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<?php

require_once "../include/DbHandler.php";
require_once "../include/PassHash.php";
require ‘vendor/autoload.php’;

\Slim\Slim::registerAutoloader();

$app = new \Slim\Slim();

// User id from db - Global Variable
$user_id = NULL;

/**
 * Verifying required params posted or not
*/
function verifyRequiredParams($required_fields) {
    $error = false;
    $error_fields = "";
    $request_params = array();
    $request_params = $_REQUEST;

    // Handling PUT request params

    if ($_SERVER["REQUEST_METHOD"] == "PUT") {
        $app = \Slim\Slim::getInstance();
        parse_str($app->request()->getBody(), $request_params);
    }
    foreach ($required_fields as $field) {
        if (!isset($request_params[$field]) || strlen(trim($request_params[$field])) <= 0) {
            $error = true;
            $error_fields .= $field . ", ";
        }
    }

    if ($error) {
        // Required field(s) are missing or empty
        // echo error json and stop the app
        $response = array();
        $app = \Slim\Slim::getInstance();
        $response["error"] = true;
        $response["message"] = "Required field(s) " . substr($error_fields, 0, -2) . " is missing or empty";
        echoRespnse(400, $response);
        $app->stop();
    }
}

/**
 * Validating email address
 */
function validateEmail($email) {
    $app = \Slim\Slim::getInstance();
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $response["error"] = true;
        $response["message"] = "Email address is not valid";
        echoRespnse(400, $response);
        $app->stop();
    }
}

/**
 * Echoing json response to client
 * @param String $status_code Http response code
 * @param Int $response Json response
 */
function echoRespnse($status_code, $response) {
    $app = \Slim\Slim::getInstance();
    // Http response code
    $app->status($status_code);

    // setting response content type to json
    $app->contentType("application/json");

    echo json_encode($response);
}

/**
 * User Registration
 * url - /register
 * method - POST
 * params - name, email, password
 */
$app->post("/register", function() use ($app) {
            // check for required params
            verifyRequiredParams(array("name", "email", "password"));

            $response = array();

            // reading post params
            $name = $app->request->post("name");
            $email = $app->request->post("email");
            $password = $app->request->post("password");

            // validating email address
            validateEmail($email);

            $db = new DbHandler();
            $res = $db->createUser($name, $email, $password);

            if ($res == USER_CREATED_SUCCESSFULLY) {
                $response["error"] = false;
                $response["message"] = "You are successfully registered";
                echoRespnse(201, $response);
            } else if ($res == USER_CREATE_FAILED) {
                $response["error"] = true;
                $response["message"] = "Oops! An error occurred while registereing";
                echoRespnse(200, $response);
            } else if ($res == USER_ALREADY_EXISTED) {
                $response["error"] = true;
                $response["message"] = "Sorry, this email already existed";
                echoRespnse(200, $response);
            }
        });
/**
 * User Login
 * url - /login
 * method - POST
 * params - email, password
 */
$app->post("/login", function() use ($app) {
            // check for required params
            verifyRequiredParams(array("email", "password"));

            // reading post params
            $email = $app->request()->post("email");
            $password = $app->request()->post("password");
            $response = array();

            $db = new DbHandler();
            // check for correct email and password
            if ($db->checkLogin($email, $password)) {
                // get the user by email
                $user = $db->getUserByEmail($email);

                if ($user != NULL) {
                    $response["error"] = false;
                    $response["name"] = $user["name"];
                    $response["email"] = $user["email"];
                    $response["apiKey"] = $user["api_key"];
                    $response["createdAt"] = $user["created_at"];
                } else {
                    // unknown error occurred
                    $response["error"] = true;
                    $response["message"] = "An error occurred. Please try again";
                }
            } else {
                // user credentials are wrong
                $response["error"] = true;
                $response["message"] = "Login failed. Incorrect credentials";
            }

            echoRespnse(200, $response);
        });
/**
 * Adding Middle Layer to authenticate every request
 * Checking if the request has valid api key in the "Authorization" header
 */
function authenticate(\Slim\Route $route) {
    // Getting request headers
    $headers = apache_request_headers();
    $response = array();
    $app = \Slim\Slim::getInstance();

    // Verifying Authorization Header
    if (isset($headers["Authorization"])) {
        $db = new DbHandler();

        // get the api key
        $api_key = $headers["Authorization"];
        // validating api key
        if (!$db->isValidApiKey($api_key)) {
            // api key is not present in users table
            $response["error"] = true;
            $response["message"] = "Access Denied. Invalid Api key";
            echoRespnse(401, $response);
            $app->stop();
        } else {
            global $user_id;
            // get user primary key id
            $user = $db->getUserId($api_key);
            if ($user != NULL)
                $user_id = $user["id"];
        }
    } else {
        // api key is missing in header
        $response["error"] = true;
        $response["message"] = "Api key is misssing";
        echoRespnse(400, $response);
        $app->stop();
    }
}

/**
 * Creating new task in db
 * method POST
 * params - name
 * url - /tasks/
 */
$app->post("/tasks", "authenticate", function() use ($app) {
            // check for required params
            verifyRequiredParams(array("task"));

            $response = array();
            $task = $app->request->post("task");

            global $user_id;
            $db = new DbHandler();

            // creating new task
            $task_id = $db->createTask($user_id, $task);

            if ($task_id != NULL) {
                $response["error"] = false;
                $response["message"] = "Task created successfully";
                $response["task_id"] = $task_id;
            } else {
                $response["error"] = true;
                $response["message"] = "Failed to create task. Please try again";
            }
            echoRespnse(201, $response);
        });

/**
 * Listing all tasks of particual user
 * method GET
 * url /tasks
 */
$app->get("/tasks", "authenticate", function() {
            global $user_id;
            $response = array();
            $db = new DbHandler();

            // fetching all user tasks
            $result = $db->getAllUserTasks($user_id);

            $response["error"] = false;
            $response["tasks"] = array();

            // looping through result and preparing tasks array
            while ($task = $result->fetch_assoc()) {
                $tmp = array();
                $tmp["id"] = $task["id"];
                $tmp["task"] = $task["task"];
                $tmp["status"] = $task["status"];
                $tmp["createdAt"] = $task["created_at"];
                array_push($response["tasks"], $tmp);
            }

            echoRespnse(200, $response);
        });

/**
 * Listing single task of particual user
 * method GET
 * url /tasks/:id
 * Will return 404 if the task doesn"t belongs to user
 */
$app->get("/tasks/:id", "authenticate", function($task_id) {
            global $user_id;
            $response = array();
            $db = new DbHandler();

            // fetch task
            $result = $db->getTask($task_id, $user_id);

            if ($result != NULL) {
                $response["error"] = false;
                $response["id"] = $result["id"];
                $response["task"] = $result["task"];
                $response["status"] = $result["status"];
                $response["createdAt"] = $result["created_at"];
                echoRespnse(200, $response);
            } else {
                $response["error"] = true;
                $response["message"] = "The requested resource doesn"t exists";
                echoRespnse(404, $response);
            }
        });

/**
 * Updating existing task
 * method PUT
 * params task, status
 * url - /tasks/:id
 */
$app->put("/tasks/:id", "authenticate", function($task_id) use($app) {
            // check for required params
            verifyRequiredParams(array("task", "status"));

            global $user_id;
            $task = $app->request->put("task");
            $status = $app->request->put("status");

            $db = new DbHandler();
            $response = array();

            // updating task
            $result = $db->updateTask($user_id, $task_id, $task, $status);
            if ($result) {
                // task updated successfully
                $response["error"] = false;
                $response["message"] = "Task updated successfully";
            } else {
                // task failed to update
                $response["error"] = true;
                $response["message"] = "Task failed to update. Please try again!";
            }
            echoRespnse(200, $response);
        });

/**
 * Deleting task. Users can delete only their tasks
 * method DELETE
 * url /tasks
 */
$app->delete("/tasks/:id", "authenticate", function($task_id) use($app) {
            global $user_id;

            $db = new DbHandler();
            $response = array();
            $result = $db->deleteTask($user_id, $task_id);
            if ($result) {
                // task deleted successfully
                $response["error"] = false;
                $response["message"] = "Task deleted succesfully";
            } else {
                // task failed to delete
                $response["error"] = true;
                $response["message"] = "Task failed to delete. Please try again!";
            }
            echoRespnse(200, $response);
        });

$app->run();

?>