import { describe, expect, it } from "vitest";

import {
  SLEEP_CHOICES,
  SLEEP_OFF,
  armClockTime,
  armEndOfChapter,
  armMinutes,
  fadeVolume,
  formatRemaining,
  sleepChapterFired,
  sleepDue,
  sleepLabel,
  sleepRemainingMs,
} from "./audio-sleep";

describe("armMinutes / sleepDue / sleepRemainingMs", () => {
  it("arms a wall-clock deadline", () => {
    const state = armMinutes(1_000_000, 5);
    expect(state.mode).toBe("minutes");
    expect(state.endsAtMs).toBe(1_000_000 + 5 * 60_000);
    expect(sleepDue(state, 1_000_000 + 5 * 60_000 - 1)).toBe(false);
    expect(sleepDue(state, 1_000_000 + 5 * 60_000)).toBe(true);
    expect(sleepDue(state, 1_000_000 + 9 * 60_000)).toBe(true);
  });

  it("reports remaining time clamped at zero", () => {
    const state = armMinutes(0, 10);
    expect(sleepRemainingMs(state, 0)).toBe(600_000);
    expect(sleepRemainingMs(state, 599_000)).toBe(1000);
    expect(sleepRemainingMs(state, 700_000)).toBe(0);
  });

  it("never fires in non-minutes modes", () => {
    expect(sleepDue(SLEEP_OFF, Date.now())).toBe(false);
    expect(sleepDue(armEndOfChapter(3), Date.now())).toBe(false);
    expect(sleepRemainingMs(SLEEP_OFF, Date.now())).toBeNull();
  });
});

describe("armEndOfChapter / sleepChapterFired", () => {
  it("fires when the armed chapter is left, in either direction", () => {
    const state = armEndOfChapter(7);
    expect(sleepChapterFired(state, 7)).toBe(false);
    expect(sleepChapterFired(state, 8)).toBe(true);
    expect(sleepChapterFired(state, 6)).toBe(true);
  });

  it("does nothing in other modes", () => {
    expect(sleepChapterFired(SLEEP_OFF, 8)).toBe(false);
    expect(sleepChapterFired(armMinutes(0, 5), 8)).toBe(false);
  });
});

describe("fadeVolume", () => {
  it("holds the base at start, ramps linearly, reaches zero at fade end", () => {
    expect(fadeVolume(0.5, 0)).toBe(0.5);
    expect(fadeVolume(0.5, 2500)).toBeCloseTo(0.25, 10);
    expect(fadeVolume(0.5, 5000)).toBe(0);
    expect(fadeVolume(0.5, 9000)).toBe(0);
    expect(fadeVolume(1, 1000)).toBeCloseTo(0.8, 10);
  });

  it("clamps negative elapsed to the base and out-of-range volumes", () => {
    expect(fadeVolume(0.5, -5)).toBe(0.5);
    expect(fadeVolume(2, 1000)).toBeLessThanOrEqual(1);
  });
});

describe("formatRemaining / sleepLabel", () => {
  it("formats mm:ss, rounding up partial seconds", () => {
    expect(formatRemaining(45 * 60_000)).toBe("45:00");
    expect(formatRemaining(1000)).toBe("0:01");
    expect(formatRemaining(59_500)).toBe("1:00");
    expect(formatRemaining(0)).toBe("0:00");
  });

  it("labels every mode", () => {
    expect(sleepLabel(SLEEP_OFF, 0)).toBe("Off");
    expect(sleepLabel(armEndOfChapter(2), 0)).toBe("End of chapter");
    expect(
      sleepLabel({ mode: "fading", endsAtMs: null, chapterIndex: null, followUpMinutes: null }, 0),
    ).toBe("Fading");
    expect(sleepLabel(armMinutes(1000, 5), 1000 + 65_000)).toBe("3:55");
  });
});

describe("armClockTime (§17 stop-at-clock)", () => {
  it("arms a minutes-state deadline at the next occurrence of HH:MM", () => {
    // 10:00 local → 23:00 same day.
    const tenAm = new Date();
    tenAm.setHours(10, 0, 0, 0);
    const state = armClockTime(tenAm.getTime(), "23:00");
    expect(state?.mode).toBe("minutes");
    const expected = new Date(tenAm);
    expected.setHours(23, 0, 0, 0);
    expect(state?.endsAtMs).toBe(expected.getTime());
    // Label is the ordinary countdown machinery (12h59m → 779:00).
    expect(sleepLabel(state!, tenAm.getTime() + 60_000)).toBe("779:00");
  });

  it("wraps to tomorrow when the time already passed", () => {
    const noon = new Date();
    noon.setHours(12, 0, 0, 0);
    const state = armClockTime(noon.getTime(), "09:15");
    const expected = new Date(noon);
    expected.setDate(expected.getDate() + 1);
    expected.setHours(9, 15, 0, 0);
    expect(state?.endsAtMs).toBe(expected.getTime());
  });

  it("rejects unparseable and out-of-range input", () => {
    const now = Date.now();
    expect(armClockTime(now, "nope")).toBeNull();
    expect(armClockTime(now, "24:00")).toBeNull();
    expect(armClockTime(now, "10:61")).toBeNull();
  });
});

describe("§17 chain: end-of-chapter with a follow-up countdown", () => {
  it("arms the follow-up on the state; the chapter fire contract is unchanged", () => {
    const state = armEndOfChapter(2, 15);
    expect(state.followUpMinutes).toBe(15);
    // The sync contract (any chapter change fires) is the same — the
    // component converts to armMinutes instead of fading.
    expect(sleepChapterFired(state, 3)).toBe(true);
    expect(sleepChapterFired(state, 1)).toBe(true);
    expect(sleepChapterFired(state, 2)).toBe(false);
  });

  it("labels the chapter phase with the follow-up length", () => {
    expect(sleepLabel(armEndOfChapter(2, 15), 0)).toBe("Ch + 15m");
    expect(sleepLabel(armEndOfChapter(2), 0)).toBe("End of chapter");
  });

  it("offers the chain row in the dropdown vocabulary", () => {
    const chain = SLEEP_CHOICES.find((c) => c.key === "eoch15");
    expect(chain).toMatchObject({ mode: "end-of-chapter", minutes: 15, chain: true });
  });
});

describe("SLEEP_CHOICES", () => {
  it("is the agreed option list: off, 5/10/15/30/45/60, end-of-chapter, chain", () => {
    expect(SLEEP_CHOICES.map((c) => c.key)).toEqual([
      "off",
      "5",
      "10",
      "15",
      "30",
      "45",
      "60",
      "eoch",
      "eoch15",
    ]);
    expect(SLEEP_CHOICES.filter((c) => c.mode === "minutes").map((c) => c.minutes)).toEqual([
      5, 10, 15, 30, 45, 60,
    ]);
  });

  it("has unique keys and labels", () => {
    expect(new Set(SLEEP_CHOICES.map((c) => c.key)).size).toBe(SLEEP_CHOICES.length);
    expect(new Set(SLEEP_CHOICES.map((c) => c.label)).size).toBe(SLEEP_CHOICES.length);
  });
});