<?php

namespace ORM;

// https://stitcher.io/blog/typed-properties-in-php-74
// https://dev.to/chemaclass/typed-arrays-in-php-hoo
class Collection implements \Countable, \IteratorAggregate, \ArrayAccess
{

    private Array $items;

    function __construct(array $items = array())
    {
        $this->items = $items;
    }

    public function addItem(Entity $item)
    {
        $this->items[] = $item;
    }

    // https://www.php.net/manual/en/class.countable.php
    public function count()
    {
        return count($this->items);
    }

    // https://www.php.net/manual/en/class.iteratoraggregate.php
    public function getIterator()
    {
        return (function () {
            while (list($key, $val) = each($this->items)) {
                yield $key => $val;
            }
        })();
    }

    // https://www.php.net/manual/en/class.arrayaccess.php
    public function offsetSet($offset, $value)
    {
        if (is_null($offset)) {
            $this->items[] = $value;
        } else {
            $this->items[$offset] = $value;
        }
    }

    public function offsetExists($offset)
    {
        return isset($this->items[$offset]);
    }

    public function offsetUnset($offset)
    {
        unset($this->items[$offset]);
    }

    public function offsetGet($offset)
    {
        return isset($this->items[$offset]) ? $this->items[$offset] : null;
    }

    //
    // -----------------------------------
    // Magic methods
    //

    public function __call($name, $arguments)
    {
        if (sizeof($this->items) == 1) {
            return $this->items[0]->$name();
        } else {
            throw new \Exception('Undefined method or Multiple values on set');
        }
    }

    //
    // -----------------------------------
    // Collection specific methods
    //

    function get($forceCollection = false)
    {
        if (sizeof($this->items) == 1 && !$forceCollection) {
            return $this->items[0];
        } else {
            return $this->items;
        }
    }

    function with(array $connections = array())
    {

        $searchs = array();

        foreach ($this->items as $key => $item) {
            foreach ($connections as $connection) {
                $relation = $item->$connection();

                switch (get_class($relation)) {
                    case 'ORM\HasMany':
                        $this->items[$key]->$connection = $this->items[$key]->$connection()->get();
                        break;
                    case 'ORM\HasOne':
                        $this->items[$key]->$connection = $this->items[$key]->$connection()->get();
                        break;
                    case 'ORM\BelongsTo':
                        $this->items[$key]->$connection = $this->items[$key]->$connection()->get();
                        break;
                    case 'ORM\BelongsToMany':
                        $this->items[$key]->$connection = $this->items[$key]->$connection()->get();
                        break;
                    case 'ORM\BelongsToManyExtended':
                        $this->items[$key]->$connection = $this->items[$key]->$connection()->get();
                        break;
                    default:
                        $this->items[$key]->$connection = $this->items[$key]->$connection()->get();
                        break;
                }
            }
        }

        return $this->items;
    }

    function first()
    {
        if (isset($this->items[0])) {
            return $this->items[0];
        }
    }

    /**
     * Iterate over the colletion
     *
     * @param mixed $function
     * @return void
     */
    function each($function)
    {
        foreach($this->items as $item){
            $function($item);
        }
    }
}