<?php

/**
 * QuestyCaptcha class
 *
 * @file
 * @author Benjamin Lees <emufarmers@gmail.com>
 * @ingroup Extensions
 */

class QuestyCaptcha extends SimpleCaptcha {

	/** Validate a captcha response */
	function keyMatch( $answer, $info ) {
		if ( is_array( $info['answer'] ) ) {
			return in_array( strtolower( $answer ), $info['answer'] );
		} else {
			return strtolower( $answer ) == strtolower( $info['answer'] );
		}
	}

	function addCaptchaAPI( &$resultArr ) {
		$captcha = $this->getCaptcha();
		$index = $this->storeCaptcha( $captcha );
		$resultArr['captcha']['type'] = 'question';
		$resultArr['captcha']['mime'] = 'text/plain';
		$resultArr['captcha']['id'] = $index;
		$resultArr['captcha']['question'] = $captcha['question'];
	}

	function getCaptcha() {
		global $wgCaptchaQuestions;

		//Backwards compatibility
		if ( $wgCaptchaQuestions === array_values( $wgCaptchaQuestions ) ) {
			return $wgCaptchaQuestions[ mt_rand( 0, count( $wgCaptchaQuestions ) - 1 ) ];
		}

		$question = array_rand( $wgCaptchaQuestions, 1 );
		$answer = $wgCaptchaQuestions[ $question ];
		return array( 'question' => $question, 'answer' => $answer );
	}

	function getForm() {
		$captcha = $this->getCaptcha();
		if ( !$captcha ) {
			die( "No questions found; set some in LocalSettings.php using the format from QuestyCaptcha.php." );
		}
		$index = $this->storeCaptcha( $captcha );
		return "<p><label for=\"wpCaptchaWord\">{$captcha['question']}</label> " .
			Html::element( 'input', array(
				'name' => 'wpCaptchaWord',
				'id'   => 'wpCaptchaWord',
				'class' => 'mw-ui-input',
				'required',
				'autocomplete' => 'off',
				'tabindex' => 1 ) ) . // tab in before the edit textarea
			"</p>\n" .
			Xml::element( 'input', array(
				'type'  => 'hidden',
				'name'  => 'wpCaptchaId',
				'id'    => 'wpCaptchaId',
				'value' => $index ) );
	}

	function getMessage( $action ) {
		$name = 'questycaptcha-' . $action;
		$text = wfMessage( $name )->text();
		# Obtain a more tailored message, if possible, otherwise, fall back to
		# the default for edits
		return wfMessage( $name, $text )->isDisabled() ? wfMessage( 'questycaptcha-edit' )->text() : $text;
	}

	function showHelp() {
		global $wgOut;
		$wgOut->setPageTitle( wfMessage( 'captchahelp-title' )->text() );
		$wgOut->addWikiMsg( 'questycaptchahelp-text' );
		if ( CaptchaStore::get()->cookiesNeeded() ) {
			$wgOut->addWikiMsg( 'captchahelp-cookies-needed' );
		}
	}
}
