<?php
// Assuming you have the database connection established already
require("../../mainconfig.php");

// Function to calculate the total number of pages based on the number of records per page
function getTotalPages($totalRecords, $recordsPerPage) {
    return ceil($totalRecords / $recordsPerPage);
}

// Function to search for staff members based on the search query
function searchStaff($searchQuery, $offset, $recordsPerPage, &$totalRecords) {
    global $db;

    // Add SQL injection protection
    $searchQuery = mysqli_real_escape_string($db, $searchQuery);

    $query = "SELECT * FROM staff WHERE name LIKE '%$searchQuery%' ORDER BY id DESC LIMIT $recordsPerPage OFFSET $offset";
    $result = mysqli_query($db, $query);

    $data = array();
    while ($row = mysqli_fetch_assoc($result)) {
        $data[] = array(
            "id" => $row['id'],
            "name" => $row['name'],
            "contact" => $row['contact'],
            "level" => $row['level'],
        );
    }

    // Get the total number of records that match the search query
    $totalRecordsQuery = "SELECT COUNT(*) AS total FROM staff WHERE name LIKE '%$searchQuery%'";
    $totalRecordsResult = mysqli_query($db, $totalRecordsQuery);
    $totalRecordsRow = mysqli_fetch_assoc($totalRecordsResult);
    $totalRecords = $totalRecordsRow['total'];

    return $data;
}

$recordsPerPage = isset($_GET['recordsPerPage']) ? intval($_GET['recordsPerPage']) : 10;
$page = isset($_GET['page']) ? intval($_GET['page']) : 1;
$searchQuery = isset($_GET['search']) ? $_GET['search'] : '';

// Calculate the OFFSET for the current page
$offset = ($page - 1) * $recordsPerPage;

if (!empty($searchQuery)) {
    // Perform search and get data for the current page
    $data = searchStaff($searchQuery, $offset, $recordsPerPage, $totalRecords);
} else {
    // Fetch data from the 'staff' table for the current page
    $query = "SELECT * FROM staff ORDER BY id DESC LIMIT $recordsPerPage OFFSET $offset";
    $result = mysqli_query($db, $query);

    $data = array();
    while ($row = mysqli_fetch_assoc($result)) {
        $data[] = array(
            "id" => $row['id'],
            "name" => $row['name'],
            "contact" => $row['contact'],
            "level" => $row['level'],
        );
    }

    // Get the total number of records in the 'staff' table
    $totalRecordsQuery = "SELECT COUNT(*) AS total FROM staff";
    $totalRecordsResult = mysqli_query($db, $totalRecordsQuery);
    $totalRecordsRow = mysqli_fetch_assoc($totalRecordsResult);
    $totalRecords = $totalRecordsRow['total'];
}

// Calculate total pages
$totalPages = getTotalPages($totalRecords, $recordsPerPage);

// Return data as JSON
echo json_encode(array(
    "staff" => $data,
    "totalPages" => $totalPages
));
?>
