<?php
/**
 * Replace text in pages or page titles.
 *
 * Copyright © 2014 NicheWork, LLC
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * https://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @category Maintenance
 * @package  ReplaceText
 * @author   Mark A. Hershberger <mah@nichework.com>
 * @license  GPL-2.0-or-later
 * @link     https://www.mediawiki.org/wiki/Extension:Replace_Text
 *
 */
namespace MediaWiki\Extension\ReplaceText;

use MediaWiki\Maintenance\Maintenance;
use MediaWiki\User\User;
use MWException;

$IP = getenv( 'MW_INSTALL_PATH' ) ?: __DIR__ . '/../../..';
if ( !is_readable( "$IP/maintenance/Maintenance.php" ) ) {
	die( "MW_INSTALL_PATH needs to be set to your MediaWiki installation.\n" );
}
require_once "$IP/maintenance/Maintenance.php";

/**
 * Maintenance script that replaces text in pages
 *
 * @ingroup Maintenance
 * @SuppressWarnings(StaticAccess)
 * @SuppressWarnings(LongVariable)
 */
class ReplaceAll extends Maintenance {
	/** @var User */
	private $user;
	/** @var string[] */
	private $target;
	/** @var string[] */
	private $replacement;
	/** @var int[] */
	private $namespaces;
	/** @var string */
	private $category;
	/** @var string */
	private $prefix;
	/** @var int */
	private $pageLimit;
	/** @var bool[] */
	private $useRegex;
	/** @var bool */
	private $defaultContinue;
	/** @var bool */
	private $botEdit;
	/** @var bool */
	private $rename;

	public function __construct() {
		parent::__construct();
		$this->addDescription( 'CLI utility to replace text wherever it is ' .
			'found in the wiki.' );

		$this->addArg( 'target', 'Target text to find.', false );
		$this->addArg( 'replace', 'Text to replace.', false );

		$this->addOption( 'dry-run', 'Only find the texts, don\'t replace.',
			false, false, 'n' );
		$this->addOption( 'regex', 'This is a regex (false).',
			false, false, 'r' );
		$this->addOption( 'user', 'The user to attribute this to (uid 1).',
			false, true, 'u' );
		$this->addOption( 'yes', 'Skip all prompts with an assumed \'yes\'.',
			false, false, 'y' );
		$this->addOption( 'summary', 'Alternate edit summary. (%r is where to ' .
			' place the replacement text, %f the text to look for.)',
			false, true, 's' );
		$this->addOption( 'nsall', 'Search all canonical namespaces (false). ' .
			'If true, this option overrides the ns option.', false, false, 'a' );
		$this->addOption( 'ns', 'Comma separated namespaces to search in ' .
			'(Main) .', false, true );
		$this->addOption( 'category', 'Search only pages within this category.',
			false, true, 'c' );
		$this->addOption( 'prefix', 'Search only pages whose names start with this string.',
			false, true, 'p' );
		$this->addOption( 'pageLimit', 'Maximum number of pages to return from the search.',
			false, true, 'p' );
		$this->addOption( 'replacements', 'File containing the list of ' .
			'replacements to be made.  Fields in the file are tab-separated. ' .
			'See --show-file-format for more information.', false, true, 'f' );
		$this->addOption( 'show-file-format', 'Show a description of the ' .
			'file format to use with --replacements.', false, false );
		$this->addOption( 'bot-edit', 'Mark changes as bot edits.',
			false, false, 'b' );
		$this->addOption( 'debug', 'Display replacements being made.', false, false );
		$this->addOption( 'listns', 'List out the namespaces on this wiki.',
			false, false );
		$this->addOption( 'rename', 'Rename page titles instead of replacing contents.',
			false, false );

		$this->requireExtension( 'Replace Text' );
	}

	private function getUser() {
		$userReplacing = $this->getOption( 'user', 1 );

		$userFactory = $this->getServiceContainer()->getUserFactory();
		$user = is_numeric( $userReplacing ) ?
			$userFactory->newFromId( $userReplacing ) :
			$userFactory->newFromName( $userReplacing );

		if ( !$user instanceof User ) {
			$this->fatalError(
				"Couldn't translate '$userReplacing' to a user."
			);
		}

		return $user;
	}

	private function getTarget() {
		$ret = $this->getArg( 0 );
		if ( $ret === null ) {
			$this->fatalError( 'You have to specify a target.' );
		}
		return [ $ret ];
	}

	private function getReplacement() {
		$ret = $this->getArg( 1 );
		if ( $ret === null ) {
			$this->fatalError( 'You have to specify replacement text.' );
		}
		return [ $ret ];
	}

	private function getReplacements() {
		$file = $this->getOption( 'replacements' );
		if ( !$file ) {
			return false;
		}

		if ( !is_readable( $file ) ) {
			throw new MWException( 'File does not exist or is not readable: '
				. "$file\n" );
		}

		$handle = fopen( $file, 'r' );
		if ( $handle === false ) {
			throw new MWException( "Trouble opening file: $file\n" );
		}

		$this->defaultContinue = true;
		// phpcs:ignore Generic.CodeAnalysis.AssignmentInCondition.FoundInWhileCondition
		while ( ( $line = fgets( $handle ) ) !== false ) {
			$field = explode( "\t", substr( $line, 0, -1 ) );
			if ( !isset( $field[1] ) ) {
				continue;
			}

			$this->target[] = $field[0];
			$this->replacement[] = $field[1];
			$this->useRegex[] = isset( $field[2] );
		}
		return true;
	}

	private function shouldContinueByDefault() {
		if ( !is_bool( $this->defaultContinue ) ) {
			$this->defaultContinue =
				$this->getOption( 'yes' ) ?
				true :
				false;
		}
		return $this->defaultContinue;
	}

	private function getSummary( $target, $replacement ) {
		$msg = wfMessage( 'replacetext_editsummary', $target, $replacement )->
			plain();
		if ( $this->getOption( 'summary' ) !== null ) {
			$msg = str_replace( [ '%f', '%r' ],
				[ $target, $replacement ],
				$this->getOption( 'summary' ) );
		}
		return $msg;
	}

	private function listNamespaces() {
		$this->output( "Index\tNamespace\n" );
		$nsList = $this->getServiceContainer()->getNamespaceInfo()->getCanonicalNamespaces();
		ksort( $nsList );
		foreach ( $nsList as $int => $val ) {
			if ( $val == '' ) {
				$val = '(main)';
			}
			$this->output( " $int\t$val\n" );
		}
	}

	private function showFileFormat() {
		$text = <<<EOF

The format of the replacements file is tab separated with three fields.
Any line that does not have a tab is ignored and can be considered a comment.

Fields are:

 1. String to search for.
 2. String to replace found text with.
 3. (optional) The presence of this field indicates that the previous two
	are considered a regular expression.

Example:

This is a comment
TARGET	REPLACE
regex(p*)	Count the Ps; \\1	true


EOF;
		$this->output( $text );
	}

	private function getNamespaces() {
		$nsall = $this->getOption( 'nsall' );
		$ns = $this->getOption( 'ns' );
		if ( !$nsall && !$ns ) {
			$namespaces = [ NS_MAIN ];
		} else {
			$canonical = $this->getServiceContainer()->getNamespaceInfo()->getCanonicalNamespaces();
			$canonical[NS_MAIN] = '_';
			$namespaces = array_flip( $canonical );
			if ( !$nsall ) {
				$namespaces = array_map(
					static function ( $n ) use ( $canonical, $namespaces ) {
						if ( is_numeric( $n ) ) {
							if ( isset( $canonical[ $n ] ) ) {
								return intval( $n );
							}
						} else {
							if ( isset( $namespaces[ $n ] ) ) {
								return $namespaces[ $n ];
							}
						}
						return null;
					}, explode( ',', $ns ) );
				$namespaces = array_filter(
					$namespaces,
					static function ( $val ) {
						return $val !== null;
					} );
			}
		}
		return $namespaces;
	}

	private function getCategory() {
		return $this->getOption( 'category' );
	}

	private function getPrefix() {
		return $this->getOption( 'prefix' );
	}

	private function getPageLimit() {
		return $this->getOption( 'pageLimit' );
	}

	private function useRegex() {
		return [ $this->getOption( 'regex' ) ];
	}

	private function getRename() {
		return $this->hasOption( 'rename' );
	}

	private function listTitles( $titles, $target, $replacement, $regex, $rename ) {
		$skippedTitles = [];
		foreach ( $titles as $prefixedText => $title ) {
			if ( $title === null ) {
				$skippedTitles[] = $prefixedText;
				continue;
			}

			if ( $rename ) {
				$newTitle = Search::getReplacedTitle( $title, $target, $replacement, $regex );
				// Implicit conversion of objects to strings
				$this->output( "$title\t->\t$newTitle\n" );
			} else {
				$this->output( "$title\n" );
			}
		}

		if ( $skippedTitles ) {
			$this->output( "\nExtension hook filtered out the following titles from being moved:\n" );
			foreach ( $skippedTitles as $prefixedTitle ) {
				$this->output( "$prefixedTitle\n" );
			}
		}
	}

	private function replaceTitles( $titles, $target, $replacement, $useRegex, $rename ) {
		foreach ( $titles as $title ) {
			$params = [
				'target_str'      => $target,
				'replacement_str' => $replacement,
				'use_regex'       => $useRegex,
				'user_id'         => $this->user->getId(),
				'edit_summary'    => $this->getSummary( $target, $replacement ),
				'botEdit'         => $this->botEdit
			];

			if ( $rename ) {
				$params[ 'move_page' ] = true;
				$params[ 'create_redirect' ] = false;
				$params[ 'watch_page' ] = false;
			}

			$this->output( "Replacing on $title... " );
			$services = $this->getServiceContainer();
			$job = new Job( $title, $params,
				$services->getMovePageFactory(),
				$services->getPermissionManager(),
				$services->getUserFactory(),
				$services->getWatchlistManager(),
				$services->getWikiPageFactory()
			);
			if ( $job->run() !== true ) {
				$this->error( "Trouble on the page '$title'." );
			}
			$this->output( "done.\n" );
		}
	}

	private function getReply( $question ) {
		$reply = '';
		if ( $this->shouldContinueByDefault() ) {
			return true;
		}
		while ( $reply !== 'y' && $reply !== 'n' ) {
			$reply = $this->readconsole( "$question (Y/N) " );
			$reply = substr( strtolower( $reply ), 0, 1 );
		}
		return $reply === 'y';
	}

	private function localSetup() {
		if ( $this->getOption( 'listns' ) ) {
			$this->listNamespaces();
			return false;
		}
		if ( $this->getOption( 'show-file-format' ) ) {
			$this->showFileFormat();
			return false;
		}
		$this->user = $this->getUser();
		if ( !$this->getReplacements() ) {
			$this->target = $this->getTarget();
			$this->replacement = $this->getReplacement();
			$this->useRegex = $this->useRegex();
		}
		$this->namespaces = $this->getNamespaces();
		$this->category = $this->getCategory();
		$this->prefix = $this->getPrefix();
		$this->pageLimit = $this->getPageLimit();
		$this->rename = $this->getRename();

		return true;
	}

	/**
	 * @inheritDoc
	 */
	public function execute() {
		$this->botEdit = false;
		if ( !$this->localSetup() ) {
			return;
		}

		if ( $this->namespaces === [] ) {
			$this->fatalError( 'No matching namespaces.' );
		}

		$services = $this->getServiceContainer();
		$hookHelper = new HookHelper( $services->getHookContainer() );
		$search = new Search(
			$services->getMainConfig(),
			$services->getDBLoadBalancerFactory()
		);
		foreach ( $this->target as $index => $target ) {
			$replacement = $this->replacement[$index];
			$useRegex = $this->useRegex[$index];

			if ( $this->getOption( 'debug' ) ) {
				$this->output( "Replacing '$target' with '$replacement'" );
				if ( $useRegex ) {
					$this->output( ' as regular expression' );
				}
				$this->output( ".\n" );
			}

			if ( $this->rename ) {
				$res = $search->getMatchingTitles(
					$target,
					$this->namespaces,
					$this->category,
					$this->prefix,
					$this->pageLimit,
					$useRegex
				);
				$titlesToProcess = $hookHelper->filterPageTitlesForRename( $res );
			} else {
				$res = $search->doSearchQuery(
					$target,
					$this->namespaces,
					$this->category,
					$this->prefix,
					$this->pageLimit,
					$useRegex
				);
				$titlesToProcess = $hookHelper->filterPageTitlesForEdit( $res );
			}

			if ( count( $titlesToProcess ) === 0 ) {
				$this->fatalError( 'No targets found to replace.' );
			}

			if ( $this->getOption( 'dry-run' ) ) {
				$this->listTitles( $titlesToProcess, $target, $replacement, $useRegex, $this->rename );
				continue;
			}

			if ( !$this->shouldContinueByDefault() ) {
				$this->listTitles( $titlesToProcess, $target, $replacement, $useRegex, $this->rename );
				if ( !$this->getReply( 'Replace instances on these pages?' ) ) {
					return;
				}
			}

			$comment = '';
			if ( $this->getOption( 'user', null ) === null ) {
				$comment = ' (Use --user to override)';
			}
			if ( $this->getOption( 'bot-edit', false ) ) {
				$this->botEdit = true;
			}
			if ( !$this->getReply(
				"Attribute changes to the user '{$this->user->getName()}'?$comment"
			) ) {
				return;
			}

			$this->replaceTitles( $titlesToProcess, $target, $replacement, $useRegex, $this->rename );
		}
	}
}

$maintClass = ReplaceAll::class;
require_once RUN_MAINTENANCE_IF_MAIN;
