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import { describe, expect, it } from "vitest";
import { generateCardsForNote, renderCardTemplate } from "./card-generator";
describe("renderCardTemplate", () => {
it("substitutes a single placeholder", () => {
const fields = new Map([["Front", "Hello"]]);
expect(renderCardTemplate("{{Front}}", fields)).toBe("Hello");
});
it("substitutes multiple placeholders", () => {
const fields = new Map([
["Front", "Q"],
["Back", "A"],
]);
expect(renderCardTemplate("{{Front}} -> {{Back}}", fields)).toBe("Q -> A");
});
it("substitutes the same placeholder repeated in a template", () => {
const fields = new Map([["Word", "x"]]);
expect(renderCardTemplate("{{Word}}{{Word}}", fields)).toBe("xx");
});
it("leaves unknown placeholders unchanged", () => {
const fields = new Map([["Front", "Q"]]);
expect(renderCardTemplate("{{Front}} {{Missing}}", fields)).toBe(
"Q {{Missing}}",
);
});
it("replaces placeholders with empty strings when value is empty", () => {
const fields = new Map([["Front", ""]]);
expect(renderCardTemplate("[{{Front}}]", fields)).toBe("[]");
});
});
const noteTypeBase = {
frontTemplate: "{{Front}}",
backTemplate: "{{Back}}",
isReversible: false,
};
const fieldTypes = [
{ id: "ft-front", name: "Front" },
{ id: "ft-back", name: "Back" },
];
const fieldValues = [
{ noteFieldTypeId: "ft-front", value: "Question" },
{ noteFieldTypeId: "ft-back", value: "Answer" },
];
describe("generateCardsForNote", () => {
it("returns one card when isReversible is false", () => {
const cards = generateCardsForNote({
noteType: noteTypeBase,
fieldTypes,
fieldValues,
});
expect(cards).toHaveLength(1);
expect(cards[0]).toMatchObject({
isReversed: false,
front: "Question",
back: "Answer",
});
});
it("returns two cards when isReversible is true and swaps templates", () => {
const cards = generateCardsForNote({
noteType: { ...noteTypeBase, isReversible: true },
fieldTypes,
fieldValues,
});
expect(cards).toHaveLength(2);
expect(cards[0]).toMatchObject({
isReversed: false,
front: "Question",
back: "Answer",
});
expect(cards[1]).toMatchObject({
isReversed: true,
front: "Answer",
back: "Question",
});
});
it("initialises FSRS state to a fresh new-card payload", () => {
const now = new Date("2026-05-02T10:00:00Z");
const [card] = generateCardsForNote({
noteType: noteTypeBase,
fieldTypes,
fieldValues,
now,
});
expect(card).toMatchObject({
state: 0,
stability: 0,
difficulty: 0,
elapsedDays: 0,
scheduledDays: 0,
reps: 0,
lapses: 0,
});
expect(card?.due.getTime()).toBe(now.getTime());
});
it("treats missing field values as empty strings", () => {
const [card] = generateCardsForNote({
noteType: noteTypeBase,
fieldTypes,
fieldValues: [{ noteFieldTypeId: "ft-front", value: "Q only" }],
});
expect(card?.front).toBe("Q only");
expect(card?.back).toBe("{{Back}}");
});
it("ignores field values with unknown field type ids", () => {
const [card] = generateCardsForNote({
noteType: noteTypeBase,
fieldTypes,
fieldValues: [
...fieldValues,
{ noteFieldTypeId: "ft-unknown", value: "ghost" },
],
});
expect(card?.front).toBe("Question");
expect(card?.back).toBe("Answer");
});
it("returns independent due Date instances per card", () => {
const now = new Date("2026-05-02T10:00:00Z");
const cards = generateCardsForNote({
noteType: { ...noteTypeBase, isReversible: true },
fieldTypes,
fieldValues,
now,
});
expect(cards[0]?.due).not.toBe(cards[1]?.due);
expect(cards[0]?.due).not.toBe(now);
});
});
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