<?php

namespace Module;

class User {

    public static function init() {
        add_action('wp_ajax_get_user', array('Module\User', 'getUser'));
        add_action('wp_ajax_nopriv_get_user', array('Module\User', 'getUser'));
        
        add_action('wp_ajax_remove_calendar', array('Module\User', 'removeCalendar'));
        add_action('wp_ajax_add_calendar', array('Module\User', 'addCalendar'));
        
        add_action('delete_user', array('Module\User', 'delete'));
    }

    /*
     * Returns users calendars
     * @param int. Optional userID
     * @return json:
     * $response = [
      "admin" - is admin
      "id" - ids of calendars
      "names" - names of calendars
      "logged_in" - is user looged in
      "styling" - styling settings
      ];
     */

    public static function getUser() {
        if (isset($_POST['data'])) {
            $user_id = intval($_POST['data']);
            $current_user = get_user_by('id', $user_id);
        } else {
            $current_user = wp_get_current_user();
            $user_id = $current_user->ID;
        }
        if ($user_id == 0) {
            $logged_in = false;
        } else {
            $logged_in = true;
        }

        $calendars = [];
        $taxonomies = get_terms('alt-calendar', array(
            'hide_empty' => 0
        ));
        $names = [];
        $id = [];
        $admin = 0;
        $term_id = get_option('default_calendar');
        $default = get_term_by('term_id', $term_id, 'alt-calendar');
        $names[0] = $default->name;
        $id[0] = $default->term_id;
        if ($user_id) {
            if (isset($current_user->caps['administrator'])) {
                $admin = 1;
                foreach ($taxonomies as $cal) {
                    $calendars[] = $cal->term_id;
                }
            } else {
                $calendars = get_user_option('user_alt_calendars', $user_id);
            }
            if ($calendars) {
                foreach ($calendars as $value) {
                    $cat = get_term_by('term_id', $value, 'alt-calendar');
                    if ($cat->term_id !== $default->term_id) {
                        $names[] = $cat->name;
                        $id[] = $cat->term_id;
                    }
                }
            }
        }
        if (get_option('styling')) {
            $styling = true;
        } else {
            $styling = false;
        }
        $response = [
            "admin" => $admin,
            "id" => $id,
            "names" => $names,
            "logged_in" => $logged_in,
            "styling" => $styling
        ];
        header('Content-Type: application/json');
        echo json_encode($response);
        wp_die();
    }
    
    /*
     * Adds calendar to chosen user
     * 
     * @param data. Contains calendar_id and user_id
     * $return users calendars or error message
     */

    public static function addCalendar() {
        $data = $_POST['data'];
        
        if(!isset($data['calendar_id'])){
            wp_die();
            return;
        }
        $calendar_id = $data['calendar_id'];
        $user_id = $data['user_id'];
        $calendars = get_user_option('user_alt_calendars', $user_id);
        delete_user_meta($user_id, 'user_alt_calendars');
        if (!in_array($calendar_id, $calendars)) {
            $calendars[] = $calendar_id;
            header('Content-Type: application/json');
            echo json_encode($calendars);
        } else {
            echo 'Already in Users calendars';
        }
        add_user_meta($user_id, 'user_alt_calendars', $calendars);

        wp_die();
    }
    
     /*
     * removes calendar from user meta not from taxonomies
     * 
     * @param array. CalendarID and userID
     * @return int. UserID.
     */

    public static function removeCalendar() {
        $current_user = wp_get_current_user();
        $user_id = $current_user->ID;
        $data = $_POST['data'];
        $calendar_id = intval($data['calendar_id']);
        if ($data['user_id']) {
            $user_id = intval($data['user_id']);
        }

        $user_meta = 'user_alt_calendars';
        $calendars = get_user_option($user_meta, $user_id);
        $index = array_search($calendar_id, $calendars);

        if ($index !== NULL) {
            unset($calendars[$index]);
            delete_user_meta($user_id, $user_meta);
            add_user_meta($user_id, 'user_alt_calendars', $calendars);
        }
        $response = $calendars;
        header('Content-Type: application/json');
        echo $user_id;
        wp_die();
    }
    public static function delete($user_id){
        delete_user_meta($user_id, 'user_alt_calendars');
    }
}