const toggleBtn = document.getElementById("chatbot-toggle-btn");
const closeBtn = document.getElementById("chatbot-close-btn");
const chatWindow = document.getElementById("chatbot-window");
const chatForm = document.getElementById("chatbot-input-form");
const inputField = document.getElementById("chatbot-input-field");
const messagesContainer = document.getElementById("chatbot-messages");
const pulseDot = document.querySelector(".pulse-notification-dot");

// Initialize the new JavaScript intent matching engine using injected PHP data
// We add a safety check in case chatbot-engine.js failed to load
if (typeof window.PortfolioChatEngine === 'undefined') {
    console.error("Chat engine not loaded");
} else {
    const engine = new window.PortfolioChatEngine(window.portfolioData || {});
    let isWaiting = false;

    // Toggle Chat Window
    if (toggleBtn) {
        toggleBtn.addEventListener("click", () => {
            chatWindow.classList.toggle("hidden");
            chatWindow.classList.toggle("active");
            if (chatWindow.classList.contains("active")) {
                inputField.focus();
                if (pulseDot) pulseDot.style.display = "none";
            }
        });
    }

    if (closeBtn) {
        closeBtn.addEventListener("click", () => {
            chatWindow.classList.add("hidden");
            chatWindow.classList.remove("active");
        });
    }

    // Handle form submit
    if (chatForm) {
        chatForm.addEventListener("submit", async (e) => {
            e.preventDefault();
            if (isWaiting) return;

            const message = inputField.value.trim();
            if (!message) return;

            // Add user message to UI
            addMessage(message, "user-msg");
            inputField.value = "";
            
            isWaiting = true;

            // Show typing indicator
            const typingId = showTypingIndicator();

            // Simulate network delay for natural feel (600ms - 1200ms)
            const delay = Math.floor(Math.random() * 600) + 600;
            
            setTimeout(() => {
                // Remove typing indicator
                removeTypingIndicator(typingId);
                
                // Get response from our JS engine instead of API
                const responseText = engine.match(message);
                
                // Display formatted markdown response
                addMessage(responseText, "bot-msg", true);
                isWaiting = false;
                
            }, delay);
        });
    }

    // -------------------------------------------------------------
    // UI Helpers
    // -------------------------------------------------------------
    function addMessage(text, typeClass, isMarkdown = false) {
        const msgDiv = document.createElement("div");
        msgDiv.className = `chat-message ${typeClass}`;
        
        const bubble = document.createElement("div");
        bubble.className = "msg-bubble";

        if (isMarkdown && typeClass !== "user-msg") {
            bubble.innerHTML = parseSimpleMarkdown(text);
        } else {
            bubble.textContent = text;
        }

        msgDiv.appendChild(bubble);
        messagesContainer.appendChild(msgDiv);
        scrollToBottom();
    }

    function showTypingIndicator() {
        const msgDiv = document.createElement("div");
        msgDiv.className = "chat-message bot-msg typing-msg";
        const id = "typing-" + Date.now();
        msgDiv.id = id;

        const bubble = document.createElement("div");
        bubble.className = "msg-bubble typing-bubble";
        
        bubble.innerHTML = `
            <span class="dot-bounce"></span>
            <span class="dot-bounce"></span>
            <span class="dot-bounce"></span>
        `;

        msgDiv.appendChild(bubble);
        messagesContainer.appendChild(msgDiv);
        scrollToBottom();
        return id;
    }

    function removeTypingIndicator(id) {
        const el = document.getElementById(id);
        if (el) el.remove();
    }

    function scrollToBottom() {
        messagesContainer.scrollTo({
            top: messagesContainer.scrollHeight,
            behavior: "smooth"
        });
    }

    function parseSimpleMarkdown(text) {
        // Bold: **text**
        text = text.replace(/\*\*(.*?)\*\*/g, '<strong>$1</strong>');
        // Italic: *text*
        text = text.replace(/\*(.*?)\*/g, '<em>$1</em>');
        
        // Links: [text](url)
        text = text.replace(/\[(.*?)\]\((.*?)\)/g, '<a href="$2" target="_blank" style="color: var(--accent-2); text-decoration: underline;">$1</a>');
        
        // Bullet points: - text or * text
        // If there are multiple bullets, wrap in <ul>
        if (text.match(/^[-*]\s/m)) {
            const lines = text.split('\n');
            let inList = false;
            let result = [];
            
            for (let i = 0; i < lines.length; i++) {
                let line = lines[i];
                if (line.match(/^[-*]\s(.*)/)) {
                    if (!inList) { result.push('<ul>'); inList = true; }
                    result.push(`<li>${line.replace(/^[-*]\s(.*)/, '$1')}</li>`);
                } else {
                    if (inList) { result.push('</ul>'); inList = false; }
                    if (line.trim() !== '') {
                        result.push(line + '<br>');
                    }
                }
            }
            if (inList) result.push('</ul>');
            text = result.join('\n');
        } else {
            // Normal newlines
            text = text.replace(/\n/g, '<br>');
        }
        
        return text;
    }
}