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cashFlow.mjs
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cashFlow.mjs
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import ynab from "ynab";
import dotenv from "dotenv";
import { formatYNAB, TRANSACTION_AMOUNT_DIVISOR } from "./helpers.js";
dotenv.config();
// Constants
const apiKey = process.env.YNAB_API_KEY;
const ynabAPI = new ynab.API(apiKey);
const targetAverageDailyBalance = 11000.0;
// Fetch all budgets and return an array of budget ids and names
const getAllBudgets = async () => {
try {
const {
data: { budgets },
} = await ynabAPI.budgets.getBudgets();
const budgetIdAndNameArray = budgets.map((budget) => ({
id: budget.id,
name: budget.name,
}));
return budgetIdAndNameArray;
} catch (error) {
console.error("Error fetching budgets:", error);
return [];
}
};
// Fetch category, account and transaction data for a given budget_id
const fetchData = async (budget_id) => {
try {
const [monthResp, accountsResp, txResp] = await Promise.all([
ynabAPI.months.getBudgetMonth(budget_id, "2023-01-01"),
ynabAPI.accounts.getAccounts(budget_id),
ynabAPI.transactions.getTransactions(budget_id),
]);
const categoriesData = monthResp.data.month.categories;
const accountsData = accountsResp.data.accounts;
const txData = txResp.data.transactions;
return { categoriesData, accountsData, txData };
} catch (error) {
console.error("An error occurred:", error);
return {};
}
};
// Join category, account and transaction data
const joinAccountForCategory = (categoriesData, accountsData, txData) => {
return categoriesData.map((category) => {
const txForCategory = txData.filter((tx) => tx.category_id === category.id);
const lastTx = txForCategory[txForCategory.length - 1];
if (lastTx) {
const account_type = accountsData.find(
(account) => account.id === lastTx.account_id
);
category["account_type"] = account_type.type;
} else {
category["account_type"] = null;
}
return category;
});
};
// Process the data by fetching and joining it
const processData = async (budget_id) => {
const { categoriesData, accountsData, txData } = await fetchData(budget_id);
const accountForCategory = joinAccountForCategory(
categoriesData,
accountsData,
txData
);
return { accountForCategory, txData, accountsData };
};
// Display the processed data
const displayData = ({
accountForCategory,
txData,
accountsData,
targetAverageDailyBalance,
}) => {
// ----------------------monthly repeating categories -------------------
const monthlyRepeatingCategories = accountForCategory.filter((category) => {
if (!category) {
return false;
}
const repeating = /\([0-9]/.test(category.name);
const include = repeating && !category.hidden;
return include;
});
const repeatingCashFlow = monthlyRepeatingCategories.reduce(
(memo, month) => memo + month.goal_target,
0
);
console.log("Repeating Cash Flows, cash and credit");
console.log(formatYNAB(repeatingCashFlow));
// ----------------------iterate months -------------------
// Generate an array of integers from 0 to 11 representing months
const monthKeys = [...Array(12).keys()];
// Iterate through monthKeys and create a new array with month data
//convert to arrow format
const filterCashAndCheckingAccounts = (accountForCategory, fullMonth) =>
accountForCategory.filter((monthlyCategory) => {
if (!monthlyCategory || !monthlyCategory.goal_target_month) {
return false;
}
const categoryMonth = new Date(
monthlyCategory.goal_target_month
).getMonth();
const currentYear = new Date().getFullYear();
const categoryYear = new Date(
monthlyCategory.goal_target_month
).getFullYear();
const fullMonthJs = fullMonth;
return (
categoryMonth === fullMonthJs.getMonth() &&
!monthlyCategory.hidden &&
categoryYear <= currentYear &&
(monthlyCategory.account_type === "checking" ||
monthlyCategory.account_type === "cash" ||
monthlyCategory.account_type === null)
);
});
const filterCreditAccounts = (accountForCategory, fullMonth) => {
return accountForCategory.filter((monthlyCategory) => {
if (!monthlyCategory || !monthlyCategory.goal_target_month) {
return false;
}
const categoryMonth = new Date(
monthlyCategory.goal_target_month
).getMonth();
const currentYear = new Date().getFullYear();
const categoryYear = new Date(
monthlyCategory.goal_target_month
).getFullYear();
const fullMonthJs = fullMonth;
const categoryDate = new Date(monthlyCategory.goal_target_month);
categoryDate.setMonth(categoryDate.getMonth() + 2);
return (
!monthlyCategory.hidden &&
categoryYear <= currentYear &&
categoryDate.getMonth() === fullMonthJs.getMonth() &&
monthlyCategory.account_type === "creditCard"
);
});
};
const calculateMonthCashFlow = (monthlySpecificPlusRepeating) =>
monthlySpecificPlusRepeating.reduce(
(memo, month) => (month ? memo + month.goal_target : memo),
0
);
//refactor into smaller functions
const getMonthsTarget = (
monthKeys,
accountForCategory,
monthlyRepeatingCategories
) => {
return monthKeys.map((monthKey) => {
const now = new Date();
const fullMonth = new Date(now.getFullYear(), monthKey, 1);
const monthCategorySummaryCash = filterCashAndCheckingAccounts(
accountForCategory,
fullMonth
);
const monthCategorySummaryCredit = filterCreditAccounts(
accountForCategory,
fullMonth
);
const monthlySpecificPlusRepeating = [
...monthlyRepeatingCategories,
...monthCategorySummaryCash,
...monthCategorySummaryCredit,
];
const monthCategorySummaryReduced = monthlySpecificPlusRepeating.map(
(month) => `${month.name}: ${formatYNAB(month.goal_target)}`
);
const monthCashFlow = calculateMonthCashFlow(
monthlySpecificPlusRepeating
);
const monthCashFlowFormatted = formatYNAB(monthCashFlow);
const specificMonthBalanceFormatted = formatYNAB(
monthCashFlow / 2 +
targetAverageDailyBalance * TRANSACTION_AMOUNT_DIVISOR
);
return {
month: monthKey + 1,
targetBalance: specificMonthBalanceFormatted,
cashFlowAmount: monthCashFlowFormatted,
thisMonth: monthCategorySummaryReduced,
};
});
};
// Get month target data and log it
const monthsTarget = getMonthsTarget(
monthKeys,
accountForCategory,
monthlyRepeatingCategories
);
console.log("\n\nMonth Specific Cash Flows:");
console.log(monthsTarget);
};
// Main function
const main = async () => {
const budgets = await getAllBudgets();
const budget_id = budgets[0].id; // main budget
const data = await processData(budget_id);
displayData({ ...data, targetAverageDailyBalance: 11000.0 });
};
// Run the main function and handle errors
main().catch((error) => {
console.error("Error:", error);
});