more self explanatory message for factory and service mismatch (closes #199) (#284)

Author: dg

src/DI/Definitions/FactoryDefinition.php

@@ -216,12 +216,22 @@ private function completeParameters(Nette\DI\Resolver $resolver): void
 				$this->resultDefinition->getCreator()->arguments[$ctorParam->getPosition()] = new Php\Literal('$' . $ctorParam->name);
 
 			} elseif (!$this->resultDefinition->getSetup()) {
-				$hint = Nette\Utils\Helpers::getSuggestion(array_keys($ctorParams), $param->name);
+				// [param1, param2] => '$param1, $param2'
+				$stringifyParams = function (array $params): string {
+					return implode(', ', array_map(
+						function (string $param) { return sprintf('$%s', $param); },
+						$params
+					));
+				};
+				$ctorParamsKeys = array_keys($ctorParams);
+				$hint = Nette\Utils\Helpers::getSuggestion($ctorParamsKeys, $param->name);
 				throw new ServiceCreationException(sprintf(
-					'Unused parameter $%s when implementing method %s::create()',
-					$param->name,
-					$interface
-				) . ($hint ? ", did you mean \${$hint}?" : '.'));
+					'Cannot implement %s::create(): factory method parameters (%s) are not matching %s::__construct() parameters (%s).',
+					$interface,
+					$stringifyParams(array_map(function (\ReflectionParameter $param) { return $param->name; }, $method->getParameters())),
+					$class,
+					$stringifyParams($ctorParamsKeys)
+				) . ($hint ? " Did you mean to use '\${$hint}' in factory method?" : ''));
 			}
 
 			$paramDef = $methodType . ' ' . $param->name;

tests/DI/Compiler.generatedFactory.phpt

@@ -302,7 +302,7 @@ Assert::exception(function () {
 	$builder->addFactoryDefinition('one')
 		->setImplement(Bad4::class);
 	$builder->complete();
-}, Nette\InvalidStateException::class, "Service 'one' (type of Bad4): Unused parameter \$baz when implementing method Bad4::create(), did you mean \$bar?");
+}, Nette\InvalidStateException::class, "Service 'one' (type of Bad4): Cannot implement Bad4::create(): factory method parameters (\$baz) are not matching Bad3::__construct() parameters (\$bar). Did you mean to use '\$bar' in factory method?");
 
 
 
@@ -323,7 +323,7 @@ Assert::exception(function () {
 	$builder->addFactoryDefinition('one')
 		->setImplement(Bad6::class);
 	$builder->complete();
-}, Nette\InvalidStateException::class, "Service 'one' (type of Bad6): Unused parameter \$baz when implementing method Bad6::create().");
+}, Nette\InvalidStateException::class, "Service 'one' (type of Bad6): Cannot implement Bad6::create(): factory method parameters (\$baz) are not matching Bad5::__construct() parameters (\$xxx).");