<?php

/**

* This class handles the modification of a task object

*/

class Task {

public $TaskId;

public $TaskName;

public $TaskDescription;

protected $TaskDataSource;

public function __construct($Id = null) {

$this->TaskDataSource = file_get_contents('Task_Data.txt');

if (strlen($this->TaskDataSource) > 0)

$this->TaskDataSource = json_decode($this->TaskDataSource); // Should decode to an array of Task objects

else

$this->TaskDataSource = array(); // If it does not, then the data source is assumed to be empty and we create an empty array

if (!$this->TaskDataSource)

$this->TaskDataSource = array(); // If it does not, then the data source is assumed to be empty and we create an empty array

if (!$this->LoadFromId($Id))

$this->Create();

}

protected function Create() {

// This function needs to generate a new unique ID for the task

// get fields values and use htmlentities for security

$this->TaskId = $this->getUniqueId();

$this->TaskName = htmlentities($_POST['InputTaskName']);

$this->TaskDescription = htmlentities($_POST['InputTaskDescription']);

// get task array

$taskDataArray = $this->TaskDataSource;

// build task subarray

$data = array("TaskId" => $this->TaskId, "TaskName" => $this->TaskName, "TaskDescription" => $this->TaskDescription);

// add task subarray to the main array

array_push($taskDataArray, $data);

// decode to json before writing back to file

$jsonData = json_encode($taskDataArray);

file_put_contents('Task_Data.txt', $jsonData);

}

protected function getUniqueId() {

// Generate uniqueId

$uniqueid = uniqid();

return $uniqueid; // Placeholder return for now

}

protected function LoadFromId($Id = null) {

$taskDataArray = $this->TaskDataSource;

if ($Id) {

$this->TaskId = $Id;

// Load details and check if passed taskId alread exist in the file Task_Data.txt

foreach ($taskDataArray as $task) {

$taskId = $task->TaskId;

if($taskId == $Id){

return $taskId;

}

}

} else

return null;

}

public function Save() {

//Assignment: Code to save task here

$taskDataArray = $this->TaskDataSource;

$taskId = $this->TaskId;

$this->TaskName = htmlentities($_POST['InputTaskName']);

$this->TaskDescription = htmlentities($_POST['InputTaskDescription']);

//echo "<script>console.log( 'Debug Objects: " . $taskId . "' );</script>";

foreach($taskDataArray as &$task){

if($task->TaskId == $taskId){

$task->TaskName = $this->TaskName;

$task->TaskDescription = $this->TaskDescription;

break; // Stop the loop after we've found the item

}

}

unset($task); // break the reference with the last element

// write back to the txt file Task_Data.txt

$jsonData = json_encode($taskDataArray);

file_put_contents('Task_Data.txt', $jsonData);

}

/*

* Function to save a task...i.e to update an existing task

*/

public function DeleteTask() {

// stores the resulting array after deleting

$tasks = array();

$taskDataArray = $this->TaskDataSource;

$taskId = $this->TaskId;

// loop through all existing tasks and skip the task to be deleted

foreach($taskDataArray as $subKey => $subArray){

// prepare build the main array

$task = array();

if($subArray->TaskId != $taskId){

//unset($taskDataArray[$subKey]);

$task = array('TaskId'=>$subArray -> TaskId, 'TaskName'=>$subArray -> TaskName, 'TaskDescription'=>$subArray -> TaskDescription);

$tasks[] = $task;

}

}

// write back to the txt file Task_Data.txt

$jsonData = json_encode($tasks);

file_put_contents('Task_Data.txt', $jsonData);

}

}

?>