<?php

/**
 * @file
 * Definition of Drupal\breakpoint\Plugin\Core\Entity\BreakpointGroup.
 */

namespace Drupal\breakpoint\Plugin\Core\Entity;

use Drupal\Core\Config\Entity\ConfigEntityBase;
use Drupal\breakpoint\InvalidBreakpointSourceException;
use Drupal\breakpoint\InvalidBreakpointSourceTypeException;
use Drupal\Core\Entity\Annotation\EntityType;
use Drupal\Core\Annotation\Translation;

/**
 * Defines the BreakpointGroup entity.
 *
 * @EntityType(
 *   id = "breakpoint_group",
 *   label = @Translation("Breakpoint group"),
 *   module = "breakpoint",
 *   controllers = {
 *     "storage" = "Drupal\Core\Config\Entity\ConfigStorageController"
 *   },
 *   config_prefix = "breakpoint.breakpoint_group",
 *   entity_keys = {
 *     "id" = "id",
 *     "label" = "label",
 *     "uuid" = "uuid"
 *   }
 * )
 */
class BreakpointGroup extends ConfigEntityBase {

  /**
   * The breakpoint group ID.
   *
   * @var string
   */
  public $id;

  /**
   * The breakpoint group UUID.
   *
   * @var string
   */
  public $uuid;

  /**
   * The breakpoint group machine name.
   *
   * @var string
   */
  public $name;

  /**
   * The breakpoint group label.
   *
   * @var string
   */
  public $label;

  /**
   * The breakpoint group breakpoints.
   *
   * @var array
   *   Array containing all breakpoints of this group.
   *
   * @see Drupal\breakpoint\Plugin\Core\Entity\Breakpoint
   */
  public $breakpoints = array();

  /**
   * The breakpoint group source: theme or module name. Use 'user' for
   * user-created groups.
   *
   * @var string
   */
  public $source = 'user';

  /**
   * The breakpoint group source type.
   *
   * @var string
   *   Allowed values:
   *     Breakpoint::SOURCE_TYPE_THEME
   *     Breakpoint::SOURCE_TYPE_MODULE
   *     Breakpoint::SOURCE_TYPE_USER_DEFINED
   *
   * @see Drupal\breakpoint\Plugin\Core\Entity\Breakpoint
   */
  public $sourceType = Breakpoint::SOURCE_TYPE_USER_DEFINED;

  /**
   * Overrides Drupal\config\ConfigEntityBase::__construct().
   */
  public function __construct(array $values, $entity_type) {
    parent::__construct($values, $entity_type);
    $this->loadAllBreakpoints();
  }

  /**
   * Overrides Drupal\Core\Entity\Entity::save().
   */
  public function save() {
    // Check if everything is valid.
    if (!$this->isValid()) {
      throw new InvalidBreakpointException('Invalid data detected.');
    }
    if (empty($this->id)) {
      $this->id = $this->sourceType . '.' . $this->source . '.' . $this->name;
    }
    // Only save the keys, but return the full objects.
    $this->breakpoints = array_keys($this->breakpoints);
    parent::save();
    $this->loadAllBreakpoints();
  }

  /**
   * Checks if the breakpoint group is valid.
   *
   * @throws Drupal\breakpoint\InvalidBreakpointSourceTypeException
   * @throws Drupal\breakpoint\InvalidBreakpointSourceException
   *
   * @return true
   *   Returns true if the breakpoint group is valid.
   */
  public function isValid() {
    // Check for illegal values in breakpoint group source type.
    if (!in_array($this->sourceType, array(
        Breakpoint::SOURCE_TYPE_USER_DEFINED,
        Breakpoint::SOURCE_TYPE_MODULE,
        Breakpoint::SOURCE_TYPE_THEME)
      )) {
      throw new InvalidBreakpointSourceTypeException(format_string('Invalid source type @source_type', array(
        '@source_type' => $this->sourceType,
      )));
    }
    // Check for illegal characters in breakpoint group source.
    if (preg_match('/[^a-z_]+/', $this->source) || empty($this->source)) {
      throw new InvalidBreakpointSourceException(format_string("Invalid value '@source' for breakpoint group source property. Breakpoint group source property can only contain lowercase letters and underscores.", array('@source' => $this->source)));
    }
    // Check for illegal characters in breakpoint group name.
    if (preg_match('/[^a-z0-9_]+/', $this->name || empty($this->name))) {
      throw new InvalidBreakpointNameException(format_string("Invalid value '@name' for breakpoint group name property. Breakpoint group name property can only contain lowercase letters, numbers and underscores.", array('@name' => $this->name)));
    }
    return TRUE;
  }

  /**
   * Adds a breakpoint using a name and a media query.
   *
   * @param string $name
   *   The name of the breakpoint.
   * @param string $media_query
   *   Media query.
   */
  public function addBreakpointFromMediaQuery($name, $media_query) {
    // Use the existing breakpoint if it exists.
    $breakpoint = entity_load('breakpoint', $this->sourceType . '.' . $this->name . '.' . $name);
    if (!$breakpoint) {
      // Build a new breakpoint.
      $breakpoint = entity_create('breakpoint', array(
        'name' => $name,
        'label' => $name,
        'mediaQuery' => $media_query,
        'source' => $this->name,
        'sourceType' => $this->sourceType,
        'weight' => count($this->breakpoints),
      ));
      $breakpoint->save();
    }
    $this->breakpoints[$breakpoint->id()] = $breakpoint;
  }

  /**
   * Adds one or more breakpoints to this group.
   *
   * The breakpoint name is either the machine_name or the id of a breakpoint.
   *
   * @param array $breakpoints
   *   Array containing breakpoints keyed by their id.
   */
  public function addBreakpoints($breakpoints) {
    foreach ($breakpoints as $breakpoint_name) {
      // Check if breakpoint exists, assume $breakpoint_name is a machine name.
      $breakpoint = entity_load('breakpoint', $this->sourceType . '.' . $this->source . '.' . $breakpoint_name);
      // If the breakpoint doesn't exist, assume $breakpoint_name is an id.
      if (!$breakpoint) {
        $breakpoint = entity_load('breakpoint', $breakpoint_name);
      }
      // If the breakpoint doesn't exists, do not add it.
      if ($breakpoint) {
        // Add breakpoint to group.
        $this->breakpoints[$breakpoint->id()] = $breakpoint;
      }
    }
  }

  /**
   * Loads all breakpoints, remove non-existing ones.
   *
   * @return array
   *   Array containing breakpoints keyed by their id.
   */
  protected function loadAllBreakpoints() {
    $breakpoints = $this->breakpoints;
    $this->breakpoints = array();
    foreach ($breakpoints as $breakpoint_id) {
      $breakpoint = breakpoint_load($breakpoint_id);
      if ($breakpoint) {
        $this->breakpoints[$breakpoint_id] = $breakpoint;
      }
    }
  }
}