import { describe, expect, it } from 'vitest';
import type { SheetSpec } from './types';
import { labelPositions, labelsPerPage } from './sheet';

function makeSheet(overrides: Partial<SheetSpec> = {}): SheetSpec {
	return {
		id: 'test-sheet',
		brand: 'Test',
		code: 'T-1',
		pageWidthMm: 210,
		pageHeightMm: 297,
		pageName: 'A4',
		shape: 'rectangle',
		cornerRadiusMm: 0,
		columns: 3,
		rows: 4,
		labelWidthMm: 60,
		labelHeightMm: 40,
		marginLeftMm: 10,
		marginTopMm: 15,
		pitchXMm: 65,
		pitchYMm: 45,
		...overrides
	};
}

describe('labelsPerPage', () => {
	it('is columns times rows', () => {
		expect(labelsPerPage(makeSheet({ columns: 3, rows: 4 }))).toBe(12);
	});
});

describe('labelPositions', () => {
	it('enumerates in reading order: left to right, then top to bottom', () => {
		const sheet = makeSheet({ columns: 2, rows: 2 });
		const positions = labelPositions(sheet);

		expect(positions.map((p) => [p.column, p.row])).toEqual([
			[0, 0],
			[1, 0],
			[0, 1],
			[1, 1]
		]);
		expect(positions.map((p) => p.index)).toEqual([0, 1, 2, 3]);
	});

	it('places each label from the page margin plus its pitch offset', () => {
		const sheet = makeSheet({ columns: 2, rows: 2 });
		const positions = labelPositions(sheet);

		expect(positions[3]).toEqual({
			index: 3,
			column: 1,
			row: 1,
			xMm: sheet.marginLeftMm + sheet.pitchXMm,
			yMm: sheet.marginTopMm + sheet.pitchYMm,
			widthMm: sheet.labelWidthMm,
			heightMm: sheet.labelHeightMm
		});
	});
});