document.addEventListener('DOMContentLoaded', () => {
    // Basic interaction for toasts
    try {
        const toasts = document.querySelectorAll('.toast');
        toasts.forEach(toastEl => {
            if (window.bootstrap && bootstrap.Toast) {
                const toast = new bootstrap.Toast(toastEl, { delay: 5000 });
                toast.show();
            }
        });
    } catch (e) {
        console.error('Toast error:', e);
    }

    const html = document.documentElement;

    const updateIcons = (theme) => {
        // Update all theme toggle icons
        const icons = document.querySelectorAll('#theme-toggle i, #theme-toggle-mobile i');
        icons.forEach(icon => {
            if (theme === 'dark') {
                icon.className = 'fa-solid fa-sun';
            } else {
                icon.className = 'fa-solid fa-moon';
            }
        });

        // Update all theme status texts
        const textLabels = document.querySelectorAll('.theme-status-text');
        textLabels.forEach(label => {
            label.textContent = theme === 'dark' ? 'Dark Mode' : 'Light Mode';
        });
    };

    // Theme Toggle Logic
    const initThemeToggle = (btnId) => {
        const themeToggle = document.getElementById(btnId);
        if (!themeToggle) return;

        themeToggle.addEventListener('click', () => {
            const currentTheme = html.getAttribute('data-theme') || 'light';
            const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
            
            // Update UI
            html.setAttribute('data-theme', newTheme);
            
            // Update All Icons and Labels
            updateIcons(newTheme);
            
            // Save preference
            document.cookie = `theme=${newTheme}; path=/; max-age=${365 * 24 * 60 * 60}`;
            localStorage.setItem('theme', newTheme);
        });
    };

    // AJAX Category Filtering
    const initCategoryAjax = () => {
        const filters = document.querySelectorAll('.category-filter');
        const gridContainer = document.getElementById('apk-grid-container');
        const dropdownBtn = document.getElementById('category-dropdown-btn');
        const latestTitle = document.getElementById('latest-title');

        if (!gridContainer || filters.length === 0) return;

        filters.forEach(filter => {
            filter.addEventListener('click', (e) => {
                e.preventDefault();
                
                const category = filter.getAttribute('data-category');
                const url = filter.getAttribute('href');
                const categoryName = filter.textContent;

                // Update UI state
                gridContainer.style.opacity = '0.5';
                gridContainer.style.pointerEvents = 'none';

                // Fetch data
                fetch(url, {
                    headers: {
                        'X-Requested-With': 'XMLHttpRequest'
                    }
                })
                .then(response => response.text())
                .then(data => {
                    gridContainer.innerHTML = data;
                    gridContainer.style.opacity = '1';
                    gridContainer.style.pointerEvents = 'all';

                    // Update dropdown button text
                    if (dropdownBtn) {
                        dropdownBtn.innerHTML = `${categoryName} <i class="bi bi-chevron-down ms-1 small"></i>`;
                    }

                    // Update URL without refreshing
                    window.history.pushState({ category: category }, '', url);
                })
                .catch(err => {
                    console.error('Fetch error:', err);
                    gridContainer.style.opacity = '1';
                    gridContainer.style.pointerEvents = 'all';
                });
            });
        });

        // Handle browser back/forward
        window.addEventListener('popstate', (e) => {
            window.location.reload(); // Simple solution for now
        });
    };

    // AI Chat Assistant Logic
    const initAIChat = () => {
        const toggleBtn = document.getElementById('toggle-ai-chat');
        const closeBtn = document.getElementById('close-ai-chat');
        const chatWindow = document.getElementById('ai-chat-window');
        const chatInput = document.getElementById('ai-chat-input');
        const sendBtn = document.getElementById('send-ai-chat');
        const messagesContainer = document.getElementById('ai-chat-messages');

        if (!toggleBtn || !chatWindow) return;

        toggleBtn.addEventListener('click', () => {
            chatWindow.classList.toggle('d-none');
            if (!chatWindow.classList.contains('d-none')) {
                chatInput.focus();
            }
        });

        closeBtn.addEventListener('click', () => {
            chatWindow.classList.add('d-none');
        });

        const appendMessage = (message, isUser = false) => {
            const div = document.createElement('div');
            div.className = 'mb-3 d-flex ' + (isUser ? 'justify-content-end' : '');
            
            const content = document.createElement('div');
            content.className = (isUser ? 'bg-success text-white' : 'bg-white') + ' p-3 rounded-4 shadow-sm small';
            content.style.maxWidth = '85%';
            if (isUser) {
                content.style.borderBottomRightRadius = '0';
            } else {
                content.style.borderBottomLeftRadius = '0';
            }
            content.textContent = message;
            
            div.appendChild(content);
            messagesContainer.appendChild(div);
            messagesContainer.scrollTop = messagesContainer.scrollHeight;
        };

        const sendMessage = () => {
            const message = chatInput.value.trim();
            if (!message) return;

            appendMessage(message, true);
            chatInput.value = '';
            
            // Loading state
            const loadingDiv = document.createElement('div');
            loadingDiv.className = 'mb-3 d-flex';
            loadingDiv.innerHTML = '<div class="bg-white p-3 rounded-4 shadow-sm small" style="border-bottom-left-radius: 0 !important;"><div class="spinner-border spinner-border-sm text-success" role="status"></div> Thinking...</div>';
            messagesContainer.appendChild(loadingDiv);
            messagesContainer.scrollTop = messagesContainer.scrollHeight;

            fetch('/api/ai/chat', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify({ message: message })
            })
            .then(response => response.json())
            .then(data => {
                messagesContainer.removeChild(loadingDiv);
                if (data.reply) {
                    appendMessage(data.reply);
                } else {
                    appendMessage(data.error || 'Sorry, something went wrong.');
                }
            })
            .catch(err => {
                messagesContainer.removeChild(loadingDiv);
                appendMessage('Error connecting to AI assistant.');
                console.error(err);
            });
        };

        sendBtn.addEventListener('click', sendMessage);
        chatInput.addEventListener('keypress', (e) => {
            if (e.key === 'Enter') sendMessage();
        });
    };

    // Initial Sync
    const currentTheme = html.getAttribute('data-theme') || 'light';
    updateIcons(currentTheme);

    // Sync theme from localStorage if cookie is missing but localStorage has it
    const savedTheme = localStorage.getItem('theme');
    const currentCookie = document.cookie.split('; ').find(row => row.startsWith('theme='))?.split('=')[1];
    
    if (savedTheme && !currentCookie) {
        html.setAttribute('data-theme', savedTheme);
        updateIcons(savedTheme);
        document.cookie = `theme=${savedTheme}; path=/; max-age=${365 * 24 * 60 * 60}`;
    }

    initThemeToggle('theme-toggle');
    initThemeToggle('theme-toggle-mobile');
    initCategoryAjax();
    initAIChat();

    console.log('ApkNusa ready.');
});