(function () {
  "use strict";

  var root = document.getElementById("coRoot");
  var panel = document.getElementById("coPanel");
  var joinOverlay = document.getElementById("coJoinOverlay");
  var joinMessage = document.getElementById("coJoinMessage");

  var FOCUS_ZONES = ["tabs", "filters", "server-list"];
  var REPEAT_INITIAL_MS = 400;
  var REPEAT_RATE_MS = 80;

  var repeatTimer = null;
  var repeatAction = null;

  var state = {
    activeTab: "server-browser",
    focusZone: "server-list",
    selectedTabIndex: 1,
    selectedServerIndex: 0,
    selectedFilterIndex: 0,
    filters: {
      search: "",
      region: "Any Region",
      mode: "Any Mode",
      worldspace: "Any Worldspace",
      ping: "Any",
      showFull: false,
      hasPassword: false,
      modded: false
    },
    allServers: [],
    servers: [],
    favorites: [],
    recent: [],
    connectionStatus: "Online",
    isRefreshing: false,
    directConnect: { address: "127.0.0.1", port: "7777" },
    joinOverlay: null
  };

  function sendAction(action, payload) {
    var msg = JSON.stringify(Object.assign({ action: action }, payload || {}));
    if (typeof window.coAction === "function") {
      window.coAction(msg);
      return;
    }
    console.warn("[CO] coAction bridge unavailable:", action);
    handleActionLocal(action, payload || {});
  }

  function handleActionLocal(action, payload) {
    switch (action) {
      case "refreshServerList":
        refreshLocalMock();
        break;
      case "setFilter":
        state.filters[payload.filterName] = payload.value;
        applyLocalFilters();
        render();
        break;
      case "resetFilters":
        resetLocalFilters();
        break;
      case "toggleFavorite":
        toggleFavoriteLocal(payload.serverId);
        break;
      case "joinServer":
        joinServerLocal(payload.serverId);
        break;
      case "openDirectConnect":
        joinDirectLocal(payload.address, payload.port);
        break;
      case "switchTab":
        switchTab(payload.tabName);
        break;
      case "closeBrowser":
        if (typeof window.closeBrowser === "function") window.closeBrowser();
        break;
      default:
        break;
    }
  }

  function refreshLocalMock() {
    state.isRefreshing = true;
    render();
    setTimeout(function () {
      state.allServers = (window.CO_MOCK_SERVERS || []).slice();
      applyLocalFilters();
      state.isRefreshing = false;
      render();
    }, 600);
  }

  function resetLocalFilters() {
    state.filters = {
      search: "",
      region: "Any Region",
      mode: "Any Mode",
      worldspace: "Any Worldspace",
      ping: "Any",
      showFull: false,
      hasPassword: false,
      modded: false
    };
    sendAction("resetFilters", {});
    applyLocalFilters();
    render();
  }

  function applyLocalFilters() {
    var list = state.allServers.slice();
    var f = state.filters;

    if (f.search) {
      var q = f.search.toLowerCase();
      list = list.filter(function (s) {
        return s.name.toLowerCase().indexOf(q) >= 0;
      });
    }
    if (f.region !== "Any Region") {
      list = list.filter(function (s) { return s.region === f.region; });
    }
    if (f.mode !== "Any Mode") {
      list = list.filter(function (s) { return s.mode === f.mode; });
    }
    if (f.worldspace !== "Any Worldspace") {
      list = list.filter(function (s) { return s.worldspace === f.worldspace; });
    }
    if (f.ping === "< 50 ms") list = list.filter(function (s) { return s.ping < 50; });
    else if (f.ping === "< 100 ms") list = list.filter(function (s) { return s.ping < 100; });
    else if (f.ping === "< 150 ms") list = list.filter(function (s) { return s.ping < 150; });
    if (!f.showFull) list = list.filter(function (s) { return s.status !== "Full"; });
    if (f.hasPassword) list = list.filter(function (s) { return s.passworded; });
    if (f.modded) list = list.filter(function (s) { return s.modded; });

    state.servers = list;
    state.favorites = state.allServers.filter(function (s) { return s.favorite; });
    if (state.selectedServerIndex >= state.servers.length) {
      state.selectedServerIndex = Math.max(0, state.servers.length - 1);
    }
    updateServerCount();
  }

  function updateServerCount() {
    var countEl = document.getElementById("coServerCount");
    var titleEl = document.getElementById("coSubpanelTitle");
    var count = state.servers.length;
    if (countEl) {
      countEl.textContent = count + " Found";
    }
    if (titleEl && state.activeTab === "server-browser") {
      titleEl.textContent = count === 1 ? "1 Server" : count + " Servers";
    }
  }

  function toggleFavoriteLocal(serverId) {
    var server = findServerById(serverId);
    if (!server) return;
    server.favorite = !server.favorite;
    sendAction("toggleFavorite", { serverId: serverId });
    applyLocalFilters();
    render();
  }

  function findServerById(id) {
    for (var i = 0; i < state.allServers.length; i++) {
      if (state.allServers[i].id === id) return state.allServers[i];
    }
    return null;
  }

  function getSelectedServer() {
    return getActiveList()[state.selectedServerIndex] || null;
  }

  function getActiveList() {
    if (state.activeTab === "favorites") return state.favorites;
    if (state.activeTab === "recent") return state.recent;
    return state.servers;
  }

  function joinServerLocal(serverId) {
    var server = findServerById(serverId);
    if (!server) return;
    showJoinOverlay("Connecting to " + server.name + "...");
    sendAction("joinServer", { serverId: serverId });
  }

  function joinDirectLocal(address, port) {
    showJoinOverlay("Connecting to " + address + ":" + port + "...");
    sendAction("openDirectConnect", { address: address, port: port });
  }

  function showJoinOverlay(message, isError) {
    state.joinOverlay = { message: message, error: !!isError };
    joinOverlay.classList.remove("hidden");
    if (isError) joinOverlay.classList.add("co-error");
    else joinOverlay.classList.remove("co-error");
    joinMessage.textContent = message;
    var spinner = joinOverlay.querySelector(".co-spinner");
    if (spinner) spinner.style.display = isError ? "none" : "block";
    render();
  }

  function hideJoinOverlay() {
    state.joinOverlay = null;
    joinOverlay.classList.add("hidden");
    render();
  }

  function switchTab(tabName) {
    state.activeTab = tabName;
    state.selectedTabIndex = CO_Tabs.TAB_ORDER.indexOf(tabName);
    if (state.selectedTabIndex < 0) state.selectedTabIndex = 0;
    if (tabName === "server-browser") state.focusZone = "server-list";
    else if (tabName === "direct-connect") state.focusZone = "tabs";
    sendAction("switchTab", { tabName: tabName });
    render();
  }

  function render() {
    if (!root) return;

    panel.classList.toggle("co-loading", state.isRefreshing);

    CO_Tabs.render(root, state);
    CO_ControllerPrompts.render(root, state);

    var statusEl = document.getElementById("coConnectionStatus");
    if (statusEl) {
      statusEl.textContent = String(state.connectionStatus || "Online").toUpperCase();
    }

    document.querySelectorAll(".co-tab-pane").forEach(function (pane) {
      pane.classList.toggle("active", pane.getAttribute("data-pane") === state.activeTab);
    });

    if (state.activeTab === "direct-connect") {
      CO_DirectConnect.render(root, state);
    } else {
      var listServers = state.servers;
      if (state.activeTab === "favorites") listServers = state.favorites;
      if (state.activeTab === "recent") listServers = state.recent;

      var listState = Object.assign({}, state, { servers: listServers });
      if (state.activeTab === "favorites" || state.activeTab === "recent") {
        listState.focusZone = state.focusZone === "filters" ? "server-list" : state.focusZone;
      }

      if (state.activeTab === "server-browser") {
        CO_Filters.render(root, listState);
      }

      if (state.activeTab !== "direct-connect") {
        CO_ServerDetails.render(root, listState);
      }

      var activePane = root.querySelector('.co-tab-pane[data-pane="' + state.activeTab + '"]');
      if (activePane) {
        var listEl = activePane.querySelector(".co-server-list");
        if (listEl) {
          var tempRoot = { querySelector: function (sel) {
            if (sel === ".co-server-list-wrap") return activePane.querySelector(".co-server-list-wrap");
            if (sel === ".co-server-list") return listEl;
            return root.querySelector(sel);
          }};
          CO_ServerList.render(tempRoot, listState);
        }
      }
    }

    updateServerCount();
  }

  function bindUi() {
    CO_Tabs.bind(root, function (tabName) {
      switchTab(tabName);
    });

    CO_Filters.bind(root, function (name, value) {
      state.filters[name] = value;
      sendAction("setFilter", { filterName: name, value: value });
      applyLocalFilters();
      render();
    }, resetLocalFilters);

    root.addEventListener("click", function (e) {
      var row = e.target.closest(".co-tab-pane.active .co-server-row");
      if (!row) return;
      state.selectedServerIndex = parseInt(row.getAttribute("data-index"), 10);
      render();
    });

    root.addEventListener("dblclick", function (e) {
      var row = e.target.closest(".co-tab-pane.active .co-server-row");
      if (!row) return;
      state.selectedServerIndex = parseInt(row.getAttribute("data-index"), 10);
      joinSelected();
    });

    CO_DirectConnect.bind(root, function (address, port) {
      state.directConnect = { address: address, port: port };
      joinDirectLocal(address, port);
    });

    document.addEventListener("keydown", onKeyDown);
  }

  function onKeyDown(e) {
    if (state.joinOverlay && state.joinOverlay.error && e.key === "Escape") {
      hideJoinOverlay();
      return;
    }
    if (state.activeTab === "direct-connect") return;
    handleControllerButton(mapKeyToButton(e.key), "down");
  }

  function mapKeyToButton(key) {
    var map = {
      ArrowUp: "dpad_up", ArrowDown: "dpad_down", ArrowLeft: "dpad_left", ArrowRight: "dpad_right",
      Enter: "a", Escape: "b", " ": "a", r: "x", f: "y", q: "lb", e: "rb"
    };
    return map[key] || null;
  }

  function handleControllerButton(button, phase) {
    if (!button || phase !== "down") return;
    if (state.joinOverlay) {
      if (button === "b") hideJoinOverlay();
      return;
    }

    if (button === "lb" || button === "rb") {
      var idx = state.selectedTabIndex;
      idx = button === "lb" ? idx - 1 : idx + 1;
      if (idx < 0) idx = CO_Tabs.TAB_ORDER.length - 1;
      if (idx >= CO_Tabs.TAB_ORDER.length) idx = 0;
      switchTab(CO_Tabs.TAB_ORDER[idx]);
      return;
    }

    if (button === "b") {
      sendAction("closeBrowser", {});
      return;
    }

    if (state.activeTab === "direct-connect") {
      if (button === "a") {
        var vals = CO_DirectConnect.getValues(root);
        joinDirectLocal(vals.address, vals.port);
      }
      return;
    }

    if (button === "a") {
      joinSelected();
      return;
    }
    if (button === "x") {
      sendAction("refreshServerList", {});
      return;
    }
    if (button === "y") {
      var sel = getSelectedServer();
      if (sel) toggleFavoriteLocal(sel.id);
      return;
    }

    navigateFocus(button);
  }

  function joinSelected() {
    var sel = getSelectedServer();
    if (!sel) return;
    joinServerLocal(sel.id);
  }

  function nextFocusZone(fromIdx, direction) {
    var zones = FOCUS_ZONES.slice();
    if (state.activeTab !== "server-browser") {
      zones = zones.filter(function (z) { return z !== "filters"; });
    }
    var current = zones.indexOf(state.focusZone);
    if (current < 0) current = fromIdx;
    var next = current + direction;
    if (next < 0 || next >= zones.length) return null;
    return zones[next];
  }

  function navigateFocus(button) {
    var list = getActiveList();

    if (button === "dpad_left") {
      var prevZone = nextFocusZone(FOCUS_ZONES.indexOf(state.focusZone), -1);
      if (prevZone) {
        state.focusZone = prevZone;
        render();
      }
      return;
    }
    if (button === "dpad_right") {
      if (state.activeTab === "direct-connect") return;
      var nextZone = nextFocusZone(FOCUS_ZONES.indexOf(state.focusZone), 1);
      if (nextZone) {
        state.focusZone = nextZone;
        render();
      }
      return;
    }

    if (state.focusZone === "tabs") {
      if (button === "dpad_up" || button === "dpad_down") {
        var dir = button === "dpad_up" ? -1 : 1;
        state.selectedTabIndex = (state.selectedTabIndex + dir + CO_Tabs.TAB_ORDER.length) % CO_Tabs.TAB_ORDER.length;
        switchTab(CO_Tabs.TAB_ORDER[state.selectedTabIndex]);
      }
      return;
    }

    if (state.focusZone === "filters") {
      var maxFilter = CO_Filters.FILTER_ROWS.length;
      if (button === "dpad_up") state.selectedFilterIndex = Math.max(0, state.selectedFilterIndex - 1);
      if (button === "dpad_down") state.selectedFilterIndex = Math.min(maxFilter, state.selectedFilterIndex + 1);
      if (button === "a" && state.selectedFilterIndex === maxFilter) resetLocalFilters();
      render();
      return;
    }

    if (state.focusZone === "server-list") {
      if (button === "dpad_up") state.selectedServerIndex = Math.max(0, state.selectedServerIndex - 1);
      if (button === "dpad_down") state.selectedServerIndex = Math.min(list.length - 1, state.selectedServerIndex + 1);
      render();
      CO_ServerList.scrollToSelected(root, state.selectedServerIndex);
      return;
    }
  }

  function startRepeat(action) {
    stopRepeat();
    repeatAction = action;
    repeatTimer = setTimeout(function tick() {
      if (repeatAction) repeatAction();
      repeatTimer = setTimeout(tick, REPEAT_RATE_MS);
    }, REPEAT_INITIAL_MS);
  }

  function stopRepeat() {
    if (repeatTimer) clearTimeout(repeatTimer);
    repeatTimer = null;
    repeatAction = null;
  }

  window.dispatchCoEvent = function (event) {
    if (!event || !event.type) return;

    switch (event.type) {
      case "serverListUpdated":
        state.allServers = event.servers || [];
        applyLocalFilters();
        break;
      case "serverListRefreshStarted":
        state.isRefreshing = true;
        break;
      case "serverListRefreshFinished":
        state.isRefreshing = false;
        if (!event.success && event.error) {
          console.warn("[CO] Refresh failed:", event.error);
        }
        break;
      case "joinStarted":
        showJoinOverlay("Connecting...");
        break;
      case "joinFailed":
        showJoinOverlay(event.reason || "Connection failed", true);
        break;
      case "joinSucceeded":
        hideJoinOverlay();
        addRecent(event.serverId);
        break;
      case "connectionStatusChanged":
        state.connectionStatus = event.status || "Online";
        break;
      case "uiTheme":
        if (typeof window.applyCoTheme === "function") {
          window.applyCoTheme(event);
        }
        break;
      case "menuOpened":
        break;
      case "menuClosed":
        hideJoinOverlay();
        break;
      case "controllerInput":
        if (event.phase === "down") {
          handleControllerButton(event.button, "down");
          if (event.button === "dpad_up" || event.button === "dpad_down") {
            startRepeat(function () { handleControllerButton(event.button, "down"); });
          }
        } else if (event.phase === "up") {
          stopRepeat();
        }
        break;
      case "uiSound":
        // TODO: Wire to Fallout 4 menu sound via C++ when audio hooks are available.
        break;
      default:
        break;
    }
    render();
  };

  function addRecent(serverId) {
    var server = findServerById(serverId);
    if (!server) return;
    state.recent = state.recent.filter(function (s) { return s.id !== serverId; });
    state.recent.unshift(server);
    if (state.recent.length > 8) state.recent.pop();
  }

  window.setConnectionStatus = function (connected, logPrefix) {
    state.connectionStatus = connected ? "Connected" : "Online";
    render();
  };

  window.onBrowserShown = function () {
    dispatchCoEvent({ type: "menuOpened" });
    render();
  };

  window.coAction = window.coAction || function () {
    console.warn("[CO] coAction bridge not ready");
  };

  window.CO_App = {
    joinSelected: joinSelected,
    getState: function () { return state; }
  };

  state.allServers = (window.CO_MOCK_SERVERS || []).slice();
  applyLocalFilters();
  bindUi();
  render();
  console.log("[CO] Server browser loaded");
})();