<?php
/**
 * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
 *
 * You are hereby granted a non-exclusive, worldwide, royalty-free license to
 * use, copy, modify, and distribute this software in source code or binary
 * form for use in connection with the web services and APIs provided by
 * Facebook.
 *
 * As with any software that integrates with the Facebook platform, your use
 * of this software is subject to the Facebook Developer Principles and
 * Policies [http://developers.facebook.com/policy/]. This copyright notice
 * shall be included in all copies or substantial portions of the software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 */

namespace FacebookAds\Enum;

abstract class AbstractEnum implements EnumInstanceInterface {

  /**
   * @var array|null
   */
  protected $map = null;

  /**
   * @var array|null
   */
  protected $names = null;

  /**
   * @var array|null
   */
  protected $values = null;

  /**
   * @var array|null
   */
  protected $valuesMap = null;

  /**
   * @var AbstractEnum[]
   */
  protected static $instances = array();

  /**
   * @return string
   */
  static function className() {
    return get_called_class();
  }

  /**
   * @return AbstractEnum
   */
  public static function getInstance() {
    $fqn = get_called_class();
    if (!array_key_exists($fqn, static::$instances)) {
      static::$instances[$fqn] = new static();
    }

    return static::$instances[$fqn];
  }

  /**
   * @return array
   */
  public function getArrayCopy() {
    if ($this->map === null) {
      $this->map = (new \ReflectionClass(get_called_class()))
        ->getConstants();
    }

    return $this->map;
  }

  /**
   * @return array
   */
  public function getNames() {
    if ($this->names === null) {
      $this->names = array_keys($this->getArrayCopy());
    }

    return $this->names;
  }

  /**
   * @return array
   */
  public function getValues() {
    if ($this->values === null) {
      $this->values = array_values($this->getArrayCopy());
    }

    return $this->values;
  }

  /**
   * @return array
   */
  public function getValuesMap() {
    if ($this->valuesMap === null) {
      $this->valuesMap = array_fill_keys($this->getValues(), null);
    }

    return $this->valuesMap;
  }

  /**
   * @param string|int|float $name
   * @return mixed
   */
  public function getValueForName($name) {
    $copy = $this->getArrayCopy();
    return array_key_exists($name, $copy)
      ? $copy[$name]
      : null;
  }

  /**
   * @param string|int|float $name
   * @return mixed
   * @throws \InvalidArgumentException
   */
  public function assureValueForName($name) {
    $value = $this->getValueForName($name);
    if ($value === null) {
      throw new \InvalidArgumentException(
        'Unknown name "'.$name.'" in '.static::className());
    }

    return $value;
  }

  /**
   * @param string|int|float $name
   * @return bool
   */
  public function isValid($name) {
    return array_key_exists($name, $this->getArrayCopy());
  }

  /**
   * @param string|int|float $name
   * @throws \InvalidArgumentException
   */
  public function assureIsValid($name) {
    if (!array_key_exists($name, $this->getArrayCopy())) {
      throw new \InvalidArgumentException(
        'Unknown name "'.$name.'" in '.static::className());
    }
  }

  /**
   * @param string|int|float $value
   * @return bool
   */
  public function isValidValue($value) {
    return array_key_exists($value, $this->getValuesMap());
  }

  /**
   * @param mixed $value
   * @throws \InvalidArgumentException
   */
  public function assureIsValidValue($value) {
    if (!$this->isValidValue($value)) {
      throw new \InvalidArgumentException(
        '"'.$value.'", not a valid value in '.static::className());
    }
  }
}