<?php

namespace Acclimate\Container;

use Acclimate\Container\Exception\InvalidAdapterException;
use Psr\Container\ContainerInterface;

/**
 * This class is used to "acclimate", or adapt, a container object (e.g., DIC, SL) to a common ContainerInterface. In
 * terms of design patterns, it's essentially a `factory` for `adapter`s
 */
class ContainerAcclimator
{
	/** @var array Map of container classes to container adapter classes */
	private $adapterMap;


	/**
	 * Create an adaptor statically for a particular container.
	 *
	 * @param mixed $container A third-party object to be acclimated
	 * @param array|null $customAdapterMap An optional adapter map to pass to the acclimator
	 * @return ContainerInterface
	 */
	public static function acclimateContainer($container, array $customAdapterMap = null)
	{
		$acclimator = new self($customAdapterMap);

		return $acclimator->acclimate($container);
	}


	/**
	 * @param array $customAdapterMap Overwrite the predefined adapter map
	 */
	public function __construct(array $customAdapterMap = null)
	{
		$this->adapterMap = is_array($customAdapterMap) ? $customAdapterMap : include 'Adapter/map.php';
	}


	/**
	 * Registers a custom adapter for a class by mapping the fully qualified class name (FQCN) of one to the other
	 *
	 * @param string $adapterFqcn The FQCN of the adapter class
	 * @param string $adapteeFqcn The FQCN of the class being adapted
	 *
	 * @return ContainerAcclimator
	 */
	public function registerAdapter($adapterFqcn, $adapteeFqcn)
	{
		$this->adapterMap[$adapteeFqcn] = $adapterFqcn;

		return $this;
	}


	/**
	 * Adapts an object by wrapping it with a registered adapter class that implements an Acclimate interface
	 *
	 * @param mixed $adaptee A third-party object to be acclimated
	 *
	 * @return ContainerInterface
	 * @throws InvalidAdapterException if there is no adapter found for the provided object
	 */
	public function acclimate($adaptee)
	{
		if ($adaptee instanceof ContainerInterface) {
		    // If the adaptee already implements the ContainerInterface, just return it
		    return $adaptee;
		} else {
		    // Otherwise, check the adapter map to see if there is an appropriate adapter registered
		    foreach ($this->adapterMap as $adapteeFqcn => $adapterFqcn) {
		        if ($adaptee instanceof $adapteeFqcn) {
		            return new $adapterFqcn($adaptee);
		        }
		    }
		}

		// If no adapter matches the provided container object, throw an exception
		throw InvalidAdapterException::fromAdaptee($adaptee);
	}
}
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