<?php

/*
 * This file is part of the overtrue/wechat.
 *
 * (c) overtrue <i@overtrue.me>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace EasyWeChat\Kernel\Support;

use ArrayAccess;
use ArrayIterator;
use Countable;
use EasyWeChat\Kernel\Contracts\Arrayable;
use IteratorAggregate;
use JsonSerializable;
use Serializable;

/**
 * Class Collection.
 */
class Collection implements ArrayAccess, Countable, IteratorAggregate, JsonSerializable, Serializable, Arrayable
{
 /**
 * The collection data.
 *
 * @var array
 */
 protected $items = [];

 /**
 * set data.
 *
 * @param array $items
 */
 public function __construct(array $items = [])
 {
 foreach ($items as $key => $value) {
 $this->set($key, $value);
 }
 }

 /**
 * Return all items.
 *
 * @return array
 */
 public function all()
 {
 return $this->items;
 }

 /**
 * Return specific items.
 *
 * @param array $keys
 *
 * @return \EasyWeChat\Kernel\Support\Collection
 */
 public function only(array $keys)
 {
 $return = [];

 foreach ($keys as $key) {
 $value = $this->get($key);

 if (!is_null($value)) {
 $return[$key] = $value;
 }
 }

 return new static($return);
 }

 /**
 * Get all items except for those with the specified keys.
 *
 * @param mixed $keys
 *
 * @return static
 */
 public function except($keys)
 {
 $keys = is_array($keys) ? $keys : func_get_args();

 return new static(Arr::except($this->items, $keys));
 }

 /**
 * Merge data.
 *
 * @param Collection|array $items
 *
 * @return \EasyWeChat\Kernel\Support\Collection
 */
 public function merge($items)
 {
 $clone = new static($this->all());

 foreach ($items as $key => $value) {
 $clone->set($key, $value);
 }

 return $clone;
 }

 /**
 * To determine Whether the specified element exists.
 *
 * @param string $key
 *
 * @return bool
 */
 public function has($key)
 {
 return !is_null(Arr::get($this->items, $key));
 }

 /**
 * Retrieve the first item.
 *
 * @return mixed
 */
 public function first()
 {
 return reset($this->items);
 }

 /**
 * Retrieve the last item.
 *
 * @return bool
 */
 public function last()
 {
 $end = end($this->items);

 reset($this->items);

 return $end;
 }

 /**
 * add the item value.
 *
 * @param string $key
 * @param mixed $value
 */
 public function add($key, $value)
 {
 Arr::set($this->items, $key, $value);
 }

 /**
 * Set the item value.
 *
 * @param string $key
 * @param mixed $value
 */
 public function set($key, $value)
 {
 Arr::set($this->items, $key, $value);
 }

 /**
 * Retrieve item from Collection.
 *
 * @param string $key
 * @param mixed $default
 *
 * @return mixed
 */
 public function get($key, $default = null)
 {
 return Arr::get($this->items, $key, $default);
 }

 /**
 * Remove item form Collection.
 *
 * @param string $key
 */
 public function forget($key)
 {
 Arr::forget($this->items, $key);
 }

 /**
 * Build to array.
 *
 * @return array
 */
 public function toArray()
 {
 return $this->all();
 }

 /**
 * Build to json.
 *
 * @param int $option
 *
 * @return string
 */
 public function toJson($option = JSON_UNESCAPED_UNICODE)
 {
 return json_encode($this->all(), $option);
 }

 /**
 * To string.
 *
 * @return string
 */
 public function __toString()
 {
 return $this->toJson();
 }

 /**
 * (PHP 5 &gt;= 5.4.0)<br/>
 * Specify data which should be serialized to JSON.
 *
 * @see http://php.net/manual/en/jsonserializable.jsonserialize.php
 *
 * @return mixed data which can be serialized by <b>json_encode</b>,
 * which is a value of any type other than a resource
 */
 public function jsonSerialize()
 {
 return $this->items;
 }

 /**
 * (PHP 5 &gt;= 5.1.0)<br/>
 * String representation of object.
 *
 * @see http://php.net/manual/en/serializable.serialize.php
 *
 * @return string the string representation of the object or null
 */
 public function serialize()
 {
 return serialize($this->items);
 }

 /**
 * (PHP 5 &gt;= 5.0.0)<br/>
 * Retrieve an external iterator.
 *
 * @see http://php.net/manual/en/iteratoraggregate.getiterator.php
 *
 * @return \ArrayIterator An instance of an object implementing <b>Iterator</b> or
 * <b>Traversable</b>
 */
 public function getIterator()
 {
 return new ArrayIterator($this->items);
 }

 /**
 * (PHP 5 &gt;= 5.1.0)<br/>
 * Count elements of an object.
 *
 * @see http://php.net/manual/en/countable.count.php
 *
 * @return int the custom count as an integer.
 * </p>
 * <p>
 * The return value is cast to an integer
 */
 public function count()
 {
 return count($this->items);
 }

 /**
 * (PHP 5 &gt;= 5.1.0)<br/>
 * Constructs the object.
 *
 * @see http://php.net/manual/en/serializable.unserialize.php
 *
 * @param string $serialized <p>
 * The string representation of the object.
 * </p>
 *
 * @return mixed|void
 */
 public function unserialize($serialized)
 {
 return $this->items = unserialize($serialized);
 }

 /**
 * Get a data by key.
 *
 * @param string $key
 *
 * @return mixed
 */
 public function __get($key)
 {
 return $this->get($key);
 }

 /**
 * Assigns a value to the specified data.
 *
 * @param string $key
 * @param mixed $value
 */
 public function __set($key, $value)
 {
 $this->set($key, $value);
 }

 /**
 * Whether or not an data exists by key.
 *
 * @param string $key
 *
 * @return bool
 */
 public function __isset($key)
 {
 return $this->has($key);
 }

 /**
 * Unset an data by key.
 *
 * @param string $key
 */
 public function __unset($key)
 {
 $this->forget($key);
 }

 /**
 * var_export.
 *
 * @return array
 */
 public function __set_state()
 {
 return $this->all();
 }

 /**
 * (PHP 5 &gt;= 5.0.0)<br/>
 * Whether a offset exists.
 *
 * @see http://php.net/manual/en/arrayaccess.offsetexists.php
 *
 * @param mixed $offset <p>
 * An offset to check for.
 * </p>
 *
 * @return bool true on success or false on failure.
 * The return value will be casted to boolean if non-boolean was returned
 */
 public function offsetExists($offset)
 {
 return $this->has($offset);
 }

 /**
 * (PHP 5 &gt;= 5.0.0)<br/>
 * Offset to unset.
 *
 * @see http://php.net/manual/en/arrayaccess.offsetunset.php
 *
 * @param mixed $offset <p>
 * The offset to unset.
 * </p>
 */
 public function offsetUnset($offset)
 {
 if ($this->offsetExists($offset)) {
 $this->forget($offset);
 }
 }

 /**
 * (PHP 5 &gt;= 5.0.0)<br/>
 * Offset to retrieve.
 *
 * @see http://php.net/manual/en/arrayaccess.offsetget.php
 *
 * @param mixed $offset <p>
 * The offset to retrieve.
 * </p>
 *
 * @return mixed Can return all value types
 */
 public function offsetGet($offset)
 {
 return $this->offsetExists($offset) ? $this->get($offset) : null;
 }

 /**
 * (PHP 5 &gt;= 5.0.0)<br/>
 * Offset to set.
 *
 * @see http://php.net/manual/en/arrayaccess.offsetset.php
 *
 * @param mixed $offset <p>
 * The offset to assign the value to.
 * </p>
 * @param mixed $value <p>
 * The value to set.
 * </p>
 */
 public function offsetSet($offset, $value)
 {
 $this->set($offset, $value);
 }
}