import { describe, it, expect } from 'vitest';
import { computeQuickClipRange } from '$lib/utils/clipRange';

describe('computeQuickClipRange', () => {
  it('returns null when duration is 0', () => {
    expect(computeQuickClipRange(5, 0, 'at')).toBeNull();
  });

  it('"at" creates clip from currentTime to currentTime+10', () => {
    const result = computeQuickClipRange(30, 120, 'at');
    expect(result).toEqual({ start: 30, end: 40 });
  });

  it('"before" creates clip from currentTime-10 to currentTime', () => {
    const result = computeQuickClipRange(30, 120, 'before');
    expect(result).toEqual({ start: 20, end: 30 });
  });

  it('"at" clamps end to duration', () => {
    const result = computeQuickClipRange(115, 120, 'at');
    expect(result).toEqual({ start: 115, end: 120 });
  });

  it('"before" clamps start to 0', () => {
    const result = computeQuickClipRange(3, 120, 'before');
    expect(result).toEqual({ start: 0, end: 3 });
  });

  it('accepts custom clip duration', () => {
    const result = computeQuickClipRange(50, 120, 'at', 20);
    expect(result).toEqual({ start: 50, end: 70 });
  });

  it('"at" at time 0 works', () => {
    const result = computeQuickClipRange(0, 120, 'at');
    expect(result).toEqual({ start: 0, end: 10 });
  });

  it('"before" at exact duration works', () => {
    const result = computeQuickClipRange(120, 120, 'before');
    expect(result).toEqual({ start: 110, end: 120 });
  });

  it('"at" returns null when currentTime equals duration', () => {
    expect(computeQuickClipRange(120, 120, 'at')).toBeNull();
  });
});