(function (global) {
  "use strict";

  const ICONS = {
    "chevron-left": '<path d="m15 18-6-6 6-6"/>',
    "chevron-right": '<path d="m9 18 6-6-6-6"/>',
    "sun": '<circle cx="12" cy="12" r="4"/><path d="M12 2v2"/><path d="M12 20v2"/><path d="m4.93 4.93 1.41 1.41"/><path d="m17.66 17.66 1.41 1.41"/><path d="M2 12h2"/><path d="M20 12h2"/><path d="m6.34 17.66-1.41 1.41"/><path d="m19.07 4.93-1.41 1.41"/>',
    "moon": '<path d="M12 3a6 6 0 0 0 9 9 9 9 0 1 1-9-9Z"/>',
    "bar-chart-3": '<path d="M3 3v18h18"/><path d="M18 17V9"/><path d="M13 17V5"/><path d="M8 17v-3"/>',
    "wand-2": '<path d="m21.64 3.64-1.28-1.28a1.21 1.21 0 0 0-1.72 0L2.36 18.64a1.21 1.21 0 0 0 0 1.72l1.28 1.28a1.2 1.2 0 0 0 1.72 0L21.64 5.36a1.2 1.2 0 0 0 0-1.72Z"/><path d="m14 7 3 3"/><path d="M5 6v4"/><path d="M19 14v4"/><path d="M10 2v2"/><path d="M7 8H3"/><path d="M21 16h-4"/><path d="M11 3H9"/>',
    "notebook-pen": '<path d="M13.4 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-7.4"/><path d="M2 6h4"/><path d="M2 10h4"/><path d="M2 14h4"/><path d="M2 18h4"/><path d="m21.38 5.63-3-3a1 1 0 0 0-1.42 0l-5.01 5.01a2 2 0 0 0-.5.85l-.84 2.87a.5.5 0 0 0 .62.62l2.87-.84a2 2 0 0 0 .85-.5z"/>',
    "message-square": '<path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/>',
    "settings": '<path d="M12.22 2h-.44a2 2 0 0 0-2 2v.18a2 2 0 0 1-1 1.73l-.43.25a2 2 0 0 1-2 0l-.15-.08a2 2 0 0 0-2.73.73l-.22.38a2 2 0 0 0 .73 2.73l.15.1a2 2 0 0 1 1 1.72v.51a2 2 0 0 1-1 1.74l-.15.09a2 2 0 0 0-.73 2.73l.22.38a2 2 0 0 0 2.73.73l.15-.08a2 2 0 0 1 2 0l.43.25a2 2 0 0 1 1 1.73V20a2 2 0 0 0 2 2h.44a2 2 0 0 0 2-2v-.18a2 2 0 0 1 1-1.73l.43-.25a2 2 0 0 1 2 0l.15.08a2 2 0 0 0 2.73-.73l.22-.39a2 2 0 0 0-.73-2.73l-.15-.08a2 2 0 0 1-1-1.74v-.5a2 2 0 0 1 1-1.74l.15-.09a2 2 0 0 0 .73-2.73l-.22-.38a2 2 0 0 0-2.73-.73l-.15.08a2 2 0 0 1-2 0l-.43-.25a2 2 0 0 1-1-1.73V4a2 2 0 0 0-2-2z"/><circle cx="12" cy="12" r="3"/>',
    "inbox": '<path d="M22 12h-6l-2 3h-4l-2-3H2"/><path d="M5.45 5.11 2 12v6a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2v-6l-3.45-6.89A2 2 0 0 0 16.76 4H7.24a2 2 0 0 0-1.79 1.11z"/>'
  };

  function icon(name, size) {
    const body = ICONS[name] || "";
    return '<svg width="' + (size || 22) + '" height="' + (size || 22) + '" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">' + body + "</svg>";
  }

  function escapeHtml(value) {
    return String(value == null ? "" : value).replace(/[&<>"']/g, function (ch) {
      return { "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[ch];
    });
  }

  const stack = [];
  let internalNav = 0;
  let authMode = "login";

  function currentHash() {
    let hash = window.location.hash || "";
    if (!hash || hash === "#" || hash === "#/") return "#/home";
    if (hash.charAt(0) !== "#") hash = "#" + hash;
    return hash;
  }

  function routeOf(hash) {
    const path = hash.replace(/^#\/?/, "");
    const parts = path.split("/").filter(Boolean);
    return { name: parts[0] || "home", params: parts.slice(1) };
  }

  function currentRoute() {
    return routeOf(stack.length ? stack[stack.length - 1] : currentHash());
  }

  function setHash(hash) {
    internalNav++;
    window.location.hash = hash;
  }

  function navigate(hash) {
    stack.push(hash);
    setHash(hash);
    render();
  }

  function replace(hash) {
    if (stack.length) stack[stack.length - 1] = hash;
    else stack.push(hash);
    setHash(hash);
    render();
  }

  function parentRoute(route) {
    if (route.name === "hub") return "#/home";
    if (route.name === "feature") return "#/hub/" + route.params[0];
    if (route.name === "assistant") return "#/home";
    return null;
  }

  function back() {
    if (stack.length > 1) {
      stack.pop();
      setHash(stack[stack.length - 1]);
      render();
      return;
    }
    const parent = parentRoute(currentRoute());
    replace(parent || "#/home");
  }

  function updateHeader(options) {
    document.getElementById("m-title").textContent = options.title || "小白复盘";
    document.getElementById("m-back").hidden = !options.back;
    document.getElementById("m-actions").innerHTML = options.actions || "";
  }

  function themeToggleHtml() {
    const dark = document.getElementById("m-app").dataset.theme === "dark";
    const label = dark ? "切换到日间模式" : "切换到夜间模式";
    return '<button class="m-header-btn" type="button" data-theme-toggle aria-label="' + label + '" aria-pressed="' + (dark ? "true" : "false") + '">' + icon(dark ? "sun" : "moon") + "</button>";
  }

  function placeholderHtml(title, subtitle) {
    return '<div class="m-placeholder">' +
      '<span class="m-placeholder-icon">' + icon("inbox", 26) + "</span>" +
      "<h2>" + escapeHtml(title) + "</h2>" +
      "<p>" + escapeHtml(subtitle || "该页面将在后续批次实现，返回即可继续浏览。") + "</p>" +
      "</div>";
  }

  function findFeatureLabel(key) {
    const hubs = global.MobileNav.hubs;
    for (const hubKey in hubs) {
      const items = hubs[hubKey].items || [];
      for (const item of items) {
        if (item.key === key) return item.label;
      }
    }
    return null;
  }

  function renderHome() {
    updateHeader({ title: "小白复盘", back: false, actions: themeToggleHtml() });
    const items = global.MobileNav.entries.map(function (entry) {
      const route = entry.key === "assistant" ? "#/assistant/chat" : "#/hub/" + entry.key;
      return '<li>' +
        '<button class="m-entry" type="button" data-route="' + route + '">' +
        '<span class="m-entry-icon">' + icon(entry.icon) + "</span>" +
        '<span class="m-entry-body"><strong>' + escapeHtml(entry.title) + "</strong><small>" + escapeHtml(entry.subtitle) + "</small></span>" +
        '<span class="m-entry-chevron">' + icon("chevron-right", 20) + "</span>" +
        "</button></li>";
    }).join("");
    document.getElementById("m-view").innerHTML = '<ul class="m-entry-list">' + items + "</ul>";
  }

  function renderHub(key) {
    const hub = global.MobileNav.hubs[key];
    const title = hub ? hub.title : key;
    updateHeader({ title: title, back: true });
    document.getElementById("m-view").innerHTML = placeholderHtml(title, "该入口的图标页将在后续批次实现。");
  }

  function renderFeature(key) {
    const title = findFeatureLabel(key) || key;
    updateHeader({ title: title, back: true });
    document.getElementById("m-view").innerHTML = placeholderHtml(title, "该功能页将在后续批次实现。");
  }

  function renderAssistant() {
    updateHeader({ title: "复盘助手", back: true });
    document.getElementById("m-view").innerHTML = placeholderHtml("复盘助手", "聊天工作台将在后续批次实现。");
  }

  function renderAuth() {
    updateHeader({ title: "小白复盘", back: false, actions: "" });
    document.getElementById("m-view").innerHTML = [
      '<div class="m-auth">',
      '<div class="m-auth-brand">',
      '<span class="m-brand-mark">复</span>',
      '<h2>小白复盘</h2>',
      '<p>登录后进入你的复盘空间</p>',
      "</div>",
      '<div class="m-auth-tabs">',
      '<button class="m-auth-tab active" type="button" data-auth-mode="login">登录</button>',
      '<button class="m-auth-tab" type="button" data-auth-mode="register">注册</button>',
      "</div>",
      '<form id="m-auth-form">',
      '<label class="m-form-field"><span>账号名</span><input id="m-auth-username" type="text" minlength="3" maxlength="30" autocomplete="username" required></label>',
      '<label class="m-form-field"><span>密码</span><input id="m-auth-password" type="password" minlength="8" maxlength="128" autocomplete="current-password" required></label>',
      '<label class="m-form-field" id="m-auth-confirm-field" hidden><span>确认密码</span><input id="m-auth-confirm" type="password" minlength="8" maxlength="128" autocomplete="new-password"></label>',
      '<p class="m-auth-error" id="m-auth-error" hidden></p>',
      '<button class="m-btn-primary" id="m-auth-submit" type="submit">登录</button>',
      "</form>",
      "</div>"
    ].join("");
    authMode = "login";
    bindAuth();
  }

  function setAuthMode(mode) {
    authMode = mode === "register" ? "register" : "login";
    document.querySelectorAll("[data-auth-mode]").forEach(function (button) {
      button.classList.toggle("active", button.dataset.authMode === authMode);
    });
    document.getElementById("m-auth-confirm-field").hidden = authMode !== "register";
    document.getElementById("m-auth-confirm").required = authMode === "register";
    document.getElementById("m-auth-password").autocomplete = authMode === "register" ? "new-password" : "current-password";
    document.getElementById("m-auth-submit").textContent = authMode === "register" ? "注册并进入" : "登录";
    document.getElementById("m-auth-error").hidden = true;
  }

  function bindAuth() {
    document.querySelectorAll("[data-auth-mode]").forEach(function (button) {
      button.addEventListener("click", function () { setAuthMode(button.dataset.authMode); });
    });
    document.getElementById("m-auth-form").addEventListener("submit", submitAuth);
  }

  async function submitAuth(event) {
    event.preventDefault();
    const username = document.getElementById("m-auth-username").value.trim();
    const password = document.getElementById("m-auth-password").value;
    const errorElement = document.getElementById("m-auth-error");
    if (authMode === "register" && password !== document.getElementById("m-auth-confirm").value) {
      errorElement.textContent = "两次输入的密码不一致。";
      errorElement.hidden = false;
      return;
    }
    const submit = document.getElementById("m-auth-submit");
    submit.disabled = true;
    try {
      if (authMode === "register") {
        await global.MobileSession.register(username, password);
      } else {
        await global.MobileSession.login(username, password);
      }
      replace("#/home");
    } catch (error) {
      errorElement.textContent = error.message || "账号操作失败";
      errorElement.hidden = false;
    } finally {
      submit.disabled = false;
    }
  }

  function render() {
    const route = currentRoute();
    if (route.name === "hub") renderHub(route.params[0]);
    else if (route.name === "feature") renderFeature(route.params.join("/"));
    else if (route.name === "assistant") renderAssistant();
    else if (route.name === "auth") renderAuth();
    else renderHome();
  }

  function bindGlobalEvents() {
    document.getElementById("m-view").addEventListener("click", function (event) {
      const entry = event.target.closest("[data-route]");
      if (entry) {
        navigate(entry.dataset.route);
      }
    });
    document.getElementById("m-back").addEventListener("click", back);
    document.addEventListener("click", function (event) {
      const toggle = event.target.closest("[data-theme-toggle]");
      if (!toggle) return;
      global.MobileTheme.toggle();
      if (currentRoute().name === "home") {
        document.getElementById("m-actions").innerHTML = themeToggleHtml();
      }
    });
    window.addEventListener("hashchange", function () {
      if (internalNav > 0) {
        internalNav--;
        return;
      }
      const hash = currentHash();
      if (stack.length > 1 && hash === stack[stack.length - 2]) {
        stack.pop();
      } else if (hash !== stack[stack.length - 1]) {
        stack.push(hash);
      }
      render();
    });
  }

  function init() {
    bindGlobalEvents();
    stack.length = 0;
    stack.push(currentHash());
    render();
  }

  global.MobileRouter = {
    init: init,
    navigate: navigate,
    replace: replace,
    back: back,
    render: render,
    currentRoute: currentRoute
  };
})(window);