const style = document.createElement('style');
style.textContent = `
@keyframes slideLeft {0% { transform: translateX(0); } 50% { transform: translateX(-5px); } 100% { transform: translateX(0); }}
@keyframes slideRight {0% { transform: translateX(0); } 50% { transform: translateX(5px); } 100% { transform: translateX(0); }}
.button-animate-back { animation: slideLeft 0.3s ease-in-out; }
.button-animate-forward { animation: slideRight 0.3s ease-in-out; }
`;
document.head.appendChild(style);

const historyStack = [];
let currentIndex = -1;
const elements = {
    refreshIcon: document.getElementById('refreshIcon'),
    fullscreenIcon: document.getElementById('fullscreenIcon'),
    backIcon: document.getElementById('backIcon'),
    forwardIcon: document.getElementById('forwardIcon'),
    searchInput2: document.getElementById('searchInputt'),
    iframe: document.getElementById('cool-iframe')
};
let loadingFallbackTimeout;

elements.refreshIcon.addEventListener('click', handleRefresh);
elements.fullscreenIcon.addEventListener('click', handleFullscreen);
elements.backIcon.addEventListener('click', handleBack);
elements.forwardIcon.addEventListener('click', handleForward);

function showLoadingScreen() {
    if (typeof NProgress !== 'undefined') NProgress.start();
}

function hideLoadingScreen() {
    if (typeof NProgress !== 'undefined') NProgress.done();
}

function handleRefresh() {
    elements.refreshIcon.classList.add('spin');
    const iframe = elements.iframe;
    const currentUrl = iframe.contentWindow.location.href;
    if (normalizeUrl(currentUrl) !== normalizeUrl(historyStack[currentIndex] || '')) {
        addToHistory(currentUrl);
    }
    iframe.contentWindow.location.reload(true);
    setTimeout(() => elements.refreshIcon.classList.remove('spin'), 300);
}

function handleFullscreen() {
    const iframe = elements.iframe;
    if (iframe && iframe.tagName === 'IFRAME') iframe.requestFullscreen();
}

function handleBack() {
    toggleButtonAnimation(elements.backIcon, 'button-animate-back');
    if (currentIndex > 0) {
        currentIndex--;
        updateIframeSrc();
    }
}

function handleForward() {
    toggleButtonAnimation(elements.forwardIcon, 'button-animate-forward');
    if (currentIndex < historyStack.length - 1) {
        currentIndex++;
        updateIframeSrc();
    }
}

function toggleButtonAnimation(button, animationClass) {
    button.classList.add(animationClass);
    setTimeout(() => button.classList.remove(animationClass), 200);
}

function normalizeUrl(urlStr) {
    try {
        const url = new URL(urlStr);
        url.searchParams.delete('ia');
        return url.toString();
    } catch (e) {
        return urlStr;
    }
}

function addToHistory(url) {
    const normalized = normalizeUrl(url);
    if (currentIndex >= 0 && normalizeUrl(historyStack[currentIndex]) === normalized) return;
    if (currentIndex < historyStack.length - 1) historyStack.splice(currentIndex + 1);
    historyStack.push(url);
    currentIndex++;
    updateNavButtons();
    updateDecodedSearchInput();
}

function updateIframeSrc() {
    showLoadingScreen();
    elements.iframe.src = historyStack[currentIndex];
    updateNavButtons();
    updateDecodedSearchInput();
}

function updateNavButtons() {
    const isAtStart = currentIndex <= 0;
    const isAtEnd = currentIndex >= historyStack.length - 1;
    elements.backIcon.disabled = isAtStart;
    elements.forwardIcon.disabled = isAtEnd;
    elements.backIcon.classList.toggle('disabled', isAtStart);
    elements.forwardIcon.classList.toggle('disabled', isAtEnd);
}

function updateDecodedSearchInput() {
    if (elements.searchInput2) {
        const url = historyStack[currentIndex] || elements.iframe.src;
        elements.searchInput2.value = decodeUrl(url);
    }
}

function decodeUrl(url) {
    try {
        return decodeURIComponent(url);
    } catch (e) {
        return url;
    }
}

window.addToHistory = addToHistory;
window.updateDecodedSearchInput = updateDecodedSearchInput;
window.normalizeUrl = normalizeUrl;

function detectIframeNavigation() {
    try {
        const iframeWindow = elements.iframe.contentWindow;
        const pushState = iframeWindow.history.pushState;
        const replaceState = iframeWindow.history.replaceState;
        iframeWindow.history.pushState = function() {
            pushState.apply(this, arguments);
            handleIframeNavigation(iframeWindow.location.href);
        };
        iframeWindow.history.replaceState = function() {
            replaceState.apply(this, arguments);
            handleIframeNavigation(iframeWindow.location.href);
        };
        iframeWindow.addEventListener('popstate', () => handleIframeNavigation(iframeWindow.location.href));
        iframeWindow.addEventListener('hashchange', () => handleIframeNavigation(iframeWindow.location.href));
    } catch (error) {}
}

function handleIframeNavigation(url) {
    if (url && normalizeUrl(url) !== normalizeUrl(historyStack[currentIndex] || '')) {
        showLoadingScreen();
        addToHistory(url);
    } else {
        hideLoadingScreen();
    }
}

elements.iframe.addEventListener('load', () => {
    try {
        detectIframeNavigation();
        if (historyStack.length === 0) {
            addToHistory(elements.iframe.contentWindow.location.href);
        } else {
            handleIframeNavigation(elements.iframe.contentWindow.location.href);
        }
    } catch (error) {
        console.error('Error during iframe load handling:', error); 
    } finally {
        hideLoadingScreen();
    }
});