import { describe, expect, it } from 'vitest';
import { pagesRead, parseProgress } from './progress';
import { parsePdfLocator, pdfLocator } from './shared';

describe('progress payload', () => {
	it('accepts a reader save and rounds the percent', () => {
		expect(
			parseProgress({
				fileId: 3,
				locator: 'epubcfi(/6/4!/4/2)',
				percent: 12.34567,
				sessionId: null
			})
		).toMatchObject({ fileId: 3, locator: 'epubcfi(/6/4!/4/2)', percent: 12.35 });
	});
	it.each([
		null,
		'nope',
		{},
		{ percent: -1 },
		{ percent: 101 },
		{ percent: 'ten' },
		{ percent: 10, page: 1.5 },
		{ percent: 10, fileId: -2 },
		{ percent: 10, locator: 'x'.repeat(2001) }
	])('rejects %j', (body) => {
		expect(parseProgress(body)).toBeNull();
	});
});

describe('pages read', () => {
	it('uses the page delta when pages are known', () => {
		expect(pagesRead({ startPage: 10, endPage: 34 })).toBe(24);
	});
	it('scales the percent delta by the page count', () => {
		expect(pagesRead({ startPercent: 10, endPercent: 20, pageCount: 300 })).toBe(30);
	});
	it('never goes negative and needs enough data', () => {
		expect(pagesRead({ startPage: 50, endPage: 20 })).toBe(0);
		expect(pagesRead({ startPercent: 40, endPercent: 30, pageCount: 100 })).toBe(0);
		expect(pagesRead({ startPercent: 10, endPercent: 20 })).toBeNull();
	});
});

describe('pdf locators', () => {
	it('round-trips pages and rects', () => {
		const loc = pdfLocator(12, [{ x: 0.1, y: 0.2, w: 0.3333333, h: 0.02 }]);
		expect(loc).toBe('page:12#r=0.1,0.2,0.3333,0.02');
		expect(parsePdfLocator(loc)).toEqual({
			page: 12,
			rects: [{ x: 0.1, y: 0.2, w: 0.3333, h: 0.02 }]
		});
		expect(parsePdfLocator('page:3')).toEqual({ page: 3, rects: [] });
		expect(parsePdfLocator('epubcfi(/6/2)')).toBeNull();
	});
});