<?php
/**
 * Copyright 2014 Openstack Foundation
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

if ( ! function_exists('array_add'))
{
	/**
	 * Add an element to an array if it doesn't exist.
	 *
	 * @param  array   $array
	 * @param  string  $key
	 * @param  mixed   $value
	 * @return array
	 */
	function array_add($array, $key, $value)
	{
		if ( ! isset($array[$key])) $array[$key] = $value;

		return $array;
	}
}

if ( ! function_exists('array_build'))
{
	/**
	 * Build a new array using a callback.
	 *
	 * @param  array  $array
	 * @param  \Closure  $callback
	 * @return array
	 */
	function array_build($array, Closure $callback)
	{
		$results = array();

		foreach ($array as $key => $value)
		{
			list($innerKey, $innerValue) = call_user_func($callback, $key, $value);

			$results[$innerKey] = $innerValue;
		}

		return $results;
	}
}

if ( ! function_exists('array_divide'))
{
	/**
	 * Divide an array into two arrays. One with keys and the other with values.
	 *
	 * @param  array  $array
	 * @return array
	 */
	function array_divide($array)
	{
		return array(array_keys($array), array_values($array));
	}
}

if ( ! function_exists('array_dot'))
{
	/**
	 * Flatten a multi-dimensional associative array with dots.
	 *
	 * @param  array   $array
	 * @param  string  $prepend
	 * @return array
	 */
	function array_dot($array, $prepend = '')
	{
		$results = array();

		foreach ($array as $key => $value)
		{
			if (is_array($value))
			{
				$results = array_merge($results, array_dot($value, $prepend.$key.'.'));
			}
			else
			{
				$results[$prepend.$key] = $value;
			}
		}

		return $results;
	}
}

if ( ! function_exists('array_except'))
{
	/**
	 * Get all of the given array except for a specified array of items.
	 *
	 * @param  array  $array
	 * @param  array  $keys
	 * @return array
	 */
	function array_except($array, $keys)
	{
		return array_diff_key($array, array_flip((array) $keys));
	}
}

if ( ! function_exists('array_fetch'))
{
	/**
	 * Fetch a flattened array of a nested array element.
	 *
	 * @param  array   $array
	 * @param  string  $key
	 * @return array
	 */
	function array_fetch($array, $key)
	{
		foreach (explode('.', $key) as $segment)
		{
			$results = array();

			foreach ($array as $value)
			{
				$value = (array) $value;

				$results[] = $value[$segment];
			}

			$array = array_values($results);
		}

		return array_values($results);
	}
}

if ( ! function_exists('array_first'))
{
	/**
	 * Return the first element in an array passing a given truth test.
	 *
	 * @param  array    $array
	 * @param  Closure  $callback
	 * @param  mixed    $default
	 * @return mixed
	 */
	function array_first($array, $callback, $default = null)
	{
		foreach ($array as $key => $value)
		{
			if (call_user_func($callback, $key, $value)) return $value;
		}

		return value($default);
	}
}

if ( ! function_exists('array_last'))
{
	/**
	 * Return the last element in an array passing a given truth test.
	 *
	 * @param  array    $array
	 * @param  Closure  $callback
	 * @param  mixed    $default
	 * @return mixed
	 */
	function array_last($array, $callback, $default = null)
	{
		return array_first(array_reverse($array), $callback, $default);
	}
}

if ( ! function_exists('array_flatten'))
{
	/**
	 * Flatten a multi-dimensional array into a single level.
	 *
	 * @param  array  $array
	 * @return array
	 */
	function array_flatten($array)
	{
		$return = array();

		array_walk_recursive($array, function($x) use (&$return) { $return[] = $x; });

		return $return;
	}
}

if ( ! function_exists('array_forget'))
{
	/**
	 * Remove an array item from a given array using "dot" notation.
	 *
	 * @param  array   $array
	 * @param  string  $key
	 * @return void
	 */
	function array_forget(&$array, $key)
	{
		$keys = explode('.', $key);

		while (count($keys) > 1)
		{
			$key = array_shift($keys);

			if ( ! isset($array[$key]) || ! is_array($array[$key]))
			{
				return;
			}

			$array =& $array[$key];
		}

		unset($array[array_shift($keys)]);
	}
}

if ( ! function_exists('array_get'))
{
	/**
	 * Get an item from an array using "dot" notation.
	 *
	 * @param  array   $array
	 * @param  string  $key
	 * @param  mixed   $default
	 * @return mixed
	 */
	function array_get($array, $key, $default = null)
	{
		if (is_null($key)) return $array;

		if (isset($array[$key])) return $array[$key];

		foreach (explode('.', $key) as $segment)
		{
			if ( ! is_array($array) || ! array_key_exists($segment, $array))
			{
				return value($default);
			}

			$array = $array[$segment];
		}

		return $array;
	}
}


if ( ! function_exists('value'))
{
	/**
	 * Return the default value of the given value.
	 *
	 * @param  mixed  $value
	 * @return mixed
	 */
	function value($value)
	{
		return $value instanceof Closure ? $value() : $value;
	}
}


if ( ! function_exists('snake_case'))
{
	/**
	 * Convert a string to snake case.
	 *
	 * @param  string  $value
	 * @param  string  $delimiter
	 * @return string
	 */
	function snake_case($value, $delimiter = '_')
	{
		$replace = '$1'.$delimiter.'$2';

		return ctype_lower($value) ? $value : strtolower(preg_replace('/(.)([A-Z])/', $replace, $value));
	}
}

if ( ! function_exists('studly_case'))
{

	function studly_case($value)
	{
		$value = ucwords(str_replace(array('-', '_'), ' ', $value));

		return str_replace(' ', '', $value);
	}
}


if ( ! function_exists('array_only'))
{
	/**
	 * Get a subset of the items from the given array.
	 *
	 * @param  array  $array
	 * @param  array  $keys
	 * @return array
	 */
	function array_only($array, $keys)
	{
		return array_intersect_key($array, array_flip((array) $keys));
	}
}

if ( ! function_exists('array_pluck'))
{
	/**
	 * Pluck an array of values from an array.
	 *
	 * @param  array   $array
	 * @param  string  $value
	 * @param  string  $key
	 * @return array
	 */
	function array_pluck($array, $value, $key = null)
	{
		$results = array();

		foreach ($array as $item)
		{
			$itemValue = is_object($item) ? $item->{$value} : $item[$value];

			// If the key is "null", we will just append the value to the array and keep
			// looping. Otherwise we will key the array using the value of the key we
			// received from the developer. Then we'll return the final array form.
			if (is_null($key))
			{
				$results[] = $itemValue;
			}
			else
			{
				$itemKey = is_object($item) ? $item->{$key} : $item[$key];

				$results[$itemKey] = $itemValue;
			}
		}

		return $results;
	}
}

if ( ! function_exists('array_pull'))
{
	/**
	 * Get a value from the array, and remove it.
	 *
	 * @param  array   $array
	 * @param  string  $key
	 * @return mixed
	 */
	function array_pull(&$array, $key)
	{
		$value = array_get($array, $key);

		array_forget($array, $key);

		return $value;
	}
}

if ( ! function_exists('array_set'))
{
	/**
	 * Set an array item to a given value using "dot" notation.
	 *
	 * If no key is given to the method, the entire array will be replaced.
	 *
	 * @param  array   $array
	 * @param  string  $key
	 * @param  mixed   $value
	 * @return array
	 */
	function array_set(&$array, $key, $value)
	{
		if (is_null($key)) return $array = $value;

		$keys = explode('.', $key);

		while (count($keys) > 1)
		{
			$key = array_shift($keys);

			// If the key doesn't exist at this depth, we will just create an empty array
			// to hold the next value, allowing us to create the arrays to hold final
			// values at the correct depth. Then we'll keep digging into the array.
			if ( ! isset($array[$key]) || ! is_array($array[$key]))
			{
				$array[$key] = array();
			}

			$array =& $array[$key];
		}

		$array[array_shift($keys)] = $value;

		return $array;
	}
}

if ( ! function_exists('array_where'))
{
	/**
	 * Filter the array using the given Closure.
	 *
	 * @param  array  $array
	 * @param  \Closure  $callback
	 * @return array
	 */
	function array_where($array, Closure $callback)
	{
		$filtered = array();

		foreach ($array as $key => $value)
		{
			if (call_user_func($callback, $key, $value)) $filtered[$key] = $value;
		}

		return $filtered;
	}
}