<?php
interface ShipCompareable {
    public function compare($a);
}
//15. корабль, пароход, парусник, корвет.
abstract class Ship implements ShipCompareable{
    protected $vodoizm;//Водоизмещение
    protected $nazv;//назв коробля
    protected $date;//дата спуска на воду

    public function __construct($nazv, $vodoizm, $date)
    {
        $this->nazv = $nazv;
        $this->vodoizm = $vodoizm;
        $this->date = $date;
    }

    public function setNazv($nazv) {
        $this->nazv = $nazv;
    }

    public function setVodoizm($vodoizm) {
        $this->vodoizm = $vodoizm;
    }

    public function setDate($date) {
        $this->date = $date;
    }

    public function getNazv() {
        echo 'Nazvanie '.$this->nazv;
    }

    public function getVodoizm() {
        echo 'Vodoizmeshchenie '.$this->vodoizm;
    }

    public function getDate() {
        echo 'Data '.$this->date;
    }

    public function __toString() {
        return 'Nazvanie '.$this->nazv.' Vodoizmeshchenie '.$this->vodoizm.' Data '.$this->date;
    }
     public function compare($a) {
        return get_class($a)::compare($a);
    }
}

class Parohod extends Ship {
    private $country;

    public function __construct($nazv, $vodoizm, $date, $country)
    {
        parent::__construct($nazv, $vodoizm, $date);
        $this->country = $country;
    }

    public function setCountry($country) {
        $this->country = $country;
    }

    public function getCountry() {
        echo 'Strana '.$this->country;
    }

    public function __toString() {
        return 'Nazvanie '.$this->nazv.' Vodoizmeshchenie '.$this->vodoizm.' Data '.$this->date.' Strana '.$this->country;
    }
     public function compare($a) {
        if (get_class($this) != get_class($a)) return 0;
        return ($this->nazv[0] > $a->nazv[0]) ? 0 : 1;
    }
}

class Parus extends Ship {
    private $ekipazh;

    public function __construct($nazv, $vodoizm, $date, $ekipazh)
    {
        parent::__construct($nazv, $vodoizm, $date);
        $this->ekipazh = $ekipazh;
    }

    public function setEkipazh($ekipazh) {
        $this->ekipazh = $ekipazh;
    }

    public function getEkipazh() {
        echo 'Ekipazh '.$this->ekipazh;
    }

    public function __toString() {
        return 'Nazvanie '.$this->nazv.' Vodoizmeshchenie '.$this->vodoizm.' Data '.$this->date.' Ekipazh '.$this->ekipazh; //экипаж
    }
    public function compare($a) {
        if (get_class($this) != get_class($a)) return 0;
        return ($this->nazv[0] > $a->nazv[0]) ? 0 : 1;
    }
}

class Korvet extends Ship {
    private $engine;

    public function __construct($nazv, $vodoizm, $date, $engine)
    {
        parent::__construct($nazv, $vodoizm, $date);
        $this->engine = $engine;
    }

    public function setEngine($engine) {
        $this->engine = $engine;
    }

    public function getEngine() {
        echo 'Dvigatel '.$this->engine;
    }

    public function __toString() {
        return 'Nazvanie '.$this->nazv.' Vodoizmeshchenie '.$this->vodoizm.' Data '.$this->date.' Dvigatel '.$this->engine; //двигатель
    }
    public function compare($a) {
        if (get_class($this) != get_class($a)) return 0;
        return ($this->nazv[0] > $a->nazv[0]) ? 0 : 1;
    }
}
class ShipList {
    protected $array = [];

    public function addToEnd($item) {
        $this->array[] = $item;
    }

    public function addToPosition($item, $index) {
        array_splice( $this->array, $index, 0, $item );
    }

    public function deleteByIndex($index) {
        array_splice($this->array, $index, 1);
    }

    public function deleteAllElements() {
        $this->array = [];
    }

    public function printByIndex($index) {
        echo $this->array[$index];
    }

    private function sortByClass() {
        for($i=0; $i< count($this->array); $i++){
            for($j=$i+1; $j<count($this->array); $j++){
                if(get_class($this->array[$i]) < get_class($this->array[$j])){
                    $temp = $this->array[$j];
                    $this->array[$j] = $this->array[$i];
                    $this->array[$i] = $temp;
                }
            }
        }
    }

    private function sortByField() {
        for($i=0; $i< count($this->array); $i++){
            for($j=$i+1; $j<count($this->array); $j++){
                if( $this->array[$i]->compare($this->array[$j]) > 0){
                    $temp = $this->array[$j];
                    $this->array[$j] = $this->array[$i];
                    $this->array[$i] = $temp;
                }
            }
        }
    }

    public function sort() {
        //$this->sortByClass();
        $this->sortByField();
    }

    public function printList() {
        foreach ($this->array as $item) {
            echo $item."\n";
        }
    }
}
$list = new ShipList();

$list->addToEnd(new Parohod('Parohod', 45000, '25.12.1999', 'Great Britain'));
$list->addToEnd(new Parus('Parus', 14000, '17.06.1985',90));
$list->addToEnd(new Parohod('Parohod', 44000, '25.12.1999', 'Great Britain'));
$list->addToEnd(new Parohod('Parohod', 47000, '25.12.1999', 'Great Britain'));
$list->addToEnd(new Korvet('Korvet', 22000, '14.08.1996','4 dizelya'));
$list->addToEnd(new Parus('Parus', 16000, '17.06.1985',90));
$list->addToEnd(new Parus('Parus', 15000, '17.06.1985',90));
$list->addToEnd(new Korvet('Korvet', 23000, '14.08.1996','4 dizelya'));

$list->printList();
echo "SORTED: \n\n";
$list->sort();
$list->printList();