<?php
/**
 * If the user is logged in and a Lecturer doesn't exists in the database,
 * add the new lecturer to the database.
 *
 *
 *
 */
require_once("../../../objects/MySQL.php");
require_once("../../../objects/JWT.php");
require_once("../../../objects/Lecturer.php");
require_once("../../../utils/Utils.php");

try {

    $headers = getallheaders();
    if(array_key_exists("Authorization", $headers)) {

        $jwt = JWT::decode($headers["Authorization"]);
    } else {

        echo(json_encode(array('ok' => false, 'simple_error' => 'Authorization failure.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: Missing Authorization header in request.')));
        Utils::http_response_code(400);
        return;
    } // This checks the auth.
} catch (Exception $e) {

    echo(json_encode(array('ok' => false, 'simple_error' => 'Authorization failure.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: ' . $e->getMessage())));
    Utils::http_response_code(500);
    return;
}

if($jwt->getRole() == "USER") {

    try {

        $mySQL = new MySQL();
        $connection = $mySQL->getConnection();
    } catch (Exception $e) {

        echo(json_encode(array('ok' => false, 'simple_error' => 'Internal server error, contact a system administrator.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: ' . $e->getMessage())));
        Utils::http_response_code(500);
        return;
    }

    if ($json_data = file_get_contents('php://input')) {

        $json_object = json_decode($json_data, true);
        if (is_array($json_object)) {

            if (array_key_exists('name', $json_object)) {

                if (array_key_exists('department_id', $json_object)) {

                    try {

                        if ($stmt = $connection->prepare("SELECT `name` FROM `Lecturer` WHERE `name`=?")) {

                            $stmt->bind_param('s', $name);
                            if (!$stmt->execute()) {

                                echo(json_encode(array('ok' => false, 'simple_error' => 'Internal server error, contact a system administrator.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: ' . $stmt->error . '.')));
                                Utils::http_response_code(500);
                                return;
                            }
                            $stmt->bind_result($real_name);
                            if (is_null($stmt->fetch())) {

                                $real_name = null;
                            }
                            $stmt->close();

                            if (is_null($real_name)) {

                                $lecturer = new Lecturer($mySQL, -1, $name, $department_id);
                                $lecturer->saveToMySQL();
                                echo(json_encode(array('ok' => true, 'response' => $lecturer->toArray())));
                                if ($error = json_last_error()) {

                                    echo(json_encode(array('ok' => false, 'simple_error' => 'Internal server error, contact a system administrator.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: json_encode failed with code(' . $error . ').')));
                                    Utils::http_response_code(500);
                                    return;
                                }
                                return;
                            } else {
                                echo $real_name;
                                echo(json_encode(array('ok' => false, 'simple_error' => 'A lecturer with that name already exists in the database.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: ' . 'Failed to add new lecturer with name ' . $name . '.')));
                                Utils::http_response_code(400);
                                return;
                            }
                        } else {

                            echo(json_encode(array('ok' => false, 'simple_error' => 'Internal server error, contact a system administrator.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: ' . 'Failed to prepare statement for checking if lecturer name already in database.')));
                            Utils::http_response_code(500);
                            return;
                        }
                    } catch (Exception $e) {

                        echo(json_encode(array('ok' => false, 'simple_error' => 'Internal server error, contact a system administrator.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: ' . 'Failed to add new lecturer with name ' . $name . '.')));
                        Utils::http_response_code(500);
                        return;
                    }
                } else {

                    echo(json_encode(array('ok' => false, 'simple_error' => 'User panel request error.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: ' . 'Parameter department_id is unset.')));
                    Utils::http_response_code(400);
                    return;
                }
            } else {

                echo(json_encode(array('ok' => false, 'simple_error' => 'User panel request error.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: ' . 'Parameter name is unset.')));
                Utils::http_response_code(400);
                return;
            }
        }else {

            echo(json_encode(array('ok' => false, 'simple_error' => 'User panel request error.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: ' . 'Failed to decode JSON. Data:' . $json_data)));
            Utils::http_response_code(400);
            return;
        }
    } else {

        echo(json_encode(array('ok' => false, 'simple_error' => 'User panel request error.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: ' . 'No JSON object was provided.')));
        Utils::http_response_code(400);
    }
}else {

    echo(json_encode(array('ok' => false, 'simple_error' => 'You do no have permission to perform this function.', 'detailed_error' => 'Error at ' . basename(__FILE__) . ":" . __LINE__ . '. Message: User had role ' . $jwt->getRole() . ' and tried to access user methods.')));
    Utils::http_response_code(403);
    return;
}