<?php

namespace Drupal\commerce_shipping\Plugin\Commerce\Condition;

use Drupal\commerce\Plugin\Commerce\Condition\ConditionBase;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\physical\Weight;
use Drupal\physical\MeasurementType;

/**
 * Provides the weight range condition for shipments.
 *
 * @CommerceCondition(
 *   id = "shipment_weight_range",
 *   label = @Translation("Weight"),
 *   display_label = @Translation("Limit by shipment weight range"),
 *   category = @Translation("Shipment"),
 *   entity_type = "commerce_shipment",
 * )
 */
class ShipmentWeightRange extends ConditionBase {

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      'weight_min' => NULL,
      'weight_max' => NULL,
    ] + parent::defaultConfiguration();
  }

  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
    $form = parent::buildConfigurationForm($form, $form_state);

    $weight_min = $this->configuration['weight_min'];
    $weight_max = $this->configuration['weight_max'];

    $form['weight_min'] = [
      '#type' => 'physical_measurement',
      '#measurement_type' => MeasurementType::WEIGHT,
      '#title' => $this->t('Minimum Weight'),
      '#default_value' => $weight_min,
      '#required' => TRUE,
    ];
    $form['weight_max'] = [
      '#type' => 'physical_measurement',
      '#measurement_type' => MeasurementType::WEIGHT,
      '#title' => $this->t('Maximum Weight'),
      '#default_value' => $weight_max,
      '#required' => TRUE,
    ];    

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
    parent::submitConfigurationForm($form, $form_state);
    $values = $form_state->getValue($form['#parents']);
    $this->configuration['weight_min'] = $values['weight_min'];
    $this->configuration['weight_max'] = $values['weight_max'];
  }

  /**
   * {@inheritdoc}
   */
  public function evaluate(EntityInterface $entity) {
	$shipment = $entity;
	$this->assertEntity($entity);
    /** @var \Drupal\commerce_shipping\Entity\ShipmentInterface $shipment */
    $shipment = $entity;
    $weight = $shipment->getWeight();    
    if (!$weight) {
      // The conditions can't be applied until the weight is known.
      return FALSE;
    }
    $condition_unit_min = $this->configuration['weight_min']['unit'];
    $condition_unit_max = $this->configuration['weight_max']['unit'];
    /** @var \Drupal\physical\Weight $weight */
    $weight_min = $weight->convert($condition_unit_min);
    $weight_max = $weight->convert($condition_unit_max);
    $condition_weight_min = new Weight($this->configuration['weight_min']['number'], $condition_unit_min);
    $condition_weight_max = new Weight($this->configuration['weight_max']['number'], $condition_unit_max);
    
    if ($weight_min->greaterThanOrEqual($condition_weight_min) && $weight_max->lessThanOrEqual($condition_weight_max)) {
		return TRUE;
	} else {
		return FALSE;
	}
    
  }

}