let refreshIntervalId;
let currentInterval = 15000; // Default, will be updated by background script
let userScrolledDown = false;
let scrollThreshold = window.innerHeight * 0.05; // Threshold as 5% of the viewport height

window.addEventListener('scroll', () => {
    if (window.scrollY > scrollThreshold) {
        userScrolledDown = true;
    } else {
        userScrolledDown = false;
    }
});

function simulateHomeButtonClick() {
    // Check if we are on the main Bluesky feed page
    if (window.location.href === 'https://bsky.app/') {
        // Find any element with aria-label="Home"
        // This is more robust than looking for a specific tag like 'a'
        const homeButton = document.querySelector('[aria-label="Home"]');

        // Only click the "Home" button (to refresh) if the user has not scrolled down
        if (!userScrolledDown) {
            if (homeButton) {
                // Check if the element is visible and clickable
                const rect = homeButton.getBoundingClientRect();
                const isVisible = rect.top >= 0 && rect.left >= 0 && rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) && rect.right <= (window.innerWidth || document.documentElement.clientWidth) && rect.width > 0 && rect.height > 0;

                if (isVisible && typeof homeButton.click === 'function') {
                    homeButton.click();
                    console.log("Bluesky Auto Refresh: Simulated click on the 'Home' button (at top of timeline).");
                    userScrolledDown = false; // Reset scroll status after refresh
                } else if (!isVisible) {
                     console.log("Bluesky Auto Refresh: 'Home' button found but not visible/clickable.");
                } else {
                     console.log("Bluesky Auto Refresh: Found element with aria-label='Home', but it cannot be clicked.");
                }
            } else {
                console.log("Bluesky Auto Refresh: 'Home' button with aria-label='Home' not found.");
            }
        } else {
            console.log("Bluesky Auto Refresh: User has scrolled down, skipping refresh.");
        }
    }
}

function startInterval(interval) {
    clearInterval(refreshIntervalId);
    currentInterval = interval;
    refreshIntervalId = setInterval(simulateHomeButtonClick, currentInterval);
    console.log("Bluesky Auto Refresh: Interval set to " + currentInterval + "ms");
}

// Run once on page load with the default interval
startInterval(currentInterval);

// Listen for messages from the background script to update the interval
browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
    if (request.action === 'setInterval') {
        startInterval(request.interval);
    }
});

console.log("Bluesky Auto Refresh extension is running (interval controlled by background, refresh paused when scrolled down).");