<?php

namespace MediaWiki\Tests\Rest;

use GuzzleHttp\Psr7\Uri;
use MediaWiki\MainConfigNames;
use MediaWiki\Rest\BasicAccess\StaticBasicAuthorizer;
use MediaWiki\Rest\Handler;
use MediaWiki\Rest\HttpException;
use MediaWiki\Rest\RedirectException;
use MediaWiki\Rest\Reporter\ErrorReporter;
use MediaWiki\Rest\RequestData;
use MediaWiki\Rest\RequestInterface;
use MediaWiki\Rest\ResponseException;
use MediaWiki\Rest\Router;
use PHPUnit\Framework\MockObject\MockObject;
use RuntimeException;
use Throwable;

/**
 * @covers \MediaWiki\Rest\Router
 */
class RouterTest extends \MediaWikiUnitTestCase {
	use RestTestTrait;

	private const CANONICAL_SERVER = 'https://wiki.example.com';
	private const INTERNAL_SERVER = 'http://api.local:8080';

	/** @var Throwable[] */
	private $reportedErrors = [];

	/**
	 * @param RequestInterface $request
	 * @param string|null $authError
	 * @param string[] $additionalRouteFiles
	 * @return Router
	 */
	private function createRouter(
		RequestInterface $request,
		$authError = null,
		$additionalRouteFiles = []
	) {
		$routeFiles = array_merge( [ __DIR__ . '/testRoutes.json' ], $additionalRouteFiles );

		/** @var MockObject|ErrorReporter $mockErrorReporter */
		$mockErrorReporter = $this->createNoOpMock( ErrorReporter::class, [ 'reportError' ] );
		$mockErrorReporter->method( 'reportError' )
			->willReturnCallback( function ( $e ) {
				$this->reportedErrors[] = $e;
			} );

		$config = [
			MainConfigNames::CanonicalServer => self::CANONICAL_SERVER,
			MainConfigNames::InternalServer => self::INTERNAL_SERVER,
			MainConfigNames::RestPath => '/rest'
		];

		return $this->newRouter( [
			'routeFiles' => $routeFiles,
			'request' => $request,
			'config' => $config,
			'errorReporter' => $mockErrorReporter,
			'basicAuth' => new StaticBasicAuthorizer( $authError ),
		] );
	}

	public function testPrefixMismatch() {
		$request = new RequestData( [ 'uri' => new Uri( '/bogus' ) ] );
		$router = $this->createRouter( $request );
		$response = $router->execute( $request );
		$this->assertSame( 404, $response->getStatusCode() );
	}

	public function testWrongMethod() {
		$request = new RequestData( [
			'uri' => new Uri( '/rest/mock/RouterTest/hello' ),
			'method' => 'TRACE'
		] );
		$router = $this->createRouter( $request );
		$response = $router->execute( $request );
		$this->assertSame( 405, $response->getStatusCode() );
		$this->assertSame( 'Method Not Allowed', $response->getReasonPhrase() );
		$this->assertSame( 'HEAD, GET', $response->getHeaderLine( 'Allow' ) );
	}

	public function testHeadToGet() {
		$request = new RequestData( [
			'uri' => new Uri( '/rest/mock/RouterTest/hello' ),
			'method' => 'HEAD'
		] );
		$router = $this->createRouter( $request );
		$response = $router->execute( $request );
		$this->assertSame( 200, $response->getStatusCode() );
	}

	public function testNoMatch() {
		$request = new RequestData( [ 'uri' => new Uri( '/rest/bogus' ) ] );
		$router = $this->createRouter( $request );
		$response = $router->execute( $request );
		$this->assertSame( 404, $response->getStatusCode() );
		// TODO: add more information to the response body and test for its presence here
	}

	public static function throwHandlerFactory() {
		return new class extends Handler {
			public function execute() {
				throw new HttpException( 'Mock error', 555 );
			}
		};
	}

	public static function fatalHandlerFactory() {
		return new class extends Handler {
			public function execute() {
				throw new RuntimeException( 'Fatal mock error', 12345 );
			}
		};
	}

	public static function throwRedirectHandlerFactory() {
		return new class extends Handler {
			public function execute() {
				throw new RedirectException( 301, 'http://example.com' );
			}
		};
	}

	public static function throwWrappedHandlerFactory() {
		return new class extends Handler {
			public function execute() {
				$response = $this->getResponseFactory()->create();
				$response->setStatus( 200 );
				throw new ResponseException( $response );
			}
		};
	}

	public function testHttpException() {
		$request = new RequestData( [ 'uri' => new Uri( '/rest/mock/RouterTest/throw' ) ] );
		$router = $this->createRouter( $request );
		$response = $router->execute( $request );
		$this->assertSame( 555, $response->getStatusCode() );
		$body = $response->getBody();
		$body->rewind();
		$data = json_decode( $body->getContents(), true );
		$this->assertSame( 'Mock error', $data['message'] );
	}

	public function testFatalException() {
		$request = new RequestData( [ 'uri' => new Uri( '/rest/mock/RouterTest/fatal' ) ] );
		$router = $this->createRouter( $request );
		$response = $router->execute( $request );
		$this->assertSame( 500, $response->getStatusCode() );
		$body = $response->getBody();
		$body->rewind();
		$data = json_decode( $body->getContents(), true );
		$this->assertStringContainsString( 'RuntimeException', $data['message'] );
		$this->assertNotEmpty( $this->reportedErrors );
		$this->assertInstanceOf( RuntimeException::class, $this->reportedErrors[0] );
	}

	public function testRedirectException() {
		$request = new RequestData( [ 'uri' => new Uri( '/rest/mock/RouterTest/throwRedirect' ) ] );
		$router = $this->createRouter( $request );
		$response = $router->execute( $request );
		$this->assertSame( 301, $response->getStatusCode() );
		$this->assertSame( 'http://example.com', $response->getHeaderLine( 'Location' ) );
	}

	public function testResponseException() {
		$request = new RequestData( [ 'uri' => new Uri( '/rest/mock/RouterTest/throwWrapped' ) ] );
		$router = $this->createRouter( $request );
		$response = $router->execute( $request );
		$this->assertSame( 200, $response->getStatusCode() );
	}

	public function testBasicAccess() {
		// Using the throwing handler is a way to assert that the handler is not executed
		$request = new RequestData( [ 'uri' => new Uri( '/rest/mock/RouterTest/throw' ) ] );
		$router = $this->createRouter( $request, 'test-error', [] );
		$response = $router->execute( $request );
		$this->assertSame( 403, $response->getStatusCode() );
		$body = $response->getBody();
		$body->rewind();
		$data = json_decode( $body->getContents(), true );
		$this->assertSame( 'test-error', $data['error'] );
	}

	/**
	 * @dataProvider providePaths
	 */
	public function testAdditionalEndpoints( $path ) {
		$request = new RequestData( [
			'uri' => new Uri( $path )
		] );
		$router = $this->createRouter(
			$request,
			null,
			[ __DIR__ . '/testAdditionalRoutes.json' ]
		);
		$response = $router->execute( $request );
		$this->assertSame( 200, $response->getStatusCode() );
	}

	public static function providePaths() {
		return [
			[ '/rest/mock/RouterTest/hello' ],
			[ '/rest/mock/RouterTest/hello/two' ],
		];
	}

	public static function provideGetRouteUrl() {
		yield 'empty' => [ '', '', [], [] ];
		yield 'simple route' => [ '/foo/bar', '/foo/bar' ];
		yield 'simple route with query' =>
			[ '/foo/bar', '/foo/bar?x=1&y=2', [ 'x' => '1', 'y' => '2' ] ];
		yield 'simple route with strange query chars' =>
			[ '/foo+bar', '/foo+bar?x=%23&y=%25&z=%2B', [ 'x' => '#', 'y' => '%', 'z' => '+' ] ];
		yield 'route with simple path params' =>
			[ '/foo/{test}/baz', '/foo/bar/baz', [], [ 'test' => 'bar' ] ];
		yield 'route with strange path params' =>
			[ '/foo/{test}/baz', '/foo/b%25%2F%2Bz/baz', [], [ 'test' => 'b%/+z' ] ];
		yield 'space in path does not become a plus' =>
			[ '/foo/{test}/baz', '/foo/b%20z/baz', [], [ 'test' => 'b z' ] ];
		yield 'route with simple path params and query' =>
			[ '/foo/{test}/baz', '/foo/bar/baz?x=1', [ 'x' => '1' ], [ 'test' => 'bar' ] ];
	}

	/**
	 * @dataProvider provideGetRouteUrl
	 */
	public function testGetRouteUrl( $route, $expectedUrl, $query = [], $path = [] ) {
		$request = new RequestData( [ 'uri' => new Uri( '/rest/mock/route' ) ] );
		$router = $this->createRouter( $request );

		$url = $router->getRouteUrl( $route, $path, $query );
		$this->assertStringStartsWith( self::CANONICAL_SERVER, $url );

		$uri = new Uri( $url );
		$this->assertStringContainsString( $expectedUrl, $uri );
	}

	/**
	 * @dataProvider provideGetRouteUrl
	 */
	public function testGetPrivateRouteUrl( $route, $expectedUrl, $query = [], $path = [] ) {
		$request = new RequestData( [ 'uri' => new Uri( '/rest/mock/route' ) ] );
		$router = $this->createRouter( $request );

		$url = $router->getPrivateRouteUrl( $route, $path, $query );
		$this->assertStringStartsWith( self::INTERNAL_SERVER, $url );

		$uri = new Uri( $url );
		$this->assertStringContainsString( $expectedUrl, $uri );
	}

}