class InvocationMocker

final class InvocationMocker implements InvocationStubber, MethodNameMatch {
    private readonly InvocationHandler $invocationHandler;
    private readonly Matcher $matcher;
    
    /**
     * @psalm-var list<ConfigurableMethod>
     */
    private readonly array $configurableMethods;
    
    /**
     * @psalm-var ?array<string, int>
     */
    private ?array $configurableMethodNames = null;
    public function __construct(InvocationHandler $handler, Matcher $matcher, ConfigurableMethod ...$configurableMethods) {
        $this->invocationHandler = $handler;
        $this->matcher = $matcher;
        $this->configurableMethods = $configurableMethods;
    }
    
    /**
     * @throws MatcherAlreadyRegisteredException
     *
     * @return $this
     */
    public function id(string $id) : self {
        $this->invocationHandler
            ->registerMatcher($id, $this->matcher);
        return $this;
    }
    
    /**
     * @return $this
     */
    public function will(Stub $stub) : Identity {
        $this->matcher
            ->setStub($stub);
        return $this;
    }
    
    /**
     * @throws IncompatibleReturnValueException
     */
    public function willReturn(mixed $value, mixed ...$nextValues) : self {
        if (count($nextValues) === 0) {
            $this->ensureTypeOfReturnValues([
                $value,
            ]);
            $stub = $value instanceof Stub ? $value : new ReturnStub($value);
            return $this->will($stub);
        }
        $values = array_merge([
            $value,
        ], $nextValues);
        $this->ensureTypeOfReturnValues($values);
        $stub = new ConsecutiveCalls($values);
        return $this->will($stub);
    }
    public function willReturnReference(mixed &$reference) : self {
        $stub = new ReturnReference($reference);
        return $this->will($stub);
    }
    public function willReturnMap(array $valueMap) : self {
        $method = $this->configuredMethod();
        assert($method instanceof ConfigurableMethod);
        $numberOfParameters = $method->numberOfParameters();
        $defaultValues = $method->defaultParameterValues();
        $hasDefaultValues = !empty($defaultValues);
        $_valueMap = [];
        foreach ($valueMap as $mapping) {
            $numberOfConfiguredParameters = count($mapping) - 1;
            if ($numberOfConfiguredParameters === $numberOfParameters || !$hasDefaultValues) {
                $_valueMap[] = $mapping;
                continue;
            }
            $_mapping = [];
            $returnValue = array_pop($mapping);
            foreach (range(0, $numberOfParameters - 1) as $i) {
                if (isset($mapping[$i])) {
                    $_mapping[] = $mapping[$i];
                    continue;
                }
                if (isset($defaultValues[$i])) {
                    $_mapping[] = $defaultValues[$i];
                }
            }
            $_mapping[] = $returnValue;
            $_valueMap[] = $_mapping;
        }
        $stub = new ReturnValueMap($_valueMap);
        return $this->will($stub);
    }
    public function willReturnArgument(int $argumentIndex) : self {
        $stub = new ReturnArgument($argumentIndex);
        return $this->will($stub);
    }
    public function willReturnCallback(callable $callback) : self {
        $stub = new ReturnCallback($callback);
        return $this->will($stub);
    }
    public function willReturnSelf() : self {
        $stub = new ReturnSelf();
        return $this->will($stub);
    }
    public function willReturnOnConsecutiveCalls(mixed ...$values) : self {
        $stub = new ConsecutiveCalls($values);
        return $this->will($stub);
    }
    public function willThrowException(Throwable $exception) : self {
        $stub = new Exception($exception);
        return $this->will($stub);
    }
    
    /**
     * @return $this
     */
    public function after(string $id) : self {
        $this->matcher
            ->setAfterMatchBuilderId($id);
        return $this;
    }
    
    /**
     * @throws \PHPUnit\Framework\Exception
     * @throws MethodNameNotConfiguredException
     * @throws MethodParametersAlreadyConfiguredException
     *
     * @return $this
     */
    public function with(mixed ...$arguments) : self {
        $this->ensureParametersCanBeConfigured();
        $this->matcher
            ->setParametersRule(new Rule\Parameters($arguments));
        return $this;
    }
    
    /**
     * @throws MethodNameNotConfiguredException
     * @throws MethodParametersAlreadyConfiguredException
     *
     * @return $this
     */
    public function withAnyParameters() : self {
        $this->ensureParametersCanBeConfigured();
        $this->matcher
            ->setParametersRule(new Rule\AnyParameters());
        return $this;
    }
    
    /**
     * @throws InvalidArgumentException
     * @throws MethodCannotBeConfiguredException
     * @throws MethodNameAlreadyConfiguredException
     *
     * @return $this
     */
    public function method(Constraint|string $constraint) : self {
        if ($this->matcher
            ->hasMethodNameRule()) {
            throw new MethodNameAlreadyConfiguredException();
        }
        if (is_string($constraint)) {
            $this->configurableMethodNames ??= array_flip(array_map(static fn(ConfigurableMethod $configurable) => strtolower($configurable->name()), $this->configurableMethods));
            if (!array_key_exists(strtolower($constraint), $this->configurableMethodNames)) {
                throw new MethodCannotBeConfiguredException($constraint);
            }
        }
        $this->matcher
            ->setMethodNameRule(new Rule\MethodName($constraint));
        return $this;
    }
    
    /**
     * @throws MethodNameNotConfiguredException
     * @throws MethodParametersAlreadyConfiguredException
     */
    private function ensureParametersCanBeConfigured() : void {
        if (!$this->matcher
            ->hasMethodNameRule()) {
            throw new MethodNameNotConfiguredException();
        }
        if ($this->matcher
            ->hasParametersRule()) {
            throw new MethodParametersAlreadyConfiguredException();
        }
    }
    private function configuredMethod() : ?ConfigurableMethod {
        $configuredMethod = null;
        foreach ($this->configurableMethods as $configurableMethod) {
            if ($this->matcher
                ->methodNameRule()
                ->matchesName($configurableMethod->name())) {
                if ($configuredMethod !== null) {
                    return null;
                }
                $configuredMethod = $configurableMethod;
            }
        }
        return $configuredMethod;
    }
    
    /**
     * @throws IncompatibleReturnValueException
     */
    private function ensureTypeOfReturnValues(array $values) : void {
        $configuredMethod = $this->configuredMethod();
        if ($configuredMethod === null) {
            return;
        }
        foreach ($values as $value) {
            if (!$configuredMethod->mayReturn($value)) {
                throw new IncompatibleReturnValueException($configuredMethod, $value);
            }
        }
    }

}