<?php
/**
 *
 * @file
 * @ingroup Extensions
 * @link		http://www.mediawiki.org/wiki/Extension:DynamicPageList3 Documentation
 * @author		n:en:User:IlyaHaykinson
 * @author		n:en:User:Amgine
 * @author		w:de:Benutzer:Unendlich
 * @author		m:User:Dangerman <cyril.dangerville@gmail.com>
 * @author		m:User:Algorithmix <gero.scholz@gmx.de>
 * @license		GPL-2.0-or-later
 *
 */

class DynamicPageListHooks {
	// FATAL
	const FATAL_WRONGNS = 1001;	// $1: 'namespace' or 'notnamespace'
															// $2: wrong parameter given by user
															// $3: list of possible titles of namespaces (except pseudo-namespaces: Media, Special)

	const FATAL_WRONGLINKSTO = 1002;	// $1: linksto'
															// $2: the wrong parameter given by user

	const FATAL_TOOMANYCATS = 1003;	// $1: max number of categories that can be included

	const FATAL_TOOFEWCATS = 1004;	// $1: min number of categories that have to be included

	const FATAL_NOSELECTION = 1005;

	const FATAL_CATDATEBUTNOINCLUDEDCATS = 1006;

	const FATAL_CATDATEBUTMORETHAN1CAT = 1007;

	const FATAL_MORETHAN1TYPEOFDATE = 1008;

	const FATAL_WRONGORDERMETHOD = 1009;	// $1: param=val that is possible only with $1 as last 'ordermethod' parameter
															// $2: last 'ordermethod' parameter required for $0

	const FATAL_DOMINANTSECTIONRANGE = 1010;	// $1: the number of arguments in includepage

	const FATAL_OPENREFERENCES = 1012;

	const FATAL_MISSINGPARAMFUNCTION = 1022;

	const FATAL_NOTPROTECTED = 1023;

	const FATAL_SQLBUILDERROR = 1024;

	// ERROR

	// WARN

	const WARN_UNKNOWNPARAM = 2013;	// $1: unknown parameter given by user
															// $2: list of DPL available parameters separated by ', '

	const WARN_PARAMNOOPTION = 2022;	// $1: Parameter given by user

	const WARN_WRONGPARAM = 2014;	// $3: list of valid param values separated by ' | '

	const WARN_WRONGPARAM_INT = 2015;	// $1: param name
															// $2: wrong param value given by user
															// $3: default param value used instead by program

	const WARN_NORESULTS = 2016;

	const WARN_CATOUTPUTBUTWRONGPARAMS = 2017;

	const WARN_HEADINGBUTSIMPLEORDERMETHOD = 2018;	// $1: 'headingmode' value given by user
															// $2: value used instead by program (which means no heading)

	const WARN_DEBUGPARAMNOTFIRST = 2019;	// $1: 'log' value

	const WARN_TRANSCLUSIONLOOP = 2020;	// $1: title of page that creates an infinite transclusion loop

	// INFO

	// DEBUG

	const DEBUG_QUERY = 3021;	// $1: SQL query executed to generate the dynamic page list

	// TRACE
															// Output formatting
															// $1: number of articles

	static public $fixedCategories = [];

	public static $createdLinks; // the links created by DPL are collected here;
								 // they can be removed during the final ouput
								 // phase of the MediaWiki parser

	/**
	 * DPL acting like Extension:Intersection
	 *
	 * @var		boolean
	 */
	static private $likeIntersection = false;

	/**
	 * Debugging Level
	 *
	 * @var		integer
	 */
	static private $debugLevel = 0;

	/**
	 * Handle special on extension registration bits.
	 *
	 * @access	public
	 * @return	void
	 */
	public static function onRegistration() {
		if (!defined('DPL_VERSION')) {
			define('DPL_VERSION', '3.3.4');
		}
	}

	/**
	 * Sets up this extension's parser functions.
	 *
	 * @access	public
	 * @param	object	Parser object passed as a reference.
	 * @return	boolean	true
	 */
	public static function onParserFirstCallInit(Parser &$parser) {
		self::init();

		//DPL offers the same functionality as Intersection.  So we register the <DynamicPageList> tag in case LabeledSection Extension is not installed so that the section markers are removed.
		if (\DPL\Config::getSetting('handleSectionTag')) {
			$parser->setHook('section', [__CLASS__, 'dplTag']);
		}
		$parser->setHook('DPL', [__CLASS__, 'dplTag']);
		$parser->setHook('DynamicPageList', [__CLASS__, 'intersectionTag']);

		$parser->setFunctionHook('dpl', [__CLASS__, 'dplParserFunction']);
		$parser->setFunctionHook('dplnum', [__CLASS__, 'dplNumParserFunction']);
		$parser->setFunctionHook('dplvar', [__CLASS__, 'dplVarParserFunction']);
		$parser->setFunctionHook('dplreplace', [__CLASS__, 'dplReplaceParserFunction']);
		$parser->setFunctionHook('dplchapter', [__CLASS__, 'dplChapterParserFunction']);
		$parser->setFunctionHook('dplmatrix', [__CLASS__, 'dplMatrixParserFunction']);

		return true;
	}

	/**
	 * Sets up this extension's parser functions for migration from Intersection.
	 *
	 * @access	public
	 * @param	object	Parser object passed as a reference.
	 * @return	boolean	true
	 */
	public static function setupMigration(Parser &$parser) {
		$parser->setHook('Intersection', [__CLASS__, 'intersectionTag']);
		$parser->addTrackingCategory('dpl-intersection-tracking-category');

		self::init();

		return true;
	}

	/**
	 * Common initializer for usage from parser entry points.
	 *
	 * @access	private
	 * @return	void
	 */
	private static function init() {
		\DPL\Config::init();

		if (!isset(self::$createdLinks)) {
			self::$createdLinks = [
				'resetLinks' => false,
				'resetTemplates' => false,
				'resetCategories' => false,
				'resetImages' => false,
				'resetdone' => false,
				'elimdone' => false
			];
		}
	}

	/**
	 * Set to behave like intersection.
	 *
	 * @access	private
	 * @param	boolean	Behave Like Intersection
	 * @return	void
	 */
	private static function setLikeIntersection($mode = false) {
		self::$likeIntersection = $mode;
	}

	/**
	 * Is like intersection?
	 *
	 * @access	public
	 * @return	boolean	Behaving Like Intersection
	 */
	public static function isLikeIntersection() {
		return (bool)self::$likeIntersection;
	}

	/**
	 * Tag <section> entry point.
	 *
	 * @access	public
	 * @param	string	Raw User Input
	 * @param	array	Arguments on the tag.
	 * @param	object	Parser object.
	 * @param	object	PPFrame object.
	 * @return	string	HTML
	 */
	public static function intersectionTag($input, array $args, Parser $parser, PPFrame $frame) {
		self::setLikeIntersection(true);
		return self::executeTag($input, $args, $parser, $frame);
	}

	/**
	 * Tag <dpl> entry point.
	 *
	 * @access	public
	 * @param	string	Raw User Input
	 * @param	array	Arguments on the tag.
	 * @param	object	Parser object.
	 * @param	object	PPFrame object.
	 * @return	string	HTML
	 */
	public static function dplTag($input, array $args, Parser $parser, PPFrame $frame) {
		self::setLikeIntersection(false);
		$parser->addTrackingCategory('dpl-tag-tracking-category');
		return self::executeTag($input, $args, $parser, $frame);
	}

	/**
	 * The callback function wrapper for converting the input text to HTML output
	 *
	 * @access	public
	 * @param	string	Raw User Input
	 * @param	array	Arguments on the tag.(While not used, it is left here for future compatibility.)
	 * @param	object	Parser object.
	 * @param	object	PPFrame object.
	 * @return	string	HTML
	 */
	private static function executeTag($input, array $args, Parser $parser, PPFrame $frame) {
		// entry point for user tag <dpl>  or  <DynamicPageList>
		// create list and do a recursive parse of the output

		$parse = new \DPL\Parse();
		if (\DPL\Config::getSetting('recursiveTagParse')) {
			$input = $parser->recursiveTagParse($input, $frame);
		}
		$text = $parse->parse($input, $parser, $reset, $eliminate, true);

		if (isset($reset['templates']) && $reset['templates']) {	// we can remove the templates by save/restore
			$saveTemplates = $parser->mOutput->mTemplates;
		}
		if (isset($reset['categories']) && $reset['categories']) {	// we can remove the categories by save/restore
			$saveCategories = $parser->mOutput->mCategories;
		}
		if (isset($reset['images']) && $reset['images']) {	// we can remove the images by save/restore
			$saveImages = $parser->mOutput->mImages;
		}
		$parsedDPL = $parser->recursiveTagParse($text);
		if (isset($reset['templates']) && $reset['templates']) {
			$parser->mOutput->mTemplates = $saveTemplates;
		}
		if (isset($reset['categories']) && $reset['categories']) {
			$parser->mOutput->mCategories = $saveCategories;
		}
		if (isset($reset['images']) && $reset['images']) {
			$parser->mOutput->mImages = $saveImages;
		}

		return $parsedDPL;
	}

	/**
	 * The #dpl parser tag entry point.
	 *
	 * @access	public
	 * @param	object	Parser object passed as a reference.
	 * @return	string	Wiki Text
	 */
	public static function dplParserFunction(&$parser) {
		self::setLikeIntersection(false);

		$parser->addTrackingCategory('dpl-parserfunc-tracking-category');

		// callback for the parser function {{#dpl:	  or   {{DynamicPageList::
		$input = "";

		$numargs = func_num_args();
		if ($numargs < 2) {
			$input = "#dpl: no arguments specified";
			return str_replace('§', '<', '§pre>§nowiki>' . $input . '§/nowiki>§/pre>');
		}

		// fetch all user-provided arguments (skipping $parser)
		$arg_list = func_get_args();
		for ($i = 1; $i < $numargs; $i++) {
			$p1 = $arg_list[$i];
			$input .= str_replace("\n", "", $p1) . "\n";
		}

		$parse = new \DPL\Parse();
		$dplresult = $parse->parse($input, $parser, $reset, $eliminate, false);
		return [ // parser needs to be coaxed to do further recursive processing
			$parser->getPreprocessor()->preprocessToObj($dplresult, Parser::PTD_FOR_INCLUSION),
			'isLocalObj' => true,
			'title' => $parser->getTitle()
		];
	}

	/**
	 * The #dplnum parser tag entry point.
	 * From the old documentation: "Tries to guess a number that is buried in the text.  Uses a set of heuristic rules which may work or not.  The idea is to extract the number so that it can be used as a sorting value in the column of a DPL table output."
	 *
	 * @access	public
	 * @param	object	Parser object passed as a reference.
	 * @return	string	Wiki Text
	 */
	public static function dplNumParserFunction(&$parser, $text = '') {
		$parser->addTrackingCategory('dplnum-parserfunc-tracking-category');
		$num = str_replace('&#160;', ' ', $text);
		$num = str_replace('&nbsp;', ' ', $text);
		$num = preg_replace('/([0-9])([.])([0-9][0-9]?[^0-9,])/', '\1,\3', $num);
		$num = preg_replace('/([0-9.]+),([0-9][0-9][0-9])\s*Mrd/', '\1\2 000000 ', $num);
		$num = preg_replace('/([0-9.]+),([0-9][0-9])\s*Mrd/', '\1\2 0000000 ', $num);
		$num = preg_replace('/([0-9.]+),([0-9])\s*Mrd/', '\1\2 00000000 ', $num);
		$num = preg_replace('/\s*Mrd/', '000000000 ', $num);
		$num = preg_replace('/([0-9.]+),([0-9][0-9][0-9])\s*Mio/', '\1\2 000 ', $num);
		$num = preg_replace('/([0-9.]+),([0-9][0-9])\s*Mio/', '\1\2 0000 ', $num);
		$num = preg_replace('/([0-9.]+),([0-9])\s*Mio/', '\1\2 00000 ', $num);
		$num = preg_replace('/\s*Mio/', '000000 ', $num);
		$num = preg_replace('/[. ]/', '', $num);
		$num = preg_replace('/^[^0-9]+/', '', $num);
		$num = preg_replace('/[^0-9].*/', '', $num);
		return $num;
	}

	public static function dplVarParserFunction(&$parser, $cmd) {
		$parser->addTrackingCategory('dplvar-parserfunc-tracking-category');
		$args = func_get_args();
		if ($cmd == 'set') {
			return \DPL\Variables::setVar($args);
		} elseif ($cmd == 'default') {
			return \DPL\Variables::setVarDefault($args);
		}
		return \DPL\Variables::getVar($cmd);
	}

	private static function isRegexp($needle) {
		if (strlen($needle) < 3) {
			return false;
		}
		if (ctype_alnum($needle[0])) {
			return false;
		}
		$nettoNeedle = preg_replace('/[ismu]*$/', '', $needle);
		if (strlen($nettoNeedle) < 2) {
			return false;
		}
		if ($needle[0] == $nettoNeedle[strlen($nettoNeedle) - 1]) {
			return true;
		}
		return false;
	}

	public static function dplReplaceParserFunction(&$parser, $text, $pat = '', $repl = '') {
		$parser->addTrackingCategory('dplreplace-parserfunc-tracking-category');
		if ($text == '' || $pat == '') {
			return '';
		}
		# convert \n to a real newline character
		$repl = str_replace('\n', "\n", $repl);

		# replace
		if (!self::isRegexp($pat)) {
			$pat = '`' . str_replace('`', '\`', $pat) . '`';
		}

		return @preg_replace($pat, $repl, $text);
	}

	public static function dplChapterParserFunction(&$parser, $text = '', $heading = ' ', $maxLength = -1, $page = '?page?', $link = 'default', $trim = false) {
		$parser->addTrackingCategory('dplchapter-parserfunc-tracking-category');
		$output = \DPL\LST::extractHeadingFromText($parser, $page, '?title?', $text, $heading, '', $sectionHeading, true, $maxLength, $link, $trim);
		return $output[0];
	}

	public static function dplMatrixParserFunction(&$parser, $name = '', $yes = '', $no = '', $flip = '', $matrix = '') {
		$parser->addTrackingCategory('dplmatrix-parserfunc-tracking-category');
		$lines   = explode("\n", $matrix);
		$m       = [];
		$sources = [];
		$targets = [];
		$from    = '';
		$to      = '';
		if ($flip == '' | $flip == 'normal') {
			$flip = false;
		} else {
			$flip = true;
		}
		if ($name == '') {
			$name = '&#160;';
		}
		if ($yes == '') {
			$yes = ' x ';
		}
		if ($no == '') {
			$no = '&#160;';
		}
		if ($no[0] == '-') {
			$no = " $no ";
		}
		foreach ($lines as $line) {
			if (strlen($line) <= 0) {
				continue;
			}
			if ($line[0] != ' ') {
				$from = preg_split(' *\~\~ *', trim($line), 2);
				if (!array_key_exists($from[0], $sources)) {
					if (count($from) < 2 || $from[1] == '') {
						$sources[$from[0]] = $from[0];
					} else {
						$sources[$from[0]] = $from[1];
					}
					$m[$from[0]] = [];
				}
			} elseif (trim($line) != '') {
				$to = preg_split(' *\~\~ *', trim($line), 2);
				if (count($to) < 2 || $to[1] == '') {
					$targets[$to[0]] = $to[0];
				} else {
					$targets[$to[0]] = $to[1];
				}
				$m[$from[0]][$to[0]] = true;
			}
		}
		ksort($targets);

		$header = "\n";

		if ($flip) {
			foreach ($sources as $from => $fromName) {
				$header .= "![[$from|" . $fromName . "]]\n";
			}
			foreach ($targets as $to => $toName) {
				$targets[$to] = "[[$to|$toName]]";
				foreach ($sources as $from => $fromName) {
					if (array_key_exists($to, $m[$from])) {
						$targets[$to] .= "\n|$yes";
					} else {
						$targets[$to] .= "\n|$no";
					}
				}
				$targets[$to] .= "\n|--\n";
			}
			return "{|class=dplmatrix\n|$name" . "\n" . $header . "|--\n!" . implode("\n!", $targets) . "\n|}";
		} else {
			foreach ($targets as $to => $toName) {
				$header .= "![[$to|" . $toName . "]]\n";
			}
			foreach ($sources as $from => $fromName) {
				$sources[$from] = "[[$from|$fromName]]";
				foreach ($targets as $to => $toName) {
					if (array_key_exists($to, $m[$from])) {
						$sources[$from] .= "\n|$yes";
					} else {
						$sources[$from] .= "\n|$no";
					}
				}
				$sources[$from] .= "\n|--\n";
			}
			return "{|class=dplmatrix\n|$name" . "\n" . $header . "|--\n!" . implode("\n!", $sources) . "\n|}";
		}
	}

	private static function dumpParsedRefs($parser, $label) {
		//if (!preg_match("/Query Q/",$parser->mTitle->getText())) return '';
		echo '<pre>parser mLinks: ';
		ob_start();
		var_dump($parser->mOutput->mLinks);
		$a = ob_get_contents();
		ob_end_clean();
		echo htmlspecialchars($a, ENT_QUOTES);
		echo '</pre>';
		echo '<pre>parser mTemplates: ';
		ob_start();
		var_dump($parser->mOutput->mTemplates);
		$a = ob_get_contents();
		ob_end_clean();
		echo htmlspecialchars($a, ENT_QUOTES);
		echo '</pre>';
	}

	//remove section markers in case the LabeledSectionTransclusion extension is not installed.
	public static function removeSectionMarkers($in, $assocArgs = [], $parser = null) {
		return '';
	}

	public static function fixCategory($cat) {
		if ($cat != '') {
			self::$fixedCategories[$cat] = 1;
		}
	}

	/**
	 * Set Debugging Level
	 *
	 * @access	public
	 * @param	integer	Debug Level
	 * @return	void
	 */
	public static function setDebugLevel($level) {
		self::$debugLevel = intval($level);
	}

	/**
	 * Return Debugging Level
	 *
	 * @access	public
	 * @return	void
	 */
	public static function getDebugLevel() {
		return self::$debugLevel;
	}

	// reset everything; some categories may have been fixed, however via  fixcategory=
	public static function endReset(&$parser, $text) {
		if (!self::$createdLinks['resetdone']) {
			self::$createdLinks['resetdone'] = true;
			foreach ($parser->mOutput->mCategories as $key => $val) {
				if (array_key_exists($key, self::$fixedCategories)) {
					self::$fixedCategories[$key] = $val;
				}
			}
			// $text .= self::dumpParsedRefs($parser,"before final reset");
			if (self::$createdLinks['resetLinks']) {
				$parser->mOutput->mLinks = [];
			}
			if (self::$createdLinks['resetCategories']) {
				$parser->mOutput->mCategories = self::$fixedCategories;
			}
			if (self::$createdLinks['resetTemplates']) {
				$parser->mOutput->mTemplates = [];
			}
			if (self::$createdLinks['resetImages']) {
				$parser->mOutput->mImages = [];
			}
			// $text .= self::dumpParsedRefs($parser,"after final reset");
			self::$fixedCategories = [];
		}
		return true;
	}

	public static function endEliminate(&$parser, &$text) {
		// called during the final output phase; removes links created by DPL
		if (isset(self::$createdLinks)) {
			// self::dumpParsedRefs($parser,"before final eliminate");
			if (array_key_exists(0, self::$createdLinks)) {
				foreach ($parser->mOutput->getLinks() as $nsp => $link) {
					if (!array_key_exists($nsp, self::$createdLinks[0])) {
						continue;
					}
					// echo ("<pre> elim: created Links [$nsp] = ". count(DynamicPageListHooks::$createdLinks[0][$nsp])."</pre>\n");
					// echo ("<pre> elim: parser  Links [$nsp] = ". count($parser->mOutput->mLinks[$nsp])			 ."</pre>\n");
					$parser->mOutput->mLinks[$nsp] = array_diff_assoc($parser->mOutput->mLinks[$nsp], self::$createdLinks[0][$nsp]);
					// echo ("<pre> elim: parser  Links [$nsp] nachher = ". count($parser->mOutput->mLinks[$nsp])	  ."</pre>\n");
					if (count($parser->mOutput->mLinks[$nsp]) == 0) {
						unset($parser->mOutput->mLinks[$nsp]);
					}
				}
			}
			if (isset(self::$createdLinks) && array_key_exists(1, self::$createdLinks)) {
				foreach ($parser->mOutput->mTemplates as $nsp => $tpl) {
					if (!array_key_exists($nsp, self::$createdLinks[1])) {
						continue;
					}
					// echo ("<pre> elim: created Tpls [$nsp] = ". count(DynamicPageListHooks::$createdLinks[1][$nsp])."</pre>\n");
					// echo ("<pre> elim: parser  Tpls [$nsp] = ". count($parser->mOutput->mTemplates[$nsp])			."</pre>\n");
					$parser->mOutput->mTemplates[$nsp] = array_diff_assoc($parser->mOutput->mTemplates[$nsp], self::$createdLinks[1][$nsp]);
					// echo ("<pre> elim: parser  Tpls [$nsp] nachher = ". count($parser->mOutput->mTemplates[$nsp])	 ."</pre>\n");
					if (count($parser->mOutput->mTemplates[$nsp]) == 0) {
						unset($parser->mOutput->mTemplates[$nsp]);
					}
				}
			}
			if (isset(self::$createdLinks) && array_key_exists(2, self::$createdLinks)) {
				$parser->mOutput->mCategories = array_diff_assoc($parser->mOutput->mCategories, self::$createdLinks[2]);
			}
			if (isset(self::$createdLinks) && array_key_exists(3, self::$createdLinks)) {
				$parser->mOutput->mImages = array_diff_assoc($parser->mOutput->mImages, self::$createdLinks[3]);
			}
			// $text .= self::dumpParsedRefs($parser,"after final eliminate".$parser->mTitle->getText());
		}

		//self::$createdLinks=array(
		//		  'resetLinks'=> false, 'resetTemplates' => false,
		//		  'resetCategories' => false, 'resetImages' => false, 'resetdone' => false );
		return true;
	}

	/**
	 * Setups and Modifies Database Information
	 *
	 * @access	public
	 * @param	DatabaseUpdater $updater
	 */
	public static function onLoadExtensionSchemaUpdates(DatabaseUpdater $updater) {
		$extDir = __DIR__;

		$updater->addPostDatabaseUpdateMaintenance('DPL\\DB\\CreateTemplateUpdateMaintenance');

		$db = $updater->getDB();
		if (!$db->tableExists('dpl_clview')) {
			// PostgreSQL doesn't have IFNULL, so use COALESCE instead
			$sqlNullMethod = ($db->getType() === 'postgres' ? 'COALESCE' : 'IFNULL');
			$db->query("CREATE VIEW {$db->tablePrefix()}dpl_clview AS SELECT $sqlNullMethod(cl_from, page_id) AS cl_from, $sqlNullMethod(cl_to, '') AS cl_to, cl_sortkey FROM {$db->tablePrefix()}page LEFT OUTER JOIN {$db->tablePrefix()}categorylinks ON {$db->tablePrefix()}page.page_id=cl_from;");
		}
	}
}