/**
 * @method each()
 * @method filter()
 * @method slice()
 * @method sort()
 * @method hasAny()
 * @method any()
 */

<?php namespace Illuminate\Database\Eloquent;

class Collection{ use FunctionalCollectionsTrait; }

trait FunctionalCollectionsTrait
{

    /**
     * Run a function over every item
     *
     * @param  Closure  $closure
     * @return bool
     */

    public function each(Closure $closure)
    {
        $this->items = array_map($closure, $this->items);
    }

    /**
     * Filter items in collection with closures
     * (keep if return true, delete if return false)
     *
     * @param  Closure  $closure
     * @return void
     */

    public function filter(Closure $closure)
    {
        $this->items =  array_filter($this->items, $closure);
    }

    /**
     * @param int $offset
     * @param int $length
     */
    public  function slice($offset, $length = 0)
    {
        if($length == 0)
            $this->items = array_slice($this->items, $offset);
        else
            $this->items = array_slice($this->items, $offset, $length);
    }


    /**
     * Sort collection by the value returned from the closure
     *
     * @param Closure $closure
     * @param string  $direction
     *
     * @return void
     */
    public function sort(Closure $closure, $direction = 'ASC')
    {
        foreach($this->items as $item)
        {
            $key = $closure($item);
            $sortable[$key] = $item;
        }
        $direction = (strtolower($direction) == 'desc') ? SORT_DESC : SORT_ASC;
        if ($direction == SORT_ASC) ksort($sortable);
        else krsort($sortable);

        $this->items = array_values($sortable);
    }

    /**
     * Check if any item matches a truth test
     *
     * @param Closure $closure
     *
     * @return bool
     */
    public function hasAny(Closure $closure)
    {
       foreach($this->items as $item)
       {
           if($closure($item)) return true;
       }
       return false;
    }

    /**
     * Determine if the collection is empty or not.
     *
     * @return bool
     */
    public function isEmpty()
    {
        return empty($this->items);
    }

}