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<?php |
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declare(strict_types=1); |
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namespace FondBot\Conversation; |
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use Closure; |
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use FondBot\Channels\Chat; |
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use FondBot\Channels\User; |
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use FondBot\Channels\Channel; |
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use Illuminate\Cache\Repository; |
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use FondBot\Events\MessageReceived; |
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use FondBot\Contracts\Conversation\Manager; |
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use FondBot\Contracts\Conversation\Activator; |
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use FondBot\Contracts\Conversation\Conversable; |
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use Illuminate\Contracts\Foundation\Application; |
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class ConversationManager implements Manager |
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{ |
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private $intents = []; |
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private $fallbackIntent; |
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private $application; |
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private $cache; |
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private $transitioned = false; |
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private $messageReceived; |
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public function __construct(Application $application, Repository $cache) |
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{ |
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$this->application = $application; |
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$this->cache = $cache; |
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} |
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/** {@inheritdoc} */ |
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public function registerIntent(string $class): void |
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{ |
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$this->intents[] = $class; |
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} |
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/** {@inheritdoc} */ |
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public function registerFallbackIntent(string $class): void |
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{ |
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$this->fallbackIntent = $class; |
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} |
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/** {@inheritdoc} */ |
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public function getIntents(): array |
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{ |
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return $this->intents; |
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} |
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/** {@inheritdoc} */ |
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public function matchIntent(MessageReceived $messageReceived): ?Intent |
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{ |
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foreach ($this->intents as $intent) { |
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/** @var Intent $intent */ |
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$intent = resolve($intent); |
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foreach ($intent->activators() as $activator) { |
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if (!$intent->passesAuthorization($messageReceived)) { |
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continue; |
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} |
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if ($activator instanceof Closure && value($activator($messageReceived)) === true) { |
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return $intent; |
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} |
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if ($activator instanceof Activator && $activator->matches($messageReceived)) { |
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return $intent; |
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} |
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} |
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} |
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// Otherwise, return fallback intent |
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return resolve($this->fallbackIntent); |
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} |
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/** {@inheritdoc} */ |
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public function resolveContext(Channel $channel, Chat $chat, User $user): Context |
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{ |
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$value = $this->cache->get($this->getCacheKeyForContext($channel, $chat, $user), [ |
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'chat' => $chat, |
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'user' => $user, |
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'intent' => null, |
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'interaction' => null, |
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'items' => [], |
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]); |
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$context = new Context($channel, $chat, $user, $value['items'] ?? []); |
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if (isset($value['intent'])) { |
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$context->setIntent(resolve($value['intent'])); |
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} |
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if (isset($value['interaction'])) { |
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$context->setInteraction(resolve($value['interaction'])); |
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} |
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// Bind resolved instance to the container |
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$this->application->instance('fondbot.conversation.context', $context); |
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return $context; |
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} |
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/** {@inheritdoc} */ |
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public function saveContext(Context $context): void |
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{ |
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$this->cache->forever( |
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$this->getCacheKeyForContext($context->getChannel(), $context->getChat(), $context->getUser()), |
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$context->toArray() |
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); |
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} |
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/** {@inheritdoc} */ |
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public function flushContext(Context $context): void |
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{ |
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$this->cache->forget( |
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$this->getCacheKeyForContext($context->getChannel(), $context->getChat(), $context->getUser()) |
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); |
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} |
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/** {@inheritdoc} */ |
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public function getContext(): ?Context |
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{ |
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if (!$this->application->has('fondbot.conversation.context')) { |
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return null; |
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} |
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return $this->application->get('fondbot.conversation.context'); |
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} |
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/** {@inheritdoc} */ |
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public function setReceivedMessage(MessageReceived $messageReceived): void |
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{ |
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$this->messageReceived = $messageReceived; |
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} |
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/** {@inheritdoc} */ |
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public function markAsTransitioned(): void |
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{ |
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$this->transitioned = true; |
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} |
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/** {@inheritdoc} */ |
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public function transitioned(): bool |
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{ |
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return $this->transitioned; |
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} |
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/** {@inheritdoc} */ |
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public function converse(Conversable $conversable): void |
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{ |
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context()->incrementAttempts(); |
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if ($conversable instanceof Intent) { |
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context()->setIntent($conversable)->setInteraction(null); |
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} |
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$conversable->handle($this->messageReceived); |
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} |
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/** {@inheritdoc} */ |
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public function restartInteraction(Interaction $interaction): void |
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{ |
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context()->setInteraction(null); |
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$this->converse($interaction); |
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$this->markAsTransitioned(); |
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} |
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public function __destruct() |
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{ |
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$context = $this->getContext(); |
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if ($context === null) { |
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return; |
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} |
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// Close session if conversation has not been transitioned |
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if (!$this->transitioned()) { |
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$this->flushContext($context); |
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} |
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// Save context if exists |
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if ($this->transitioned() && $context = context()) { |
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$this->saveContext($context); |
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} |
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} |
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private function getCacheKeyForContext(Channel $channel, Chat $chat, User $user): string |
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{ |
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return implode('.', ['context', $channel->getName(), $chat->getId(), $user->getId()]); |
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} |
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} |
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framework
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