<?php

declare(strict_types=1);

namespace ProxyManagerTest\Functional;

use Generator;
use PHPUnit\Framework\ExpectationFailedException;
use PHPUnit\Framework\TestCase;
use ProxyManager\Factory\AccessInterceptorValueHolderFactory;
use ProxyManager\Proxy\AccessInterceptorInterface;
use ProxyManager\Proxy\AccessInterceptorValueHolderInterface;
use ProxyManagerTest\Assert;
use ProxyManagerTestAsset\BaseClass;
use ProxyManagerTestAsset\CallableInterface;
use ProxyManagerTestAsset\ClassWithCounterConstructor;
use ProxyManagerTestAsset\ClassWithDynamicArgumentsMethod;
use ProxyManagerTestAsset\ClassWithMethodWithByRefVariadicFunction;
use ProxyManagerTestAsset\ClassWithMethodWithVariadicFunction;
use ProxyManagerTestAsset\ClassWithParentHint;
use ProxyManagerTestAsset\ClassWithPublicArrayPropertyAccessibleViaMethod;
use ProxyManagerTestAsset\ClassWithPublicProperties;
use ProxyManagerTestAsset\ClassWithPublicStringNullableTypedProperty;
use ProxyManagerTestAsset\ClassWithPublicStringTypedProperty;
use ProxyManagerTestAsset\ClassWithSelfHint;
use ProxyManagerTestAsset\EmptyClass;
use ProxyManagerTestAsset\OtherObjectAccessClass;
use ProxyManagerTestAsset\ReferenceIncrementDecrementClass;
use ProxyManagerTestAsset\VoidCounter;
use ReflectionClass;
use ReflectionProperty;
use stdClass;

use function array_values;
use function assert;
use function get_class;
use function is_callable;
use function random_int;
use function serialize;
use function ucfirst;
use function uniqid;
use function unserialize;

/**
 * Tests for {@see \ProxyManager\ProxyGenerator\LazyLoadingValueHolderGenerator} produced objects
 *
 * @group Functional
 * @coversNothing
 */
final class AccessInterceptorValueHolderFunctionalTest extends TestCase
{
    /**
     * @param mixed[] $params
     *
     * @dataProvider getProxyMethods
     */
    public function testMethodCalls($instance, string $method, array $params, $expectedValue): void
    {
        $proxy    = (new AccessInterceptorValueHolderFactory())->createProxy($instance);
        $callback = [$proxy, $method];

        self::assertIsCallable($callback);
        self::assertSame($instance, $proxy->getWrappedValueHolderValue());
        self::assertSame($expectedValue, $callback(...array_values($params)));

        $listener = $this->createMock(CallableInterface::class);
        $listener
            ->expects(self::once())
            ->method('__invoke')
            ->with($proxy, $instance, $method, $params, false);

        $proxy->setMethodPrefixInterceptor(
            $method,
            static function (
                AccessInterceptorInterface $proxy,
                $instance,
                string $method,
                array $params,
                bool & $returnEarly
            ) use ($listener): void {
                $listener->__invoke($proxy, $instance, $method, $params, $returnEarly);
            }
        );

        self::assertSame($expectedValue, $callback(...array_values($params)));

        $random = uniqid('', true);

        $proxy->setMethodPrefixInterceptor(
            $method,
            static function (
                AccessInterceptorInterface $proxy,
                $instance,
                string $method,
                array $params,
                bool & $returnEarly
            ) use ($random): string {
                $returnEarly = true;

                return $random;
            }
        );

        self::assertSame($random, $callback(...array_values($params)));
    }

    /**
     * @param mixed[] $params
     *
     * @dataProvider getProxyMethods
     */
    public function testMethodCallsWithSuffixListener(
        $instance,
        string $method,
        array $params,
        $expectedValue
    ): void {
        $proxy    = (new AccessInterceptorValueHolderFactory())->createProxy($instance);
        $callback = [$proxy, $method];

        self::assertIsCallable($callback);

        $listener = $this->createMock(CallableInterface::class);
        $listener
            ->expects(self::once())
            ->method('__invoke')
            ->with($proxy, $instance, $method, $params, $expectedValue, false);

        $proxy->setMethodSuffixInterceptor(
            $method,
            /** @param mixed $returnValue */
            static function (
                AccessInterceptorInterface $proxy,
                $instance,
                string $method,
                array $params,
                $returnValue,
                bool & $returnEarly
            ) use ($listener): void {
                $listener->__invoke($proxy, $instance, $method, $params, $returnValue, $returnEarly);
            }
        );

        self::assertSame($expectedValue, $callback(...array_values($params)));

        $random = uniqid('', true);

        $proxy->setMethodSuffixInterceptor(
            $method,
            /** @param mixed $returnValue */
            static function (
                AccessInterceptorInterface $proxy,
                $instance,
                string $method,
                array $params,
                $returnValue,
                bool & $returnEarly
            ) use ($random): string {
                $returnEarly = true;

                return $random;
            }
        );

        self::assertSame($random, $callback(...array_values($params)));
    }

    /**
     * @param mixed[] $params
     *
     * @dataProvider getProxyMethods
     */
    public function testMethodCallsAfterUnSerialization(
        $instance,
        string $method,
        array $params,
        $expectedValue
    ): void {
        $proxy = unserialize(serialize((new AccessInterceptorValueHolderFactory())->createProxy($instance)));
        assert($proxy instanceof AccessInterceptorValueHolderInterface);
        $callback = [$proxy, $method];

        self::assertIsCallable($callback);
        self::assertSame($expectedValue, $callback(...array_values($params)));
        self::assertEquals($instance, $proxy->getWrappedValueHolderValue());
    }

    /**
     * @param mixed[] $params
     *
     * @dataProvider getProxyMethods
     */
    public function testMethodCallsAfterCloning(
        $instance,
        string $method,
        array $params,
        $expectedValue
    ): void {
        $proxy    = (new AccessInterceptorValueHolderFactory())->createProxy($instance);
        $cloned   = clone $proxy;
        $callback = [$cloned, $method];

        self::assertIsCallable($callback);
        self::assertNotSame($proxy->getWrappedValueHolderValue(), $cloned->getWrappedValueHolderValue());
        self::assertSame($expectedValue, $callback(...array_values($params)));
        self::assertEquals($instance, $cloned->getWrappedValueHolderValue());
    }

    /**
     * @dataProvider getPropertyAccessProxies
     */
    public function testPropertyReadAccess(
        $instance,
        AccessInterceptorValueHolderInterface $proxy,
        string $publicProperty,
        $propertyValue
    ): void {
        self::assertSame($propertyValue, $proxy->$publicProperty);
        self::assertEquals($instance, $proxy->getWrappedValueHolderValue());
    }

    /**
     * @dataProvider getPropertyAccessProxies
     */
    public function testPropertyWriteAccess(
        $instance,
        AccessInterceptorValueHolderInterface $proxy,
        string $publicProperty
    ): void {
        $newValue               = uniqid('', true);
        $proxy->$publicProperty = $newValue;

        self::assertSame($newValue, $proxy->$publicProperty);

        $wrappedValue = $proxy->getWrappedValueHolderValue();

        self::assertNotNull($wrappedValue);
        self::assertSame($newValue, $wrappedValue->$publicProperty);
    }

    /**
     * @dataProvider getPropertyAccessProxies
     */
    public function testPropertyExistence(
        $instance,
        AccessInterceptorValueHolderInterface $proxy,
        string $publicProperty
    ): void {
        self::assertSame(isset($instance->$publicProperty), isset($proxy->$publicProperty));
        self::assertEquals($instance, $proxy->getWrappedValueHolderValue());

        $propertyType = \PHP_VERSION_ID >= 70400 ? (new ReflectionProperty($instance, $publicProperty))->getType() : null;

        if ($propertyType !== null && ! $propertyType->allowsNull()) {
            return;
        }

        $proxy->getWrappedValueHolderValue()->$publicProperty = null;
        self::assertFalse(isset($proxy->$publicProperty));
    }

    /**
     * @dataProvider getPropertyAccessProxies
     */
    public function testPropertyUnset(
        $instance,
        AccessInterceptorValueHolderInterface $proxy,
        string $publicProperty
    ): void {
        $instance = $proxy->getWrappedValueHolderValue() ?? $instance;
        unset($proxy->$publicProperty);

        self::assertFalse(isset($instance->$publicProperty));
        self::assertFalse(isset($proxy->$publicProperty));
    }

    /**
     * Verifies that accessing a public property containing an array behaves like in a normal context
     */
    public function testCanWriteToArrayKeysInPublicProperty(): void
    {
        $instance = new ClassWithPublicArrayPropertyAccessibleViaMethod();
        $proxy    = (new AccessInterceptorValueHolderFactory())->createProxy($instance);

        $proxy->arrayProperty['foo'] = 'bar';

        self::assertSame('bar', $proxy->getArrayProperty()['foo']);

        $proxy->arrayProperty = ['tab' => 'taz'];

        self::assertSame(['tab' => 'taz'], $proxy->getArrayProperty());
    }

    /**
     * Verifies that public properties retrieved via `__get` don't get modified in the object state
     */
    public function testWillNotModifyRetrievedPublicProperties(): void
    {
        $instance = new ClassWithPublicProperties();
        $proxy    = (new AccessInterceptorValueHolderFactory())->createProxy($instance);
        $variable = $proxy->property0;

        self::assertByRefVariableValueSame('property0', $variable);

        $variable = 'foo';

        self::assertSame('property0', $proxy->property0);
        self::assertByRefVariableValueSame('foo', $variable);
    }

    /**
     * Verifies that public properties references retrieved via `__get` modify in the object state
     */
    public function testWillModifyByRefRetrievedPublicProperties(): void
    {
        $instance = new ClassWithPublicProperties();
        $proxy    = (new AccessInterceptorValueHolderFactory())->createProxy($instance);
        $variable = & $proxy->property0;

        self::assertByRefVariableValueSame('property0', $variable);

        $variable = 'foo';

        self::assertSame('foo', $proxy->property0);
        self::assertByRefVariableValueSame('foo', $variable);
    }

    /**
     * @group 115
     * @group 175
     */
    public function testWillBehaveLikeObjectWithNormalConstructor(): void
    {
        $instance = new ClassWithCounterConstructor(10);

        self::assertSame(10, $instance->amount, 'Verifying that test asset works as expected');
        self::assertSame(10, $instance->getAmount(), 'Verifying that test asset works as expected');
        $instance->__construct(3);
        self::assertSame(13, $instance->amount, 'Verifying that test asset works as expected');
        self::assertSame(13, $instance->getAmount(), 'Verifying that test asset works as expected');

        $proxyName = get_class(
            (new AccessInterceptorValueHolderFactory())
                ->createProxy(new ClassWithCounterConstructor(0))
        );

        /** @psalm-suppress UnsafeInstantiation it is allowed (by design) to instantiate these proxies */
        $proxy = new $proxyName(15);

        self::assertSame(15, $proxy->amount, 'Verifying that the proxy constructor works as expected');
        self::assertSame(15, $proxy->getAmount(), 'Verifying that the proxy constructor works as expected');
        $proxy->__construct(5);
        self::assertSame(20, $proxy->amount, 'Verifying that the proxy constructor works as expected');
        self::assertSame(20, $proxy->getAmount(), 'Verifying that the proxy constructor works as expected');
    }

    public function testWillForwardVariadicArguments(): void
    {
        $factory      = new AccessInterceptorValueHolderFactory();
        $targetObject = new ClassWithMethodWithVariadicFunction();

        $object = $factory->createProxy(
            $targetObject,
            [
                'bar' => static function (): string {
                    return 'Foo Baz';
                },
            ]
        );

        self::assertNull($object->bar);
        self::assertNull($object->baz);

        $object->foo('Ocramius', 'Malukenho', 'Danizord');
        self::assertSame('Ocramius', $object->bar);
        self::assertSame(['Malukenho', 'Danizord'], Assert::readAttribute($object, 'baz'));
    }

    /**
     * @group 265
     */
    public function testWillForwardVariadicByRefArguments(): void
    {
        $object = (new AccessInterceptorValueHolderFactory())->createProxy(
            new ClassWithMethodWithByRefVariadicFunction(),
            [
                'bar' => static function (): string {
                    return 'Foo Baz';
                },
            ]
        );

        $arguments = ['Ocramius', 'Malukenho', 'Danizord'];

        self::assertSame(
            ['Ocramius', 'changed', 'Danizord'],
            (new ClassWithMethodWithByRefVariadicFunction())->tuz(...$arguments),
            'Verifying that the implementation of the test asset is correct before proceeding'
        );
        self::assertSame(['Ocramius', 'changed', 'Danizord'], $object->tuz(...$arguments));
        self::assertSame(['Ocramius', 'changed', 'Danizord'], $arguments, 'By-ref arguments were changed');
    }

    /**
     * This test documents a known limitation: `func_get_args()` (and similars) don't work in proxied APIs.
     * If you manage to make this test pass, then please do send a patch
     *
     * @group 265
     */
    public function testWillNotForwardDynamicArguments(): void
    {
        $object = (new AccessInterceptorValueHolderFactory())->createProxy(new ClassWithDynamicArgumentsMethod());

        self::assertSame(['a', 'b'], (new ClassWithDynamicArgumentsMethod())->dynamicArgumentsMethod('a', 'b'));

        $this->expectException(ExpectationFailedException::class);

        self::assertSame(['a', 'b'], $object->dynamicArgumentsMethod('a', 'b'));
    }

    /**
     * Generates a list of object | invoked method | parameters | expected result
     *
     * @return string[][]|object[][]|mixed[][]
     */
    public function getProxyMethods(): array
    {
        $selfHintParam = new ClassWithSelfHint();
        $empty         = new EmptyClass();

        return [
            [
                new BaseClass(),
                'publicMethod',
                [],
                'publicMethodDefault',
            ],
            [
                new BaseClass(),
                'publicTypeHintedMethod',
                ['param' => new stdClass()],
                'publicTypeHintedMethodDefault',
            ],
            [
                new BaseClass(),
                'publicByReferenceMethod',
                [],
                'publicByReferenceMethodDefault',
            ],
            [
                new BaseClass(),
                'publicMethod',
                [],
                'publicMethodDefault',
            ],
            [
                new ClassWithSelfHint(),
                'selfHintMethod',
                ['parameter' => $selfHintParam],
                $selfHintParam,
            ],
            [
                new ClassWithParentHint(),
                'parentHintMethod',
                ['parameter' => $empty],
                $empty,
            ],
        ];
    }

    /**
     * Generates proxies and instances with a public property to feed to the property accessor methods
     *
     * @return array<int, array<int, object|AccessInterceptorValueHolderInterface|string>>
     */
    public function getPropertyAccessProxies(): array
    {
        $instance1             = new BaseClass();
        $instance2             = new BaseClass();

        $factory = new AccessInterceptorValueHolderFactory();

        $serialized = unserialize(serialize($factory->createProxy($instance2)));
        assert($serialized instanceof AccessInterceptorValueHolderInterface);

        $tests = [
            [
                $instance1,
                $factory->createProxy($instance1),
                'publicProperty',
                'publicPropertyDefault',
            ],
            [
                $instance2,
                $serialized,
                'publicProperty',
                'publicPropertyDefault',
            ],
        ];

        if (\PHP_VERSION_ID < 70400) {
            return $tests;
        }

        $typedProperty         = new ClassWithPublicStringTypedProperty();
        $typedNullableProperty = new ClassWithPublicStringNullableTypedProperty();

        $typedProperty->typedProperty                 = 'Typed property initialized value';
        $typedNullableProperty->typedNullableProperty = 'Typed nullable property initialized value';

        return array_merge($tests, [
            [
                $typedProperty,
                $factory->createProxy($typedProperty),
                'typedProperty',
                'Typed property initialized value',
            ],
            [
                $typedNullableProperty,
                $factory->createProxy($typedNullableProperty),
                'typedNullableProperty',
                'Typed nullable property initialized value',
            ],
        ]);
    }

    /**
     * @group        276
     * @dataProvider getMethodsThatAccessPropertiesOnOtherObjectsInTheSameScope
     */
    public function testWillInterceptAccessToPropertiesViaFriendClassAccess(
        $callerObject,
        $realInstance,
        string $method,
        string $expectedValue,
        string $propertyName
    ): void {
        $proxy    = (new AccessInterceptorValueHolderFactory())->createProxy($realInstance);
        $listener = $this->createMock(CallableInterface::class);

        $listener
            ->expects(self::once())
            ->method('__invoke')
            ->with($proxy, $realInstance, '__get', ['name' => $propertyName]);

        $proxy->setMethodPrefixInterceptor(
            '__get',
            static function ($proxy, $instance, string $method, array $params, bool & $returnEarly) use ($listener): void {
                $listener->__invoke($proxy, $instance, $method, $params, $returnEarly);
            }
        );

        $accessor = [$callerObject, $method];
        assert(is_callable($accessor));

        self::assertSame($expectedValue, $accessor($proxy));
    }

    /**
     * @group        276
     * @dataProvider getMethodsThatAccessPropertiesOnOtherObjectsInTheSameScope
     */
    public function testWillInterceptAccessToPropertiesViaFriendClassAccessEvenIfDeSerialized(
        $callerObject,
        $realInstance,
        string $method,
        string $expectedValue,
        string $propertyName
    ): void {
        $proxy = unserialize(serialize((new AccessInterceptorValueHolderFactory())->createProxy($realInstance)));
        assert($proxy instanceof AccessInterceptorValueHolderInterface);
        $listener = $this->createMock(CallableInterface::class);

        $listener
            ->expects(self::once())
            ->method('__invoke')
            ->with($proxy, $realInstance, '__get', ['name' => $propertyName]);

        $proxy->setMethodPrefixInterceptor(
            '__get',
            static function ($proxy, $instance, string $method, array $params, bool & $returnEarly) use ($listener): void {
                $listener->__invoke($proxy, $instance, $method, $params, $returnEarly);
            }
        );

        $accessor = [$callerObject, $method];
        assert(is_callable($accessor));

        self::assertSame($expectedValue, $accessor($proxy));
    }

    /**
     * @group        276
     * @dataProvider getMethodsThatAccessPropertiesOnOtherObjectsInTheSameScope
     */
    public function testWillInterceptAccessToPropertiesViaFriendClassAccessEvenIfCloned(
        $callerObject,
        $realInstance,
        string $method,
        string $expectedValue,
        string $propertyName
    ): void {
        $proxy = clone (new AccessInterceptorValueHolderFactory())->createProxy($realInstance);

        $listener = $this->createMock(CallableInterface::class);

        $listener
            ->expects(self::once())
            ->method('__invoke')
            ->with($proxy, $realInstance, '__get', ['name' => $propertyName]);

        $proxy->setMethodPrefixInterceptor(
            '__get',
            static function ($proxy, $instance, string $method, array $params, bool & $returnEarly) use ($listener): void {
                $listener->__invoke($proxy, $instance, $method, $params, $returnEarly);
            }
        );

        $accessor = [$callerObject, $method];
        assert(is_callable($accessor));

        self::assertSame($expectedValue, $accessor($proxy));
    }

    public function getMethodsThatAccessPropertiesOnOtherObjectsInTheSameScope(): Generator
    {
        foreach ((new ReflectionClass(OtherObjectAccessClass::class))->getProperties() as $property) {
            $property->setAccessible(true);

            $propertyName  = $property->getName();
            $realInstance  = new OtherObjectAccessClass();
            $expectedValue = uniqid('', true);

            $property->setValue($realInstance, $expectedValue);

            // callee is an actual object
            yield OtherObjectAccessClass::class . '#$' . $propertyName => [
                new OtherObjectAccessClass(),
                $realInstance,
                'get' . ucfirst($propertyName),
                $expectedValue,
                $propertyName,
            ];

            $realInstance  = new OtherObjectAccessClass();
            $expectedValue = uniqid('', true);

            $property->setValue($realInstance, $expectedValue);

            // callee is a proxy (not to be lazy-loaded!)
            yield '(proxy) ' . OtherObjectAccessClass::class . '#$' . $propertyName => [
                (new AccessInterceptorValueHolderFactory())->createProxy(new OtherObjectAccessClass()),
                $realInstance,
                'get' . ucfirst($propertyName),
                $expectedValue,
                $propertyName,
            ];
        }
    }

    /**
     * @group 327
     */
    public function testWillInterceptAndReturnEarlyOnVoidMethod(): void
    {
        $skip      = random_int(100, 200);
        $addMore   = random_int(201, 300);
        $increment = random_int(301, 400);

        $object = (new AccessInterceptorValueHolderFactory())->createProxy(
            new VoidCounter(),
            [
                'increment' => static function (
                    AccessInterceptorInterface $proxy,
                    VoidCounter $instance,
                    string $method,
                    array $params,
                    ?bool & $returnEarly
                ) use ($skip): void {
                    if ($skip !== $params['amount']) {
                        return;
                    }

                    $returnEarly = true;
                },
            ],
            [
                'increment' => static function (
                    AccessInterceptorInterface $proxy,
                    VoidCounter $instance,
                    string $method,
                    array $params,
                    ?bool & $returnEarly
                ) use ($addMore): void {
                    if ($addMore !== $params['amount']) {
                        return;
                    }

                    /** @noinspection IncrementDecrementOperationEquivalentInspection */
                    $instance->counter += 1;
                },
            ]
        );

        $object->increment($skip);
        self::assertSame(0, $object->counter);

        $object->increment($increment);
        self::assertSame($increment, $object->counter);

        $object->increment($addMore);
        self::assertSame($increment + $addMore + 1, $object->counter);
    }

    public function testByReferencePassedArgumentsAreGivenAsReferenceToInterceptorCallbacks(): void
    {
        $proxy = (new AccessInterceptorValueHolderFactory())->createProxy(
            new ReferenceIncrementDecrementClass(),
            [
                'incrementReference' => static function (
                    $proxy,
                    ReferenceIncrementDecrementClass $instance,
                    string $method,
                    array $args,
                    bool &$returnEarly
                ): void {
                    self::assertSame(0, $args['reference']);

                    $returnEarly       = true;
                    $args['reference'] = 5;
                },
            ]
        );

        $number = 0;

        $proxy->incrementReference($number);

        self::assertSame(5, $number, 'Number was changed by interceptor');
    }

    public function testByReferenceArgumentsAreForwardedThroughInterceptorsAndSubject(): void
    {
        $proxy = (new AccessInterceptorValueHolderFactory())->createProxy(
            new ReferenceIncrementDecrementClass(),
            [
                'incrementReference' => static function (
                    $proxy,
                    ReferenceIncrementDecrementClass $instance,
                    string $method,
                    array $args,
                    bool &$returnEarly
                ): void {
                    self::assertSame(0, $args['reference']);

                    $returnEarly       = false;
                    $args['reference'] = 5;
                },
            ],
            [
                'incrementReference' => static function (
                    $proxy,
                    ReferenceIncrementDecrementClass $instance,
                    string $method,
                    array $args,
                    $returnValue,
                    bool &$returnEarly
                ): void {
                    self::assertIsInt($args['reference']);

                    $returnEarly        = false;
                    $args['reference'] *= 2;
                },
            ]
        );

        $number = 0;

        $proxy->incrementReference($number);

        self::assertSame(
            12,
            $number,
            'Number was changed by prefix interceptor, then incremented, then doubled by suffix interceptor'
        );
    }

    private static function assertByRefVariableValueSame($expected, & $actual): void
    {
        self::assertSame($expected, $actual);
    }
}