block

block.php

<?php

namespace App\Blocks_V2\MAT\MAT_4\MAT_4_A\MAT_4_A_02;

use App\Blocks\Repository\BlockBase;
use App\Blocks\Repository\TextProblems\TextTemplate;

class MAT_4_A_02_01 extends BlockBase
{    
    protected $config = [
        'es' => [ 
            'instruction' => 'Selecciona la respuesta correcta.',
            'problem' => '{{comparasion_string}} cantidad de {{object_name}}.',
            'objects' => [
                [
                    'name' => 'manzanas',
                    'img' => 'apple'
                ],
                [
                    'name' => 'hamburguesas',
                    'img' => 'hamburger'
                ],
                [
                    'name' => 'tazas de cafe',
                    'img' => 'cup_of_coffe'
                ],
                [
                    'name' => 'cerezas',
                    'img' => 'cherries'
                ]
            ],
            'operators' => [
                '>' => 'Mayor',
                '<' => 'Menor',
            ]
        ],
        'en' => [ 
            'instruction' => 'Select de correct answer.',
            'problem' => '{{comparasion_string}} amount of {{name}}.',
            'fruits' => [
                [
                    'name' => 'apples',
                    'img' => 'apple'
                ],
                [
                    'name' => 'hamburgers',
                    'img' => 'hamburger'
                ],
                [
                    'name' => 'cup of coffer',
                    'img' => 'cup_of_coffe'
                ],
                [
                    'name' => 'cherries',
                    'img' => 'cherries'
                ]
            ],
            'operators' => [
                '>' => 'Grater',
                '<' => 'Smaller',
            ]
        ],
    ];
    protected $difficulty = [
        'easy' => [
            'number-range' => [2, 4],
            'comparison-operator' => ['>']
        ],
        'medium' => [
            'number-range' => [4, 6],
            'comparison-operator' => ['<']
        ],
        'hard' => [
            'number-range' => [4, 7],
            'comparison-operator' => ['<', '>']
        ],
    ];

    public function __construct()
    {
        parent::__construct();

        $this->textTemplate = new TextTemplate;
    }
    
    public function generate()
    {    
        $object = array_random($this->config['objects']);

        $result = $this->getBoolean();

        $comparison = $this->getComparison();

        $numbers = $this->getNumbers($result, $comparison['operator']);

        $textProblem = $this->textTemplate
                        ->setText($this->config['problem'])
                        ->replace([
                            'object_name' => $object['name'],
                            'comparasion_string' => $comparison['string']
                        ]);

        return [
            'problem' => $textProblem,
            'result' => (int)$result,
            'options' => $numbers,
            'img_type' => $object['img']
        ];
    }

    /**
     * return and array with two number
     * @return array
     */
    private function getNumbers(bool $result, string $comparisonOperator) : array
    { 
        do {
            $number_1 = rand(...$this->get('number-range'));
            $number_2 = rand(...$this->get('number-range'));
        } while ($this->areValidNumbers($result, $comparisonOperator, $number_1, $number_2));
           
        return [
            $number_1,
            $number_2
        ];
    }

    private function areValidNumbers(bool $result, string $comparisonOperator, int $number1, int $number2)
    {
        if($number1 == $number2)
            return true;#we return true when the numbers are equal for the while generate another number

        $comparisonIsValid = eval("return {$number1} {$comparisonOperator} {$number2};");

        return $result == $comparisonIsValid;
    }

    /**
     * get a random comparation operator and get the string 
     * @return array example(["operator" => ">", "string" => "Mayor"])
     */
    private function getComparison() : array
    {
        $operator = array_random($this->get('comparison-operator'));

        $string = $this->config['operators'][$operator];

        return compact('operator', 'string');
    }
}