.toLocaleString()}`;
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}
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function formatCurrencyFull(amount: number): string {
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const symbol = state.config?.currencySymbol ?? "$";
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return `${symbol}${amount.toLocaleString()}`;
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}
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// ---------------------------------------------------------------------------
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// Sparkline Rendering (Custom Canvas)
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// ---------------------------------------------------------------------------
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function drawSparkline(
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canvas: HTMLCanvasElement,
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data: number[],
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color: string,
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): void {
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const ctx = canvas.getContext("2d");
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if (!ctx || data.length < 2) return;
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const width = canvas.width;
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const height = canvas.height;
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const padding = 2;
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// Clear canvas
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ctx.clearRect(0, 0, width, height);
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// Calculate min/max for scaling
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const min = Math.min(...data) - 2;
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const max = Math.max(...data) + 2;
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const range = max - min || 1;
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// Draw area fill
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ctx.beginPath();
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ctx.moveTo(padding, height - padding);
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data.forEach((value, i) => {
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const x = padding + (i / (data.length - 1)) * (width - 2 * padding);
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const y =
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height - padding - ((value - min) / range) * (height - 2 * padding);
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ctx.lineTo(x, y);
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});
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ctx.lineTo(width - padding, height - padding);
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ctx.closePath();
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ctx.fillStyle = `${color}20`; // 12.5% opacity
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ctx.fill();
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// Draw line
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ctx.beginPath();
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data.forEach((value, i) => {
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const x = padding + (i / (data.length - 1)) * (width - 2 * padding);
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const y =
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height - padding - ((value - min) / range) * (height - 2 * padding);
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if (i === 0) ctx.moveTo(x, y);
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else ctx.lineTo(x, y);
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});
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ctx.strokeStyle = color;
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ctx.lineWidth = 1.5;
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ctx.stroke();
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}
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// ---------------------------------------------------------------------------
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// Percentile Calculation
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// ---------------------------------------------------------------------------
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function calculatePercentile(
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value: number,
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benchmarks: BenchmarkPercentiles,
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): number {
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// Interpolate percentile based on value position relative to p25, p50, p75
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if (value <= benchmarks.p25) {
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return 25 * (value / benchmarks.p25);
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}
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if (value <= benchmarks.p50) {
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return (
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25 + 25 * ((value - benchmarks.p25) / (benchmarks.p50 - benchmarks.p25))
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);
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}
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if (value <= benchmarks.p75) {
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return (
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50 + 25 * ((value - benchmarks.p50) / (benchmarks.p75 - benchmarks.p50))
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);
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}
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// Above p75
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const extraRange = benchmarks.p75 - benchmarks.p50;
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return 75 + 25 * Math.min(1, (value - benchmarks.p75) / extraRange);
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}
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function getPercentileClass(percentile: number): string {
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if (percentile >= 40 && percentile <= 60) return "percentile-normal";
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if (percentile > 60) return "percentile-high";
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return "percentile-low";
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}
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function formatPercentileBadge(percentile: number): string {
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const rounded = Math.round(percentile);
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if (percentile >= 40 && percentile <= 60) return `${rounded}th`;
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if (percentile > 60) return `${rounded}th`;
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return `${rounded}th`;
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}
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function getPercentileIcon(percentile: number): string {
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if (percentile >= 40 && percentile <= 60) return "";
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if (percentile > 60) return "";
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return "";
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}
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// ---------------------------------------------------------------------------
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// Chart Initialization
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// ---------------------------------------------------------------------------
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function initChart(categories: BudgetCategory[]): Chart<"doughnut"> {
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const isDarkMode = window.matchMedia("(prefers-color-scheme: dark)").matches;
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return new Chart(chartCanvas, {
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type: "doughnut",
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data: {
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labels: categories.map((c) => c.name),
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datasets: [
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{
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data: categories.map(
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(c) => state.allocations.get(c.id) ?? c.defaultPercent,
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),
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backgroundColor: categories.map((c) => c.color),
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borderWidth: 2,
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borderColor: isDarkMode ? "#1f2937" : "#ffffff",
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},
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],
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},
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options: {
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responsive: true,
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maintainAspectRatio: true,
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cutout: "60%",
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plugins: {
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legend: { display: false },
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tooltip: {
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callbacks: {
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label: (ctx) => {
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const pct = ctx.parsed;
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const amt = (pct / 100) * state.totalBudget;
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return `${ctx.label}: ${pct.toFixed(1)}% (${formatCurrency(amt)})`;
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},
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},
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},
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},
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onClick: (_event, elements) => {
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if (elements.length > 0 && state.config) {
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const index = elements[0].index;
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focusSlider(state.config.categories[index].id);
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}
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},
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onHover: (_event, elements) => {
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if (elements.length > 0 && state.config) {
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highlightSlider(state.config.categories[elements[0].index].id);
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} else {
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clearSliderHighlight();
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}
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},
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},
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});
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}
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function updateChart(): void {
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if (!state.chart || !state.config) return;
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const data = state.config.categories.map(
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(c) => state.allocations.get(c.id) ?? 0,
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);
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state.chart.data.datasets[0].data = data;
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state.chart.update("none");
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}
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// ---------------------------------------------------------------------------
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// Slider Management
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// ---------------------------------------------------------------------------
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function createSliderRow(
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category: BudgetCategory,
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historyData: number[],
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): HTMLElement {
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const allocation =
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state.allocations.get(category.id) ?? category.defaultPercent;
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const amount = (allocation / 100) * state.totalBudget;
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// Calculate trend info for tooltip
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const firstVal = historyData[0] ?? 0;
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const lastVal = historyData[historyData.length - 1] ?? 0;
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const trendDiff = lastVal - firstVal;
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const trendArrow =
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Math.abs(trendDiff) < 0.5 ? "" : trendDiff > 0 ? " +" : " ";
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const tooltipText = `Past allocations: ${firstVal.toFixed(0)}%${trendArrow}${trendDiff.toFixed(1)}%`;
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const row = document.createElement("div");
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row.className = "slider-row";
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row.dataset.categoryId = category.id;
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row.innerHTML = `
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<label class="slider-label" style="--category-color: ${category.color}">
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<span class="color-dot"></span>
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<span class="label-text">${category.name}</span>
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</label>
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<div class="sparkline-wrapper">
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<canvas class="sparkline" width="50" height="28"></canvas>
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<span class="sparkline-tooltip">${tooltipText}</span>
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</div>
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<div class="slider-container">
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<input
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type="range"
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class="slider"
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min="0"
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max="100"
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step="1"
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value="${allocation}"
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/>
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</div>
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<span class="slider-value">
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<span class="percent">${allocation.toFixed(1)}%</span>
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<span class="amount">${formatCurrency(amount)}</span>
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</span>
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<span class="percentile-badge"></span>
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`;
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// Draw sparkline
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const sparklineCanvas = row.querySelector(".sparkline") as HTMLCanvasElement;
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drawSparkline(sparklineCanvas, historyData, category.color);
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// Slider event listener
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const slider = row.querySelector(".slider") as HTMLInputElement;
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slider.addEventListener("input", () => {
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handleSliderChange(category.id, parseFloat(slider.value));
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});
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return row;
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}
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function handleSliderChange(categoryId: string, newPercent: number): void {
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state.allocations.set(categoryId, newPercent);
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updateSliderDisplay(categoryId, newPercent);
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updateChart();
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updateStatusBar();
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updatePercentileBadge(categoryId);
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updateComparisonSummary();
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}
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function updateSliderDisplay(categoryId: string, percent: number): void {
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const row = document.querySelector(
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`.slider-row[data-category-id="${categoryId}"]`,
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);
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if (!row) return;
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const amount = (percent / 100) * state.totalBudget;
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const percentEl = row.querySelector(".percent")!;
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const amountEl = row.querySelector(".amount")!;
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percentEl.textContent = `${percent.toFixed(1)}%`;
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amountEl.textContent = formatCurrency(amount);
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}
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function updateAllSliderAmounts(): void {
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if (!state.config) return;
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for (const category of state.config.categories) {
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const percent = state.allocations.get(category.id) ?? 0;
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updateSliderDisplay(category.id, percent);
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}
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}
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function focusSlider(categoryId: string): void {
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const slider = document.querySelector(
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`.slider-row[data-category-id="${categoryId}"] .slider`,
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) as HTMLInputElement | null;
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if (slider) {
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slider.focus();
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highlightSlider(categoryId);
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}
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}
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function highlightSlider(categoryId: string): void {
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clearSliderHighlight();
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const row = document.querySelector(
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`.slider-row[data-category-id="${categoryId}"]`,
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);
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if (row) {
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row.classList.add("highlighted");
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}
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}
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function clearSliderHighlight(): void {
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document
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.querySelectorAll(".slider-row.highlighted")
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.forEach((el) => el.classList.remove("highlighted"));
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}
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// ---------------------------------------------------------------------------
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// Percentile Badge Updates
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// ---------------------------------------------------------------------------
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function updatePercentileBadge(categoryId: string): void {
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if (!state.analytics || !state.config) return;
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const stageBenchmark = state.analytics.benchmarks.find(
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(b) => b.stage === state.selectedStage,
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);
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if (!stageBenchmark) return;
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const category = state.config.categories.find((c) => c.id === categoryId);
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if (!category) return;
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const currentAllocation =
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state.allocations.get(categoryId) ?? category.defaultPercent;
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const benchmarks = stageBenchmark.categoryBenchmarks[categoryId];
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if (!benchmarks) return;
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const badge = document.querySelector(
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`.slider-row[data-category-id="${categoryId}"] .percentile-badge`,
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);
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if (!badge) return;
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const percentile = calculatePercentile(currentAllocation, benchmarks);
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badge.className = `percentile-badge ${getPercentileClass(percentile)}`;
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badge.innerHTML = `<span class="percentile-icon">${getPercentileIcon(percentile)}</span>${formatPercentileBadge(percentile)}`;
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}
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function updateAllPercentileBadges(): void {
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if (!state.config) return;
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for (const category of state.config.categories) {
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updatePercentileBadge(category.id);
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}
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}
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// ---------------------------------------------------------------------------
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// Status Bar
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// ---------------------------------------------------------------------------
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function updateStatusBar(): void {
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const total = Array.from(state.allocations.values()).reduce(
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(sum, v) => sum + v,
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0,
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);
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const allocated = (total / 100) * state.totalBudget;
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const isBalanced = Math.abs(total - 100) < 0.1;
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let statusIcon: string;
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let statusClass: string;
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if (isBalanced) {
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statusIcon = "";
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statusClass = "status-balanced";
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} else if (total > 100) {
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statusIcon = " Over";
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statusClass = "status-warning status-over";
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} else {
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statusIcon = " Under";
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statusClass = "status-warning status-under";
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}
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statusBar.innerHTML = `
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Allocated: ${formatCurrencyFull(allocated)} / ${formatCurrencyFull(state.totalBudget)}
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<span class="status-icon">${statusIcon}</span>
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`;
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statusBar.className = `status-bar ${statusClass}`;
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}
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// ---------------------------------------------------------------------------
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// Comparison Summary
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// ---------------------------------------------------------------------------
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function updateComparisonSummary(): void {
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if (!state.analytics || !state.config) return;
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const stageBenchmark = state.analytics.benchmarks.find(
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(b) => b.stage === state.selectedStage,
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);
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if (!stageBenchmark) return;
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// Find most notable deviation
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let maxDeviation = 0;
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let maxDeviationCategory: BudgetCategory | null = null;
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let maxDeviationDirection = "";
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for (const category of state.config.categories) {
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const allocation =
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state.allocations.get(category.id) ?? category.defaultPercent;
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const benchmark = stageBenchmark.categoryBenchmarks[category.id];
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if (!benchmark) continue;
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const deviation = allocation - benchmark.p50;
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if (Math.abs(deviation) > Math.abs(maxDeviation)) {
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maxDeviation = deviation;
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maxDeviationCategory = category;
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maxDeviationDirection = deviation > 0 ? "above" : "below";
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}
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}
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if (maxDeviationCategory && Math.abs(maxDeviation) > 3) {
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comparisonSummary.innerHTML = `
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vs. Industry: <span class="comparison-highlight">${maxDeviationCategory.name}</span>
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||||
${maxDeviation > 0 ? "" : ""} ${Math.abs(Math.round(maxDeviation))}% ${maxDeviationDirection} avg
|
||||
`;
|
||||
} else {
|
||||
comparisonSummary.textContent = "vs. Industry: similar to peers";
|
||||
}
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Selector Initialization
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
function initBudgetSelector(presets: number[], defaultBudget: number): void {
|
||||
budgetSelector.innerHTML = "";
|
||||
|
||||
for (const amount of presets) {
|
||||
const option = document.createElement("option");
|
||||
option.value = amount.toString();
|
||||
option.textContent = formatCurrencyFull(amount);
|
||||
option.selected = amount === defaultBudget;
|
||||
budgetSelector.appendChild(option);
|
||||
}
|
||||
|
||||
budgetSelector.addEventListener("change", () => {
|
||||
state.totalBudget = parseInt(budgetSelector.value);
|
||||
updateAllSliderAmounts();
|
||||
updateStatusBar();
|
||||
});
|
||||
}
|
||||
|
||||
function initStageSelector(stages: string[], defaultStage: string): void {
|
||||
stageSelector.innerHTML = "";
|
||||
|
||||
for (const stage of stages) {
|
||||
const option = document.createElement("option");
|
||||
option.value = stage;
|
||||
option.textContent = stage;
|
||||
option.selected = stage === defaultStage;
|
||||
stageSelector.appendChild(option);
|
||||
}
|
||||
|
||||
stageSelector.addEventListener("change", () => {
|
||||
state.selectedStage = stageSelector.value;
|
||||
updateAllPercentileBadges();
|
||||
updateComparisonSummary();
|
||||
});
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Main Initialization
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
function initializeUI(config: BudgetConfig, analytics: BudgetAnalytics): void {
|
||||
state.config = config;
|
||||
state.analytics = analytics;
|
||||
state.totalBudget = config.defaultBudget;
|
||||
state.selectedStage = analytics.defaultStage;
|
||||
|
||||
// Initialize allocations with defaults
|
||||
for (const category of config.categories) {
|
||||
state.allocations.set(category.id, category.defaultPercent);
|
||||
}
|
||||
|
||||
// Initialize selectors
|
||||
initBudgetSelector(config.presetBudgets, config.defaultBudget);
|
||||
initStageSelector(analytics.stages, analytics.defaultStage);
|
||||
|
||||
// Create slider rows
|
||||
slidersContainer.innerHTML = "";
|
||||
for (const category of config.categories) {
|
||||
const historyData = analytics.history.map(
|
||||
(h) => h.allocations[category.id] ?? 0,
|
||||
);
|
||||
const row = createSliderRow(category, historyData);
|
||||
slidersContainer.appendChild(row);
|
||||
}
|
||||
|
||||
// Initialize chart
|
||||
state.chart = initChart(config.categories);
|
||||
|
||||
// Update all displays
|
||||
updateAllPercentileBadges();
|
||||
updateStatusBar();
|
||||
updateComparisonSummary();
|
||||
|
||||
log.info(
|
||||
"UI initialized with",
|
||||
analytics.history.length,
|
||||
"months of history",
|
||||
);
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// App Connection
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
const app = new App({ name: "Budget Allocator", version: "1.0.0" });
|
||||
|
||||
app.ontoolresult = (result) => {
|
||||
log.info("Received tool result:", result);
|
||||
const data = result.structuredContent as unknown as BudgetDataResponse;
|
||||
if (data?.config && data?.analytics) {
|
||||
initializeUI(data.config, data.analytics);
|
||||
}
|
||||
};
|
||||
|
||||
app.onerror = log.error;
|
||||
|
||||
// Handle theme changes
|
||||
window
|
||||
.matchMedia("(prefers-color-scheme: dark)")
|
||||
.addEventListener("change", () => {
|
||||
if (state.chart && state.config) {
|
||||
state.chart.destroy();
|
||||
state.chart = initChart(state.config.categories);
|
||||
}
|
||||
});
|
||||
|
||||
// Connect to host
|
||||
app.connect(new PostMessageTransport(window.parent));
|
||||
Loading…
Reference in a new issue