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<?php declare(strict_types = 1);
/*
 * Copyright (c) 2020, Josef Kufner  <josef@kufner.cz>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
namespace Smalldb\StateMachine\AccessControlExtension;
use Smalldb\StateMachine\AccessControlExtension\Definition\StateMachine\AccessControlExtension;
use Smalldb\StateMachine\AccessControlExtension\Definition\Transition\AccessPolicyExtension;
use Smalldb\StateMachine\AccessControlExtension\Predicate\ContainerAdapter;
use Smalldb\StateMachine\AccessControlExtension\Predicate\PredicateCompiled;
use Smalldb\StateMachine\AccessControlExtension\Predicate\SymfonyContainerAdapter;
use Smalldb\StateMachine\Definition\TransitionDefinition;
use Smalldb\StateMachine\InvalidArgumentException;
use Smalldb\StateMachine\ReferenceInterface;
use Smalldb\StateMachine\SmalldbDefinitionBagInterface;
use Smalldb\StateMachine\Transition\TransitionGuard;
use Symfony\Component\DependencyInjection\ContainerBuilder;
class SimpleTransitionGuard implements TransitionGuard
{
    /** @var \Closure[][][] */
    private array $transitionPredicates;
    /** @var PredicateCompiled[][][] */
    private array $transitionPredicateCache = [];
    private bool $defaultAllow;
    /**
     * @param \Closure[][][] $transitionPredicates
     */
    public function __construct(array $transitionPredicates = [], bool $defaultAllow = true)
    {
        $this->transitionPredicates = $transitionPredicates;
        $this->defaultAllow = $defaultAllow;
    }
    public static function compileTransitionPredicatesSymfony(SmalldbDefinitionBagInterface $definitionBag, ContainerBuilder $container)
    {
        $containerAdapter = new SymfonyContainerAdapter($container);
        return static::compileTransitionPredicates($definitionBag, $containerAdapter);
    }
    public static function compileTransitionPredicates(SmalldbDefinitionBagInterface $definitionBag, ContainerAdapter $containerAdapter)
    {
        $guardPredicates = [];
        foreach ($definitionBag->getAllDefinitions() as $definition) {
            if ($definition->hasExtension(AccessControlExtension::class)) {
                /** @var AccessControlExtension $ext */
                $ext = $definition->getExtension(AccessControlExtension::class);
                $predicates = $ext->compilePolicyPredicates($containerAdapter);
                $defaultPolicyName = $ext->getDefaultPolicyName();
                $machineType = $definition->getMachineType();
                foreach ($definition->getTransitions() as $tr) {
                    $transitionName = $tr->getName();
                    $sourceState = $tr->getSourceState()->getName();
                    if ($tr->hasExtension(AccessPolicyExtension::class)) {
                        /** @var AccessPolicyExtension $policyExt */
                        $policyExt = $tr->getExtension(AccessPolicyExtension::class);
                        $policyName = $policyExt->getPolicyName();
                    } else {
                        $policyName = $defaultPolicyName;
                    }
                    if (empty($predicates[$policyName])) {
                        throw new InvalidArgumentException("Access policy not found: $policyName");
                    }
                    $guardPredicates[$machineType][$sourceState][$transitionName]
                        = $containerAdapter->closureWrap($predicates[$policyName]);
                }
            }
        }
        return $guardPredicates;
    }
    public function isTransitionAllowed(ReferenceInterface $ref, TransitionDefinition $transition): bool
    {
        return $this->isAccessAllowed($ref->getMachineType(), $transition->getName(), $ref);
    }
    public function isAccessAllowed(string $machineType, string $transitionName, ReferenceInterface $ref): bool
    {
        if (!empty($this->transitionPredicates[$machineType])) {
            $sourceState = $ref->getState();
            // Check cached predicate
            if (isset($this->transitionPredicateCache[$machineType][$sourceState][$transitionName])) {
                return $this->transitionPredicateCache[$machineType][$sourceState][$transitionName]->evaluate($ref);
            }
            // Load predicate
            $predicate = $this->getTransitionPredicate($machineType, $sourceState, $transitionName);
            if ($predicate !== null) {
                $this->transitionPredicateCache[$machineType][$sourceState][$transitionName] = $predicate;
                return $predicate->evaluate($ref);
            }
            // No predicate
            return false;
        } else {
            return $this->defaultAllow;
        }
    }
    public function getTransitionPredicates(): array
    {
        return $this->transitionPredicates;
    }
    private function getTransitionPredicate(string $machineType, string $sourceState, string $transitionName): ?PredicateCompiled
    {
        $p = $this->transitionPredicates[$machineType][$sourceState][$transitionName] ?? null;
        if ($p instanceof PredicateCompiled) {
            return $p;
        } else if (is_callable($p)) {
            return $p();
        } else {
            return null;
        }
    }
}