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let lastSortedColumn = null;
let lastSortAscending = false;  // Start with false so the first click sorts ascending
let currentPage = 1;            // Define currentPage at the top level
const rowsPerPage = 50;         // Define the number of rows per page
let totalRows = 0;              // This will hold the total number of rows fetched

function fetchData() {
    fetch('data.php')
        .then(response => response.json())
        .then(data => {
            totalRows = data.length; // Update total number of rows
            displayData(data);       // Call to function that handles data display
            updatePageInfo();        // Update pagination info
        })
        .catch(error => {
            console.error('Error:', error);
        });
}

function displayData(data) {
    const tableBody = document.getElementById('dataDisplay').getElementsByTagName('tbody')[0];
    tableBody.innerHTML = ''; // Clear previous rows

    // Calculate which items to display based on current page
    const start = (currentPage - 1) * rowsPerPage;
    const end = start + rowsPerPage;
    const paginatedItems = data.slice(start, end);

    paginatedItems.forEach(item => {
        const row = document.createElement('tr');
        row.innerHTML = `<td>${item.id}</td>
                         <td>${item.temp}</td>
                         <td>${item.humi}</td>
                         <td>${item.press}</td>
                         <td>${item.CO}</td>
                         <td>${item.dist}</td>
                         <td>${item.butt}</td>
                         <td>${item.posi}</td>`;
        tableBody.appendChild(row);
    });

    // Reapply sorting if there was a previous sort
    if (lastSortedColumn !== null) {
        sortByColumn(lastSortedColumn, lastSortAscending);
    }
}

function sortByColumn(columnIndex, ascending) {
    // Toggle the sort direction if the same column is clicked again
    if (lastSortedColumn === columnIndex) {
        ascending = !lastSortAscending;
    }

    lastSortedColumn = columnIndex;
    lastSortAscending = ascending;

    const table = document.getElementById('dataDisplay');
    const rows = Array.from(table.querySelectorAll('tbody tr'));
    rows.sort((a, b) => {
        const aVal = a.children[columnIndex].textContent || a.children[columnIndex].innerText;
        const bVal = b.children[columnIndex].textContent || b.children[columnIndex].innerText;
        if (!isNaN(parseFloat(aVal)) && !isNaN(parseFloat(bVal))) {
            return ascending ? aVal - bVal : bVal - aVal;
        }
        return ascending ? aVal.localeCompare(bVal) : bVal.localeCompare(aVal);
    });

    rows.forEach(row => table.querySelector('tbody').appendChild(row));
}

function nextPage() {
    const totalPages = Math.ceil(totalRows / rowsPerPage);
    if (currentPage < totalPages) {
        currentPage++;
        fetchData();
    }
}

function previousPage() {
    if (currentPage > 1) {
        currentPage--;
        fetchData();
    }
}

function updatePageInfo() {
    const pageInfo = document.getElementById('pageInfo');
    pageInfo.textContent = `Page ${currentPage} of ${Math.ceil(totalRows / rowsPerPage)}`;
}

// Fetch data every 5 seconds to update the page in real time
setInterval(fetchData, 5000);

// Initial fetch
fetchData();
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