<?php

/**
 * This file is part of the Nette Framework (http://nette.org)
 * Copyright (c) 2004 David Grudl (http://davidgrudl.com)
 */

namespace Nette\DI\Extensions;

use Nette,
	Nette\DI,
	Nette\DI\PhpReflection;


/**
 * Calls inject methods and fills @inject properties.
 *
 * @author     David Grudl
 */
class InjectExtension extends DI\CompilerExtension
{
	const TAG_INJECT = 'inject';


	public function beforeCompile()
	{
		foreach ($this->getContainerBuilder()->getDefinitions() as $def) {
			if ($def->getTag(self::TAG_INJECT) && $def->getClass()) {
				$this->updateDefinition($def);
			}
		}
	}


	private function updateDefinition($def)
	{
		$class = $def->getClass();
		$builder = $this->getContainerBuilder();
		$injects = array();
		foreach (self::getInjectProperties($class) as $property => $type) {
			self::checkType($class, $property, $type, $builder);
			$injects[] = new DI\Statement('$' . $property, array('@\\' . ltrim($type, '\\')));
		}

		foreach (self::getInjectMethods($def->getClass()) as $method) {
			$injects[] = new DI\Statement($method);
		}

		$setups = $def->getSetup();
		foreach ($injects as $inject) {
			foreach ($setups as $key => $setup) {
				if ($setup->getEntity() === $inject->getEntity()) {
					$inject = $setup;
					unset($setups[$key]);
				}
			}
			array_unshift($setups, $inject);
		}
		$def->setSetup($setups);
	}


	/**
	 * Generates list of inject methods.
	 * @return array
	 * @internal
	 */
	public static function getInjectMethods($class)
	{
		return array_values(array_filter(get_class_methods($class), function($name) {
			return substr($name, 0, 6) === 'inject';
		}));
	}


	/**
	 * Generates list of properties with annotation @inject.
	 * @return array
	 * @internal
	 */
	public static function getInjectProperties($class)
	{
		$res = array();
		foreach (get_class_vars($class) as $name => $foo) {
			$rp = new \ReflectionProperty($class, $name);
			if (PhpReflection::parseAnnotation($rp, 'inject') !== NULL) {
				if ($type = PhpReflection::parseAnnotation($rp, 'var')) {
					$type = PhpReflection::expandClassName($type, PhpReflection::getDeclaringClass($rp));
				}
				$res[$name] = $type;
			}
		}
		return $res;
	}


	/**
	 * Calls all methods starting with with "inject" using autowiring.
	 * @return void
	 */
	public static function callInjects(DI\Container $container, $service)
	{
		if (!is_object($service)) {
			throw new Nette\InvalidArgumentException(sprintf('Service must be object, %s given.', gettype($service)));
		}

		foreach (array_reverse(self::getInjectMethods($service)) as $method) {
			$container->callMethod(array($service, $method));
		}

		foreach (self::getInjectProperties(get_class($service)) as $property => $type) {
			self::checkType($service, $property, $type, $container);
			$service->$property = $container->getByType($type);
		}
	}


	/** @internal */
	private static function checkType($class, $name, $type, $container)
	{
		$rc = PhpReflection::getDeclaringClass(new \ReflectionProperty($class, $name));
		$fullname = $rc->getName() . '::$' . $name;
		if (!$type) {
			throw new Nette\InvalidStateException("Property $fullname has no @var annotation.");
		} elseif (!class_exists($type) && !interface_exists($type)) {
			throw new Nette\InvalidStateException("Class or interface '$type' used in @var annotation at $fullname not found. Check annotation and 'use' statements.");
		} elseif (!$container->getByType($type, FALSE)) {
			throw new Nette\InvalidStateException("Service of type {$type} used in @var annotation at $fullname not found. Did you register it in configuration file?");
		}
	}

}
