590 lines
22 KiB
PHP
590 lines
22 KiB
PHP
<?php defined('BASEPATH') or exit('No direct script access allowed');
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/* ----------------------------------------------------------------------------
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* Easy!Appointments - Open Source Web Scheduler
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*
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* @package EasyAppointments
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* @author A.Tselegidis <alextselegidis@gmail.com>
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* @copyright Copyright (c) 2013 - 2020, Alex Tselegidis
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* @license http://opensource.org/licenses/GPL-3.0 - GPLv3
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* @link http://easyappointments.org
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* @since v1.4.0
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* ---------------------------------------------------------------------------- */
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/**
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* Class Availability
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*
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* Handles the availability generation of providers, based on their working plan and their schedule.
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*/
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class Availability {
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/**
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* @var EA_Controller
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*/
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protected $CI;
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/**
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* Availability constructor.
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*/
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public function __construct()
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{
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$this->CI =& get_instance();
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$this->CI->load->model('providers_model');
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$this->CI->load->model('secretaries_model');
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$this->CI->load->model('secretaries_model');
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$this->CI->load->model('admins_model');
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$this->CI->load->model('appointments_model');
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$this->CI->load->model('settings_model');
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$this->CI->load->library('ics_file');
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}
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/**
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* Get the available hours of a provider.
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*
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* @param string $date Selected date (Y-m-d).
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* @param array $service Service record.
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* @param array $provider Provider record.
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* @param int|null $exclude_appointment_id Exclude an appointment from the availability generation.
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*
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* @return array
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*
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* @throws Exception
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*/
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public function get_available_hours($date, $service, $provider, $exclude_appointment_id = NULL)
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{
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$available_periods = $this->get_available_periods($date, $provider, $exclude_appointment_id);
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$available_hours = $this->generate_available_hours($date, $service, $available_periods);
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if ($service['attendants_number'] > 1)
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{
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$available_hours = $this->consider_multiple_attendants($date, $service, $provider, $exclude_appointment_id);
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}
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return $this->consider_book_advance_timeout($date, $available_hours, $provider);
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}
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/**
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* Get an array containing the free time periods (start - end) of a selected date.
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*
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* This method is very important because there are many cases where the system needs to know when a provider is
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* available for an appointment. This method will return an array that belongs to the selected date and contains
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* values that have the start and the end time of an available time period.
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*
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* @param string $date Select date string.
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* @param array $provider Provider record.
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* @param int|null $exclude_appointment_id Exclude an appointment from the availability generation.
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*
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* @return array Returns an array with the available time periods of the provider.
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*
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* @throws Exception
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*/
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protected function get_available_periods(
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$date,
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$provider,
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$exclude_appointment_id = NULL
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)
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{
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// Get the service, provider's working plan and provider appointments.
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$working_plan = json_decode($provider['settings']['working_plan'], TRUE);
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// Get the provider's working plan exceptions.
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$working_plan_exceptions = json_decode($provider['settings']['working_plan_exceptions'], TRUE);
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$conditions = [
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'id_users_provider' => $provider['id'],
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];
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// Sometimes it might be necessary to exclude an appointment from the calculation (e.g. when editing an
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// existing appointment).
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if ($exclude_appointment_id)
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{
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$conditions['id !='] = $exclude_appointment_id;
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}
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$appointments = $this->CI->appointments_model->get_batch($conditions);
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// Find the empty spaces on the plan. The first split between the plan is due to a break (if any). After that
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// every reserved appointment is considered to be a taken space in the plan.
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$working_day = strtolower(date('l', strtotime($date)));
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$date_working_plan = $working_plan[$working_day] ?? NULL;
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// Search if the $date is an custom availability period added outside the normal working plan.
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if (isset($working_plan_exceptions[$date]))
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{
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$date_working_plan = $working_plan_exceptions[$date];
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}
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$periods = [];
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if (isset($date_working_plan['breaks']))
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{
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$periods[] = [
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'start' => $date_working_plan['start'],
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'end' => $date_working_plan['end']
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];
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$day_start = new DateTime($date_working_plan['start']);
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$day_end = new DateTime($date_working_plan['end']);
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// Split the working plan to available time periods that do not contain the breaks in them.
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foreach ($date_working_plan['breaks'] as $index => $break)
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{
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$break_start = new DateTime($break['start']);
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$break_end = new DateTime($break['end']);
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if ($break_start < $day_start)
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{
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$break_start = $day_start;
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}
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if ($break_end > $day_end)
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{
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$break_end = $day_end;
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}
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if ($break_start >= $break_end)
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{
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continue;
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}
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foreach ($periods as $key => $period)
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{
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$period_start = new DateTime($period['start']);
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$period_end = new DateTime($period['end']);
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$remove_current_period = FALSE;
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if ($break_start > $period_start && $break_start < $period_end && $break_end > $period_start)
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{
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$periods[] = [
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'start' => $period_start->format('H:i'),
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'end' => $break_start->format('H:i')
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];
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$remove_current_period = TRUE;
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}
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if ($break_start < $period_end && $break_end > $period_start && $break_end < $period_end)
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{
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$periods[] = [
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'start' => $break_end->format('H:i'),
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'end' => $period_end->format('H:i')
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];
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$remove_current_period = TRUE;
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}
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if ($break_start == $period_start && $break_end == $period_end)
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{
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$remove_current_period = TRUE;
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}
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if ($remove_current_period)
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{
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unset($periods[$key]);
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}
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}
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}
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}
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// Break the empty periods with the reserved appointments.
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foreach ($appointments as $appointment)
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{
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foreach ($periods as $index => &$period)
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{
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$appointment_start = new DateTime($appointment['start_datetime']);
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$appointment_end = new DateTime($appointment['end_datetime']);
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if ($appointment_start >= $appointment_end)
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{
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continue;
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}
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$period_start = new DateTime($date . ' ' . $period['start']);
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$period_end = new DateTime($date . ' ' . $period['end']);
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if ($appointment_start <= $period_start && $appointment_end <= $period_end && $appointment_end <= $period_start)
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{
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// The appointment does not belong in this time period, so we will not change anything.
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continue;
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}
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else
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{
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if ($appointment_start <= $period_start && $appointment_end <= $period_end && $appointment_end >= $period_start)
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{
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// The appointment starts before the period and finishes somewhere inside. We will need to break
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// this period and leave the available part.
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$period['start'] = $appointment_end->format('H:i');
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}
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else
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{
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if ($appointment_start >= $period_start && $appointment_end < $period_end)
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{
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// The appointment is inside the time period, so we will split the period into two new
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// others.
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unset($periods[$index]);
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$periods[] = [
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'start' => $period_start->format('H:i'),
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'end' => $appointment_start->format('H:i')
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];
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$periods[] = [
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'start' => $appointment_end->format('H:i'),
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'end' => $period_end->format('H:i')
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];
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}
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else if ($appointment_start == $period_start && $appointment_end == $period_end)
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{
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unset($periods[$index]); // The whole period is blocked so remove it from the available periods array.
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}
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else
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{
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if ($appointment_start >= $period_start && $appointment_end >= $period_start && $appointment_start <= $period_end)
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{
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// The appointment starts in the period and finishes out of it. We will need to remove
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// the time that is taken from the appointment.
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$period['end'] = $appointment_start->format('H:i');
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}
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else
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{
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if ($appointment_start >= $period_start && $appointment_end >= $period_end && $appointment_start >= $period_end)
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{
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// The appointment does not belong in the period so do not change anything.
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continue;
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}
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else
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{
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if ($appointment_start <= $period_start && $appointment_end >= $period_end && $appointment_start <= $period_end)
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{
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// The appointment is bigger than the period, so this period needs to be removed.
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unset($periods[$index]);
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}
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}
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}
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}
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}
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}
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}
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}
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return array_values($periods);
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}
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/**
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* Calculate the available appointment hours.
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*
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* Calculate the available appointment hours for the given date. The empty spaces
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* are broken down to 15 min and if the service fit in each quarter then a new
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* available hour is added to the "$available_hours" array.
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*
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* @param string $date Selected date (Y-m-d).
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* @param array $service Service record.
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* @param array $empty_periods Empty periods as generated by the "get_provider_available_time_periods"
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* method.
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*
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* @return array Returns an array with the available hours for the appointment.
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*
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* @throws Exception
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*/
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protected function generate_available_hours(
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$date,
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$service,
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$empty_periods
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)
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{
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$available_hours = [];
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foreach ($empty_periods as $period)
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{
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$start_hour = new DateTime($date . ' ' . $period['start']);
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$end_hour = new DateTime($date . ' ' . $period['end']);
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$interval = $service['availabilities_type'] === AVAILABILITIES_TYPE_FIXED ? (int)$service['duration'] : 15;
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$current_hour = $start_hour;
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$diff = $current_hour->diff($end_hour);
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while (($diff->h * 60 + $diff->i) >= (int)$service['duration'] && $diff->invert === 0)
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{
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$available_hours[] = $current_hour->format('H:i');
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$current_hour->add(new DateInterval('PT' . $interval . 'M'));
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$diff = $current_hour->diff($end_hour);
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}
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}
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return $available_hours;
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}
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/**
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* Get multiple attendants hours.
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*
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* This method will add the additional appointment hours whenever a service accepts multiple attendants.
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*
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* @param string $date Selected date (Y-m-d).
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* @param array $service Service record.
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* @param array $provider Provider record.
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* @param int|null $exclude_appointment_id Exclude an appointment from the availability generation.
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*
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* @return array Returns the available hours array.
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*
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* @throws Exception
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*/
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protected function consider_multiple_attendants(
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$date,
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$service,
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$provider,
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$exclude_appointment_id = NULL
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)
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{
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$unavailability_events = $this->CI->appointments_model->get_batch([
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'is_unavailable' => TRUE,
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'DATE(start_datetime)' => $date,
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'id_users_provider' => $provider['id']
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]);
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$working_plan = json_decode($provider['settings']['working_plan'], TRUE);
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$working_plan_exceptions = json_decode($provider['settings']['working_plan_exceptions'], TRUE);
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$working_day = strtolower(date('l', strtotime($date)));
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$date_working_plan = $working_plan[$working_day] ?? NULL;
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// Search if the $date is an custom availability period added outside the normal working plan.
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if (isset($working_plan_exceptions[$date]))
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{
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$date_working_plan = $working_plan_exceptions[$date];
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}
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if ( ! $date_working_plan)
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{
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return [];
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}
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$periods = [
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[
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'start' => new DateTime($date . ' ' . $date_working_plan['start']),
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'end' => new DateTime($date . ' ' . $date_working_plan['end'])
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]
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];
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$periods = $this->remove_breaks($date, $periods, $date_working_plan['breaks']);
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$periods = $this->remove_unavailability_events($periods, $unavailability_events);
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$hours = [];
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$interval_value = $service['availabilities_type'] == AVAILABILITIES_TYPE_FIXED ? $service['duration'] : '15';
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$interval = new DateInterval('PT' . (int)$interval_value . 'M');
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$duration = new DateInterval('PT' . (int)$service['duration'] . 'M');
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foreach ($periods as $period)
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{
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$slot_start = clone $period['start'];
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$slot_end = clone $slot_start;
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$slot_end->add($duration);
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while ($slot_end <= $period['end'])
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{
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// Make sure there is no other service appointment for this time slot.
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$other_service_attendants_number = $this->CI->appointments_model->get_other_service_attendants_number(
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$slot_start,
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$slot_end,
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$service['id'],
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$provider['id'],
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$exclude_appointment_id
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);
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if ($other_service_attendants_number > 0)
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{
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$slot_start->add($interval);
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$slot_end->add($interval);
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continue;
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}
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// Check reserved attendants for this time slot and see if current attendants fit.
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$appointment_attendants_number = $this->CI->appointments_model->get_attendants_number_for_period(
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$slot_start,
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$slot_end,
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$service['id'],
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$provider['id'],
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$exclude_appointment_id
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);
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if ($appointment_attendants_number < $service['attendants_number'])
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{
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$hours[] = $slot_start->format('H:i');
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}
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$slot_start->add($interval);
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$slot_end->add($interval);
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}
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}
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return $hours;
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}
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/**
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* Remove breaks from available time periods.
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*
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* @param string $selected_date Selected data (Y-m-d format).
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* @param array $periods Time periods of the current date.
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* @param array $breaks Breaks array for the current date.
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*
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* @return array Returns the available time periods without the breaks.
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* @throws Exception
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*/
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public function remove_breaks($selected_date, $periods, $breaks)
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{
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if ( ! $breaks)
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{
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return $periods;
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}
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foreach ($breaks as $break)
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{
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$break_start = new DateTime($selected_date . ' ' . $break['start']);
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$break_end = new DateTime($selected_date . ' ' . $break['end']);
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foreach ($periods as &$period)
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{
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$period_start = $period['start'];
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$period_end = $period['end'];
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if ($break_start <= $period_start && $break_end >= $period_start && $break_end <= $period_end)
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{
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// left
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$period['start'] = $break_end;
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continue;
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}
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if ($break_start >= $period_start && $break_start <= $period_end && $break_end >= $period_start && $break_end <= $period_end)
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{
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// middle
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$period['end'] = $break_start;
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$periods[] = [
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'start' => $break_end,
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'end' => $period_end
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];
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continue;
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}
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if ($break_start >= $period_start && $break_start <= $period_end && $break_end >= $period_end)
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{
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// right
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$period['end'] = $break_start;
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continue;
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}
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if ($break_start <= $period_start && $break_end >= $period_end)
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{
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// break contains period
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$period['start'] = $break_end;
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continue;
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}
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}
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}
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return $periods;
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}
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/**
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* Remove the unavailability entries from the available time periods of the selected date.
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*
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* @param array $periods Available time periods.
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* @param array $unavailability_events Unavailability events of the current date.
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*
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* @return array Returns the available time periods without the unavailability events.
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*
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* @throws Exception
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*/
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public function remove_unavailability_events($periods, $unavailability_events)
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{
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foreach ($unavailability_events as $unavailability_event)
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{
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$unavailability_start = new DateTime($unavailability_event['start_datetime']);
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$unavailability_end = new DateTime($unavailability_event['end_datetime']);
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foreach ($periods as &$period)
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{
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$period_start = $period['start'];
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$period_end = $period['end'];
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if ($unavailability_start <= $period_start && $unavailability_end >= $period_start && $unavailability_end <= $period_end)
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{
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// left
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$period['start'] = $unavailability_end;
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continue;
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}
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if ($unavailability_start >= $period_start && $unavailability_start <= $period_end && $unavailability_end >= $period_start && $unavailability_end <= $period_end)
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{
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// middle
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$period['end'] = $unavailability_start;
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$periods[] = [
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'start' => $unavailability_end,
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'end' => $period_end
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];
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continue;
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}
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if ($unavailability_start >= $period_start && $unavailability_start <= $period_end && $unavailability_end >= $period_end)
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{
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// right
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$period['end'] = $unavailability_start;
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continue;
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}
|
|
|
|
if ($unavailability_start <= $period_start && $unavailability_end >= $period_end)
|
|
{
|
|
// Unavailability contains period
|
|
$period['start'] = $unavailability_end;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
return $periods;
|
|
}
|
|
|
|
/**
|
|
* Consider the book advance timeout and remove available hours that have passed the threshold.
|
|
*
|
|
* If the selected date is today, remove past hours. It is important include the timeout before booking
|
|
* that is set in the back-office the system. Normally we might want the customer to book an appointment
|
|
* that is at least half or one hour from now. The setting is stored in minutes.
|
|
*
|
|
* @param string $selected_date The selected date.
|
|
* @param array $available_hours Already generated available hours.
|
|
* @param array $provider Provider information.
|
|
*
|
|
* @return array Returns the updated available hours.
|
|
*
|
|
* @throws Exception
|
|
*/
|
|
protected function consider_book_advance_timeout($selected_date, $available_hours, $provider)
|
|
{
|
|
$provider_timezone = new DateTimeZone($provider['timezone']);
|
|
|
|
$book_advance_timeout = $this->CI->settings_model->get_setting('book_advance_timeout');
|
|
|
|
$threshold = new DateTime('+' . $book_advance_timeout . ' minutes', $provider_timezone);
|
|
|
|
foreach ($available_hours as $index => $value)
|
|
{
|
|
$available_hour = new DateTime($selected_date . ' ' . $value, $provider_timezone);
|
|
|
|
if ($available_hour->getTimestamp() <= $threshold->getTimestamp())
|
|
{
|
|
unset($available_hours[$index]);
|
|
}
|
|
}
|
|
|
|
$available_hours = array_values($available_hours);
|
|
sort($available_hours, SORT_STRING);
|
|
return array_values($available_hours);
|
|
}
|
|
}
|