<?php

use Drupal\wing\Plugin\Core\Entity\State;

/**
 * @file
 * Workflow - New Generation
 *
 * - States are entities
 * - Transitions are fields on states, storing a (rid, sid) pair per item
 * - Any entity type can be subject to a workflow: association is represented by
 *   an entity_reference field whose widget uses a specific view to list the
 *   relevant states
 * - Workflow access is handled by field access using the permission associated
 *   with a state, one "view" or "edit" permission per state entity
 *
 * URL structure admin/structure/wing/...
 * /: dashboard
 * /settings: module settings
 * /add: workflow creation form
 * /workflow[/list]: list of workflows
 * /workflow/add: state creation form
 * /workflow/<wname>[/info]: info on workflow with list of states
 * /workflow/<wname>/edit|clone|delete|export: workflow operations form
 * /workflow/<wname>/fields: field UI for workflow as state bundle
 * /workflow/<wname>/fields: view modes for workflow as state bundle
 * /state[/list]: list of states
 * /state/<sname>[/info]: info on state, with list of previous/next states
 *   and list of entities in state
 * /state/<sname>/edit|clone|delete|export
 *   state operations form. Main point of interest is the transitions subform
 */

/**
 * Implements hook_entity_bundle_info().
 */
function wing_entity_bundle_info() {
  $bundles = array();
  foreach (wing_get_workflows() as $workflow => $title) {
    $bundles['wing_state'][$type] = array(
      'label' => $title,
      'admin' => array(
        // Place the Field UI paths for comments one level below the
        // corresponding paths for nodes, so that they appear in the same set
        // of local tasks. Note that the paths use a different placeholder name
        // and thus a different menu loader callback, so that Field UI page
        // callbacks get a comment bundle name from the node type in the URL.
        // See comment_node_type_load() and comment_menu_alter().
        'path' => 'admin/content/wing/manage/%wing_workflow',
        'bundle argument' => 4,
        'real path' => 'admin/content/wing/manage/' . $workflow. '/comment',
      ),
    );
  }
  return $bundles;
}

/**
 * Implements hook_entity_view_mode().
 */
function wing_entity_view_mode_info() {
  $ret = array(
    'wing_state' => array(
      'full' => array(
        'label' => t('Full'),
        'custom settings' => FALSE,
      ),
      'summary' => array(
        'label' => t('Summary'),
        'custom settings' => FALSE,
      ),
      'simple' => array(
        'label' => t('Simple'),
        'custom settings' => FALSE,
      ),
    ),
  );
dsm($ret, __FUNCTION__);
  return $ret;
}

/**
 * Implements hook_field_extra_fields().
 */
function wing_field_extra_fields() {
  $ret = array();
  foreach (wing_get_workflows() as $workflow => $title) {
    $ret['wing_state'][$workflow]['workflow'] = array(
      'display' => array(
        'label' => t('Workflow name'),
        'description' => t('The workflow to which the state belongs'),
        'weight' => -9,
        'visible' => FALSE,
      ),
    );
  }
  dsm($ret, __FUNCTION__);
  return $ret;
}

/**
 * Helper to retrive the list or workflows or a specific workflow.
 *
 * @param string $workflow
 */
function wing_get_workflows($workflow = NULL) {
  $workflows = config('wing')->get('workflows');
  if (isset($workflow)) {
    $ret = isset($workflows[$workflow]) ? $workflows[$workflow] : FALSE;
  }
  else {
    $ret = (array) $workflows;
  }

  dsm($ret, __FUNCTION__ . "($workflow)");
  return $ret;
}

/**
 * Implements hook_help().
 */
function wing_help($path, $arg) {
  switch ($path) {
    case 'admin/help#wing':
      $ret = '<h3>' . t('About') . '</h3>'
        . t('Wing is a new workflow system redesigned from the ground up for Drupal 8.
States are entities, Workflows are their bundles, and any fieldable entity type
(not just nodes) can be subjected to a workflow by adding an entity_reference to
a Wing state field to its field list.');
      break;

    default:
      $ret = NULL;
  }

  return $ret;
}

/**
 * Implements hook_menu().
 */
function wing_menu() {
  $items = array();
  $items['admin/content/wing'] = array(
    'access arguments' => array('administer wing'),
    'description' => 'Report general Wing information',
    'file' => 'wing.admin.inc',
    'page callback' => 'wing_page_info',
    'title' => 'Wing',
    'type' => MENU_LOCAL_TASK | MENU_NORMAL_ITEM,
    'weight' => 23, // 'W'
  );

  // Tabs begin here.
  $items['admin/content/wing/info'] = array(
    'title' => 'Info',
    'type' => MENU_DEFAULT_LOCAL_TASK,
  );
  $items['admin/content/wing/overview'] = array(
    'title' => 'States',
    'access arguments' => array('administer wing'),
    'description' => 'List and edit workflow states',
    'file' => 'wing.pages.inc',
    'page callback' => 'wing_overview',
    'title' => 'Wing',
    'type' => MENU_LOCAL_TASK,
  );
  $items['admin/content/wing/%wing_state'] = array(
    'access arguments' => array('administer wing'),
    'page arguments' => array(3),
    'page callback' => 'wing_state_page',
    'title' => 'State permalink',
  );
  $items['admin/content/wing/%wing_state/view'] = array(
    'title' => 'View state',
    'type' => MENU_DEFAULT_LOCAL_TASK,
  );
  $items['admin/content/wing/%wing_state/edit'] = array(
    'title' => 'Edit',
    'page callback' => 'wing_state_edit_page',
    'page arguments' => array(3),
    'access callback' => 'wing_state_access',
    'access arguments' => array('edit', 3),
    'type' => MENU_LOCAL_TASK,
  );
  $items['admin/content/wing/%wing_state/delete'] = array(
    'title' => 'Delete',
    'page callback' => 'wing_state_confirm_delete_page',
    'page arguments' => array(3),
    'access arguments' => array('administer wing'),
    'type' => MENU_LOCAL_TASK,
    'file' => 'wing.admin.inc',
    'weight' => 20,
  );

  $items['admin/content/wing/settings'] = array(
    'title' => 'Settings',
    'type' => MENU_LOCAL_TASK,
    'page callback' => 'drupal_get_form',
    'page arguments' => array('wing_settings_form'),
    'file' => 'wing.admin.inc',
    'access arguments' => array('administer wing'),
    'weight' => 99,
  );

  return $items;
}

/**
 * TODO implement
 *
 * @param string $op
 * @param Drupal\wing\Plugin\Core\Entity\State $state
 *
 * @return boolean
 */
function wing_state_access($op, State $state) {

}

/**
 * Entity URI callback.
 */
function wing_uri(State $state) {
  return array(
    'path' => 'admin/content/wing/' . $state->id(),
  );
}


/**
 * Menu loader for workflow.
 *
 * @param string $workflow
 *
 * @return boolean
 */
function wing_workflow_load($workflow) {
  $ret = wing_get_workflows($workflow);
  dsm($ret, __FUNCTION__);
  return $ret;
}

function WIPWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWww() {}

/**
 * Implements hook_entity_info().
 *
 * Workflow is the bundle entity for state, but this concept is obsolete in D8,
 * so we ignore it.
 */
function Zwing_entity_info() {
  $defaults = array(
    'entity keys' => array(
      'label' => 'title',
      'module' => 'module',
      'name' => 'machine_name',
      'status' => 'status',
    ),
    'exportable' => TRUE,
    'fieldable' => FALSE,
    'label callback' => 'entity_class_label',
    'module' => 'wing',
    'uri callback' => 'entity_class_uri',
  );

  $ret = array();

  $type = 'wing_workflow';
  $class = 'WingWorkflow';
  $ret[$type] = array_merge_recursive(array(
    'access callback' => "{$type}_access",
    'base table' => $type,
    'controller class' => "{$class}Controller",
    'entity class' => $class,
    'entity keys' => array(
      'id' => 'wid',
    ),
    'export' => array(
      'default hook' => "default_{$type}s",
    ),
    'features controller class' => "{$class}FeaturesController",
    'label' => t('Wing: Workflow'),
    'load hook' => "{$type}_load", // Enable hook_wing_workflow_load().
    'views controller class' => "{$class}ViewsController",
  ), $defaults);

  $type = 'wing_state';
  $class = 'WingState';
  $ret[$type] = array_merge_recursive(array(
    'access callback' => '{$type}_access',
    'base table' => $type,
    'bundle keys' => array('bundle' => 'workflow'),
    'bundles' => array(),
    'controller class' => "{$class}Controller",
    'entity class' => $class,
    'entity keys' => array(
      'id' => 'sid',
      'bundle' => 'workflow',
    ),
    'export' => array(
      'default_hook' => "default_{$type}s",
    ),
    'features controller class' => "{$class}FeaturesController",
    'label' => t('Wing: State'),
    'load hook' => "{$type}_load", // Enable hook_wing_state_load().
    'views controller class' => "{$class}ViewsController",
  ), $defaults);

  return $ret;
}

/**
 * Implements hook_entity_info_alter().
 *
 * Sort initial Wing entity info keys for easier debugging.
 */
function Zwing_entity_info_alter(&$info) {
  ksort($info['wing_state']);
  ksort($info['wing_workflow']);
}

/**
 * Implements hook_field_info().
 *
 * Define "wing_transition" as a UI-less field.
 */
function Zwing_field_info() {
  $ret = array(
    'wing_transition' => array(
      'label' => t('Wing: Transition'),
      'description' => t('Store access from one workflow state to another.'),
      'settings' => array(),
      'instance_settings' => array(),
      'default_widget' => 'text_textfield',
      'default_formatter' => 'text_default',
//       'default_widget' => 'wing_transition_widget',
//       'default_formatter' => 'wing_transition_default',
//      'no_ui' => FALSE,
    ),
  );
dsm($ret, __FUNCTION__);
  return $ret;
}

/**
 * Implements hook_field_widget_info().
 */
function Zwing_field_widget_info() {
  $ret = array(
    'text_textfield' => array(
      'label' => t('Text field'),
      'field types' => array('text'),
      'settings' => array('size' => 60),
      'behaviors' => array(
        'multiple values' => FIELD_BEHAVIOR_DEFAULT,
        'default value' => FIELD_BEHAVIOR_DEFAULT,
      ),
    ),
  );

  return $ret;
}

/**
 * Implements hook_field_widget_info_alter().
 */
function Zwing_field_widget_info_alter(&$info) {
  if (module_exists('text')) {
    $info['text_textfield']['field types'][] = 'wing_transition';
  }
}

/**
 * Implements hook_permission().
 */
function Zwing_permission() {
  $ret = array(
    'administer wing' =>  array(
      'title' => t('Administer Wing'),
      'description' => t('Perform administration tasks for Wing.'),
    ),
  );

  return $ret;
}

/**
 * Entity access callback for wing_state.
 *
 * @param string $op
 *   'create', 'update', 'delete' or 'view'
 * @param WingState $entity
 * @param stdClass $account
 * @param string $entity_type
 *
 * @return boolean
 */
function Zwing_state_access($op, $entity, $account, $entity_type) {
  // dsm(get_defined_vars(), __FUNCTION__);
  return TRUE;
}

/**
 * Implements hook_view_api().
 */
function Zwing_views_api() {
  $path = drupal_get_path('module', 'wing');
  $ret = array(
    'api' => 3,
    'path' =>  "$path/views",
    'template path' => "$path/themes",
  );
  return $ret;
}

/**
 * Entity access callback for wing_workflow.
 *
 * @param string $op
 *   'create', 'update', 'delete' or 'view'
 * @param WingWorkflow $entity
 * @param stdClass $account
 * @param string $entity_type
 *
 * @return boolean
 */
function Zwing_workflow_access($op, $entity, $account, $entity_type) {
  $s_entity = isset($entity) ? "$entity" : 'NULL';
  $s_account = isset($account) ? $account->uid : "'<anonymous>'";

  // dsm(__FUNCTION__ . "('$op', $s_entity, $s_account, '$entity_type')");
  return TRUE;
}

function Zwing_workflow_exists($machine_name) {
  $ret = entity_load_multiple_by_name('wing_workflow', array($machine_name));
  dsm($ret, __FUNCTION__);
  return $ret;
}