<?php

declare(strict_types=1);

namespace WebThumbnailer;

use PHPUnit\Framework\TestCase;
use WebThumbnailer\Application\ConfigManager;
use WebThumbnailer\Utils\FileUtils;

/**
 * Test library front end using a local server launched by PHPUnit.
 */
class WebThumbnailerTest extends TestCase
{
    /**
     * PHP builtin local server URL.
     */
    protected const LOCAL_SERVER = 'http://localhost:8081/';

    /**
     * @var string relative path.
     */
    protected static $cache = 'tests/workdir/cache/';

    /**
     * @var string relative path.
     */
    protected static $tmp = 'tests/workdir/tmp/';

    /**
     * @var string relative path.
     */
    protected static $expected = 'tests/resources/expected-thumbs/';

    /**
     * @var string relative path were GD will regenerate expected image.
     */
    protected static $regenerated = 'tests/workdir/regnerated/';

    /**
     * Load test config before running tests.
     */
    public function setUp(): void
    {
        $resource = 'tests/resources/';
        ConfigManager::clear();
        ConfigManager::addFile($resource . 'settings-useful.json');
    }

    /**
     * Remove cache folder after every tests.
     */
    public function tearDown(): void
    {
        FileUtils::rmdir(self::$cache);
        FileUtils::rmdir(self::$tmp);
        FileUtils::rmdir(self::$regenerated);
    }

    /**
     * Simple image URL.
     */
    public function testDirectImage(): void
    {
        $image = 'default/image.png';
        $this->regenerate($image);
        $expected = self::$regenerated . $image;
        $url = self::LOCAL_SERVER . $image;
        $wt = new WebThumbnailer();
        $thumb = $wt->thumbnail($url);
        $this->assertEquals(base64_encode(file_get_contents($expected)), base64_encode(file_get_contents($thumb)));
        $this->assertFileEquals($expected, $thumb);
    }

    /**
     * Simple image URL without extension.
     */
    public function testDirectImageWithoutExtension(): void
    {
        $image = 'default/image';
        $this->regenerate($image);
        $expected = self::$regenerated . $image;
        $url = self::LOCAL_SERVER . $image;
        $wt = new WebThumbnailer();
        $thumb = $wt->thumbnail($url);
        $this->assertFileEquals($expected, $thumb);
    }

    /**
     * URL which contains an opengraph image.
     */
    public function testOpenGraphImage(): void
    {
        $this->markTestSkipped('Test case depends on non-DFSG resource that was dropped.');
        $image = 'default/le-monde.jpg';
        $this->regenerate($image);
        $expected = self::$regenerated . $image;
        $url = self::LOCAL_SERVER . 'default/le-monde.html';
        $wt = new WebThumbnailer();
        $thumb = $wt->thumbnail($url);
        $this->assertFileEquals($expected, $thumb);
    }

    /**
     * URL which contains an opengraph image with absolute path explicitly set.
     */
    public function testOpenGraphImageAbsolute(): void
    {
        $this->markTestSkipped('Test case depends on non-DFSG resource that was dropped.');
        $image = 'default/le-monde.png';
        $this->regenerate($image);
        mkdir(self::$tmp);
        file_put_contents(
            $conf = self::$tmp . 'tmp.json',
            json_encode([
                'settings' => [
                    'path' => [
                        'cache' => self::$cache,
                    ],
                ],
            ])
        );
        ConfigManager::addFile($conf);
        $expected =  self::$cache
            . 'thumb/421aa90e079fa326b6494f812ad13e79/8f72b887d2e3f64c3a1c719d8058823047d3ec031601600.jpg';
        $url = self::LOCAL_SERVER . 'default/le-monde.html';
        $wt = new WebThumbnailer();
        $thumb = $wt->thumbnail($url);
        $this->assertEquals($expected, $thumb);
        $this->assertFileEquals($expected, $thumb);
    }

    /**
     * Get a file URL which isn't an image.
     */
    public function testNotAnImage(): void
    {
        $oldlog = ini_get('error_log');
        ini_set('error_log', '/dev/null');

        $image = 'default/not-image.txt';
        $url = self::LOCAL_SERVER . $image;
        $wt = new WebThumbnailer();
        $this->assertFalse($wt->thumbnail($url));

        ini_set('error_log', $oldlog);
    }

    /**
     * Simple image URL in download mode, resizing with max width.
     */
    public function testDownloadDirectImageResizeWidth(): void
    {
        $image = 'default/image-width-341.png';
        $this->regenerate($image);
        $expected = self::$regenerated . $image;
        $url = self::LOCAL_SERVER . 'default/image.png';
        $wt = new WebThumbnailer();
        $wt = $wt->maxWidth(341);
        $thumb = $wt->thumbnail($url);
        $this->assertFileEquals($expected, $thumb);
    }

    /**
     * Simple image URL in download mode, resizing with max height.
     */
    public function testDownloadDirectImageResizeHeight(): void
    {
        $image = 'default/image-height-341.png';
        $this->regenerate($image);
        $expected = self::$regenerated . $image;
        $url = self::LOCAL_SERVER . 'default/image.png';
        $wt = new WebThumbnailer();
        $wt = $wt->maxHeight(341);
        $thumb = $wt->thumbnail($url);
        $this->assertFileEquals($expected, $thumb);
    }

    /**
     * Simple image URL in download mode, resizing with max width and max height.
     */
    public function testDownloadDirectImageResizeBothWidth(): void
    {
        $image = 'default/image-width-341.png';
        $this->regenerate($image);
        $expected = self::$regenerated . $image;
        $url = self::LOCAL_SERVER . 'default/image.png';
        $wt = new WebThumbnailer();
        $wt = $wt->maxWidth(341)->maxHeight(341);
        $thumb = $wt->thumbnail($url);
        $this->assertFileEquals($expected, $thumb);
    }

    /**
     * Simple image URL in download mode, resizing with max height and max height, with vertical image.
     */
    public function testDownloadDirectImageResizeBothHeight(): void
    {
        $image = 'default/image-vertical-height-341.png';
        $this->regenerate($image);
        $expected = self::$regenerated . $image;
        $url = self::LOCAL_SERVER . 'default/image-vertical.png';
        $wt = new WebThumbnailer();
        $wt = $wt->maxHeight(341)->maxWidth(341);
        $thumb = $wt->thumbnail($url);
        $this->assertFileEquals($expected, $thumb);
    }

    /**
     * Simple image URL in download mode, crop enabled without both dimensions.
     */
    public function testDownloadDirectImageResizeWidthCrop(): void
    {
        $oldlog = ini_get('error_log');
        ini_set('error_log', '/dev/null');

        $url = self::LOCAL_SERVER . 'default/image.png';
        $wt = new WebThumbnailer();
        $wt = $wt->maxWidth(341)->crop(true);
        $this->assertFalse(@$wt->thumbnail($url));

        ini_set('error_log', $oldlog);
    }

    /**
     * Simple image URL in download mode, crop enabled without both dimensions.
     */
    public function testDownloadDirectImageResizeHeightCrop(): void
    {
        $oldlog = ini_get('error_log');
        ini_set('error_log', '/dev/null');

        $url = self::LOCAL_SERVER . 'default/image.png';
        $wt = new WebThumbnailer();
        $wt = $wt->maxHeight(341)->crop(true);
        $this->assertFalse($wt->thumbnail($url));

        ini_set('error_log', $oldlog);
    }

    /**
     * Simple image URL in download mode, resizing with max height/width + crop.
     */
    public function testDownloadDirectImageResizeWidthHeightCrop(): void
    {
        $image = 'default/image-crop-341-341.png';
        $this->regenerate($image, true);
        $expected = self::$regenerated . $image;
        $url = self::LOCAL_SERVER . 'default/image-crop.png';
        $wt = new WebThumbnailer();
        $wt = $wt->maxHeight(341)->maxWidth(341)->crop(true);
        $thumb = $wt->thumbnail($url);
        $this->assertEquals(base64_encode(file_get_contents($expected)), base64_encode(file_get_contents($thumb)));
        $this->assertFileEquals($expected, $thumb);
    }

    /**
     * Simple image URL in download mode, resizing with max height/width + crop.
     * Override max heigth/width using array settings.
     */
    public function testDownloadDirectImageResizeWidthHeightCropOverride(): void
    {
        $image = 'default/image-crop-120-160.png';
        $this->regenerate($image, true);
        $expected = self::$regenerated . $image;
        $url = self::LOCAL_SERVER . 'default/image-crop.png';
        $wt = new WebThumbnailer();
        $wt = $wt->maxHeight(341)->maxWidth(341)->crop(true);
        $thumb = $wt->thumbnail(
            $url,
            [
                WebThumbnailer::MAX_WIDTH => 120,
                WebThumbnailer::MAX_HEIGHT => 160,
            ]
        );
        $this->assertEquals(base64_encode(file_get_contents($expected)), base64_encode(file_get_contents($thumb)));
        $this->assertFileEquals($expected, $thumb);
    }

    /**
     * Simple image URL, in hotlink mode.
     */
    public function testHotlinkSimpleImage(): void
    {
        $url = self::LOCAL_SERVER . 'default/image.png';
        $wt = new WebThumbnailer();
        $thumb = $wt->modeHotlink()->thumbnail($url);
        $this->assertEquals($url, $thumb);
    }

    /**
     * Simple image URL without extension, in hotlink mode.
     */
    public function testHotlinkSimpleImageWithoutExtension(): void
    {
        $url = self::LOCAL_SERVER . 'default/image';
        $wt = new WebThumbnailer();
        $thumb = $wt->modeHotlink()->thumbnail($url);
        $this->assertEquals($url, $thumb);
    }

    /**
     * Simple opengraph URL, in hotlink mode.
     */
    public function testHotlinkOpenGraph(): void
    {
        $this->markTestSkipped('Test case depends on non-DFSG resource that was dropped.');
        $expected = 'https://img.lemde.fr/2016/10/21/107/0/1132/566/1440/720/60/0/fe3b107_3522-d2olbw.y93o25u3di.jpg';
        $url = self::LOCAL_SERVER . 'default/le-monde.html';
        $wt = new WebThumbnailer();
        $thumb = $wt->modeHotlink()->thumbnail($url);
        $this->assertEquals($expected, $thumb);
    }

    /**
     * Simple opengraph URL, in hotlink mode set by config file.
     */
    public function testHotlinkOpenGraphJsonConfig(): void
    {
        $this->markTestSkipped('Test case depends on non-DFSG resource that was dropped.');
        $expected = 'https://img.lemde.fr/2016/10/21/107/0/1132/566/1440/720/60/0/fe3b107_3522-d2olbw.y93o25u3di.jpg';
        $url = self::LOCAL_SERVER . 'default/le-monde.html';
        $wt = new WebThumbnailer();
        ConfigManager::addFile('tests/resources/settings-hotlink.json');
        $thumb = $wt->thumbnail($url);
        $this->assertEquals($expected, $thumb);
    }

    /**
     * Duplicate expected thumbnails using the current GD version.
     *
     * Different versions of GD will result in slightly different images,
     * which would make the comparaison test fail. By regenerating expected thumbs,
     * the expected and actual result should be the same.
     *
     * @param string $image          relative path of the expected thumb inside the expected thumb directory.
     * @param bool   $crop           Set to true to apply the crop function.
     * @param int[]  $cropParameters Crop parameters: x, y, width and height
     *
     * @throws \Exception couldn't create the image.
     */
    public function regenerate(string $image, bool $crop = false, array $cropParameters = []): void
    {
        $targetFolder = dirname(self::$regenerated . $image);
        if (! is_dir($targetFolder)) {
            mkdir($targetFolder, 0755, true);
        }

        $content = file_get_contents(self::$expected . $image);
        $sourceImg = @imagecreatefromstring($content);
        $width = imagesx($sourceImg);
        $height = imagesy($sourceImg);

        $targetImg = imagecreatetruecolor($width, $height);
        if (
            !imagecopyresized(
                $targetImg,
                $sourceImg,
                0,
                0,
                0,
                0,
                $width,
                $height,
                $width,
                $height
            )
        ) {
            @imagedestroy($sourceImg);
            @imagedestroy($targetImg);
            throw new \Exception('Could not generate the thumbnail from source image.');
        }

        if ($crop) {
            if (!empty($cropParameters)) {
                [$x, $y, $cropWidth, $croptHeight] = $cropParameters;
            }

            $targetImg = imagecrop($targetImg, [
                'x' => $x ?? 0,
                'y' => $y ?? 0,
                'width' => $cropWidth ?? $width,
                'height' => $croptHeight ?? $height
            ]);
        }

        $target = self::$regenerated . $image;
        imagedestroy($sourceImg);
        imagejpeg($targetImg, $target);
        imagedestroy($targetImg);
    }
}