<?php

/**
 * @group ContentHandler
 * @group Database
 *
 * @note Declare that we are using the database, because otherwise we'll fail in the "databaseless" test run.
 * This is because the LinkHolderArray used by the parser needs database access.
 *
 */
class ContentHandlerTest extends MediaWikiTestCase {

	public function setup() {
		global $wgContLang;
		parent::setup();

		$this->setMwGlobals( array(
			'wgExtraNamespaces' => array(
				12312 => 'Dummy',
				12313 => 'Dummy_talk',
			),
			// The below tests assume that namespaces not mentioned here (Help, User, MediaWiki, ..)
			// default to CONTENT_MODEL_WIKITEXT.
			'wgNamespaceContentModels' => array(
				12312 => 'testing',
			),
			'wgContentHandlers' => array(
				CONTENT_MODEL_WIKITEXT => 'WikitextContentHandler',
				CONTENT_MODEL_JAVASCRIPT => 'JavaScriptContentHandler',
				CONTENT_MODEL_CSS => 'CssContentHandler',
				CONTENT_MODEL_TEXT => 'TextContentHandler',
				'testing' => 'DummyContentHandlerForTesting',
			),
		) );

		// Reset namespace cache
		MWNamespace::getCanonicalNamespaces( true );
		$wgContLang->resetNamespaces();
	}

	public function tearDown() {
		global $wgContLang;

		// Reset namespace cache
		MWNamespace::getCanonicalNamespaces( true );
		$wgContLang->resetNamespaces();

		parent::tearDown();
	}

	public static function dataGetDefaultModelFor() {
		return array(
			array( 'Help:Foo', CONTENT_MODEL_WIKITEXT ),
			array( 'Help:Foo.js', CONTENT_MODEL_WIKITEXT ),
			array( 'Help:Foo/bar.js', CONTENT_MODEL_WIKITEXT ),
			array( 'User:Foo', CONTENT_MODEL_WIKITEXT ),
			array( 'User:Foo.js', CONTENT_MODEL_WIKITEXT ),
			array( 'User:Foo/bar.js', CONTENT_MODEL_JAVASCRIPT ),
			array( 'User:Foo/bar.css', CONTENT_MODEL_CSS ),
			array( 'User talk:Foo/bar.css', CONTENT_MODEL_WIKITEXT ),
			array( 'User:Foo/bar.js.xxx', CONTENT_MODEL_WIKITEXT ),
			array( 'User:Foo/bar.xxx', CONTENT_MODEL_WIKITEXT ),
			array( 'MediaWiki:Foo.js', CONTENT_MODEL_JAVASCRIPT ),
			array( 'MediaWiki:Foo.css', CONTENT_MODEL_CSS ),
			array( 'MediaWiki:Foo.JS', CONTENT_MODEL_WIKITEXT ),
			array( 'MediaWiki:Foo.CSS', CONTENT_MODEL_WIKITEXT ),
			array( 'MediaWiki:Foo.css.xxx', CONTENT_MODEL_WIKITEXT ),
		);
	}

	/**
	 * @dataProvider dataGetDefaultModelFor
	 */
	public function testGetDefaultModelFor( $title, $expectedModelId ) {
		$title = Title::newFromText( $title );
		$this->assertEquals( $expectedModelId, ContentHandler::getDefaultModelFor( $title ) );
	}

	/**
	 * @dataProvider dataGetDefaultModelFor
	 */
	public function testGetForTitle( $title, $expectedContentModel ) {
		$title = Title::newFromText( $title );
		$handler = ContentHandler::getForTitle( $title );
		$this->assertEquals( $expectedContentModel, $handler->getModelID() );
	}

	public static function dataGetLocalizedName() {
		return array(
			array( null, null ),
			array( "xyzzy", null ),

			// XXX: depends on content language
			array( CONTENT_MODEL_JAVASCRIPT, '/javascript/i' ),
		);
	}

	/**
	 * @dataProvider dataGetLocalizedName
	 */
	public function testGetLocalizedName( $id, $expected ) {
		$name = ContentHandler::getLocalizedName( $id );

		if ( $expected ) {
			$this->assertNotNull( $name, "no name found for content model $id" );
			$this->assertTrue( preg_match( $expected, $name ) > 0,
				"content model name for #$id did not match pattern $expected"
			);
		} else {
			$this->assertEquals( $id, $name, "localization of unknown model $id should have "
				. "fallen back to use the model id directly."
			);
		}
	}

	public static function dataGetPageLanguage() {
		global $wgLanguageCode;

		return array(
			array( "Main", $wgLanguageCode ),
			array( "Dummy:Foo", $wgLanguageCode ),
			array( "MediaWiki:common.js", 'en' ),
			array( "User:Foo/common.js", 'en' ),
			array( "MediaWiki:common.css", 'en' ),
			array( "User:Foo/common.css", 'en' ),
			array( "User:Foo", $wgLanguageCode ),

			array( CONTENT_MODEL_JAVASCRIPT, 'javascript' ),
		);
	}

	/**
	 * @dataProvider dataGetPageLanguage
	 */
	public function testGetPageLanguage( $title, $expected ) {
		if ( is_string( $title ) ) {
			$title = Title::newFromText( $title );
		}

		$expected = wfGetLangObj( $expected );

		$handler = ContentHandler::getForTitle( $title );
		$lang = $handler->getPageLanguage( $title );

		$this->assertEquals( $expected->getCode(), $lang->getCode() );
	}

	public function testGetContentText_Null() {
		global $wgContentHandlerTextFallback;

		$content = null;

		$wgContentHandlerTextFallback = 'fail';
		$text = ContentHandler::getContentText( $content );
		$this->assertEquals( '', $text );

		$wgContentHandlerTextFallback = 'serialize';
		$text = ContentHandler::getContentText( $content );
		$this->assertEquals( '', $text );

		$wgContentHandlerTextFallback = 'ignore';
		$text = ContentHandler::getContentText( $content );
		$this->assertEquals( '', $text );
	}

	public function testGetContentText_TextContent() {
		global $wgContentHandlerTextFallback;

		$content = new WikitextContent( "hello world" );

		$wgContentHandlerTextFallback = 'fail';
		$text = ContentHandler::getContentText( $content );
		$this->assertEquals( $content->getNativeData(), $text );

		$wgContentHandlerTextFallback = 'serialize';
		$text = ContentHandler::getContentText( $content );
		$this->assertEquals( $content->serialize(), $text );

		$wgContentHandlerTextFallback = 'ignore';
		$text = ContentHandler::getContentText( $content );
		$this->assertEquals( $content->getNativeData(), $text );
	}

	public function testGetContentText_NonTextContent() {
		global $wgContentHandlerTextFallback;

		$content = new DummyContentForTesting( "hello world" );

		$wgContentHandlerTextFallback = 'fail';

		try {
			$text = ContentHandler::getContentText( $content );

			$this->fail( "ContentHandler::getContentText should have thrown an exception for non-text Content object" );
		} catch ( MWException $ex ) {
			// as expected
		}

		$wgContentHandlerTextFallback = 'serialize';
		$text = ContentHandler::getContentText( $content );
		$this->assertEquals( $content->serialize(), $text );

		$wgContentHandlerTextFallback = 'ignore';
		$text = ContentHandler::getContentText( $content );
		$this->assertNull( $text );
	}

	/*
	public static function makeContent( $text, Title $title, $modelId = null, $format = null ) {}
	*/

	public static function dataMakeContent() {
		return array(
			array( 'hallo', 'Help:Test', null, null, CONTENT_MODEL_WIKITEXT, 'hallo', false ),
			array( 'hallo', 'MediaWiki:Test.js', null, null, CONTENT_MODEL_JAVASCRIPT, 'hallo', false ),
			array( serialize( 'hallo' ), 'Dummy:Test', null, null, "testing", 'hallo', false ),

			array( 'hallo', 'Help:Test', null, CONTENT_FORMAT_WIKITEXT, CONTENT_MODEL_WIKITEXT, 'hallo', false ),
			array( 'hallo', 'MediaWiki:Test.js', null, CONTENT_FORMAT_JAVASCRIPT, CONTENT_MODEL_JAVASCRIPT, 'hallo', false ),
			array( serialize( 'hallo' ), 'Dummy:Test', null, "testing", "testing", 'hallo', false ),

			array( 'hallo', 'Help:Test', CONTENT_MODEL_CSS, null, CONTENT_MODEL_CSS, 'hallo', false ),
			array( 'hallo', 'MediaWiki:Test.js', CONTENT_MODEL_CSS, null, CONTENT_MODEL_CSS, 'hallo', false ),
			array( serialize( 'hallo' ), 'Dummy:Test', CONTENT_MODEL_CSS, null, CONTENT_MODEL_CSS, serialize( 'hallo' ), false ),

			array( 'hallo', 'Help:Test', CONTENT_MODEL_WIKITEXT, "testing", null, null, true ),
			array( 'hallo', 'MediaWiki:Test.js', CONTENT_MODEL_CSS, "testing", null, null, true ),
			array( 'hallo', 'Dummy:Test', CONTENT_MODEL_JAVASCRIPT, "testing", null, null, true ),
		);
	}

	/**
	 * @dataProvider dataMakeContent
	 */
	public function testMakeContent( $data, $title, $modelId, $format, $expectedModelId, $expectedNativeData, $shouldFail ) {
		$title = Title::newFromText( $title );

		try {
			$content = ContentHandler::makeContent( $data, $title, $modelId, $format );

			if ( $shouldFail ) {
				$this->fail( "ContentHandler::makeContent should have failed!" );
			}

			$this->assertEquals( $expectedModelId, $content->getModel(), 'bad model id' );
			$this->assertEquals( $expectedNativeData, $content->getNativeData(), 'bads native data' );
		} catch ( MWException $ex ) {
			if ( !$shouldFail ) {
				$this->fail( "ContentHandler::makeContent failed unexpectedly: " . $ex->getMessage() );
			}
			else {
				// dummy, so we don't get the "test did not perform any assertions" message.
				$this->assertTrue( true );
			}
		}
	}

	/*
	public function testSupportsSections() {
		$this->markTestIncomplete( "not yet implemented" );
	}
	*/

	public function testRunLegacyHooks() {
		Hooks::register( 'testRunLegacyHooks', __CLASS__ . '::dummyHookHandler' );

		$content = new WikitextContent( 'test text' );
		$ok = ContentHandler::runLegacyHooks( 'testRunLegacyHooks', array( 'foo', &$content, 'bar' ), false );

		$this->assertTrue( $ok, "runLegacyHooks should have returned true" );
		$this->assertEquals( "TEST TEXT", $content->getNativeData() );
	}

	public static function dummyHookHandler( $foo, &$text, $bar ) {
		if ( $text === null || $text === false ) {
			return false;
		}

		$text = strtoupper( $text );

		return true;
	}
}

class DummyContentHandlerForTesting extends ContentHandler {

	public function __construct( $dataModel ) {
		parent::__construct( $dataModel, array( "testing" ) );
	}

	/**
	 * Serializes Content object of the type supported by this ContentHandler.
	 *
	 * @param Content $content the Content object to serialize
	 * @param null $format the desired serialization format
	 * @return String serialized form of the content
	 */
	public function serializeContent( Content $content, $format = null ) {
		return $content->serialize();
	}

	/**
	 * Unserializes a Content object of the type supported by this ContentHandler.
	 *
	 * @param $blob String serialized form of the content
	 * @param null $format the format used for serialization
	 * @return Content the Content object created by deserializing $blob
	 */
	public function unserializeContent( $blob, $format = null ) {
		$d = unserialize( $blob );
		return new DummyContentForTesting( $d );
	}

	/**
	 * Creates an empty Content object of the type supported by this ContentHandler.
	 *
	 */
	public function makeEmptyContent() {
		return new DummyContentForTesting( '' );
	}
}

class DummyContentForTesting extends AbstractContent {

	public function __construct( $data ) {
		parent::__construct( "testing" );

		$this->data = $data;
	}

	public function serialize( $format = null ) {
		return serialize( $this->data );
	}

	/**
	 * @return String a string representing the content in a way useful for building a full text search index.
	 *         If no useful representation exists, this method returns an empty string.
	 */
	public function getTextForSearchIndex() {
		return '';
	}

	/**
	 * @return String the wikitext to include when another page includes this  content, or false if the content is not
	 *  includable in a wikitext page.
	 */
	public function getWikitextForTransclusion() {
		return false;
	}

	/**
	 * Returns a textual representation of the content suitable for use in edit summaries and log messages.
	 *
	 * @param int $maxlength Maximum length of the summary text.
	 * @return string The summary text.
	 */
	public function getTextForSummary( $maxlength = 250 ) {
		return '';
	}

	/**
	 * Returns native represenation of the data. Interpretation depends on the data model used,
	 * as given by getDataModel().
	 *
	 * @return mixed the native representation of the content. Could be a string, a nested array
	 *  structure, an object, a binary blob... anything, really.
	 */
	public function getNativeData() {
		return $this->data;
	}

	/**
	 * returns the content's nominal size in bogo-bytes.
	 *
	 * @return int
	 */
	public function getSize() {
		return strlen( $this->data );
	}

	/**
	 * Return a copy of this Content object. The following must be true for the object returned
	 * if $copy = $original->copy()
	 *
	 * * get_class($original) === get_class($copy)
	 * * $original->getModel() === $copy->getModel()
	 * * $original->equals( $copy )
	 *
	 * If and only if the Content object is imutable, the copy() method can and should
	 * return $this. That is,  $copy === $original may be true, but only for imutable content
	 * objects.
	 *
	 * @return Content. A copy of this object.
	 */
	public function copy() {
		return $this;
	}

	/**
	 * Returns true if this content is countable as a "real" wiki page, provided
	 * that it's also in a countable location (e.g. a current revision in the main namespace).
	 *
	 * @param boolean $hasLinks if it is known whether this content contains links, provide this information here,
	 *  to avoid redundant parsing to find out.
	 * @return boolean
	 */
	public function isCountable( $hasLinks = null ) {
		return false;
	}

	/**
	 * @param Title $title
	 * @param null $revId
	 * @param null|ParserOptions $options
	 * @param boolean $generateHtml whether to generate Html (default: true). If false,
	 *  the result of calling getText() on the ParserOutput object returned by
	 *   this method is undefined.
	 *
	 * @return ParserOutput
	 */
	public function getParserOutput( Title $title, $revId = null, ParserOptions $options = null, $generateHtml = true ) {
		return new ParserOutput( $this->getNativeData() );
	}
}
