// Tab management
class TabManager {
    constructor() {
        this.tabs = [];
        this.activeTabId = null;
        this.tabCounter = 0;
        this.init();
    }

    init() {
        this.tabBar = document.getElementById('tab-bar');
        this.browserContainer = document.getElementById('browser-container');
        this.newTabBtn = document.getElementById('new-tab-btn');
        this.newTabBtn.addEventListener('click', () => this.addTab());
        
        // Add initial tab
        this.addTab();
    }

    addTab(url = '') {
        const tabId = ++this.tabCounter;
        const tab = {
            id: tabId,
            url: url || '',
            title: 'New Tab',
            favicon: '',
            iframe: document.createElement('iframe')
        };

        tab.iframe.className = 'w-full h-full rounded-lg hidden';
        tab.iframe.sandbox = 'allow-same-origin allow-scripts allow-popups allow-forms';
        this.browserContainer.appendChild(tab.iframe);

        const tabElement = document.createElement('button');
        tabElement.className = 'px-4 py-1 rounded-t-lg tab-inactive flex items-center space-x-2 smooth-transition';
        tabElement.dataset.tabId = tabId;

        const favicon = document.createElement('img');
        favicon.className = 'w-4 h-4';
        favicon.src = 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCI+PHBhdGggZD0iTTEyIDJDNi40ODcgMiAyIDYuNDg3IDIgMTJzNC40ODcgMTAgMTAgMTAgMTAtNC40ODcgMTAtMTBTMTcuNTEzIDIgMTIgMnptMCAxOGMtNC40MSAwLTgtMy41OS04LThzMy41OS04IDgtOCA4IDMuNTkgOCA4LTMuNTkgOC04IDh6IiBmaWxsPSJ3aGl0ZSIvPjwvc3ZnPg==';
        favicon.alt = '';

        const title = document.createElement('span');
        title.className = 'truncate max-w-xs';
        title.textContent = 'New Tab';

        const closeBtn = document.createElement('button');
        closeBtn.className = 'ml-2 hover:text-red-400';
        closeBtn.innerHTML = '<i data-feather="x" class="w-3 h-3"></i>';
        closeBtn.addEventListener('click', (e) => {
            e.stopPropagation();
            this.closeTab(tabId);
        });

        tabElement.appendChild(favicon);
        tabElement.appendChild(title);
        tabElement.appendChild(closeBtn);

        tabElement.addEventListener('click', () => this.switchTab(tabId));

        this.tabBar.insertBefore(tabElement, this.newTabBtn);
        this.tabs.push({
            ...tab,
            element: tabElement,
            faviconElement: favicon,
            titleElement: title
        });

        this.switchTab(tabId);
        feather.replace();
    }

    switchTab(tabId) {
        this.tabs.forEach(tab => {
            const isActive = tab.id === tabId;
            tab.element.classList.toggle('tab-active', isActive);
            tab.element.classList.toggle('tab-inactive', !isActive);
            tab.iframe.classList.toggle('hidden', !isActive);
        });

        this.activeTabId = tabId;
        const activeTab = this.getActiveTab();
        
        // Focus the iframe
        if (activeTab.iframe.contentWindow) {
            activeTab.iframe.contentWindow.focus();
        }
    }

    closeTab(tabId) {
        if (this.tabs.length <= 1) {
            return; // Don't close the last tab
        }

        const tabIndex = this.tabs.findIndex(tab => tab.id === tabId);
        if (tabIndex === -1) return;

        const tab = this.tabs[tabIndex];
        this.browserContainer.removeChild(tab.iframe);
        this.tabBar.removeChild(tab.element);
        this.tabs.splice(tabIndex, 1);

        if (this.activeTabId === tabId) {
            this.switchTab(this.tabs[Math.max(0, tabIndex - 1)].id);
        }
    }

    getActiveTab() {
        return this.tabs.find(tab => tab.id === this.activeTabId);
    }

    navigateActiveTab(url) {
        const tab = this.getActiveTab();
        if (!tab) return;

        try {
            // Simple proxy handling - in a real proxy, you'd need server-side handling
            tab.iframe.src = url;
            tab.url = url;
            tab.titleElement.textContent = 'Loading...';
        } catch (error) {
            console.error('Navigation error:', error);
        }
    }
}

// Initialize the proxy when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    const tabManager = new TabManager();
    window.tabManager = tabManager; // Make it accessible for debugging

    // Example of how you might handle URL navigation
    // In a real implementation, you'd have a proper proxy backend
    document.getElementById('navigate-btn')?.addEventListener('click', () => {
        const urlInput = document.getElementById('url-input');
        if (urlInput && urlInput.value) {
            tabManager.navigateActiveTab(urlInput.value);
        }
    });
});