<?php
	header("Access-Control-Allow-Origin: *");
	header('Content-Type: application/json');	

	include 'config.php';

	$requestData = $_REQUEST;
	$columns = array(
		0 => 'id',
		1 => 'exam_id',
		2 => 'exam_name',
		3 => 'subject_name',
		4 => 'no_of_question',
	    5 => 'marks_for_subject',
	    6 => 'date_added',
	    7 => 'status'
	);

	$getDataQuery  = "SELECT pt.id,pt.exam_id,pt.subject_name,pt.no_of_question,pt.marks_for_subject,pt.date_added,pt.status,exams.exam_name FROM sp_exam_pattern AS pt LEFT JOIN sp_exam AS exams ON exams.exam_id=pt.exam_id WHERE pt.exam_id !=''  ";
	$getData=$db->prepare($getDataQuery);
	$getData->execute();
	$totalData = $getData->rowCount();
	$totalFiltered = $totalData;

	$searchTerms = "";
	if (!empty($requestData['search']['value'])) {
		$searchTerms .= " AND ( pt.marks_for_subject LIKE '" . $requestData['search']['value'] . "%' ";
		$searchTerms .= " OR pt.exam_id LIKE '%" . $requestData['search']['value'] . "%' ";
		$searchTerms .= " OR pt.subject_name LIKE '%" . $requestData['search']['value'] . "%' ";
		$searchTerms .= " OR pt.no_of_question LIKE '%" . $requestData['search']['value'] . "%' ";
		$searchTerms .= " OR exams.exam_name LIKE '%" . $requestData['search']['value'] . "%' ) ";
	}

	$getDataQuery  = "SELECT pt.id,pt.exam_id,pt.subject_name,pt.no_of_question,pt.marks_for_subject,pt.date_added,pt.status,exams.exam_name FROM  sp_exam_pattern AS pt LEFT JOIN sp_exam AS exams ON exams.exam_id=pt.exam_id WHERE pt.exam_id !=''  $searchTerms";

	$getData=$db->prepare($getDataQuery);
	$getData->execute();
	$totalFiltered = $getData->rowCount();

	$getDataQuery .= " ORDER BY " . $columns[$requestData['order'][0]['column']] . " " . $requestData['order'][0]['dir'] . "  LIMIT " . $requestData['start'] . ", " . $requestData['length'] . "   ";

	$getData=$db->prepare($getDataQuery);
	$getData->execute();

	$data = array();
	while ($querydata = $getData->fetch()) {

		$nestedData = array();
		$nestedData["id"] = $querydata['id'];
		$nestedData["exam_id"] = $querydata['exam_id'];
		$nestedData["exam_name"] = $querydata['exam_name'];
		$nestedData["subject_name"] = $querydata['subject_name'];
		$nestedData["no_of_question"] = $querydata['no_of_question'];
		$nestedData["marks_for_subject"] = $querydata['marks_for_subject'];
	    $nestedData["date_added"] = $querydata['date_added'];
	    $nestedData["status"] = $querydata['status'];
		$data[] = $nestedData;
	}

	$json_data = array(
		"draw"            => intval($requestData['draw']),
		"recordsTotal"    => intval($totalData),
		"recordsFiltered" => intval($totalFiltered),
		"data"            => $data
	);
	echo json_encode($json_data);
?>