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

$opd_cases = array();
$injury_cases = array();
$dates = array();
$sickness_cases = array();


$endDate = date("Y-m-d"); // Today's date
$startDate = date("Y-m-d", strtotime("-1 week")); // One week ago

for ($date = strtotime($startDate); $date <= strtotime($endDate); $date = strtotime("+1 day", $date)) {
    $formattedDate = date("d-m-Y", $date);
    $dates[$formattedDate] = $formattedDate;
    $opd_cases[$formattedDate] = 0;
    $injury_cases[$formattedDate] = 0;
    $sickness_cases[$formattedDate] = 0;
}
$ohc_id = $_SESSION['current_ohcttype'];
$sql = "SELECT DATE(appointment_date) as appointment_date, 
               SUM(CASE WHEN appointment_type = 'O' THEN 1 ELSE 0 END) as opd_count,
               SUM(CASE WHEN appointment_type = 'I' THEN 1 ELSE 0 END) as injury_count
        FROM employee_appointment
        WHERE DATE(appointment_date) BETWEEN ? AND ? AND ohc_type_id=?
        GROUP BY DATE(appointment_date)
        ORDER BY DATE(appointment_date)";

$stmt = mysqli_prepare($conn, $sql);

if (!$stmt) {
    error_log("Error preparing statement: " . mysqli_error($conn));
    die();
}

mysqli_stmt_bind_param($stmt, "sss", $startDate, $endDate, $ohc_id);
mysqli_stmt_execute($stmt);
$result = mysqli_stmt_get_result($stmt);

while ($row = mysqli_fetch_assoc($result)) {
    $formattedDate = date("d-m-Y", strtotime($row['appointment_date']));
    $opd_cases[$formattedDate] = $row['opd_count'];
    $injury_cases[$formattedDate] = $row['injury_count'];
}

mysqli_stmt_close($stmt);

$sickness_sql = "SELECT DATE(sickness_date) as sickness_date, 
                COUNT(*) as sickness_count
                FROM sickness
                WHERE DATE(sickness_date) BETWEEN ? AND ?
                GROUP BY DATE(sickness_date)";
$sickness_stmt = mysqli_prepare($conn, $sickness_sql);

if (!$sickness_stmt) {
    error_log("Error preparing sickness statement: " . mysqli_error($conn));
    die();
}

mysqli_stmt_bind_param($sickness_stmt, "ss", $startDate, $endDate);
mysqli_stmt_execute($sickness_stmt);
$sickness_result = mysqli_stmt_get_result($sickness_stmt);

while ($sickness_row = mysqli_fetch_assoc($sickness_result)) {
    $formattedDate = date("d-m-Y", strtotime($sickness_row['sickness_date']));
    $sickness_cases[$formattedDate] = $sickness_row['sickness_count'];
}

mysqli_stmt_close($sickness_stmt);


$data = array(
    'dates' => array_values($dates),
    'opd_cases' => array_values($opd_cases),
    'injury_cases' => array_values($injury_cases),
    'sickness_cases' => array_values($sickness_cases)
);

echo json_encode($data);