554 lines
19 KiB
TypeScript
554 lines
19 KiB
TypeScript
"use client";
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import * as React from "react";
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import { useState } from "react";
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import { zodResolver } from "@hookform/resolvers/zod";
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import { useForm } from "react-hook-form";
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import * as z from "zod";
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import { Button } from "@/components/ui/button";
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import { Input } from "@/components/ui/input";
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import {
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Form,
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FormControl,
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FormField,
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FormItem,
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FormLabel,
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FormMessage,
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} from "@/components/ui/form";
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import {
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Card,
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CardContent,
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CardDescription,
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CardHeader,
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CardTitle,
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} from "@/components/ui/card";
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import { ChartContainer, ChartTooltip } from "@/components/ui/chart";
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import {
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Area,
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AreaChart,
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CartesianGrid,
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XAxis,
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YAxis,
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ReferenceLine,
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} from "recharts";
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import { Slider } from "@/components/ui/slider";
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import assert from "assert";
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// Schema for form validation
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const formSchema = z.object({
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startingCapital: z.coerce.number(),
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monthlySavings: z.coerce
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.number()
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.min(0, "Monthly savings must be a non-negative number"),
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currentAge: z.coerce
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.number()
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.min(1, "Age must be at least 1")
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.max(100, "No point in starting this late"),
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cagr: z.coerce.number().min(0, "Growth rate must be a non-negative number"),
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desiredMonthlyAllowance: z.coerce
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.number()
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.min(0, "Monthly allowance must be a non-negative number"),
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inflationRate: z.coerce
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.number()
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.min(0, "Inflation rate must be a non-negative number"),
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lifeExpectancy: z.coerce
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.number()
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.min(40, "Be a bit more optimistic buddy :(")
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.max(100, "You should be more realistic..."),
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retirementAge: z.coerce
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.number()
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.min(18, "Retirement age must be at least 18")
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.max(100, "Retirement age must be at most 100"),
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});
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// Type for form values
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type FormValues = z.infer<typeof formSchema>;
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interface YearlyData {
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age: number;
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year: number;
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balance: number;
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phase: "accumulation" | "retirement";
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monthlyAllowance: number;
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}
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interface CalculationResult {
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fireNumber: number | null;
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yearlyData: YearlyData[];
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error?: string;
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}
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export default function FireCalculatorForm() {
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const [result, setResult] = useState<CalculationResult | null>(null);
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const irlYear = new Date().getFullYear();
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// Initialize form with default values
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const form = useForm<FormValues>({
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resolver: zodResolver(formSchema),
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defaultValues: {
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startingCapital: 50000,
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monthlySavings: 1500,
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currentAge: 25,
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cagr: 7,
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desiredMonthlyAllowance: 3000,
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inflationRate: 2,
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lifeExpectancy: 84,
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retirementAge: 55,
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},
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});
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function onSubmit(values: FormValues) {
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setResult(null); // Reset previous results
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const startingCapital = values.startingCapital;
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const monthlySavings = values.monthlySavings;
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const age = values.currentAge;
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const annualGrowthRate = 1 + values.cagr / 100;
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const initialMonthlyAllowance = values.desiredMonthlyAllowance;
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const annualInflation = 1 + values.inflationRate / 100;
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const ageOfDeath = values.lifeExpectancy;
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const retirementAge = values.retirementAge;
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// Array to store yearly data for the chart
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const yearlyData: YearlyData[] = [];
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// Initial year data
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yearlyData.push({
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age: age,
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year: irlYear,
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balance: startingCapital,
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phase: "accumulation",
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monthlyAllowance: initialMonthlyAllowance,
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});
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// Calculate accumulation phase (before retirement)
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for (let year = irlYear + 1; year <= irlYear + (ageOfDeath - age); year++) {
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const currentAge = age + (year - irlYear);
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const previousYearData = yearlyData[yearlyData.length - 1];
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const inflatedAllowance =
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initialMonthlyAllowance * Math.pow(annualInflation, year - irlYear);
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const isRetirementYear = currentAge >= retirementAge;
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const phase = isRetirementYear ? "retirement" : "accumulation";
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assert(!!previousYearData);
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// Calculate balance based on phase
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let newBalance;
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if (phase === "accumulation") {
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// During accumulation: grow previous balance + add savings
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newBalance =
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previousYearData.balance * annualGrowthRate + monthlySavings * 12;
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} else {
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// During retirement: grow previous balance - withdraw allowance
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newBalance =
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previousYearData.balance * annualGrowthRate - inflatedAllowance * 12;
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}
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yearlyData.push({
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age: currentAge,
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year: year,
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balance: newBalance,
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phase: phase,
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monthlyAllowance: inflatedAllowance,
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});
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}
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// Calculate FIRE number at retirement
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const retirementYear = irlYear + (retirementAge - age);
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const retirementIndex = yearlyData.findIndex(
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(data) => data.year === retirementYear,
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);
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const retirementData = yearlyData[retirementIndex];
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if (retirementIndex === -1 || !retirementData) {
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setResult({
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fireNumber: null,
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error: "Could not calculate retirement data",
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yearlyData: yearlyData,
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});
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} else {
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// Set the result
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setResult({
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fireNumber: retirementData.balance,
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yearlyData: yearlyData,
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});
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}
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}
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// Helper function to format currency without specific symbols
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const formatNumber = (value: number | null) => {
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if (value === null) return "N/A";
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return new Intl.NumberFormat("en", {
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maximumFractionDigits: 0,
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}).format(value);
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};
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return (
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<>
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<Card className="mb-4">
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<CardHeader>
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<CardTitle className="text-2xl">FIRE Calculator</CardTitle>
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<CardDescription>
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Calculate your path to financial independence and retirement
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</CardDescription>
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</CardHeader>
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<CardContent>
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<Form {...form}>
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<form onSubmit={form.handleSubmit(onSubmit)} className="space-y-8">
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<div className="grid grid-cols-1 gap-6 md:grid-cols-2">
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<FormField
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control={form.control}
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name="startingCapital"
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render={({ field }) => (
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<FormItem>
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<FormLabel>Starting Capital</FormLabel>
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<FormControl>
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<Input
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placeholder="e.g., 10000"
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type="number"
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{...field}
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/>
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</FormControl>
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<FormMessage />
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</FormItem>
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)}
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/>
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<FormField
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control={form.control}
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name="monthlySavings"
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render={({ field }) => (
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<FormItem>
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<FormLabel>Monthly Savings</FormLabel>
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<FormControl>
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<Input
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placeholder="e.g., 500"
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type="number"
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{...field}
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/>
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</FormControl>
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<FormMessage />
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</FormItem>
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)}
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/>
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<FormField
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control={form.control}
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name="currentAge"
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render={({ field }) => (
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<FormItem>
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<FormLabel>Current Age</FormLabel>
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<FormControl>
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<Input
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placeholder="e.g., 30"
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type="number"
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{...field}
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/>
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</FormControl>
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<FormMessage />
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</FormItem>
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)}
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/>
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<FormField
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control={form.control}
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name="lifeExpectancy"
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render={({ field }) => (
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<FormItem>
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<FormLabel>Life Expectancy (Age)</FormLabel>
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<FormControl>
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<Input
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placeholder="e.g., 90"
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type="number"
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{...field}
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/>
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</FormControl>
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<FormMessage />
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</FormItem>
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)}
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/>
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<FormField
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control={form.control}
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name="cagr"
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render={({ field }) => (
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<FormItem>
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<FormLabel>Expected Annual Growth Rate (%)</FormLabel>
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<FormControl>
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<Input
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placeholder="e.g., 7"
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type="number"
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step="0.1"
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{...field}
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/>
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</FormControl>
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<FormMessage />
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</FormItem>
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)}
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/>
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<FormField
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control={form.control}
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name="inflationRate"
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render={({ field }) => (
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<FormItem>
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<FormLabel>Annual Inflation Rate (%)</FormLabel>
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<FormControl>
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<Input
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placeholder="e.g., 2"
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type="number"
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step="0.1"
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{...field}
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/>
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</FormControl>
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<FormMessage />
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</FormItem>
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)}
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/>
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<FormField
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control={form.control}
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name="desiredMonthlyAllowance"
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render={({ field }) => (
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<FormItem>
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<FormLabel>
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Desired Monthly Allowance (Today's Value)
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</FormLabel>
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<FormControl>
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<Input
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placeholder="e.g., 2000"
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type="number"
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{...field}
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/>
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</FormControl>
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<FormMessage />
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</FormItem>
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)}
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/>
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{/* Retirement Age Slider */}
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<FormField
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control={form.control}
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name="retirementAge"
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render={({ field }) => (
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<FormItem>
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<FormLabel>Retirement Age: {field.value}</FormLabel>
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<FormControl>
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<Slider
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value={[field.value]}
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min={form.getValues().currentAge + 1}
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max={form.getValues().lifeExpectancy - 1}
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step={1}
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onValueChange={field.onChange}
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className="py-4"
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/>
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</FormControl>
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<FormMessage />
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</FormItem>
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)}
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/>
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<FormItem className="col-span-full"></FormItem>
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</div>
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<Button type="submit" className="w-full">
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Calculate
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</Button>
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{result?.yearlyData && (
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<Card className="rounded-md shadow-none">
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<CardHeader>
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<CardTitle>Financial Projection</CardTitle>
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<CardDescription>
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Projected balance growth with your selected retirement age
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</CardDescription>
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</CardHeader>
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<CardContent>
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<ChartContainer
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className="aspect-auto h-80 w-full"
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config={{
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balance: {
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label: "Balance",
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color: "var(--chart-1)",
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},
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realBalance: {
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label: "Real Balance",
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color: "var(--chart-3)",
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},
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}}
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>
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<AreaChart
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data={result.yearlyData}
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margin={{ top: 20, right: 30, left: 20, bottom: 20 }}
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>
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<CartesianGrid strokeDasharray="3 3" />
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<XAxis
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dataKey="year"
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label={{
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value: "Year",
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position: "insideBottom",
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offset: -10,
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}}
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/>
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<YAxis
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tickFormatter={(value: number) => {
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if (value >= 1000000) {
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return `${(value / 1000000).toPrecision(3)}M`;
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} else if (value >= 1000) {
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return `${(value / 1000).toPrecision(3)}K`;
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} else if (value <= -1000000) {
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return `${(value / 1000000).toPrecision(3)}M`;
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} else if (value <= -1000) {
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return `${(value / 1000).toPrecision(3)}K`;
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}
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return value.toString();
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}}
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width={25}
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/>
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<ChartTooltip
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content={({ active, payload }) => {
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if (active && payload?.[0]?.payload) {
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const data = payload[0]
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.payload as (typeof result.yearlyData)[0];
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return (
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<div className="bg-background border p-2 shadow-sm">
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<p className="font-medium">{`Year: ${data.year.toString()} (Age: ${data.age.toString()})`}</p>
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<p className="text-chart-1">{`Balance: ${formatNumber(data.balance)}`}</p>
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<p className="text-chart-2">{`Monthly allowance: ${formatNumber(data.monthlyAllowance)}`}</p>
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<p>{`Phase: ${data.phase === "accumulation" ? "Accumulation" : "Retirement"}`}</p>
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</div>
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);
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}
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return null;
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}}
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/>
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<defs>
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<linearGradient
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id="fillBalance"
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x1="0"
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y1="0"
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x2="0"
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y2="1"
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>
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<stop
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offset="5%"
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stopColor="var(--chart-1)"
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stopOpacity={0.8}
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/>
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<stop
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offset="95%"
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stopColor="var(--chart-1)"
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stopOpacity={0.1}
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/>
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</linearGradient>
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<linearGradient
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id="fillAllowance"
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x1="0"
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y1="0"
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x2="0"
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y2="1"
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>
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<stop
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offset="5%"
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stopColor="var(--chart-2)"
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stopOpacity={0.8}
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/>
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<stop
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offset="95%"
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stopColor="var(--chart-2)"
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stopOpacity={0.1}
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/>
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</linearGradient>
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</defs>
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<Area
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type="monotone"
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dataKey="balance"
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name="balance"
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stroke="var(--chart-1)"
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fill="url(#fillBalance)"
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fillOpacity={0.4}
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activeDot={{ r: 6 }}
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/>
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<Area
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type="monotone"
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dataKey="monthlyAllowance"
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name="allowance"
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stroke="var(--chart-2)"
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fill="url(#fillAllowance)"
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fillOpacity={0.4}
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activeDot={{ r: 6 }}
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/>
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{result.fireNumber && (
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<ReferenceLine
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y={result.fireNumber}
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stroke="var(--chart-3)"
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strokeWidth={1}
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strokeDasharray="2 2"
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label={{
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value: "FIRE Number",
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position: "insideBottomRight",
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}}
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/>
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)}
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<ReferenceLine
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x={
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irlYear +
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(form.getValues().retirementAge -
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form.getValues().currentAge)
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}
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stroke="var(--chart-2)"
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strokeWidth={2}
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label={{
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value: "Retirement",
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position: "insideTopRight",
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}}
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/>
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</AreaChart>
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</ChartContainer>
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</CardContent>
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</Card>
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)}
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</form>
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</Form>
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</CardContent>
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</Card>
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{result && (
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<div className="mb-4 grid grid-cols-1 gap-2 md:grid-cols-2">
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{result.error ? (
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<Card className="col-span-full">
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<CardContent className="pt-6">
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<p className="text-destructive">{result.error}</p>
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</CardContent>
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</Card>
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) : (
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<>
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<Card>
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<CardHeader>
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<CardTitle>FIRE Number</CardTitle>
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<CardDescription className="text-xs">
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Capital at retirement
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</CardDescription>
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</CardHeader>
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<CardContent>
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<p className="text-3xl font-bold">
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{formatNumber(result.fireNumber)}
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</p>
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</CardContent>
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</Card>
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<Card>
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<CardHeader>
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<CardTitle>Retirement Duration</CardTitle>
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<CardDescription className="text-xs">
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Years to enjoy your financial independence
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</CardDescription>
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</CardHeader>
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<CardContent>
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<p className="text-3xl font-bold">
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{form.getValues().lifeExpectancy -
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form.getValues().retirementAge}
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</p>
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</CardContent>
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</Card>
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</>
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)}
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</div>
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)}
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</>
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);
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}
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