<?php
 
 namespace Illuminate\Container;
 
 use Closure;
 use ReflectionMethod;
 use ReflectionFunction;
 use InvalidArgumentException;
 
 class BoundMethod
 {
     /**
      * Call the given Closure / class@method and inject its dependencies.
      *
      * @param  \Illuminate\Container\Container  $container
      * @param  callable|string  $callback
      * @param  array  $parameters
      * @param  string|null  $defaultMethod
      * @return mixed
      *
      * @throws \ReflectionException
      * @throws \InvalidArgumentException
      */
     public static function call($container, $callback, array $parameters = [], $defaultMethod = null)
     {
         if (static::isCallableWithAtSign($callback) || $defaultMethod) {
             return static::callClass($container, $callback, $parameters, $defaultMethod);
         }
 
         return static::callBoundMethod($container, $callback, function () use ($container, $callback, $parameters) {
             return call_user_func_array(
                 $callback, static::getMethodDependencies($container, $callback, $parameters)
             );
         });
     }
 
     /**
      * Call a string reference to a class using Class@method syntax.
      *
      * @param  \Illuminate\Container\Container  $container
      * @param  string  $target
      * @param  array  $parameters
      * @param  string|null  $defaultMethod
      * @return mixed
      *
      * @throws \InvalidArgumentException
      */
     protected static function callClass($container, $target, array $parameters = [], $defaultMethod = null)
     {
         $segments = explode('@', $target);
 
         // We will assume an @ sign is used to delimit the class name from the method
         // name. We will split on this @ sign and then build a callable array that
         // we can pass right back into the "call" method for dependency binding.
         $method = count($segments) === 2
                         ? $segments[1] : $defaultMethod;
 
         if (is_null($method)) {
             throw new InvalidArgumentException('Method not provided.');
         }
 
         return static::call(
             $container, [$container->make($segments[0]), $method], $parameters
         );
     }
 
     /**
      * Call a method that has been bound to the container.
      *
      * @param  \Illuminate\Container\Container  $container
      * @param  callable  $callback
      * @param  mixed  $default
      * @return mixed
      */
     protected static function callBoundMethod($container, $callback, $default)
     {
         if (! is_array($callback)) {
             return $default instanceof Closure ? $default() : $default;
         }
 
         // Here we need to turn the array callable into a Class@method string we can use to
         // examine the container and see if there are any method bindings for this given
         // method. If there are, we can call this method binding callback immediately.
         $method = static::normalizeMethod($callback);
 
         if ($container->hasMethodBinding($method)) {
             return $container->callMethodBinding($method, $callback[0]);
         }
 
         return $default instanceof Closure ? $default() : $default;
     }
 
     /**
      * Normalize the given callback into a Class@method string.
      *
      * @param  callable  $callback
      * @return string
      */
     protected static function normalizeMethod($callback)
     {
         $class = is_string($callback[0]) ? $callback[0] : get_class($callback[0]);
 
         return "{$class}@{$callback[1]}";
     }
 
     /**
      * Get all dependencies for a given method.
      *
      * @param  \Illuminate\Container\Container  $container
      * @param  callable|string  $callback
      * @param  array  $parameters
      * @return array
      *
      * @throws \ReflectionException
      */
     protected static function getMethodDependencies($container, $callback, array $parameters = [])
     {
         $dependencies = [];
 
         foreach (static::getCallReflector($callback)->getParameters() as $parameter) {
             static::addDependencyForCallParameter($container, $parameter, $parameters, $dependencies);
         }
 
         return array_merge($dependencies, $parameters);
     }
 
     /**
      * Get the proper reflection instance for the given callback.
      *
      * @param  callable|string $callback
      * @return \ReflectionFunctionAbstract
      *
      * @throws \ReflectionException
      */
     protected static function getCallReflector($callback)
     {
         if (is_string($callback) && strpos($callback, '::') !== false) {
             $callback = explode('::', $callback);
         }
 
         return is_array($callback)
                         ? new ReflectionMethod($callback[0], $callback[1])
                         : new ReflectionFunction($callback);
     }
 
     /**
      * Get the dependency for the given call parameter.
      *
      * @param  \Illuminate\Container\Container  $container
      * @param  \ReflectionParameter  $parameter
      * @param  array  $parameters
      * @param  array  $dependencies
      * @return void
      */
     protected static function addDependencyForCallParameter($container, $parameter,
                                                             array &$parameters, &$dependencies)
     {
         if (array_key_exists($parameter->name, $parameters)) {
             $dependencies[] = $parameters[$parameter->name];
 
             unset($parameters[$parameter->name]);
         } elseif ($parameter->getClass() && array_key_exists($parameter->getClass()->name, $parameters)) {
             $dependencies[] = $parameters[$parameter->getClass()->name];
 
             unset($parameters[$parameter->getClass()->name]);
         } elseif ($parameter->getClass()) {
             $dependencies[] = $container->make($parameter->getClass()->name);
         } elseif ($parameter->isDefaultValueAvailable()) {
             $dependencies[] = $parameter->getDefaultValue();
         }
     }
 
     /**
      * Determine if the given string is in Class@method syntax.
      *
      * @param  mixed  $callback
      * @return bool
      */
     protected static function isCallableWithAtSign($callback)
     {
         return is_string($callback) && strpos($callback, '@') !== false;
     }
 }