<?php

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

class QuestyCaptcha extends SimpleCaptcha {
	// used for questycaptcha-edit, questycaptcha-addurl, questycaptcha-badlogin,
	// questycaptcha-createaccount, questycaptcha-create, questycaptcha-sendemail via getMessage()
	protected static $messagePrefix = 'questycaptcha-';

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

	function addCaptchaAPI( &$resultArr ) {
		$captcha = $this->getCaptcha();
		$index = $this->storeCaptcha( $captcha );
		$resultArr['captcha'] = $this->describeCaptchaType();
		$resultArr['captcha']['id'] = $index;
		$resultArr['captcha']['question'] = $captcha['question'];
	}

	public function describeCaptchaType() {
		return [
			'type' => 'question',
			'mime' => 'text/plain',
		];
	}

	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 [ 'question' => $question, 'answer' => $answer ];
	}

	function getForm( OutputPage $out, $tabIndex = 1 ) {
		$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', [
				'name' => 'wpCaptchaWord',
				'id'   => 'wpCaptchaWord',
				'class' => 'mw-ui-input',
				'required',
				'autocomplete' => 'off',
				'tabindex' => $tabIndex ] ) . // tab in before the edit textarea
			"</p>\n" .
			Xml::element( 'input', [
				'type'  => 'hidden',
				'name'  => 'wpCaptchaId',
				'id'    => 'wpCaptchaId',
				'value' => $index ] );
	}

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

	public function getCaptchaInfo( $captchaData, $id ) {
		return $captchaData['question'];
	}
}