<?php
/**
 * API module to send thanks notifications
 *
 * @ingroup API
 * @ingroup Extensions
 */
class ApiThank extends ApiBase {
	public function execute() {
		global $wgThanksLogging;

		if ( !class_exists( 'EchoNotifier' ) ) {
			$this->dieUsage( 'Echo is not installed on this wiki', 'echonotinstalled' );
		}

		$agent = $this->getUser();
		if ( $agent->isAnon() ) {
			$this->dieUsage( 'Anonymous users cannot send thanks', 'notloggedin' );
		}
		if ( $agent->pingLimiter( 'thanks-notification' ) ) {
			$this->dieUsageMsg( array( 'actionthrottledtext' ) );
		}
		if ( $agent->isBlocked() ) {
			$this->dieUsageMsg( array( 'blockedtext' ) );
		}
		$params = $this->extractRequestParams();
		$rev = Revision::newFromId( $params['rev'] );
		$result = array();
		if ( !$rev ) {
			$this->dieUsage( 'Revision ID is not valid', 'invalidrevision' );
		} else {
			// Do not send notification if session data says "it has already been sent"
			if ( !$agent->getRequest()->getSessionData( "thanks-thanked-{$rev->getId()}" ) ) {
				$title = Title::newFromID( $rev->getPage() );
				if ( !$title ) {
					$this->dieUsage( 'Page title could not be retrieved', 'notitle' );
				}

				// Get the user ID of the user who performed the edit
				$recipient = $rev->getUser();

				if ( !$recipient ) {
					$this->dieUsage( 'No valid recipient found', 'invalidrecipient' );
				} else {
					// Set the source of the thanks, e.g. 'diff' or 'history'
					if ( $params['source'] ) {
						$source = trim( $params['source'] );
					} else {
						$source = 'undefined';
					}
					// Create the notification via Echo extension
					EchoEvent::create( array(
						'type' => 'edit-thank',
						'title' => $title,
						'extra' => array(
							'revid' => $rev->getId(),
							'thanked-user-id' => $recipient,
							'source' => $source,
						),
						'agent' => $agent,
					) );
					// Mark the thank in session to prevent duplicates (Bug 46690)
					$agent->getRequest()->setSessionData( "thanks-thanked-{$rev->getId()}", true );
					// Set success message
					$result['success'] = '1';
					// Log it if we're supposed to log it
					if ( $wgThanksLogging ) {
						$logEntry = new ManualLogEntry( 'thanks', 'thank' );
						$logEntry->setPerformer( $agent );
						$target = User::newFromId( $recipient )->getUserPage();
						$logEntry->setTarget( $target );
						$logid = $logEntry->insert();
					}
				}
			} else {
				$result['success'] = '1';
			}
		}
		$this->getResult()->addValue( null, 'result', $result );
	}

	public function getDescription() {
		return array(
			'This API is for sending thank you notifications from one editor to another.',
		);
	}

	public function getParamDescription() {
		return array(
			'rev' => 'A revision ID for an edit that you want to thank someone for',
			'token' => 'An edit token (to prevent CSRF abuse)',
			'source' => "A short string describing the source of the request, for example, 'diff' or 'history'",
		);
	}

	public function getAllowedParams() {
		return array(
			'rev' => array(
				ApiBase::PARAM_TYPE => 'integer',
				ApiBase::PARAM_MIN => 1,
				ApiBase::PARAM_REQUIRED => true,
			),
			'token' => array(
				ApiBase::PARAM_TYPE => 'string',
				ApiBase::PARAM_REQUIRED => true,
			),
			'source' => array(
				ApiBase::PARAM_TYPE => 'string',
				ApiBase::PARAM_REQUIRED => false,
			)
		);
	}

	public function needsToken() {
		return true;
	}

	public function getTokenSalt() {
		return '';
	}

	public function getVersion() {
		return __CLASS__ . '-1.0';
	}
}