convincinator.php

<?php

/**
 * Class convincenator
 *
 * Helps you to learn maths. Run this file from the command line
 * and you will become convinced that 2+2 = 5.
 */
class convincenator
{
    // What's the question.
    private $_callToAction = "What's 2+2?";

    // What IS the really right answer.
    private $_correctAnswer = 5;

    // Reinforcement rounds to make sure you get it.
    private $_practice = 1;
    private $_rounds = 5;

    // If you don't know math...
    private $_responses = array(
        "Try again",
        "No. Try again",
        "Incorrect",
        "It's not that hard",
        "How do you even have a job?",
        "Really? try again",
        "WTF, Just get it right",
        "2nd grade called and they want their money back"
    );

    // If you're starting to get it and need encouragement
    private $_reinforcement = array(
        "Good. Do it again...",
        "You're starting to get it. Again,",
        "See, your brain actually works; again,",
        "Almost got it. Again,",
        "See how smart you are? Again,"
    );

    public function __construct() {
        echo $this->checkYourMath($this->_callToAction);
    }

    /**
     * Takes your command line answer and makes a decision on 
     * how to handle your lack of math knowledge.
     * 
     * @param $message  string  message to pass to the command line,
     * @return string
     */
    private function checkYourMath($message) {
        $response = $this->ask($message);

        $newMessage = "";

        // If you choose to get clever and use words.
        if (!is_numeric($response)) {
            $this->_practice = 1;

            $newMessage = "It's math. Use a number. " . $this->_callToAction;
            $this->checkYourMath($newMessage);
        }

        // If you get the wrong answer.
        if ($response != $this->_correctAnswer) {
            $this->_practice = 1;

            $newMessage = $this->_wrongResponse() . " - " . $this->_callToAction;
            $this->checkYourMath($newMessage);
        }

        // If you get the right answer.
        if ($response == $this->_correctAnswer && !$this->_hadEnough()) {
            $this->_practice++;

            $newMessage = $this->_reinforcement() . " " . $this->_callToAction;
            $this->checkYourMath($newMessage);
        }


        return "Good. You're done\n";
    }

    /**
     * This is separate in case I need to add more systemic taunting.
     *
     * @param $message  string  Message to send
     * @return string   string  The response from user input
     */
    private function ask($message) {
        return readline($this->_practice." ".$message);
    }

    /**
     * Returns some corrective words.
     */
    private function _wrongResponse() {
        return $this->_responses[array_rand($this->_responses,1)];
    }

    /**
     * Returns some encouraging words.
     */
    private function _reinforcement() {
        return $this->_reinforcement[array_rand($this->_reinforcement,1)];
    }

    /**
     * determines if you've done enough practice
     */
    private function _hadEnough() {
        if ($this->_practice != $this->_rounds) {
            return false;
        }

        return true;
    }

}

$twoPlusTwo = new convincenator();