<?php

if ( !defined( 'WPINC' ) ) {
  die;
}

/**
 * Category class
 *
 * @since      1.1.0
 * @package    Activities
 * @subpackage Activities/includes
 * @author     Mikal Naustdal <miknau94@gmail.com>
 */
class Activities_Category {
  const taxonomy = 'acts_cat';

  /**
   * Add category specific actions
   */
  static function init() {
    add_action( 'init', array( __CLASS__, 'register_category_taxonomy' ) );
  }

  /**
   * Added the uncategorized category
   *
   * @return bool
   */
  static function add_uncategorized() {
    $insert = wp_insert_term(
      'Uncategorized',
      self::taxonomy
    );

    return !is_wp_error( $insert );
  }

  /**
   * Register acts category
   */
  static function register_category_taxonomy() {
    register_taxonomy(
      self::taxonomy,
      'acts_activity',
      array(
        'label' => __( 'Activity Categories' ),
        'rewrite' => false,
        'hierarchical' => true,
        'sort' => true
      )
    );
  }

  /**
   * Check if a category exists
   *
   * @param   int $id Term id
   * @return  bool
   */
  static function exists( $id ) {
    if ( $id <= 0 ) {
      return false;
    }

    return term_exists( $id, self::taxonomy );
  }

  /**
   * Get categories for an activity
   *
   * @param   int   $act_id Activity id
   * @param   bool  $display True for names, false for ids
   * @return  array
   */
  static function get_act_categories( $act_id, $display = false ) {
    if ( $display ) {
      return wp_get_object_terms( $act_id, self::taxonomy, array( 'orderby' => 'term_order', 'fields' => 'names' ) );
    }

    return wp_get_object_terms( $act_id, self::taxonomy, array( 'orderby' => 'term_order', 'fields' => 'ids' ) );
  }

  /**
   * Get activities with category or categories
   *
   * @param   int|array     $cat_id Category id or list of categories
   * @return  array         List of activity ids
   */
  static function get_activities_with_category( $cat_id ) {
    $acts = get_objects_in_term( $cat_id, self::taxonomy );

    //Remove possible duplicates
    if ( is_array( $cat_id ) ) {
      $filtered_acts = array();

      foreach ($acts as $id) {
        if ( !isset( $filtered_acts[$id] ) ) {
          $filtered_acts[$id] = $id;
        }
      }

      $acts = array_keys( $filtered_acts );
    }

    return $acts;
  }

  /**
   * Get all categories
   *
   * @return array
   */
  static function get_categories( $fields = 'all' ) {
    return get_terms( array(
      'taxonomy' => self::taxonomy,
      'hide_empty' => false,
      'fields' => $fields
    ));
  }

  /**
   * Insert a new category into the db
   *
   * @param   array            $values Category info
   * @return  array|WP_Error   The Term ID and Term Taxonomy ID.
   */
  static function insert( $values ){
    $args = array(
      'slug' => $values['slug']
    );

    if ( array_key_exists( 'desc', $values ) ) {
      $args['description'] = $values['desc'];
    }

    $parent_term = term_exists( $values['parent'], self::taxonomy );
    if ( !empty( $parent_term ) ) {
      $args['parent'] = $parent_term['term_id'];
    }

    return wp_insert_term(
      $values['name'],
      self::taxonomy,
      $args
    );
  }

  /**
   * Update category into the db
   *
   * @param   array            $values Category info
   * @return  array|WP_Error   The Term ID and Term Taxonomy ID.
   */
  static function update( $values ){
    $args = array(
      'name' => $values['name'],
      'description' => $values['desc']
    );

    $parent_term = term_exists( $values['parent'], self::taxonomy );
    if ( !empty( $parent_term ) ) {
      $args['parent'] = $parent_term['term_id'];
    }

    return wp_update_term(
      $values['id'],
      self::taxonomy,
      $args
    );
  }

  /**
   * Delete a category
   *
   * @param   int             $id Category id
   * @return  bool|WP_Error   Returns false if not term; true if completes delete action.
   */
  static function delete( $id ){
    return wp_delete_term(
      $id,
      self::taxonomy
    );
  }

  /**
   * Create a relation between activity and category
   *
   * The first ordered category is the the primary category.
   *
   * @param   int              $act_id Activity id
   * @param   array            $cats All Categories ('primary' and 'additional')
   * @return  array|WP_Error   The Term ID and Term Taxonomy ID.
   */
  static function change_category_relations( $act_id, $cats ) {
    wp_set_object_terms( $act_id, $cats, self::taxonomy );
  }
}
Activities_Category::init();