class MockMethod

final class MockMethod {
    use TemplateLoader;
    
    /**
     * @psalm-var class-string
     */
    private readonly string $className;
    
    /**
     * @psalm-var non-empty-string
     */
    private readonly string $methodName;
    private readonly bool $cloneArguments;
    private readonly string $modifier;
    private readonly string $argumentsForDeclaration;
    private readonly string $argumentsForCall;
    private readonly Type $returnType;
    private readonly string $reference;
    private readonly bool $callOriginalMethod;
    private readonly bool $static;
    private readonly ?string $deprecation;
    
    /**
     * @psalm-var array<int, mixed>
     */
    private readonly array $defaultParameterValues;
    
    /**
     * @psalm-var non-negative-int
     */
    private readonly int $numberOfParameters;
    
    /**
     * @throws ReflectionException
     * @throws RuntimeException
     */
    public static function fromReflection(ReflectionMethod $method, bool $callOriginalMethod, bool $cloneArguments) : self {
        if ($method->isPrivate()) {
            $modifier = 'private';
        }
        elseif ($method->isProtected()) {
            $modifier = 'protected';
        }
        else {
            $modifier = 'public';
        }
        if ($method->isStatic()) {
            $modifier .= ' static';
        }
        if ($method->returnsReference()) {
            $reference = '&';
        }
        else {
            $reference = '';
        }
        $docComment = $method->getDocComment();
        if (is_string($docComment) && preg_match('#\\*[ \\t]*+@deprecated[ \\t]*+(.*?)\\r?+\\n[ \\t]*+\\*(?:[ \\t]*+@|/$)#s', $docComment, $deprecation)) {
            $deprecation = trim(preg_replace('#[ \\t]*\\r?\\n[ \\t]*+\\*[ \\t]*+#', ' ', $deprecation[1]));
        }
        else {
            $deprecation = null;
        }
        return new self($method->getDeclaringClass()
            ->getName(), $method->getName(), $cloneArguments, $modifier, self::methodParametersForDeclaration($method), self::methodParametersForCall($method), self::methodParametersDefaultValues($method), count($method->getParameters()), (new ReflectionMapper())->fromReturnType($method), $reference, $callOriginalMethod, $method->isStatic(), $deprecation);
    }
    
    /**
     * @param class-string     $className
     * @param non-empty-string $methodName
     */
    public static function fromName(string $className, string $methodName, bool $cloneArguments) : self {
        return new self($className, $methodName, $cloneArguments, 'public', '', '', [], 0, new UnknownType(), '', false, false, null);
    }
    
    /**
     * @psalm-param class-string $className
     * @psalm-param non-empty-string $methodName
     * @psalm-param array<int, mixed> $defaultParameterValues
     * @psalm-param non-negative-int $numberOfParameters
     */
    private function __construct(string $className, string $methodName, bool $cloneArguments, string $modifier, string $argumentsForDeclaration, string $argumentsForCall, array $defaultParameterValues, int $numberOfParameters, Type $returnType, string $reference, bool $callOriginalMethod, bool $static, ?string $deprecation) {
        $this->className = $className;
        $this->methodName = $methodName;
        $this->cloneArguments = $cloneArguments;
        $this->modifier = $modifier;
        $this->argumentsForDeclaration = $argumentsForDeclaration;
        $this->argumentsForCall = $argumentsForCall;
        $this->defaultParameterValues = $defaultParameterValues;
        $this->numberOfParameters = $numberOfParameters;
        $this->returnType = $returnType;
        $this->reference = $reference;
        $this->callOriginalMethod = $callOriginalMethod;
        $this->static = $static;
        $this->deprecation = $deprecation;
    }
    
    /**
     * @psalm-return non-empty-string
     */
    public function methodName() : string {
        return $this->methodName;
    }
    
    /**
     * @throws RuntimeException
     */
    public function generateCode() : string {
        if ($this->static) {
            $templateFile = 'doubled_static_method.tpl';
        }
        else {
            $templateFile = sprintf('%s_method.tpl', $this->callOriginalMethod ? 'proxied' : 'doubled');
        }
        $deprecation = $this->deprecation;
        $returnResult = '';
        if (!$this->returnType
            ->isNever() && !$this->returnType
            ->isVoid()) {
            $returnResult = <<<'EOT'


        return $__phpunit_result;
EOT;
        }
        if (null !== $this->deprecation) {
            $deprecation = "The {$this->className}::{$this->methodName} method is deprecated ({$this->deprecation}).";
            $deprecationTemplate = $this->loadTemplate('deprecation.tpl');
            $deprecationTemplate->setVar([
                'deprecation' => var_export($deprecation, true),
            ]);
            $deprecation = $deprecationTemplate->render();
        }
        $template = $this->loadTemplate($templateFile);
        $argumentsCount = 0;
        if (str_contains($this->argumentsForCall, '...')) {
            $argumentsCount = null;
        }
        elseif (!empty($this->argumentsForCall)) {
            $argumentsCount = substr_count($this->argumentsForCall, ',') + 1;
        }
        $template->setVar([
            'arguments_decl' => $this->argumentsForDeclaration,
            'arguments_call' => $this->argumentsForCall,
            'return_declaration' => !empty($this->returnType
                ->asString()) ? ': ' . $this->returnType
                ->asString() : '',
            'return_type' => $this->returnType
                ->asString(),
            'arguments_count' => $argumentsCount,
            'class_name' => $this->className,
            'method_name' => $this->methodName,
            'modifier' => $this->modifier,
            'reference' => $this->reference,
            'clone_arguments' => $this->cloneArguments ? 'true' : 'false',
            'deprecation' => $deprecation,
            'return_result' => $returnResult,
        ]);
        return $template->render();
    }
    public function returnType() : Type {
        return $this->returnType;
    }
    
    /**
     * @psalm-return array<int, mixed>
     */
    public function defaultParameterValues() : array {
        return $this->defaultParameterValues;
    }
    
    /**
     * @psalm-return non-negative-int
     */
    public function numberOfParameters() : int {
        return $this->numberOfParameters;
    }
    
    /**
     * Returns the parameters of a function or method.
     *
     * @throws RuntimeException
     */
    private static function methodParametersForDeclaration(ReflectionMethod $method) : string {
        $parameters = [];
        $types = (new ReflectionMapper())->fromParameterTypes($method);
        foreach ($method->getParameters() as $i => $parameter) {
            $name = '$' . $parameter->getName();
            
            /* Note: PHP extensions may use empty names for reference arguments
             * or "..." for methods taking a variable number of arguments.
             */
            if ($name === '$' || $name === '$...') {
                $name = '$arg' . $i;
            }
            $default = '';
            $reference = '';
            $typeDeclaration = '';
            if (!$types[$i]->type()
                ->isUnknown()) {
                $typeDeclaration = $types[$i]->type()
                    ->asString() . ' ';
            }
            if ($parameter->isPassedByReference()) {
                $reference = '&';
            }
            if ($parameter->isVariadic()) {
                $name = '...' . $name;
            }
            elseif ($parameter->isDefaultValueAvailable()) {
                $default = ' = ' . self::exportDefaultValue($parameter);
            }
            elseif ($parameter->isOptional()) {
                $default = ' = null';
            }
            $parameters[] = $typeDeclaration . $reference . $name . $default;
        }
        return implode(', ', $parameters);
    }
    
    /**
     * Returns the parameters of a function or method.
     *
     * @throws ReflectionException
     */
    private static function methodParametersForCall(ReflectionMethod $method) : string {
        $parameters = [];
        foreach ($method->getParameters() as $i => $parameter) {
            $name = '$' . $parameter->getName();
            
            /* Note: PHP extensions may use empty names for reference arguments
             * or "..." for methods taking a variable number of arguments.
             */
            if ($name === '$' || $name === '$...') {
                $name = '$arg' . $i;
            }
            if ($parameter->isVariadic()) {
                continue;
            }
            if ($parameter->isPassedByReference()) {
                $parameters[] = '&' . $name;
            }
            else {
                $parameters[] = $name;
            }
        }
        return implode(', ', $parameters);
    }
    
    /**
     * @throws ReflectionException
     */
    private static function exportDefaultValue(ReflectionParameter $parameter) : string {
        try {
            $defaultValue = $parameter->getDefaultValue();
            if (!is_object($defaultValue)) {
                return var_export($defaultValue, true);
            }
            $parameterAsString = $parameter->__toString();
            return explode(' = ', substr(substr($parameterAsString, strpos($parameterAsString, '<optional> ') + strlen('<optional> ')), 0, -2))[1];
            // @codeCoverageIgnoreStart
        } catch (\ReflectionException $e) {
            throw new ReflectionException($e->getMessage(), $e->getCode(), $e);
        }
        // @codeCoverageIgnoreEnd
    }
    
    /**
     * @psalm-return array<int, mixed>
     */
    private static function methodParametersDefaultValues(ReflectionMethod $method) : array {
        $result = [];
        foreach ($method->getParameters() as $i => $parameter) {
            if (!$parameter->isDefaultValueAvailable()) {
                continue;
            }
            $result[$i] = $parameter->getDefaultValue();
        }
        return $result;
    }

}