<?php

use MediaWiki\Extension\Math\InvalidTeXException;
use MediaWiki\Extension\Math\MathRestbaseException;
use MediaWiki\Extension\Math\MathRestbaseInterface;
use MediaWiki\Extension\Math\Tests\MathMockHttpTrait;
use Wikimedia\Http\MultiHttpClient;

/**
 * Test the interface to access Restbase paths
 * /media/math/check/{type}
 * /media/math/render/{format}/{hash}
 *
 * @covers \MediaWiki\Extension\Math\MathRestbaseInterface
 *
 * @group Math
 *
 * @license GPL-2.0-or-later
 */
class MathRestbaseInterfaceTest extends MediaWikiIntegrationTestCase {
	use MathMockHttpTrait;

	public function testSuccess() {
		$this->setupGoodMathRestBaseMockHttp();

		$input = '\\sin x^2';
		$rbi = new MathRestbaseInterface( $input );
		$this->assertTrue( $rbi->getSuccess(), "Assuming that $input is valid input." );
		$this->assertEquals( '\\sin x^{2}', $rbi->getCheckedTex() );
		$this->assertStringContainsString( '<mi>sin</mi>', $rbi->getMathML() );
		$this->assertStringContainsString( '/svg/RESOURCE_LOCATION', $rbi->getFullSvgUrl() );
	}

	public function testBatchEvaluate() {
		$body = [
			'success' => true,
			'checked' => 'CHECKED',
			'identifiers' => []
		];

		$response = [
			'code' => 200,
			'headers' => [],
			'body' => json_encode( $body )
		];

		$responses = [
			[ // for https://wikimedia.org/api/rest_v1/media/math/check/tex with input1
				'headers' => [ 'x-resource-location' => 'deadbeef1' ],
				'body' => json_encode( [ 'checked' => 'CHECKED1' ] + $body )
			] + $response,

			[ // for https://wikimedia.org/api/rest_v1/media/math/check/tex with input2
				'headers' => [ 'x-resource-location' => 'deadbeef2' ],
				'body' => json_encode( [ 'checked' => 'CHECKED2' ] + $body )
			] + $response,

			[ // for https://wikimedia.org/api/rest_v1/media/math/render/mml/deadbeef1
				'body' => 'MML1'
			] + $response,

			[ // for https://wikimedia.org/api/rest_v1/media/math/render/mml/deadbeef2
				'body' => 'MML2'
			] + $response,
		];

		$httpClient = $this->createNoOpMock( MultiHttpClient::class, [ 'runMulti' ] );
		$httpClient->method( 'runMulti' )->willReturnCallback(
			static function ( array $requests ) use ( &$responses ) {
				foreach ( $requests as &$req ) {
					$resp = array_shift( $responses );
					$req['response'] = $resp;
				}
				return $requests;
			}
		);

		$this->installMockHttp( $httpClient );

		// NOTE: Using fake response, the input is ignored.
		$rbi1 = new MathRestbaseInterface( 'input1' );
		$rbi2 = new MathRestbaseInterface( 'input2' );

		MathRestbaseInterface::batchEvaluate( [ $rbi1, $rbi2 ] );

		$this->assertTrue( $rbi1->getSuccess() );
		$this->assertEquals( 'CHECKED1', $rbi1->getCheckedTex() );
		$this->assertEquals( 'MML1', $rbi1->getMathML() );

		$this->assertTrue( $rbi2->getSuccess() );
		$this->assertEquals( 'CHECKED2', $rbi2->getCheckedTex() );
		$this->assertEquals( 'MML2', $rbi2->getMathML() );
	}

	public function testFail() {
		$this->setupBadMathRestBaseMockHttp();

		$input = '\\sin\\newcommand';
		$rbi = new MathRestbaseInterface( $input );
		$this->assertFalse( $rbi->getSuccess(), "Assuming that $input is invalid input." );
		$this->assertNull( $rbi->getCheckedTex() );
		$this->assertEquals( 'Illegal TeX function', $rbi->getError()->error->message );
	}

	public function testChem() {
		$this->setupGoodChemRestBaseMockHttp();

		$input = '\ce{H2O}';
		$rbi = new MathRestbaseInterface( $input, 'chem' );
		$this->assertTrue( $rbi->checkTeX(), "Assuming that $input is valid input." );
		$this->assertTrue( $rbi->getSuccess(), "Assuming that $input is valid input." );
		$this->assertEquals( '{\ce {H2O}}', $rbi->getCheckedTex() );
		$this->assertStringContainsString( '<msubsup>', $rbi->getMathML() );
		$this->assertStringContainsString( '<mtext>H</mtext>', $rbi->getMathML() );
	}

	public function testException() {
		$this->setupBadMathRestBaseMockHttp();

		$input = '\\sin\\newcommand';
		$rbi = new MathRestbaseInterface( $input );
		$this->expectException( InvalidTeXException::class );
		$this->expectExceptionMessage( 'TeX input is invalid.' );
		$rbi->getMathML();
	}

	public function testExceptionSvg() {
		$this->setupBadMathRestBaseMockHttp();

		$input = '\\sin\\newcommand';
		$rbi = new MathRestbaseInterface( $input );
		$this->expectException( InvalidTeXException::class );
		$this->expectExceptionMessage( 'TeX input is invalid.' );
		$rbi->getFullSvgUrl();
	}

	/**
	 * Incorporate the "details" in the error message, if the check requests passes, but the
	 * mml/svg/complete endpoints returns an error
	 */
	public function testLateError() {
		// phpcs:ignore Generic.Files.LineLength.TooLong
		$input = '{"type":"https://mediawiki.org/wiki/HyperSwitch/errors/bad_request","title":"Bad Request","method":"POST","detail":["TeX parse error: Missing close brace"],"uri":"/complete"}';
		$this->expectException( MathRestbaseException::class );
		$this->expectExceptionMessage( 'Cannot get mml. TeX parse error: Missing close brace' );
		MathRestbaseInterface::throwContentError( 'mml', $input );
	}

	/**
	 * Incorporate the "details" in the error message, if the check requests passes, but the
	 * mml/svg/complete endpoints returns an error
	 */
	public function testLateErrorString() {
		// phpcs:ignore Generic.Files.LineLength.TooLong
		$input = '{"type":"https://mediawiki.org/wiki/HyperSwitch/errors/bad_request","title":"Bad Request","method":"POST","detail": "TeX parse error: Missing close brace","uri":"/complete"}';
		$this->expectException( MathRestbaseException::class );
		$this->expectExceptionMessage( 'Cannot get mml. TeX parse error: Missing close brace' );
		MathRestbaseInterface::throwContentError( 'mml', $input );
	}

	public function testLateErrorNoDetail() {
		$input = '';
		$this->expectException( MathRestbaseException::class );
		$this->expectExceptionMessage( 'Cannot get mml. Server problem.' );
		MathRestbaseInterface::throwContentError( 'mml', $input );
	}

	public function testUrlUsedByCheckTeX() {
		$path = 'media/math/check/tex';
		$config = [
			'MathFullRestbaseURL' => 'https://myWiki.test/',
			'MathInternalRestbaseURL' => 'http://restbase.test.internal/api/myWiki/'
		];

		$expected = [
			'url' => "http://restbase.test.internal/api/myWiki/v1/$path",
			'method' => 'POST',
			'body' => [ 'type' => 'tex', 'q' => '\sin\newcommand' ]
		];

		$response = [
			'headers' => [
				'x-resource-location' => 'deadbeef'
			],
			'body' => json_encode( [
				'success' => true,
				'checked' => 'who cares',
				'identifiers' => [],
			] )
		];

		$this->expectMathRestBaseMockHttpRequest( [ $expected ], [ $response ] );

		$this->overrideConfigValues( $config );

		$input = '\\sin\\newcommand';
		$rbi = new MathRestbaseInterface( $input );

		$rbi->checkTeX();
	}

	public function testUrlUsedByGetML() {
		$path1 = 'media/math/check/tex';
		$path2 = 'media/math/render/mml/deadbeef';

		$config = [
			'MathFullRestbaseURL' => 'https://myWiki.test/',
			'MathInternalRestbaseURL' => 'http://restbase.test.internal/api/myWiki/'
		];

		$expectedList = [
			[
				'url' => "http://restbase.test.internal/api/myWiki/v1/$path1",
				'method' => 'POST'
			],
			[
				'url' => "http://restbase.test.internal/api/myWiki/v1/$path2",
				'method' => 'GET'
			],
		];

		$response1 = [
			'headers' => [
				'x-resource-location' => 'deadbeef'
			],
			'body' => json_encode( [
				'success' => true,
				'checked' => 'who cares',
				'identifiers' => [],
			] )
		];
		$response2 = [
			'body' => 'who cares'
		];

		$this->expectMathRestBaseMockHttpRequest( $expectedList, [ $response1, $response2 ] );

		$this->overrideConfigValues( $config );

		$input = '\\sin\\newcommand';
		$rbi = new MathRestbaseInterface( $input );

		$rbi->getMathML();
	}

	public static function provideTestGetUrl() {
		$path = 'media/math/render/svg/2uejd9dj3jd';
		$config = [
			'MathFullRestbaseURL' => 'https://myWiki.test/',
			'MathInternalRestbaseURL' => 'http://restbase.test.internal/api/myWiki/'
		];

		yield 'External restbase URL case' => [
			$path,
			false,
			$config,
			'https://myWiki.test/v1/media/math/render/svg/2uejd9dj3jd'
		];

		yield 'Internal restbase URL case' => [
			$path,
			true,
			$config,
			'http://restbase.test.internal/api/myWiki/v1/media/math/render/svg/2uejd9dj3jd'
		];
	}

	/**
	 * @dataProvider provideTestGetUrl
	 * @param string $path
	 * @param bool $internal
	 * @param array $config
	 * @param string $expected
	 */
	public function testGetUrl( $path, $internal, $config, $expected ) {
		$this->overrideConfigValues( $config );
		$input = '\\sin\\newcommand';
		$rbi = new MathRestbaseInterface( $input );
		$actual = $rbi->getUrl( $path, $internal );
		$this->assertSame( $expected, $actual );
	}

	public function testGetType() {
		$tex = '\testing tex';
		$type = 'test';
		$interface = new MathRestbaseInterface( $tex, $type );

		$this->assertEquals( $type, $interface->getType() );
	}

	public function testGetTex() {
		$tex = '\tesing tex';
		$interface = new MathRestbaseInterface( $tex );

		$this->assertEquals( $tex, $interface->getTex() );
	}

	public function testEvaluateRestbaseCheckResponse() {
		$response = [
			'code' => 200,
			'headers' => [
				'x-resource-location' => 'deadbeef'
			],
			'body' => json_encode( [
				'success' => true,
				'checked' => 'who cares',
				'identifiers' => [ 'identifier1', 'identifier2' ],
				'warnings' => [ 'Warning 1', 'Warning 2' ]
			] )
		];

		$rbi = new MathRestbaseInterface();
		$result = $rbi->evaluateRestbaseCheckResponse( $response );

		$this->assertTrue( $result );
		$this->assertTrue( $rbi->getSuccess() );
		$this->assertSame( 'who cares', $rbi->getCheckedTex() );
		$this->assertSame( [ 'identifier1', 'identifier2' ], $rbi->getIdentifiers() );
		$this->assertSame( [ 'Warning 1', 'Warning 2' ], $rbi->getWarnings() );
		$this->assertNull( $rbi->getError() );
	}

	public function testEvaluateRestbaseCheckResponseWithErrorMessage() {
		$errorResponse = [
			'code' => 400,
			'body' => json_encode( [
				'detail' => [
					'success' => false,
					'message' => 'Invalid input'
				]
			] )
		];

		$rbi = new MathRestbaseInterface();
		$result = $rbi->evaluateRestbaseCheckResponse( $errorResponse );

		$this->assertFalse( $result );
		$this->assertFalse( $rbi->getSuccess() );
		$this->assertNull( $rbi->getCheckedTex() );
		$this->assertNull( $rbi->getIdentifiers() );
		$this->assertSame( [], $rbi->getWarnings() );
		$this->assertNotNull( $rbi->getError() );
	}

	public function testEvaluateRestbaseCheckResponseWithFailure() {
		$errorResponseWithoutDetail = [
			'code' => 400,
			'body' => json_encode( [
				'message' => 'Invalid input'
			] )
		];

		$rbi = new MathRestbaseInterface();
		$result = $rbi->evaluateRestbaseCheckResponse( $errorResponseWithoutDetail );

		$this->assertFalse( $result );
		$this->assertFalse( $rbi->getSuccess() );
		$this->assertNull( $rbi->getCheckedTex() );
		$this->assertNull( $rbi->getIdentifiers() );
		$this->assertSame( [], $rbi->getWarnings() );
		$this->assertNotNull( $rbi->getError() );
		$this->assertSame( 'Math extension cannot connect to Restbase.', $rbi->getError()->error->message );
	}
}