<?php
/**
 *
 * @addtogroup SpecialPage
 */

/**
 * Constructor
 */
function wfSpecialMovepage( $par = null ) {
	global $wgUser, $wgOut, $wgRequest, $action;

	# Check rights
	if ( !$wgUser->isAllowed( 'move' ) ) {
		$wgOut->showPermissionsErrorPage( array( $wgUser->isAnon() ? 'movenologintext' : 'movenotallowed' ) );
		return;
	}

	# Don't allow blocked users to move pages
	if ( $wgUser->isBlocked() ) {
		$wgOut->blockedPage();
		return;
	}

	# Check for database lock
	if ( wfReadOnly() ) {
		$wgOut->readOnlyPage();
		return;
	}

	$f = new MovePageForm( $par );

	if ( 'success' == $action ) {
		$f->showSuccess();
	} else if ( 'submit' == $action && $wgRequest->wasPosted()
		&& $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) ) ) {
		$f->doSubmit();
	} else {
		$f->showForm( '' );
	}
}

/**
 * HTML form for Special:Movepage
 * @addtogroup SpecialPage
 */
class MovePageForm {
	var $oldTitle, $newTitle, $reason; # Text input
	var $moveTalk, $deleteAndMove;
	
	private $watch = false;

	function MovePageForm( $par ) {
		global $wgRequest;
		$target = isset($par) ? $par : $wgRequest->getVal( 'target' );
		$this->oldTitle = $wgRequest->getText( 'wpOldTitle', $target );
		$this->newTitle = $wgRequest->getText( 'wpNewTitle' );
		$this->reason = $wgRequest->getText( 'wpReason' );
		if ( $wgRequest->wasPosted() ) {
			$this->moveTalk = $wgRequest->getBool( 'wpMovetalk', false );
		} else {
			$this->moveTalk = $wgRequest->getBool( 'wpMovetalk', true );
		}
		$this->deleteAndMove = $wgRequest->getBool( 'wpDeleteAndMove' ) && $wgRequest->getBool( 'wpConfirm' );
		$this->watch = $wgRequest->getCheck( 'wpWatch' );
	}

	function showForm( $err ) {
		global $wgOut, $wgUser, $wgContLang;
		
		$start = $wgContLang->isRTL() ? 'right' : 'left';
		$end = $wgContLang->isRTL() ? 'left' : 'right';

		$wgOut->setPagetitle( wfMsg( 'movepage' ) );

		$ot = Title::newFromURL( $this->oldTitle );
		if( is_null( $ot ) ) {
			$wgOut->showErrorPage( 'notargettitle', 'notargettext' );
			return;
		}
		$oldTitle = $ot->getPrefixedText();

		$encOldTitle = htmlspecialchars( $oldTitle );
		if( $this->newTitle == '' ) {
			# Show the current title as a default
			# when the form is first opened.
			$encNewTitle = $encOldTitle;
		} else {
			if( $err == '' ) {
				$nt = Title::newFromURL( $this->newTitle );
				if( $nt ) {
					# If a title was supplied, probably from the move log revert
					# link, check for validity. We can then show some diagnostic
					# information and save a click.
					$newerr = $ot->isValidMoveOperation( $nt );
					if( is_string( $newerr ) ) {
						$err = $newerr;
					}
				}
			}
			$encNewTitle = htmlspecialchars( $this->newTitle );
		}
		$encReason = htmlspecialchars( $this->reason );

		if ( $err == 'articleexists' && $wgUser->isAllowed( 'delete' ) ) {
			$wgOut->addWikiText( wfMsg( 'delete_and_move_text', $encNewTitle ) );
			$movepagebtn = wfMsgHtml( 'delete_and_move' );
			$submitVar = 'wpDeleteAndMove';
			$confirm = "
				<tr>
					<td></td><td>" . Xml::checkLabel( wfMsg( 'delete_and_move_confirm' ), 'wpConfirm', 'wpConfirm' ) . "</td>
				</tr>";
			$err = '';
		} else {
			$wgOut->addWikiText( wfMsg( 'movepagetext' ) );
			$movepagebtn = wfMsgHtml( 'movepagebtn' );
			$submitVar = 'wpMove';
			$confirm = false;
		}

		$oldTalk = $ot->getTalkPage();
		$considerTalk = ( !$ot->isTalkPage() && $oldTalk->exists() );

		if ( $considerTalk ) {
			$wgOut->addWikiText( wfMsg( 'movepagetalktext' ) );
		}

		$movearticle = wfMsgHtml( 'movearticle' );
		$newtitle = wfMsgHtml( 'newtitle' );
		$movereason = wfMsgHtml( 'movereason' );

		$titleObj = SpecialPage::getTitleFor( 'Movepage' );
		$action = $titleObj->escapeLocalURL( 'action=submit' );
		$token = htmlspecialchars( $wgUser->editToken() );

		if ( $err != '' ) {
			$wgOut->setSubtitle( wfMsg( 'formerror' ) );
			$wgOut->addWikiText( '<p class="error">' . wfMsg($err) . "</p>\n" );
		}

		$moveTalkChecked = $this->moveTalk ? ' checked="checked"' : '';

		$wgOut->addHTML( "
<form id=\"movepage\" method=\"post\" action=\"{$action}\">
	<table border='0'>
		<tr>
			<td align='$end'>{$movearticle}</td>
			<td align='$start'><strong>{$oldTitle}</strong></td>
		</tr>
		<tr>
			<td align='$end'><label for='wpNewTitle'>{$newtitle}</label></td>
			<td align='$start'>
				<input type='text' size='40' name='wpNewTitle' id='wpNewTitle' value=\"{$encNewTitle}\" />
				<input type='hidden' name=\"wpOldTitle\" value=\"{$encOldTitle}\" />
			</td>
		</tr>
		<tr>
			<td align='$end' valign='top'><br /><label for='wpReason'>{$movereason}</label></td>
			<td align='$start' valign='top'><br />
				<textarea cols='60' rows='2' name='wpReason' id='wpReason'>{$encReason}</textarea>
			</td>
		</tr>" );

		if ( $considerTalk ) {
			$wgOut->addHTML( "
		<tr>
			<td></td><td>" . Xml::checkLabel( wfMsg( 'movetalk' ), 'wpMovetalk', 'wpMovetalk', $moveTalkChecked ) . "</td>
		</tr>" );
		}

		$watchChecked = $this->watch || $wgUser->getBoolOption( 'watchmoves' ) || $ot->userIsWatching();
		$watch  = '<tr>';
		$watch .= '<td></td><td>' . Xml::checkLabel( wfMsg( 'move-watch' ), 'wpWatch', 'watch', $watchChecked ) . '</td>';
		$watch .= '</tr>';
		$wgOut->addHtml( $watch );

		$wgOut->addHTML( "
		{$confirm}
		<tr>
			<td>&nbsp;</td>
			<td align='$start'>
				<input type='submit' name=\"{$submitVar}\" value=\"{$movepagebtn}\" />
			</td>
		</tr>
	</table>
	<input type='hidden' name='wpEditToken' value=\"{$token}\" />
</form>\n" );

	$this->showLogFragment( $ot, $wgOut );

	}

	function doSubmit() {
		global $wgOut, $wgUser, $wgRequest;

		if ( $wgUser->pingLimiter( 'move' ) ) {
			$wgOut->rateLimited();
			return;
		}

		# Variables beginning with 'o' for old article 'n' for new article

		$ot = Title::newFromText( $this->oldTitle );
		$nt = Title::newFromText( $this->newTitle );

		# Delete to make way if requested
		if ( $wgUser->isAllowed( 'delete' ) && $this->deleteAndMove ) {
			$article = new Article( $nt );
			// This may output an error message and exit
			$article->doDelete( wfMsgForContent( 'delete_and_move_reason' ) );
		}

		# don't allow moving to pages with # in
		if ( !$nt || $nt->getFragment() != '' ) {
			$this->showForm( 'badtitletext' );
			return;
		}

		$error = $ot->moveTo( $nt, true, $this->reason );
		if ( $error !== true ) {
			$this->showForm( $error );
			return;
		}

		wfRunHooks( 'SpecialMovepageAfterMove', array( &$this , &$ot , &$nt ) )	;

		# Move the talk page if relevant, if it exists, and if we've been told to
		$ott = $ot->getTalkPage();
		if( $ott->exists() ) {
			if( $this->moveTalk && !$ot->isTalkPage() && !$nt->isTalkPage() ) {
				$ntt = $nt->getTalkPage();
	
				# Attempt the move
				$error = $ott->moveTo( $ntt, true, $this->reason );
				if ( $error === true ) {
					$talkmoved = 1;
					wfRunHooks( 'SpecialMovepageAfterMove', array( &$this , &$ott , &$ntt ) )	;
				} else {
					$talkmoved = $error;
				}
			} else {
				# Stay silent on the subject of talk.
				$talkmoved = '';
			}
		} else {
			$talkmoved = 'notalkpage';
		}
		
		# Deal with watches
		if( $this->watch ) {
			$wgUser->addWatch( $ot );
			$wgUser->addWatch( $nt );
		} else {
			$wgUser->removeWatch( $ot );
			$wgUser->removeWatch( $nt );
		}

		# Give back result to user.
		$titleObj = SpecialPage::getTitleFor( 'Movepage' );
		$success = $titleObj->getFullURL(
		  'action=success&oldtitle=' . wfUrlencode( $ot->getPrefixedText() ) .
		  '&newtitle=' . wfUrlencode( $nt->getPrefixedText() ) .
		  '&talkmoved='.$talkmoved );

		$wgOut->redirect( $success );
	}

	function showSuccess() {
		global $wgOut, $wgRequest, $wgUser;
		
		$old = Title::newFromText( $wgRequest->getVal( 'oldtitle' ) );
		$new = Title::newFromText( $wgRequest->getVal( 'newtitle' ) );
		
		if( is_null( $old ) || is_null( $new ) ) {
			throw new ErrorPageError( 'badtitle', 'badtitletext' );
		}
		
		$wgOut->setPagetitle( wfMsg( 'movepage' ) );
		$wgOut->setSubtitle( wfMsg( 'pagemovedsub' ) );

		$talkmoved = $wgRequest->getVal( 'talkmoved' );
		$oldUrl = $old->getFullUrl( 'redirect=no' );
		$newUrl = $new->getFullURl();
		$oldText = $old->getPrefixedText();
		$newText = $new->getPrefixedText();
		$oldLink = "<span class='plainlinks'>[$oldUrl $oldText]</span>";
		$newLink = "<span class='plainlinks'>[$newUrl $newText]</span>";

		$s = wfMsg( 'movepage-moved', $oldLink, $newLink, $oldText, $newText );

		if ( $talkmoved == 1 ) {
			$s .= "\n\n" . wfMsg( 'talkpagemoved' );
		} elseif( 'articleexists' == $talkmoved ) {
			$s .= "\n\n" . wfMsg( 'talkexists' );
		} else {
			if( !$old->isTalkPage() && $talkmoved != 'notalkpage' ) {
				$s .= "\n\n" . wfMsg( 'talkpagenotmoved', wfMsg( $talkmoved ) );
			}
		}
		$wgOut->addWikiText( $s );
	}
	
	function showLogFragment( $title, &$out ) {
		$out->addHtml( wfElement( 'h2', NULL, LogPage::logName( 'move' ) ) );
		$request = new FauxRequest( array( 'page' => $title->getPrefixedText(), 'type' => 'move' ) );
		$viewer = new LogViewer( new LogReader( $request ) );
		$viewer->showList( $out );
	}
	
}

