feat: creates backend for the project
This commit is contained in:
vakabunga
196
backend/src/services/analytics.ts
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196
backend/src/services/analytics.ts
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import { pool } from '../db/pool';
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import type {
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AnalyticsSummaryResponse,
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TopCategory,
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ByCategoryItem,
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TimeseriesItem,
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Granularity,
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} from '@family-budget/shared';
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interface BaseParams {
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from: string;
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to: string;
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accountId?: number;
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onlyConfirmed?: boolean;
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}
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function buildBaseConditions(
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params: BaseParams,
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startIdx: number,
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): { conditions: string[]; values: unknown[]; nextIdx: number } {
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const conditions: string[] = [];
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const values: unknown[] = [];
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let idx = startIdx;
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conditions.push(`t.operation_at >= $${idx}::date`);
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values.push(params.from);
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idx++;
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conditions.push(`t.operation_at < ($${idx}::date + 1)`);
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values.push(params.to);
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idx++;
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if (params.accountId != null) {
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conditions.push(`t.account_id = $${idx}`);
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values.push(params.accountId);
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idx++;
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}
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if (params.onlyConfirmed) {
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conditions.push('t.is_category_confirmed = TRUE');
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}
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return { conditions, values, nextIdx: idx };
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}
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export async function getSummary(params: BaseParams): Promise<AnalyticsSummaryResponse> {
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const { conditions, values } = buildBaseConditions(params, 1);
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const where = 'WHERE ' + conditions.join(' AND ');
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const totalsResult = await pool.query(
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`SELECT
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COALESCE(SUM(CASE WHEN t.direction = 'expense' THEN ABS(t.amount_signed) ELSE 0 END), 0)::bigint AS total_expense,
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COALESCE(SUM(CASE WHEN t.direction = 'income' THEN t.amount_signed ELSE 0 END), 0)::bigint AS total_income
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FROM transactions t
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${where}`,
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values,
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);
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const totalExpense = Number(totalsResult.rows[0].total_expense);
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const totalIncome = Number(totalsResult.rows[0].total_income);
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const topResult = await pool.query(
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`SELECT
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t.category_id,
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c.name AS category_name,
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SUM(ABS(t.amount_signed))::bigint AS amount
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FROM transactions t
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LEFT JOIN categories c ON c.id = t.category_id
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${where} AND t.direction = 'expense' AND t.category_id IS NOT NULL
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GROUP BY t.category_id, c.name
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ORDER BY amount DESC
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LIMIT 5`,
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values,
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);
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const topCategories: TopCategory[] = topResult.rows.map((r) => ({
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categoryId: Number(r.category_id),
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categoryName: r.category_name,
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amount: Number(r.amount),
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share: totalExpense > 0 ? Number(r.amount) / totalExpense : 0,
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}));
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return {
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totalExpense,
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totalIncome,
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net: totalIncome - totalExpense,
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topCategories,
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};
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}
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export async function getByCategory(params: BaseParams): Promise<ByCategoryItem[]> {
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const { conditions, values } = buildBaseConditions(params, 1);
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const where = 'WHERE ' + conditions.join(' AND ');
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const totalResult = await pool.query(
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`SELECT COALESCE(SUM(ABS(t.amount_signed)), 0)::bigint AS total
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FROM transactions t
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${where} AND t.direction = 'expense'`,
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values,
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);
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const total = Number(totalResult.rows[0].total);
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const { rows } = await pool.query(
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`SELECT
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t.category_id,
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c.name AS category_name,
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SUM(ABS(t.amount_signed))::bigint AS amount,
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COUNT(*)::int AS tx_count
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FROM transactions t
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LEFT JOIN categories c ON c.id = t.category_id
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${where} AND t.direction = 'expense'
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GROUP BY t.category_id, c.name
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ORDER BY amount DESC`,
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values,
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);
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return rows.map((r) => ({
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categoryId: r.category_id != null ? Number(r.category_id) : 0,
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categoryName: r.category_name ?? 'Без категории',
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amount: Number(r.amount),
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txCount: r.tx_count,
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share: total > 0 ? Number(r.amount) / total : 0,
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}));
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}
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export async function getTimeseries(
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params: BaseParams & { categoryId?: number; granularity: Granularity },
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): Promise<TimeseriesItem[]> {
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let truncExpr: string;
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let intervalStr: string;
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let periodEndExpr: string;
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switch (params.granularity) {
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case 'day':
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truncExpr = `$1::date`;
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intervalStr = '1 day';
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periodEndExpr = 'gs::date';
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break;
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case 'week':
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truncExpr = `date_trunc('week', $1::date)::date`;
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intervalStr = '1 week';
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periodEndExpr = "(gs + interval '6 days')::date";
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break;
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case 'month':
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truncExpr = `date_trunc('month', $1::date)::date`;
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intervalStr = '1 month';
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periodEndExpr = "(gs + interval '1 month' - interval '1 day')::date";
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break;
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}
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const txConditions: string[] = [
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't.operation_at::date >= p.period_start',
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't.operation_at::date <= p.period_end',
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];
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const values: unknown[] = [params.from, params.to];
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let idx = 3;
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if (params.accountId != null) {
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txConditions.push(`t.account_id = $${idx++}`);
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values.push(params.accountId);
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}
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if (params.categoryId != null) {
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txConditions.push(`t.category_id = $${idx++}`);
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values.push(params.categoryId);
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}
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if (params.onlyConfirmed) {
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txConditions.push('t.is_category_confirmed = TRUE');
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}
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const txWhere = txConditions.join(' AND ');
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const { rows } = await pool.query(
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`WITH periods AS (
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SELECT
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gs::date AS period_start,
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${periodEndExpr} AS period_end
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FROM generate_series(${truncExpr}, $2::date, '${intervalStr}'::interval) gs
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)
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SELECT
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p.period_start,
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p.period_end,
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COALESCE(SUM(CASE WHEN t.direction = 'expense' THEN ABS(t.amount_signed) ELSE 0 END), 0)::bigint AS expense_amount,
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COALESCE(SUM(CASE WHEN t.direction = 'income' THEN t.amount_signed ELSE 0 END), 0)::bigint AS income_amount
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FROM periods p
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LEFT JOIN transactions t ON ${txWhere}
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GROUP BY p.period_start, p.period_end
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ORDER BY p.period_start`,
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values,
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);
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return rows.map((r) => ({
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periodStart: r.period_start.toISOString().slice(0, 10),
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periodEnd: r.period_end.toISOString().slice(0, 10),
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expenseAmount: Number(r.expense_amount),
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incomeAmount: Number(r.income_amount),
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}));
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}
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