MaketRandevu/doc/thesis/snippets/provider_appointment_hours.php

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<?php
/**
* [AJAX] Get the available appointment hours for the given date.
*
* This method answers to an AJAX request. It calculates the
* available hours for thegiven service, provider and date.
*
* @param numeric $_POST['service_id'] The selected service's
* record id.
* @param numeric $_POST['provider_id'] The selected provider's
* record id.
* @param string $_POST['selected_date'] The selected date of
* which the available hours we want to see.
* @param numeric $_POST['service_duration'] The selected service
* duration in minutes.
* @param string $_POST['manage_mode'] Contains either 'true' or
* 'false' and determines the if current user is managing an already
* booked appointment or not.
* @return Returns a json object with the available hours.
*/
public function ajax_get_available_hours() {
$this->load->model('providers_model');
$this->load->model('appointments_model');
$this->load->model('settings_model');
try {
// If manage mode is TRUE then the following we should not
// consider the selected appointment when calculating the
// available time periods of the provider.
$exclude_appointments = ($_POST['manage_mode'] === 'true')
? array($_POST['appointment_id'])
: array();
$empty_periods = $this->get_provider_available_time_periods(
$_POST['provider_id'], $_POST['selected_date'],
$exclude_appointments);
// Calculate the available appointment hours for the given
// date. The empty spaces are broken down to 15 min and if
// the service fit in each quarter then a new available hour
// is added to the "$available_hours" array.
$available_hours = array();
foreach ($empty_periods as $period) {
$start_hour = new DateTime($_POST['selected_date']
. ' ' . $period['start']);
$end_hour = new DateTime($_POST['selected_date']
. ' ' . $period['end']);
$minutes = $start_hour->format('i');
if ($minutes % 15 != 0) {
// Change the start hour of the current space in
// order to be on of the following: 00, 15, 30, 45.
if ($minutes < 15) {
$start_hour->setTime($start_hour->format('H'), 15);
} else if ($minutes < 30) {
$start_hour->setTime($start_hour->format('H'), 30);
} else if ($minutes < 45) {
$start_hour->setTime($start_hour->format('H'), 45);
} else {
$start_hour->setTime($start_hour->format('H') + 1, 00);
}
}
$current_hour = $start_hour;
$diff = $current_hour->diff($end_hour);
while (($diff->h * 60 + $diff->i)
> intval($_POST['service_duration'])) {
$available_hours[] = $current_hour->format('H:i');
$current_hour->add(new DateInterval("PT15M"));
$diff = $current_hour->diff($end_hour);
}
}
// If the selected date is today, remove past hours. It is
// important include the timeout before booking that is set
// in the backoffice 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.
if (date('m/d/Y', strtotime($_POST['selected_date']))
== date('m/d/Y')) {
if ($_POST['manage_mode'] === 'true') {
$book_advance_timeout = 0;
} else {
$book_advance_timeout =
$this->settings_model->get_setting('book_advance_timeout');
}
foreach($available_hours as $index => $value) {
$available_hour = strtotime($value);
$current_hour = strtotime('+' . $book_advance_timeout
. ' minutes', strtotime('now'));
if ($available_hour <= $current_hour) {
unset($available_hours[$index]);
}
}
}
$available_hours = array_values($available_hours);
echo json_encode($available_hours);
} catch(Exception $exc) {
echo json_encode(array(
'exceptions' => array(exceptionToJavaScript($exc))
));
}
}