<?php
namespace Geometry\Triangle;

class Triangle
{
    /**
     * Cathetus array of values
     * [a, b]
     *
     * @var array
     */
    protected $_cathethus = [0, 0];

    /**
     * Hypothenese value
     * c
     *
     * @var int
     */
    protected $_hypothenese = 0;

    /**
     * Triangle type
     *
     * @var
     */
    private $_triangleType;

    protected $_types = [
        'rectangular', 'isosceles',
        'versatile', 'equilateral'
    ];

    /**
     * @var array
     */
    private $_results = [];

    public function __construct()
    {
        $this->setCathethus();
        $this->setHypothenese();

        $this->getTriangleType();
        $this->getPerimeter();
        $this->getSquare();
    }

    /**
     * @param $cathethus
     * @return $this
     * @throws \Exception
     */
    public function setCathethus()
    {
        echo "Enter cathethus : ";
        $cathethus = explode(',', stripslashes(str_replace("\n", '', fgets(STDIN))));

        if (count($cathethus) != 2) {
            throw new \Exception('Cathethus should be limit of 2', 400);
        }

        foreach ($cathethus as $i => $catheth) {
            $this->_cathethus[$i] = (integer)$catheth;
        }

        $this->setResult('cathethus', $this->_cathethus);
        return $this;
    }

    /**
     * @param int $hypothenese
     * @return Triangle
     */
    public function setHypothenese()
    {
        echo "Enter hypothenese : ";
        $this->_hypothenese = (integer)fgets(STDIN);

        $this->setResult('hypothenese', $this->_hypothenese);

        return $this;
    }

    protected function getTriangleType()
    {

        if ($this->_cathethus[0] == $this->_cathethus[1] && $this->_cathethus[0] == $this->_hypothenese) {
            $this->_triangleType = 'Equilateral';
            $this->setResult('type', $this->_triangleType);
            return $this;
        }

        if (pow($this->_cathethus[0], 2) + pow($this->_cathethus[1], 2) == pow($this->_hypothenese, 2)) {
            $this->_triangleType = 'Rectangular';
            $this->setResult('type', $this->_triangleType);
            return $this;
        }

        if ($this->_cathethus[0] == $this->_cathethus[1] && $this->_cathethus[0] != $this->_hypothenese) {
            $this->_triangleType = 'Isosceles';
            $this->setResult('type', $this->_triangleType);
            return $this;
        }

        if ($this->_cathethus[0] != $this->_cathethus[1] && $this->_cathethus[0] != $this->_hypothenese && $this->_cathethus[1] != $this->_hypothenese) {
            $this->_triangleType = 'Versatile';
            $this->setResult('type', $this->_triangleType);
            return $this;
        }
    }

    protected function getSquare()
    {
        $p = $this->_results['perimeter'];
        $this->setResult('square', sqrt($p * ($p - $this->_cathethus[0]) * ($p - $this->_cathethus[1]) * ($p - $this->_hypothenese)));
        return $this;
    }

    protected function getPerimeter()
    {
        $this->setResult('perimeter', ($this->_cathethus[1] + $this->_cathethus[0] + $this->_hypothenese) / 2);
        return $this;
    }

    protected function setResult($key, $value)
    {
        return $this->_results[$key] = $value;
    }

    public function getResults()
    {
        return $this->_results;
    }
}

$triangle = new Triangle();
var_dump($triangle->getResults());