<?php
include('includes/config/config.php');

$sql = "SELECT pm.patient_name AS name, ct.checkup_type_name AS exam_type, cf.checkup_date AS prev_exam_date, cf.valid_upto AS due_date
        FROM checkup_form cf
        LEFT JOIN patient_master pm ON cf.emp_id = pm.id
        LEFT JOIN checkup_type ct ON ct.checkup_type_id = cf.checkup_type_id
        WHERE cf.valid_upto != '0000-00-00' 
        AND date(cf.valid_upto) != date(cf.checkup_date)
        AND cf.valid_upto <= CURDATE() + INTERVAL 30 DAY 
        AND ct.type_state != 'yes'
        GROUP BY cf.emp_id 
        ORDER BY cf.emp_id";

$result = mysqli_query($conn, $sql);
$data = array();

while ($row = mysqli_fetch_assoc($result)) {
    $prev_exam_date = date('d-m-Y', strtotime($row['prev_exam_date']));
    $due_date = date('d-m-Y', strtotime($row['due_date']));
    $data[] = array(
        "name" => $row['name'],
        "exam_type" => $row['exam_type'],
        "prev_exam_date" => $prev_exam_date,
        "due_date" => $due_date
    );
}

$response = array(
    "data" => $data
);
error_log('due data' . json_encode($data));
echo json_encode($response);