/* chat.js */
document.addEventListener('DOMContentLoaded', () => {
    const CHAT_WIDGET_HTML = `
    <div id="chat-widget" class="collapsed">
      <div id="chat-header">
        <span><span id="chat-status-dot" class="status-offline">●</span> MESSAGE BOARD</span>
        <button id="chat-toggle" aria-label="Toggle message board">▲</button>
      </div>
      <div id="chat-body" style="display: none;">
        <div id="chat-messages"></div>
        <div id="chat-input-area">
          <div class="chat-settings">
            <label for="chat-nick-input" style="font-size:0.8rem; color:#ccc;">Name:</label>
            <input type="text" id="chat-nick-input" placeholder="visitor" maxlength="20">
          </div>
          <div id="chat-controls">
            <input type="text" id="chat-input" placeholder="Post a message..." maxlength="200">
            <button id="chat-send">Post</button>
          </div>
          <div id="chat-status">Connecting…</div>
        </div>
      </div>
    </div>
  `;

    document.body.insertAdjacentHTML('beforeend', CHAT_WIDGET_HTML);

    const widget = document.getElementById('chat-widget');
    const header = document.getElementById('chat-header');
    const toggleBtn = document.getElementById('chat-toggle');
    const body = document.getElementById('chat-body');
    const messagesContainer = document.getElementById('chat-messages');
    const input = document.getElementById('chat-input');
    const sendBtn = document.getElementById('chat-send');
    const nickInput = document.getElementById('chat-nick-input');
    const statusEl = document.getElementById('chat-status');
    const statusDot = document.getElementById('chat-status-dot');

    let ws = null;
    let isCollapsed = true;

    // Initialize nickname base (server appends IP suffix)
    let savedNick = localStorage.getItem('gw_chat_nick');
    if (!savedNick) {
        savedNick = 'visitor';
        localStorage.setItem('gw_chat_nick', savedNick);
    }
    nickInput.value = savedNick;

    nickInput.addEventListener('change', () => {
        let val = nickInput.value.trim();
        if (!val) val = 'visitor';
        nickInput.value = val;
        localStorage.setItem('gw_chat_nick', val);
    });

    // Toggle chat
    function toggleChat() {
        isCollapsed = !isCollapsed;
        if (isCollapsed) {
            widget.classList.add('collapsed');
            body.style.display = 'none';
            toggleBtn.textContent = '▲';
        } else {
            widget.classList.remove('collapsed');
            body.style.display = 'flex';
            toggleBtn.textContent = '▼';
            input.focus();
            scrollToBottom();
        }
    }

    header.addEventListener('click', (e) => {
        if (e.target !== nickInput && e.target !== input) {
            toggleChat();
        }
    });

    function formatTime(ts) {
        const d = new Date(ts);
        return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit', hour12: false });
    }

    function appendMessage(msg) {
        const div = document.createElement('div');
        div.className = 'chat-message';

        const tsSpan = document.createElement('span');
        tsSpan.className = 'chat-ts';
        tsSpan.textContent = '[' + formatTime(msg.ts) + ']';

        const nickSpan = document.createElement('span');
        nickSpan.className = 'chat-nick';
        nickSpan.textContent = msg.nick + ':';

        const textSpan = document.createElement('span');
        textSpan.className = 'chat-text';
        textSpan.textContent = msg.text;

        div.appendChild(tsSpan);
        div.appendChild(nickSpan);
        div.appendChild(textSpan);

        messagesContainer.appendChild(div);
        scrollToBottom();
    }

    function scrollToBottom() {
        messagesContainer.scrollTop = messagesContainer.scrollHeight;
    }

    function connect() {
        const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
        const host = window.location.host; // includes port if non-standard
        ws = new WebSocket(`${protocol}//${host}/chat`);

        ws.onopen = () => {
            statusEl.textContent = 'Connected';
            statusDot.className = 'status-online';
        };

        ws.onmessage = (e) => {
            try {
                const data = JSON.parse(e.data);
                if (data.type === 'history') {
                    messagesContainer.innerHTML = '';
                    data.messages.forEach(appendMessage);
                } else {
                    appendMessage(data);
                }
            } catch (err) {
                console.error('Chat MS error:', err);
            }
        };

        ws.onclose = () => {
            statusEl.textContent = 'Disconnected. Reconnecting...';
            statusDot.className = 'status-offline';
            setTimeout(connect, 3000);
        };

        ws.onerror = () => {
            statusEl.textContent = 'Connection Error';
            ws.close();
        };
    }

    function sendMessage() {
        const text = input.value.trim();
        if (!text || ws.readyState !== WebSocket.OPEN) return;

        const nick = nickInput.value.trim() || 'visitor';
        const msg = { nick, text };

        ws.send(JSON.stringify(msg));
        input.value = '';
        input.focus();
    }

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

    // Init connection
    connect();
});