<?php
//session_start();

include('classes/Core.php');


function validateDate($date, $format = 'Y-m-d H:i:s')
{
    $d = DateTime::createFromFormat($format, $date);
    return $d && $d->format($format) == $date;
}

function parseBirthday($birthday, &$msg, $errMsg){

    if (validateDate($birthday, 'd.m.Y')) {
        return $birthday = date("Y-m-d", strtotime(urldecode($birthday)));
    } else {
        $msg .= $errMsg;
    }
    return null;
}

function parseTreatmentDateTime($treatmentDateTime, &$msg, $errMsg){
    if(validateDate($treatmentDateTime, 'd.m.Y H:i')){
        return $treatmentDateTime = date("Y-m-d H:i", strtotime(urldecode($treatmentDateTime)));
    } else {
        $msg .= $errMsg;
    }
    return null;
}

function parseDate($date, &$msg, $errMsg){
    if(validateDate($date, 'd.m.Y')){
        return $date = date("Y-m-d", strtotime(urldecode($date)));
    } else {
        $msg .= $errMsg;
    }
    return null;
}

function getPatientTreatmentDayAction($date){
    $date = date("Y-m-d", strtotime(urldecode($date)));

    Core::connectDB();
    $treatmentDates = Core::getTreatmentDate($date);
    echo json_encode($treatmentDates);
    Core::closeDB();

    exit;
}

function insertWorkingTimeAction($id_staff, $beginning_date, $end_date, $matter = 'HOLIDAY'){

    echo $beginning_date;

    if(validateDate($beginning_date, 'd.m.Y H:i')){
        $beginning_date = parseTreatmentDateTime($beginning_date, $msg, "Leider ist beim Parsen ein Fehler aufgetreten.");
    }
    else if(validateDate($beginning_date, 'd.m.Y')){
        $beginning_date = parseDate($beginning_date, $msg, "Leider ist beim Parsen ein Fehler aufgetreten.");
    }
    else{
        echo "Leider konnte das Anfangsdatum nicht geparst werden.";
        exit;
    }
    //echo "'". $end_date. "'";
    if(validateDate($end_date, 'd.m.Y H:i')){
        $end_date = parseTreatmentDateTime($end_date, $msg, "Leider ist beim Parsen ein Fehler aufgetreten.");
    }
    else if(validateDate($end_date, 'd.m.Y')){
        $end_date = parseDate($end_date, $msg, "Leider ist beim Parsen ein Fehler aufgetreten.");
    }
    else{
        echo "Leider konnte das Enddatum nicht geparst werden.";
        exit;
    }

    Core::connectDB();

    if (Core::insertWorkingTime($id_staff, $beginning_date, $end_date, $matter)) {
        // everything is ok. return msg to user.
        echo "Zeiten wurde gespeichert.";
        echo $msg;
    } else {
        // cannot insert
        echo "Zeiten konnte nicht gespeichert werden.";
        echo $msg;
    }
    Core::closeDB();




    exit;
}

function insertPatientTreatmentAction($id_patient, $id_staff, $id_treatment, $treatment_date, $treatment_time_end, $treatment_date_end, $description){
    $description = (isset($description) ? urldecode($description) : '');
    $description = trim($description);

    $treatment_date = parseTreatmentDateTime($treatment_date, $msg, 'Leider ist beim Parsen des Termins ein Fehler unterlaufen.');

    $t_start = explode(" ", $treatment_date);
    $treatment_time_start = $t_start[1];

    $is_treatment_date_end = true;
    if($treatment_date_end===""){
        $treatment_date_end = $t_start[0];
        $is_treatment_date_end = false;
    }
    else{
        $treatment_date_end = date('Y-m-d', strtotime(urldecode($treatment_date_end)));

    }



    Core::connectDB();

    $treatment_obj = Core::getTreatment($id_treatment);
    $is_multiple_patients = $treatment_obj['is_multiple_patients'];

    $i_date = strtotime($t_start[0]);


    while ($i_date <= (strtotime($treatment_date_end))) {


        $i_treatment_date = date('Y-m-d', $i_date) . ' ' . $treatment_time_start;

        $i_date = strtotime( date('Y-m-d', $i_date) . ' +1 week');

        $isOnHoliday = Core::isOnHoliday($id_staff, $i_treatment_date, $treatment_time_end);

        $isNotOverlapping = Core::checkOverlappingTreatmentDates($id_staff, $i_treatment_date, $treatment_time_end);
        $isHitExactly = false;
        if($is_multiple_patients === 'true'){
            $isHitExactly = Core::isHitExactlyTreatmentDate($id_staff, $i_treatment_date, $treatment_time_end);
        }

        if (!$isOnHoliday && ($isNotOverlapping || $isHitExactly)) {

            $msg_insert = Core::insertTreatmentDate($id_patient, $id_staff, $id_treatment, $i_treatment_date, $treatment_time_end, $description);
            //$msg_insert=true;
            if ($msg_insert === true) {
                // everything is ok. return msg to user.
                echo "Termin ".$i_treatment_date." wurde gespeichert.\n";
                echo $msg;
            } else {
                // cannot insert
                echo "Fataler Fehler: Termin konnte nicht gespeichert werden.\n";
                echo $msg . '<br />' . $msg_insert;
                Core::closeDB();
                exit;
            }
        } else {
            if($isOnHoliday){
                echo "Leider konnte der Termin am ".$i_treatment_date." nicht hinzugefügt werden, da sich der Mitarbeiter im Urlaub befindet.\n";
            }
            else{
                echo "Es existiert bereits ein Termin innerhalb des Zeitintervalls am ".$i_treatment_date.".\n";
            }

            //exit;
        }


    }
    Core::closeDB();
    exit;
}

function insertStaffAction($staff) {
    $msg = "";
    if( $staff['birthday'] !== null && $staff['birthday'] !== ""){
        $birthday = parseBirthday($staff['birthday'], $msg, 'Leider ist beim Parsen des Geburtsdatums ein Fehler unterlaufen.');
    }
    $new_staff = array();
    $new_staff['surname'] = (isset($staff['surname']) ? urldecode($staff['surname']) : '');
    $new_staff['prename'] = (isset($staff['prename']) ? urldecode($staff['prename']) : '');
    $new_staff['birthday'] = $birthday;
    $new_staff['telephone'] = (isset($staff['telephone']) ? urldecode($staff['telephone']) : '');
    $new_staff['description_text'] = (isset($staff['description']) ? urldecode($staff['description']) : '');

    Core::connectDB();
    if (Core::addStaff($new_staff)) {
        // everything is ok. return msg to user.
        echo "Neuer Mitarbeiter wurde gespeichert.";
        echo $msg;
    } else {
        // cannot insert
        echo "Mitarbeiter konnte nicht gespeichert werden.";
        echo $msg;
    }
    Core::closeDB();
    exit;
}


function insertPatientAction($patient) {
    $msg = "";
    if (isset($patient['birthday']) && $patient['birthday'] !== "") {
        $birthday = parseBirthday($patient['birthday'], $msg, 'Leider ist beim Parsen des Geburtsdatums ein Fehler unterlaufen.');
    }
    $new_patient = array();
    $new_patient['surname'] = (isset($patient['surname']) ? urldecode($patient['surname']) : '');
    $new_patient['prename'] = (isset($patient['prename']) ? urldecode($patient['prename']) : '');
    //$new_patient['birthday'] = (isset($patient['birthday']) ? urldecode($patient['birthday']) : '');
    $new_patient['birthday'] = $birthday;
    $new_patient['telephone'] = (isset($patient['telephone']) ? urldecode($patient['telephone']) : '');
    $new_patient['description_text'] = (isset($patient['description']) ? urldecode($patient['description']) : '');
    $new_patient['town'] = (isset($patient['town']) ? urldecode($patient['town']) : '');
    $new_patient['zipcode'] = (isset($patient['zipcode']) ? urldecode($patient['zipcode']) : '');
    $new_patient['street'] = (isset($patient['street']) ? urldecode($patient['street']) : '');
    Core::connectDB();
    if (Core::addPatient($new_patient)) {
        // everything is ok. return msg to user.
        echo "Patient wurde gespeichert.";
        echo $msg;
    } else {
        // cannot insert
        echo "Patient konnte nicht gespeichert werden.";
        echo $msg;
    }
    Core::closeDB();
    exit;
}


function updatePatientAction($patient){
    $msg = "";
    if (isset($patient['birthday']) && $patient['birthday'] !== "") {
        $birthday = parseBirthday($patient['birthday'], $msg, 'Leider ist beim Parsen des Geburtsdatums ein Fehler unterlaufen.');
    }
    $new_patient = array();
    $new_patient['id_patient'] = $patient['id_patient'];
    $new_patient['surname'] = (isset($patient['surname']) ? urldecode($patient['surname']) : '');
    $new_patient['prename'] = (isset($patient['prename']) ? urldecode($patient['prename']) : '');
    //$new_patient['birthday'] = (isset($patient['birthday']) ? urldecode($patient['birthday']) : '');
    $new_patient['birthday'] = $birthday;
    $new_patient['telephone'] = (isset($patient['telephone']) ? urldecode($patient['telephone']) : '');
    $new_patient['description_text'] = (isset($patient['description']) ? urldecode($patient['description']) : '');
$new_patient['town'] = (isset($patient['town']) ? urldecode($patient['town']) : '');
    $new_patient['zipcode'] = (isset($patient['zipcode']) ? urldecode($patient['zipcode']) : '');
    $new_patient['street'] = (isset($patient['street']) ? urldecode($patient['street']) : '');
    Core::connectDB();
    if (Core::updatePatient($new_patient)) {
        // everything is ok. return msg to user.
        echo "Änderungen wurden gespeichert.";
        echo $msg;
    } else {
        // cannot insert
        echo "Änderungen konnten nicht gespeichert werden.";
        echo $msg;
    }
    Core::closeDB();
    exit;
}

function updateStaffAction($staff){
    $msg = "";
    if (isset($staff['birthday']) && $staff['birthday'] !== "") {
        $birthday = parseBirthday($staff['birthday'], $msg, 'Leider ist beim Parsen des Geburtsdatums ein Fehler unterlaufen.');
    }

    $new_staff = array();
    $new_staff['id_staff'] = $staff['id_staff'];
    $new_staff['active'] = (isset($staff['active']) ? urldecode($staff['active']) : 'true');
    $new_staff['surname'] = (isset($staff['surname']) ? urldecode($staff['surname']) : '');
    $new_staff['prename'] = (isset($staff['prename']) ? urldecode($staff['prename']) : '');

    $new_staff['birthday'] = $birthday;
    $new_staff['telephone'] = (isset($staff['telephone']) ? urldecode($staff['telephone']) : '');
    $new_staff['description_text'] = (isset($staff['description']) ? urldecode($staff['description']) : '');

    Core::connectDB();
    if (Core::updateStaff($new_staff)) {
        // everything is ok. return msg to user.
        echo "Änderungen wurden gespeichert.";
        echo $msg;
    } else {
        // cannot insert
        echo "Änderungen konnten nicht gespeichert werden.";
        echo $msg;
    }
    Core::closeDB();
    exit;
}


function listPatientsAction(){
    Core::connectDB();
    $patients = Core::getPatients();
    echo json_encode($patients);
    //echo var_dump($patients);
    Core::closeDB();
    exit;
}

function getPatientAction($id_patient){
    Core::connectDB();
    $patient = Core::getPatient($id_patient);
    echo json_encode($patient);
    Core::closeDB();
    exit;
}

function getPatientTreatmentAction($id_patient_treatment){
    Core::connectDB();
    $treatmentdate = Core::getPatientTreatment($id_patient_treatment);
    echo json_encode($treatmentdate);
    Core::closeDB();
    exit;
}

function getTreatmentAction($id_treatment){
    Core::connectDB();
    $treatment = Core::getTreatment($id_treatment);
    echo json_encode($treatment);
    Core::closeDB();
    exit;
}

function getStaffAction($id_staff){
    Core::connectDB();
    $staff = Core::getStaff($id_staff);
    echo json_encode($staff);
    Core::closeDB();
    exit;
}

function getTreatmentDatesAction($id_patient){
    Core::connectDB();
   $treatmentDates = Core::getTreatmentDates($id_patient);
    echo json_encode($treatmentDates);
    Core::closeDB();
    exit;
}

function getWorkingTimesAction($id_staff, $date=null){
    Core::connectDB();
    if(isset($date) && $date !== ""){
        $date = date("Y-m-d", strtotime(urldecode($date)));
    }
    $workingtimes = Core::getWorkingTimes($id_staff, $date);
    //$workingtimes = null;
    echo json_encode($workingtimes);
    Core::closeDB();
    exit;
}

function removePatientAction($id_patient){
    Core::connectDB();
    $result = Core::removePatient($id_patient);
    echo $result;
    //echo "Patient".$id_patient;
    Core::closeDB();
    exit;
}

function removeStaffAction($id_staff){
    Core::connectDB();
    $result = Core::removeStaff($id_staff);
    echo $result;
    //echo "staff".$id_staff;
    Core::closeDB();
    exit;
}

function removeWorkingTimeAction($id_staff_workingtime){
    //echo "removeWorkingTimeAction: ". $id_staff_workingtime."\n";
    Core::connectDB();
    $result = Core::removeStaffWorkingTime($id_staff_workingtime);
    //echo $result;
    //echo "Patient".$id_patient;
    Core::closeDB();
    exit;
}

function removePatientTreatmentAction($id_patient_treatment){
    Core::connectDB();
    $result = Core::removeTreatmentDate($id_patient_treatment);
    echo $result;
    //echo "testiyeah: ".$id_patient_treatment;
    //echo "Patient".$id_patient;
    Core::closeDB();
    exit;
}
function getStaffListAction(){

session_start();
    Core::connectDB();
    $staff = Core::getStaffList($_SESSION);
    echo json_encode($staff);
    //echo var_dump($staff);
    Core::closeDB();
    exit;
}

function getTreatmentsAction(){
    Core::connectDB();
    $treatments = Core::getTreatments();
    echo json_encode($treatments);
    //echo var_dump($treatments);
    Core::closeDB();
    exit;
}

function setStaffActiveCheckAction($id_staff, $checked){
    $isChecked = false;
    if($checked === "true"){
        $isChecked = true;
    }

    Core::connectDB();
    if (Core::updateStaffActiveCheck($id_staff, $checked)) {
        // everything is ok. return msg to user.
        echo "Änderungen wurden gespeichert.";

    } else {
        // cannot insert
        echo "Änderungen konnten nicht gespeichert werden.";

    }
    Core::closeDB();
}

function setPatientTreatmentCheckAction($id_patient_treatment, $checked){
    $isChecked = false;
    if($checked === "true"){
        $isChecked = true;
    }

    //exit;
    Core::connectDB();
    if (Core::updatePatientTreatmentCheck($id_patient_treatment, $checked)) {
        // everything is ok. return msg to user.
        echo "Änderungen wurden gespeichert.";
        //echo $msg;
    } else {
        // cannot insert
        echo "Änderungen konnten nicht gespeichert werden.";

    }
    Core::closeDB();

}

function checkOverlappingPatientTreatmentAction($id_patient_treatment){
    Core::connectDB();

    $patient_treatment = Core::getPatientTreatment($id_patient_treatment);
    if(Core::checkOverlappingTreatmentDates($patient_treatment['id_staff'], $patient_treatment['treatment_date'], $patient_treatment['treatment_time_end'])){
        echo "overlap";

    }
    else {
        echo "no overlap";
    }
    Core::closeDB();
    exit;
}

switch($_POST['action']){
    case 'insert_patient':
        //echo var_dump($_POST['patient']);
        insertPatientAction($_POST['patient']);
        break;
    case 'remove_patient':
        removePatientAction($_POST['id_patient']);
        break;
    case 'remove_staff':
        removeStaffAction($_POST['id_staff']);
        break;
    case 'update_patient':
        updatePatientAction($_POST['patient']);
        break;
    case 'update_staff':
        updateStaffAction($_POST['staff']);
        break;
    case 'get_patients':
        listPatientsAction();
        break;
    case 'get_patient':
        getPatientAction($_POST['id_patient']);
        break;
    case 'get_staff':
        getStaffAction($_POST['id_staff']);
        break;
    case 'get_stafflist':
        getStaffListAction();
        break;
    case 'insert_staff':
        insertStaffAction($_POST['staff']);
        break;
    case 'get_treatment':
        getTreatmentAction($_POST['id_treatment']);
        break;
    case 'get_treatments':
        getTreatmentsAction();
        break;
    case 'set_staff_active_check':
        setStaffActiveCheckAction($_POST['id_staff'], $_POST['checked']);
        break;
    case 'set_patient_treatment_check':
        setPatientTreatmentCheckAction($_POST['id_patient_treatment'], $_POST['checked']);
        break;
    case 'get_patient_treatment':
        getPatientTreatmentAction($_POST['id_patient_treatment']);
        break;
    case 'insert_patient_treatment':
        insertPatientTreatmentAction($_POST['id_patient'], $_POST['id_staff'], $_POST['id_treatment'], $_POST['treatment_date'], $_POST['treatment_time_end'], $_POST['treatment_date_end'], $_POST['description']);
        break;
    case 'remove_patient_treatment':
        removePatientTreatmentAction($_POST['id_patient_treatment']);
        break;
    case 'get_treatment_dates':
        getTreatmentDatesAction($_POST['id_patient']);
        break;
    case 'get_patient_treatment_day':
        getPatientTreatmentDayAction($_POST['date']);
        break;
    case 'insert_working_time':
        insertWorkingTimeAction($_POST['id_staff'], $_POST['beginning_date'], $_POST['end_date'], $_POST['matter']);
        break;
    case 'get_working_times':
        getWorkingTimesAction((isset($_POST['id_staff']) ? $_POST['id_staff'] : null), $_POST['date']) ;
        break;
    case 'remove_staff_workingtime':
        removeWorkingTimeAction($_POST['id_staff_workingtime']);
        break;
    default:
        break;
}