import { describe, expect, it } from "vitest";
import {
  DEFAULT_CLIP_S,
  MAX_CLIP_S,
  handleBounds,
  markIn,
  markOut,
  openAt,
  zoomWindow,
} from "./clipRange";

const D = 3600;

describe("clipRange", () => {
  it("opens a default-length range at the playhead, shorter at the item's end", () => {
    expect(openAt(100, D)).toEqual({ start: 100, end: 100 + DEFAULT_CLIP_S });
    expect(openAt(3590, D)).toEqual({ start: 3590, end: 3600 });
    expect(openAt(3600, D)).toEqual({ start: 3599, end: 3600 });
  });

  it("moves In alone while the range stays one the server takes", () => {
    expect(markIn({ start: 100, end: 130 }, 90, D)).toEqual({ start: 90, end: 130 });
  });

  it("carries Out along when In passes it, and keeps the cap when In goes too far back", () => {
    expect(markIn({ start: 100, end: 130 }, 200, D)).toEqual({ start: 200, end: 230 });
    expect(markIn({ start: 1000, end: 1030 }, 100, D)).toEqual({
      start: 100,
      end: 100 + MAX_CLIP_S,
    });
  });

  it("carries In along when Out goes before it or too far ahead", () => {
    expect(markOut({ start: 100, end: 130 }, 150, D)).toEqual({ start: 100, end: 150 });
    expect(markOut({ start: 100, end: 130 }, 50, D)).toEqual({ start: 20, end: 50 });
    expect(markOut({ start: 100, end: 130 }, 1000, D)).toEqual({ start: 400, end: 1000 });
  });

  it("every marked range is at least a second and at most the cap", () => {
    for (const [r, t] of [
      [{ start: 0, end: 30 }, 0],
      [{ start: 0, end: 30 }, 3600],
      [{ start: 3000, end: 3600 }, 0],
    ] as const) {
      for (const next of [markIn(r, t, D), markOut(r, t, D)]) {
        expect(next.end - next.start).toBeGreaterThanOrEqual(1);
        expect(next.end - next.start).toBeLessThanOrEqual(MAX_CLIP_S);
        expect(next.start).toBeGreaterThanOrEqual(0);
        expect(next.end).toBeLessThanOrEqual(D);
      }
    }
  });

  it("bounds each handle so a drag never breaks the range", () => {
    expect(handleBounds({ start: 100, end: 130 }, D)).toEqual({
      in: { min: 0, max: 129 },
      out: { min: 101, max: 700 },
    });
  });

  it("zooms to the range with room either side, inside the item", () => {
    expect(zoomWindow({ start: 100, end: 140 }, D)).toEqual({ from: 90, to: 150 });
    expect(zoomWindow({ start: 2, end: 10 }, D)).toEqual({ from: 0, to: 15 });
  });
});