<?php

use XcVm\Core\Util\ImageUtils;
use PHPUnit\Framework\TestCase;

/**
 * @covers ImageUtils
 */
final class ImageUtilsTest extends TestCase {

	public function testKeepAspectRatioDownscales() {
		$size = ImageUtils::getImageSizeKeepAspectRatio(1000, 500, 100, 100);
		$this->assertEquals(100, $size['width']);
		$this->assertEquals(50, $size['height']);
	}

	public function testKeepAspectRatioDoesNotUpscale() {
		$size = ImageUtils::getImageSizeKeepAspectRatio(50, 50, 100, 100);
		$this->assertEquals(50, $size['width']);
		$this->assertEquals(50, $size['height']);
	}

	public function testKeepAspectRatioTreatsZeroMaxAsUnbounded() {
		$size = ImageUtils::getImageSizeKeepAspectRatio(200, 100, 0, 50);
		$this->assertEquals(100, $size['width']);
		$this->assertEquals(50, $size['height']);
	}

	public function testValidateUrlTakesAMissingImage() {
		// A stream with no icon has a NULL stream_icon; get_live_streams passed it
		// straight in and died with a TypeError for the whole list.
		$this->assertSame('', ImageUtils::validateURL(null));
	}

	public function testValidateUrlKeepsAPlainUrl() {
		$this->assertSame('http://example.com/logo.png', ImageUtils::validateURL('http://example.com/logo.png'));
		$this->assertSame('', ImageUtils::validateURL(''));
	}

	public function testIsAbsoluteUrl() {
		$this->assertTrue(ImageUtils::isAbsoluteUrl('http://example.com/a.png'));
		$this->assertTrue(ImageUtils::isAbsoluteUrl('https://example.com/a.png'));
		$this->assertFalse(ImageUtils::isAbsoluteUrl('/relative/a.png'));
		$this->assertFalse(ImageUtils::isAbsoluteUrl('a.png'));
	}

	/**
	 * Callers hand over optional columns (a stream without an icon, a movie
	 * without a backdrop). What cannot be downloaded comes back unchanged —
	 * null included; it used to end the save with a TypeError.
	 */
	public function testDownloadImageReturnsWhatItCannotDownload() {
		$this->assertNull(ImageUtils::downloadImage(null, 1));
		$this->assertSame('', ImageUtils::downloadImage(''));
		$this->assertSame('/images/local.png', ImageUtils::downloadImage('/images/local.png', 2));
	}
}