import getSlots from "@lib/slots";
import { expect, it } from "@jest/globals";
import MockDate from "mockdate";
import dayjs from "dayjs";
import utc from "dayjs/plugin/utc";
import timezone from "dayjs/plugin/timezone";

dayjs.extend(utc);
dayjs.extend(timezone);

MockDate.set("2021-06-20T11:59:59Z");

it("can fit 24 hourly slots for an empty day", async () => {
  // 24h in a day.
  expect(
    getSlots({
      inviteeDate: dayjs().add(1, "day"),
      frequency: 60,
      workingHours: [{ days: [...Array(7).keys()], startTime: 0, endTime: 1440 }],
      organizerTimeZone: "Europe/London",
    })
  ).toHaveLength(24);
});

it("only shows future booking slots on the same day", async () => {
  // The mock date is 1s to midday, so 12 slots should be open given 0 booking notice.
  expect(
    getSlots({
      inviteeDate: dayjs(),
      frequency: 60,
      workingHours: [{ days: [...Array(7).keys()], startTime: 0, endTime: 1440 }],
      organizerTimeZone: "GMT",
    })
  ).toHaveLength(12);
});

it("can cut off dates that due to invitee timezone differences fall on the next day", async () => {
  expect(
    getSlots({
      inviteeDate: dayjs().tz("Europe/Amsterdam").startOf("day"), // time translation +01:00
      frequency: 60,
      workingHours: [{ days: [0], startTime: 1380, endTime: 1440 }],
      organizerTimeZone: "Europe/London",
    })
  ).toHaveLength(0);
});

it("can cut off dates that due to invitee timezone differences fall on the previous day", async () => {
  expect(
    getSlots({
      inviteeDate: dayjs().startOf("day"), // time translation -01:00
      frequency: 60,
      workingHours: [{ days: [0], startTime: 0, endTime: 60 }],
      organizerTimeZone: "Europe/London",
    })
  ).toHaveLength(0);
});