(function () {
  "use strict";

  // ── C++ / F4SE bridge placeholders ─────────────────────────────
  window.CommonwealthOnlineUI = {
    openGameSettings: function () {
      console.log("[CO UI] Request open vanilla Fallout 4 SettingsMenu");
    },
    setMultiplayerSetting: function (key, value) {
      console.log("[CO UI] Multiplayer setting changed:", key, value);
    },
    onBack: function () {
      console.log("[CO UI] Back requested from main menu");
    },
    onOpenView: function (viewName) {
      console.log("[CO UI] Open view:", viewName);
    }
  };

  // ── Pointer mode API for C++ invocation ─────────────────────────
  window.CO_App = {
    setPointerMode: function (mode) {
      console.log("[CO Main Menu] Pointer mode:", mode);
    }
  };

  // ── Controller input handler ─────────────────────────────────────
  window.handleControllerInput = function (button, phase) {
    if (phase === "down") {
      switch (button) {
        case "dpad_up":
          moveSelection(-1);
          break;
        case "dpad_down":
          moveSelection(1);
          break;
        case "a":
          activateSelected();
          break;
        case "b":
          if (viewMode === "settings") {
            exitSettingsMode();
          }
          break;
      }
    }
  };

  // ── Compute UI scale ───────────────────────────────────────────
  function updateScale() {
    var MIN_SCALE = 0.5;
    var MAX_SCALE = 1.6;
    var BASELINE_WIDTH = 1920;
    var BASELINE_HEIGHT = 1080;
    var scale = Math.min(
      window.innerWidth / BASELINE_WIDTH,
      window.innerHeight / BASELINE_HEIGHT
    );
    scale = Math.max(MIN_SCALE, Math.min(MAX_SCALE, scale));
    document.documentElement.style.setProperty("--co-ui-scale", String(scale));
  }

  updateScale();
  window.addEventListener("resize", updateScale);

  // ── Tint Xbox prompt glyphs to menu amber ──────────────────────
  var GLYPH_WHITE_THRESHOLD = 200;
  var GLYPH_BLACK_THRESHOLD = 40;
  var glyphTintCache = {};

  function getAmberTint() {
    var style = getComputedStyle(document.documentElement);
    var amber = style.getPropertyValue("--co-amber").trim() || "#c9a84a";
    var hex = amber.replace("#", "");
    if (hex.length === 3) {
      hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
    }
    return {
      r: parseInt(hex.slice(0, 2), 16) || 201,
      g: parseInt(hex.slice(2, 4), 16) || 168,
      b: parseInt(hex.slice(4, 6), 16) || 74
    };
  }

  function classifyGlyphPixel(r, g, b) {
    if (r >= GLYPH_WHITE_THRESHOLD && g >= GLYPH_WHITE_THRESHOLD && b >= GLYPH_WHITE_THRESHOLD) {
      return "white";
    }
    if (r <= GLYPH_BLACK_THRESHOLD && g <= GLYPH_BLACK_THRESHOLD && b <= GLYPH_BLACK_THRESHOLD) {
      return "black";
    }
    return "edge";
  }

  function tintGlyphImageData(imageData, color) {
    var data = imageData.data;
    for (var i = 0; i < data.length; i += 4) {
      if (data[i + 3] < 4) {
        data[i + 3] = 0;
        continue;
      }
      var kind = classifyGlyphPixel(data[i], data[i + 1], data[i + 2]);
      if (kind === "white") {
        data[i] = color.r;
        data[i + 1] = color.g;
        data[i + 2] = color.b;
      } else if (kind === "black") {
        data[i] = 0;
        data[i + 1] = 0;
        data[i + 2] = 0;
      } else {
        var lum = (data[i] + data[i + 1] + data[i + 2]) / (3 * 255);
        data[i] = Math.round(lum * color.r);
        data[i + 1] = Math.round(lum * color.g);
        data[i + 2] = Math.round(lum * color.b);
      }
    }
    return imageData;
  }

  function tintGlyphImage(url, color, done) {
    var key = url + "|" + color.r + "," + color.g + "," + color.b;
    if (glyphTintCache[key]) {
      done(glyphTintCache[key]);
      return;
    }
    var img = new Image();
    img.onload = function () {
      var canvas = document.createElement("canvas");
      canvas.width = img.naturalWidth;
      canvas.height = img.naturalHeight;
      var ctx = canvas.getContext("2d");
      if (!ctx) {
        done(null);
        return;
      }
      ctx.drawImage(img, 0, 0);
      try {
        ctx.putImageData(
          tintGlyphImageData(ctx.getImageData(0, 0, canvas.width, canvas.height), color),
          0,
          0
        );
      } catch (err) {
        done(null);
        return;
      }
      var dataUrl = canvas.toDataURL("image/png");
      glyphTintCache[key] = dataUrl;
      done(dataUrl);
    };
    img.onerror = function () {
      done(null);
    };
    img.src = url;
  }

  function hydratePromptGlyphs() {
    var color = getAmberTint();
    var imgs = document.querySelectorAll(".prompt__glyph-img[data-glyph-src]");
    for (var i = 0; i < imgs.length; i++) {
      (function (img) {
        var src = img.getAttribute("data-glyph-src");
        if (!src) {
          return;
        }
        tintGlyphImage(src, color, function (dataUrl) {
          if (dataUrl) {
            img.src = dataUrl;
          }
        });
      })(imgs[i]);
    }
  }

  hydratePromptGlyphs();

  // ── DOM refs ───────────────────────────────────────────────────

  var mainScreen = document.getElementById("mainScreen");
  var menu = document.getElementById("menu");
  var settingsPanel = document.getElementById("settingsPanel");
  var mainPromptBar = document.getElementById("mainPromptBar");
  var settingsPromptBar = document.getElementById("settingsPromptBar");

  if (!menu || !settingsPanel || !window.CO_Settings) {
    return;
  }

  var settingsController = null;

  var items = Array.prototype.slice.call(menu.querySelectorAll(".menu-item"));
  var SETTINGS_INDEX = 2;

  // viewMode: "menu" | "settings"
  var viewMode = "menu";
  var selectedIndex = -1;
  var SETTINGS_TRANSITION_MS = 220;
  var settingsHideFallbackId = 0;
  var settingsHideOnTransitionEnd = null;

  // ── Main menu selection ────────────────────────────────────────

  function setSelected(index) {
    if (index >= items.length) {
      return;
    }

    selectedIndex = index < 0 ? -1 : index;

    items.forEach(function (item, i) {
      var isSelected = i === selectedIndex;
      item.classList.toggle("is-selected", isSelected);
      item.setAttribute("aria-selected", isSelected ? "true" : "false");
      item.tabIndex = isSelected ? 0 : -1;
    });
  }

  function moveSelection(delta) {
    var next = selectedIndex + delta;
    if (selectedIndex < 0) {
      next = delta > 0 ? 0 : items.length - 1;
    } else if (next < 0) {
      next = items.length - 1;
    } else if (next >= items.length) {
      next = 0;
    }

    // Skip disabled items
    var guard = 0;
    while (items[next] && items[next].classList.contains("is-disabled") && guard < items.length) {
      next += delta > 0 ? 1 : -1;
      if (next < 0) {
        next = items.length - 1;
      } else if (next >= items.length) {
        next = 0;
      }
      guard += 1;
    }

    setSelected(next);
  }

  function activateSelected() {
    var item = items[selectedIndex];
    if (!item || item.classList.contains("is-disabled")) {
      return;
    }

    var action = item.getAttribute("data-action");
    console.log("[CO Main Menu] Selected:", action);

    if (action === "settings") {
      enterSettingsMode();
    } else {
      window.CommonwealthOnlineUI.onOpenView(action);
      if (action !== "quit") {
        setSelected(-1);
      }
    }
  }

  items.forEach(function (item, index) {
    item.addEventListener("click", function () {
      if (viewMode === "settings") {
        if (index === SETTINGS_INDEX) {
          return;
        }
        exitSettingsMode();
      }
      if (item.classList.contains("is-disabled")) {
        return;
      }
      setSelected(index);
      activateSelected();
    });
  });

  // ── View mode transitions ──────────────────────────────────────

  function cancelSettingsPanelHide() {
    if (settingsHideFallbackId) {
      window.clearTimeout(settingsHideFallbackId);
      settingsHideFallbackId = 0;
    }
    if (settingsHideOnTransitionEnd) {
      settingsPanel.removeEventListener("transitionend", settingsHideOnTransitionEnd);
      settingsHideOnTransitionEnd = null;
    }
  }

  function showSettingsPanelAnimated() {
    cancelSettingsPanelHide();
    if (mainScreen) {
      mainScreen.classList.add("is-settings-mode");
    }
    settingsPanel.hidden = false;
    settingsPanel.classList.remove("is-open");
    void settingsPanel.offsetWidth;
    settingsPanel.classList.add("is-open");
  }

  function hideSettingsPanelAnimated(done) {
    if (settingsPanel.hidden) {
      if (done) {
        done();
      }
      return;
    }

    cancelSettingsPanelHide();
    settingsPanel.classList.remove("is-open");

    var completed = false;

    function finishHide() {
      if (completed) {
        return;
      }
      completed = true;
      cancelSettingsPanelHide();
      if (viewMode === "settings" || settingsPanel.classList.contains("is-open")) {
        if (done) {
          done();
        }
        return;
      }
      if (mainScreen) {
        mainScreen.classList.remove("is-settings-mode");
      }
      settingsPanel.hidden = true;
      if (done) {
        done();
      }
    }

    settingsHideOnTransitionEnd = function (event) {
      if (event.target !== settingsPanel || event.propertyName !== "opacity") {
        return;
      }
      finishHide();
    };

    settingsPanel.addEventListener("transitionend", settingsHideOnTransitionEnd);
    settingsHideFallbackId = window.setTimeout(finishHide, SETTINGS_TRANSITION_MS + 80);
  }

  function enterSettingsMode() {
    viewMode = "settings";

    console.log("[CO Main Menu] Entering settings mode");
    window.CommonwealthOnlineUI.onOpenView("settings");

    setSelected(SETTINGS_INDEX);

    showSettingsPanelAnimated();
    if (mainPromptBar) {
      mainPromptBar.hidden = true;
    }

    settingsController.show();
  }

  function exitSettingsMode() {
    if (viewMode !== "settings") {
      return;
    }

    viewMode = "menu";
    console.log("[CO Main Menu] Exiting settings mode");
    window.CommonwealthOnlineUI.onBack();

    settingsController.hide();

    hideSettingsPanelAnimated(function () {
      if (mainPromptBar) {
        mainPromptBar.hidden = false;
      }
      setSelected(SETTINGS_INDEX);
    });
  }

  settingsController = window.CO_Settings.create({
    mount: settingsPanel,
    promptBar: settingsPromptBar,
    bridge: window.CommonwealthOnlineUI,
    layout: "embedded",
    onBack: function () {
      exitSettingsMode();
    }
  });

  // ── Keyboard navigation ────────────────────────────────────────

  function handleMenuKeydown(event) {
    switch (event.key) {
      case "ArrowUp":
        event.preventDefault();
        moveSelection(-1);
        break;
      case "ArrowDown":
        event.preventDefault();
        moveSelection(1);
        break;
      case "Enter":
      case " ":
        event.preventDefault();
        activateSelected();
        break;
      case "Escape":
        event.preventDefault();
        console.log("[CO Main Menu] Back");
        window.CommonwealthOnlineUI.onBack();
        break;
      default:
        break;
    }
  }

  document.addEventListener("keydown", function (event) {
    if (viewMode === "settings") {
      settingsController.handleKeydown(event);
      return;
    }
    handleMenuKeydown(event);
  });

})();