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<?php

namespace Drupal\workflows\Form;

use Drupal\Core\Form\SubformState;
use Drupal\Core\Plugin\PluginFormFactoryInterface;
use Drupal\workflows\Entity\Workflow;
use Drupal\workflows\State;
use Drupal\Core\Entity\EntityForm;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
use Drupal\workflows\WorkflowTypeInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * The form for editing workflows.
 *
 * @internal
 */
class WorkflowEditForm extends EntityForm {

  /**
   * The plugin form factory.
   *
   * @var \Drupal\Core\Plugin\PluginFormFactoryInterface
   */
  protected $pluginFormFactory;

  /**
   * Creates an instance of WorkflowStateEditForm.
   *
   * @param \Drupal\Core\Plugin\PluginFormFactoryInterface $pluginFormFactory
   *   The plugin form factory.
   */
  public function __construct(PluginFormFactoryInterface $pluginFormFactory) {
    $this->pluginFormFactory = $pluginFormFactory;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('plugin_form.factory')
    );
  }

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

    /* @var \Drupal\workflows\WorkflowInterface $workflow */
    $workflow = $this->entity;
    $workflow_type = $workflow->getTypePlugin();
    $form['#title'] = $this->t('Edit %label workflow', ['%label' => $workflow->label()]);

    $form['label'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Label'),
      '#maxlength' => 255,
      '#default_value' => $workflow->label(),
      '#required' => TRUE,
    ];

    $form['id'] = [
      '#type' => 'machine_name',
      '#default_value' => $workflow->id(),
      '#machine_name' => [
        'exists' => [Workflow::class, 'load'],
      ],
      '#disabled' => TRUE,
    ];

    $header = [
      'state' => $this->t('State'),
      'weight' => $this->t('Weight'),
      'operations' => $this->t('Operations'),
    ];
    $form['states_container'] = [
      '#type' => 'details',
      '#title' => $this->t('States'),
      '#open' => TRUE,
    ];
    $form['states_container']['states'] = [
      '#type' => 'table',
      '#header' => $header,
      '#title' => $this->t('States'),
      '#empty' => $this->t('There are no states yet.'),
      '#tabledrag' => [
        [
          'action' => 'order',
          'relationship' => 'sibling',
          'group' => 'state-weight',
        ],
      ],
    ];

    $states = $workflow->getTypePlugin()->getStates();

    // Warn the user if there are no states.
    if (empty($states)) {
      $this->messenger()->addWarning(
        $this->t(
          'This workflow has no states and will be disabled until there is at least one, <a href=":add-state">add a new state.</a>',
          [':add-state' => $workflow->toUrl('add-state-form')->toString()]
        )
      );
    }

    $state_weight_delta = round(count($states) / 2);
    foreach ($states as $state) {
      $links = [
        'edit' => [
          'title' => $this->t('Edit'),
          'url' => Url::fromRoute('entity.workflow.edit_state_form', ['workflow' => $workflow->id(), 'workflow_state' => $state->id()]),
        ],
      ];
      if ($this->entity->access('delete-state:' . $state->id())) {
        $links['delete'] = [
          'title' => $this->t('Delete'),
          'url' => Url::fromRoute('entity.workflow.delete_state_form', [
            'workflow' => $workflow->id(),
            'workflow_state' => $state->id(),
          ]),
        ];
      }
      $form['states_container']['states'][$state->id()] = [
        '#attributes' => ['class' => ['draggable']],
        'state' => ['#markup' => $state->label()],
        '#weight' => $state->weight(),
        'weight' => [
          '#type' => 'weight',
          '#title' => $this->t('Weight for @title', ['@title' => $state->label()]),
          '#title_display' => 'invisible',
          '#default_value' => $state->weight(),
          '#attributes' => ['class' => ['state-weight']],
          '#delta' => $state_weight_delta,
        ],
        'operations' => [
          '#type' => 'operations',
          '#links' => $links,
        ],
      ];
    }
    $form['states_container']['state_add'] = [
      '#markup' => $workflow->toLink($this->t('Add a new state'), 'add-state-form')->toString(),
    ];

    $header = [
      'label' => $this->t('Label'),
      'weight' => $this->t('Weight'),
      'from' => $this->t('From'),
      'to' => $this->t('To'),
      'operations' => $this->t('Operations'),
    ];
    $form['transitions_container'] = [
      '#type' => 'details',
      '#title' => $this->t('Transitions'),
      '#open' => TRUE,
    ];
    $form['transitions_container']['transitions'] = [
      '#type' => 'table',
      '#header' => $header,
      '#title' => $this->t('Transitions'),
      '#empty' => $this->t('There are no transitions yet.'),
      '#tabledrag' => [
        [
          'action' => 'order',
          'relationship' => 'sibling',
          'group' => 'transition-weight',
        ],
      ],
    ];

    $transitions = $workflow->getTypePlugin()->getTransitions();
    $transition_weight_delta = round(count($transitions) / 2);
    foreach ($transitions as $transition) {
      $links['edit'] = [
        'title' => $this->t('Edit'),
        'url' => Url::fromRoute('entity.workflow.edit_transition_form', ['workflow' => $workflow->id(), 'workflow_transition' => $transition->id()]),
      ];
      $links['delete'] = [
        'title' => $this->t('Delete'),
        'url' => Url::fromRoute('entity.workflow.delete_transition_form', ['workflow' => $workflow->id(), 'workflow_transition' => $transition->id()]),
      ];
      $form['transitions_container']['transitions'][$transition->id()] = [
        '#attributes' => ['class' => ['draggable']],
        'label' => ['#markup' => $transition->label()],
        '#weight' => $transition->weight(),
        'weight' => [
          '#type' => 'weight',
          '#title' => $this->t('Weight for @title', ['@title' => $transition->label()]),
          '#title_display' => 'invisible',
          '#default_value' => $transition->weight(),
          '#attributes' => ['class' => ['transition-weight']],
          '#delta' => $transition_weight_delta,
        ],
        'from' => [
          '#theme' => 'item_list',
          '#items' => array_map([State::class, 'labelCallback'], $transition->from()),
          '#context' => ['list_style' => 'comma-list'],
        ],
        'to' => ['#markup' => $transition->to()->label()],
        'operations' => [
          '#type' => 'operations',
          '#links' => $links,
        ],
      ];
    }
    $form['transitions_container']['transition_add'] = [
      '#markup' => $workflow->toLink($this->t('Add a new transition'), 'add-transition-form')->toString(),
    ];

    if ($workflow_type->hasFormClass(WorkflowTypeInterface::PLUGIN_FORM_KEY)) {
      $form['type_settings'] = [
        '#tree' => TRUE,
      ];
      $subform_state = SubformState::createForSubform($form['type_settings'], $form, $form_state);
      $form['type_settings'] += $this->pluginFormFactory
        ->createInstance($workflow_type, WorkflowTypeInterface::PLUGIN_FORM_KEY)
        ->buildConfigurationForm($form['type_settings'], $subform_state);
    }

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state) {
    /* @var \Drupal\workflows\WorkflowInterface $workflow */
    $workflow = $this->entity;
    $workflow_type = $workflow->getTypePlugin();

    if ($workflow_type->hasFormClass(WorkflowTypeInterface::PLUGIN_FORM_KEY)) {
      $subform_state = SubformState::createForSubform($form['type_settings'], $form, $form_state);
      $this->pluginFormFactory
        ->createInstance($workflow_type, WorkflowTypeInterface::PLUGIN_FORM_KEY)
        ->validateConfigurationForm($form['type_settings'], $subform_state);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function save(array $form, FormStateInterface $form_state) {
    /* @var \Drupal\workflows\WorkflowInterface $workflow */
    $workflow = $this->entity;
    $workflow_type = $workflow->getTypePlugin();

    if ($workflow_type->hasFormClass(WorkflowTypeInterface::PLUGIN_FORM_KEY)) {
      $subform_state = SubformState::createForSubform($form['type_settings'], $form, $form_state);
      $this->pluginFormFactory
        ->createInstance($workflow_type, WorkflowTypeInterface::PLUGIN_FORM_KEY)
        ->submitConfigurationForm($form['type_settings'], $subform_state);
    }

    $workflow->save();
    $this->messenger()->addStatus($this->t('Saved the %label Workflow.', ['%label' => $workflow->label()]));
  }

  /**
   * {@inheritdoc}
   */
  protected function copyFormValuesToEntity(EntityInterface $entity, array $form, FormStateInterface $form_state) {
    // This form can only set the workflow's ID, label and the weights for each
    // state.
    /** @var \Drupal\workflows\WorkflowInterface $entity */
    $values = $form_state->getValues();
    $entity->set('label', $values['label']);
    $entity->set('id', $values['id']);
    foreach ($values['states'] as $state_id => $state_values) {
      $entity->getTypePlugin()->setStateWeight($state_id, $state_values['weight']);
    }
    foreach ($values['transitions'] as $transition_id => $transition_values) {
      $entity->getTypePlugin()->setTransitionWeight($transition_id, $transition_values['weight']);
    }
  }

}