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<?php |
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namespace Tgallice\Wit; |
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use Tgallice\Wit\Exception\BadResponseException; |
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use Tgallice\Wit\Exception\ConversationException; |
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use Tgallice\Wit\Exception\InvalidStepException; |
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use Tgallice\Wit\Exception\MaxIterationException; |
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use Tgallice\Wit\Model\Context; |
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use Tgallice\Wit\Model\Step; |
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use Tgallice\Wit\Model\Step\Action; |
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use Tgallice\Wit\Model\Step\Merge; |
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use Tgallice\Wit\Model\Step\Message; |
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use Tgallice\Wit\Model\Step\Stop; |
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class Conversation |
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{ |
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const MAX_STEPS_ITERATION = 5; |
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/** |
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* @var API |
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*/ |
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private $api; |
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/** |
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* @var ActionMapping |
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*/ |
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private $actionMapping; |
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public function __construct(Api $api, ActionMapping $actionMapping) |
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{ |
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$this->api = $api; |
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$this->actionMapping = $actionMapping; |
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} |
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/** |
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* @param string $sessionId |
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* @param string|null $message |
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* @param Context|null $context |
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* @param int $stepIteration |
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* |
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* @return Context The new Context |
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*/ |
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public function converse($sessionId, $message = null, Context $context = null, $stepIteration = self::MAX_STEPS_ITERATION) |
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{ |
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$context = (null !== $context) ? $context : new Context(); |
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if ($stepIteration <= 0) { |
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$error = new MaxIterationException("Max iteration exceeded"); |
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$this->actionMapping->error($sessionId, $context, $error); |
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return $context; |
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} |
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try { |
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$step = $this->getNextStep($sessionId, $message, $context); |
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} catch (\Exception $e) { |
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// Trigger the error action |
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$stepData = $e instanceof ConversationException ? $e->getStepData() : []; |
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$this->actionMapping->error($sessionId, $context, $e, $stepData); |
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return new Context(); |
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} |
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return $this->performStep($sessionId, $step, $context, $stepIteration); |
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} |
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/** |
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* @param string $sessionId |
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* @param string|null $message |
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* @param Context $context |
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* |
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* @return Step Step object |
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* |
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* @throws BadResponseException |
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*/ |
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private function getNextStep($sessionId, $message, Context $context) |
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{ |
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$response = $this->api->getConverseNextStep($sessionId, $message, $context); |
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if (200 !== $response->getStatusCode()) { |
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$message = empty($response->getReasonPhrase()) ? 'Bad response status code' : $response->getReasonPhrase(); |
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throw new BadResponseException($message, $response); |
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} |
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$step = json_decode((string) $response->getBody(), true); |
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if (null === $step) { |
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$step = []; |
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} |
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if (isset($step['error'])) { |
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throw new ConversationException($step['error'], $sessionId, $context, $step); |
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} |
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try { |
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$step = StepFactory::create($step); |
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} catch (InvalidStepException $e) { |
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throw new ConversationException($e->getMessage(), $sessionId, $context, $e->getStepData()); |
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} |
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return $step; |
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} |
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/** |
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* @param $sessionId |
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* @param Step $step |
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* @param Context $context |
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* @param int $currentIteration |
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* |
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* @return Context |
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*/ |
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private function performStep($sessionId, Step $step, Context $context, $currentIteration) |
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{ |
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switch (true) { |
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case $step instanceof Merge: |
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$newContext = $this->actionMapping->merge($sessionId, $context, $step->getEntities()); |
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$context = $this->converse($sessionId, null, $newContext, --$currentIteration); |
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break; |
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case $step instanceof Message: |
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$this->actionMapping->say($sessionId, $step->getMessage(), $context); |
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break; |
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case $step instanceof Action: |
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$newContext = $this->actionMapping->action($sessionId, $step->getAction(), $context); |
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$context = $this->converse($sessionId, null, $newContext, --$currentIteration); |
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break; |
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case $step instanceof Stop: |
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$this->actionMapping->stop($sessionId, $context); |
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break; |
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} |
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return $context; |
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} |
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} |
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tgallice /
wit-php
