// MusicRoom - Utilities module
// DOM helpers, formatting, toast notifications

(function() {
  const M = window.MusicRoom;
  
  // DOM selector helper
  M.$ = (s) => document.querySelector(s);

  // Shared HTML escaping helper - use for any server-controlled string
  // interpolated into innerHTML (text and attribute contexts)
  M.escapeHtml = function(str) {
    if (str == null) return "";
    return String(str)
      .replace(/&/g, "&")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;")
      .replace(/"/g, "&quot;")
      .replace(/'/g, "&#39;");
  };
  
  // Format seconds as m:ss
  M.fmt = function(sec) {
    if (!sec || !isFinite(sec)) return "0:00";
    const m = Math.floor(sec / 60);
    const s = Math.floor(sec % 60);
    return m + ":" + String(s).padStart(2, "0");
  };
  
  // Toast history
  M.toastHistory = [];

  function pruneVisibleToasts(container) {
    const limit = window.matchMedia("(max-width: 768px)").matches ? 2 : 3;
    const toasts = [...container.querySelectorAll(".toast:not(.toast-confirm)")];
    while (toasts.length > limit) {
      toasts.shift().remove();
    }
  }
  
  // Toast notifications (log style - multiple visible)
  M.showToast = function(message, type = "info", duration = 5000) {
    const container = M.$("#toast-container");
    const toast = document.createElement("div");
    toast.className = "toast toast-" + type;
    toast.textContent = message;
    container.appendChild(toast);
    pruneVisibleToasts(container);
    setTimeout(() => {
      toast.classList.add("fade-out");
      setTimeout(() => toast.remove(), 300);
    }, duration);
    
    // Add to history
    M.toastHistory.push({
      message,
      type,
      time: new Date()
    });
    M.updateToastHistory();
  };

  M.showConfirmToast = function(message, onConfirm, options = {}) {
    const container = M.$("#toast-container");
    const toast = document.createElement("div");
    toast.className = "toast toast-warning toast-confirm";

    const text = document.createElement("span");
    text.className = "toast-confirm-message";
    text.textContent = message;

    const actions = document.createElement("div");
    actions.className = "toast-actions";

    const cancel = document.createElement("button");
    cancel.type = "button";
    cancel.className = "toast-action-cancel";
    cancel.textContent = options.cancelText || "Cancel";

    const confirm = document.createElement("button");
    confirm.type = "button";
    confirm.className = "toast-action-confirm";
    confirm.textContent = options.confirmText || "Confirm";

    actions.append(cancel, confirm);
    toast.append(text, actions);
    container.appendChild(toast);

    let settled = false;
    const close = () => {
      toast.classList.add("fade-out");
      setTimeout(() => toast.remove(), 300);
    };
    const finish = async (confirmed) => {
      if (settled) return;
      settled = true;
      close();
      if (confirmed) await onConfirm();
    };

    cancel.onclick = () => finish(false);
    confirm.onclick = () => finish(true);
    setTimeout(() => finish(false), options.duration || 12000);

    M.toastHistory.push({
      message: `Confirm: ${message}`,
      type: "warning",
      time: new Date()
    });
    M.updateToastHistory();
  };
  
  // Update toast history panel
  M.updateToastHistory = function() {
    const list = M.$("#toast-history-list");
    if (!list) return;
    
    list.innerHTML = "";
    // Show newest first
    const items = [...M.toastHistory].reverse().slice(0, 50);
    for (const item of items) {
      const div = document.createElement("div");
      div.className = "history-item history-" + item.type;
      const time = item.time.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit' });
      div.innerHTML = `<span class="history-time">${time}</span> ${M.escapeHtml(item.message)}`;
      list.appendChild(div);
    }
  };
  
  // Toggle toast history panel
  M.toggleToastHistory = function() {
    const panel = M.$("#toast-history");
    if (panel) {
      panel.classList.toggle("hidden");
      if (!panel.classList.contains("hidden")) {
        M.updateToastHistory();
      }
    }
  };
  
  // Flash permission denied animation
  M.flashPermissionDenied = function() {
    const row = M.$("#progress-row");
    row.classList.remove("denied");
    void row.offsetWidth; // Trigger reflow to restart animation
    row.classList.add("denied");
    setTimeout(() => row.classList.remove("denied"), 500);
  };
  
  // Set track title (UI and document title)
  M.setTrackTitle = function(title) {
    M.currentTitle = title;
    const containerEl = M.$("#track-name");
    const marqueeEl = containerEl?.querySelector(".marquee-inner");
    
    if (!containerEl || !marqueeEl) return;
    
    document.title = title ? `${title} - MusicRoom` : "MusicRoom";
    
    // First set simple content to measure
    marqueeEl.innerHTML = `<span id="track-title">${M.escapeHtml(title)}</span>`;
    
    // Check if title overflows and needs scrolling
    requestAnimationFrame(() => {
      const titleEl = M.$("#track-title");
      const needsScroll = titleEl && titleEl.scrollWidth > containerEl.clientWidth;
      containerEl.classList.toggle("scrolling", needsScroll);
      
      // Duplicate text for seamless wrap-around scrolling
      if (needsScroll) {
        marqueeEl.innerHTML = `<span id="track-title">${M.escapeHtml(title)}</span><span class="marquee-spacer">&nbsp;&nbsp;&nbsp;•&nbsp;&nbsp;&nbsp;</span><span>${M.escapeHtml(title)}</span><span class="marquee-spacer">&nbsp;&nbsp;&nbsp;•&nbsp;&nbsp;&nbsp;</span>`;
      }
    });
  };
  
  // Get current server time (extrapolated)
  M.getServerTime = function() {
    if (M.serverPaused) return M.serverTimestamp;
    return M.serverTimestamp + (Date.now() - M.lastServerUpdate) / 1000;
  };
  
  // Check if current user can control playback
  M.canControl = function() {
    if (!M.currentUser) return false;
    if (M.currentUser.isAdmin) return true;
    if (M.currentUser.isGuest) return false;
    return M.currentUser.permissions?.some(p => 
      p.resource_type === "channel" && 
      (p.resource_id === M.currentChannelId || p.resource_id === null) && 
      p.permission === "control"
    );
  };

  M.canCreateUserContent = function() {
    return !!M.currentUser && !M.currentUser.isGuest;
  };

  M.updatePermissionUI = function() {
    const canCreate = M.canCreateUserContent();
    const newChannel = M.$("#btn-new-channel");
    const newPlaylist = M.$("#btn-new-playlist");
    const fetchUrl = M.$("#btn-fetch-url");

    if (newChannel) newChannel.classList.toggle("hidden", !canCreate);
    if (newPlaylist) newPlaylist.classList.toggle("hidden", !canCreate);
    if (fetchUrl) {
      const ytdlpReady = M.serverStatus?.ytdlp?.enabled && M.serverStatus?.ytdlp?.available;
      fetchUrl.style.display = canCreate && ytdlpReady ? "" : "none";
    }
  };
})();