feat: edit mode + steal price entry

tests/helpers.test.js

@@ -0,0 +1,217 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+
+function monthToYear(month) {
+	const match = String(month || "").match(/(20\d{2})/);
+	return match ? Number(match[1]) : new Date().getFullYear();
+}
+
+function buildHistoryEntry(surcharges, baseSS) {
+	const month =
+		surcharges["316"]?.month ||
+		surcharges["304"]?.month ||
+		surcharges["444"]?.month ||
+		"";
+
+	return {
+		m: month,
+		y: monthToYear(month),
+		ss: Number.isFinite(Number(baseSS)) ? Number(baseSS) : null,
+		lz304: Number(surcharges["304"]?.value) || 0,
+		lz316: Number(surcharges["316"]?.value) || 0,
+		lz444: Number(surcharges["444"]?.value) || 0,
+	};
+}
+
+function getSaveMonth(surcharges, editMode, editMonth) {
+	if (editMode) return editMonth;
+
+	return (
+		surcharges["316"]?.month ||
+		surcharges["304"]?.month ||
+		surcharges["444"]?.month ||
+		""
+	);
+}
+
+function cloneSurcharges(surcharges) {
+	return {
+		304: {
+			...(surcharges["304"] || { month: "", value: 0 }),
+		},
+		316: {
+			...(surcharges["316"] || { month: "", value: 0 }),
+		},
+		444: {
+			...(surcharges["444"] || { month: "", value: 0 }),
+		},
+	};
+}
+
+function shouldUseEditedCurrentValues(editMode, editMonth, editSnapshot) {
+	if (!editMode || !editSnapshot) return true;
+
+	return getSaveMonth(editSnapshot.surcharges, false, "") === editMonth;
+}
+
+function buildSaveEntry(surcharges, baseSS, saveMonth) {
+	const entry = buildHistoryEntry(surcharges, baseSS);
+
+	return {
+		...entry,
+		m: saveMonth,
+		y: monthToYear(saveMonth),
+	};
+}
+
+function upsertHistory(history, entry) {
+	if (!entry.m) return history;
+
+	const existingIndex = history.findIndex(
+		(historyEntry) => historyEntry.m === entry.m,
+	);
+	if (existingIndex >= 0) {
+		const nextHistory = [...history];
+		nextHistory[existingIndex] = { ...nextHistory[existingIndex], ...entry };
+		return nextHistory;
+	}
+
+	return [...history, entry];
+}
+
+test("monthToYear extracts year", () => {
+	assert.equal(monthToYear("Apr. 2026"), 2026);
+	assert.equal(monthToYear("Jan 2025"), 2025);
+});
+
+test("buildSaveEntry persists base price and surcharge values", () => {
+	const surcharges = {
+		304: { month: "Apr. 2026", value: 2663 },
+		316: { month: "Apr. 2026", value: 4591 },
+		444: { month: "Apr. 2026", value: 2817 },
+	};
+
+	const entry = buildSaveEntry(surcharges, 813, "Apr. 2026");
+
+	assert.equal(entry.m, "Apr. 2026");
+	assert.equal(entry.y, 2026);
+	assert.equal(entry.ss, 813);
+	assert.equal(entry.lz304, 2663);
+	assert.equal(entry.lz316, 4591);
+	assert.equal(entry.lz444, 2817);
+});
+
+test("buildSaveEntry uses explicit save month", () => {
+	const surcharges = {
+		304: { month: "Apr. 2026", value: 2663 },
+		316: { month: "Apr. 2026", value: 4591 },
+		444: { month: "Apr. 2026", value: 2817 },
+	};
+
+	const entry = buildSaveEntry(surcharges, 755, "Feb 2026");
+
+	assert.equal(entry.m, "Feb 2026");
+	assert.equal(entry.y, 2026);
+	assert.equal(entry.ss, 755);
+	assert.equal(entry.lz316, 4591);
+});
+
+test("shouldUseEditedCurrentValues returns false for older month edit", () => {
+	const editSnapshot = {
+		baseSS: 813,
+		surcharges: cloneSurcharges({
+			304: { month: "Apr. 2026", value: 2663 },
+			316: { month: "Apr. 2026", value: 4591 },
+			444: { month: "Apr. 2026", value: 2817 },
+		}),
+	};
+
+	assert.equal(
+		shouldUseEditedCurrentValues(true, "Feb 2026", editSnapshot),
+		false,
+	);
+});
+
+test("shouldUseEditedCurrentValues returns true for current month edit", () => {
+	const editSnapshot = {
+		baseSS: 813,
+		surcharges: cloneSurcharges({
+			304: { month: "Apr. 2026", value: 2663 },
+			316: { month: "Apr. 2026", value: 4591 },
+			444: { month: "Apr. 2026", value: 2817 },
+		}),
+	};
+
+	assert.equal(
+		shouldUseEditedCurrentValues(true, "Apr. 2026", editSnapshot),
+		true,
+	);
+});
+
+test("shouldUseEditedCurrentValues returns true outside edit mode", () => {
+	const editSnapshot = {
+		baseSS: 813,
+		surcharges: cloneSurcharges({
+			304: { month: "Apr. 2026", value: 2663 },
+			316: { month: "Apr. 2026", value: 4591 },
+			444: { month: "Apr. 2026", value: 2817 },
+		}),
+	};
+
+	assert.equal(
+		shouldUseEditedCurrentValues(false, "Feb 2026", editSnapshot),
+		true,
+	);
+});
+
+test("upsertHistory appends entry for new month", () => {
+	const history = [
+		{ m: "Feb 2026", y: 2026, ss: 755, lz304: 2541, lz316: 4179, lz444: 2522 },
+		{ m: "Mrz 2026", y: 2026, ss: 792, lz304: 2571, lz316: 4367, lz444: 2637 },
+	];
+	const entry = {
+		m: "Apr 2026",
+		y: 2026,
+		ss: 813,
+		lz304: 2663,
+		lz316: 4591,
+		lz444: 2817,
+	};
+
+	const result = upsertHistory(history, entry);
+
+	assert.equal(result.length, 3);
+	assert.equal(result[2].m, "Apr 2026");
+});
+
+test("upsertHistory updates existing month without duplicate", () => {
+	const history = [
+		{ m: "Feb 2026", y: 2026, ss: 755, lz304: 2541, lz316: 4179, lz444: 2522 },
+		{ m: "Mrz 2026", y: 2026, ss: 792, lz304: 2571, lz316: 4367, lz444: 2637 },
+	];
+	const entry = {
+		m: "Mrz 2026",
+		ss: 800,
+		lz304: 2600,
+		lz316: 4400,
+		lz444: 2650,
+	};
+
+	const result = upsertHistory(history, entry);
+
+	assert.equal(result.length, 2);
+	assert.equal(result[1].m, "Mrz 2026");
+	assert.equal(result[1].y, 2026);
+	assert.equal(result[1].ss, 800);
+	assert.equal(result[1].lz444, 2650);
+});
+
+test("upsertHistory keeps history unchanged for missing month", () => {
+	const history = [
+		{ m: "Feb 2026", y: 2026, ss: 755, lz304: 2541, lz316: 4179, lz444: 2522 },
+	];
+
+	const result = upsertHistory(history, { m: "", ss: 700 });
+
+	assert.deepEqual(result, history);
+});