import { session, visit } from "./api.js";
import { disposeAll } from "./charts.js";
import { onRoute, parseLocation, startRouter } from "./router.js";
import { canAccessProtected, setSession } from "./session.js";
import { renderCandidates } from "./views/candidates.js";
import { renderFans } from "./views/fans.js";
import { renderHome } from "./views/home.js";
import { renderUps, renderVideos } from "./views/rankings.js";
import { renderSystem } from "./views/system.js";
import { renderUp } from "./views/up.js";
import { renderVideo } from "./views/video.js";
import { renderAbout } from "./views/about.js";

const NAV_ITEMS = [
  { path: "/home", label: "首页", icon: "home" },
  { path: "/videos", label: "视频", icon: "video" },
  { path: "/ups", label: "UP主", icon: "up" },
  { path: "/fans", label: "粉丝", icon: "fans" },
  { path: "/about", label: "说明", icon: "info" },
];

// 登录后的「候选 / 系统」入口放在顶栏右侧（未登录显示「登录」），
// 以减轻移动端底部主导航的拥挤。
const TOPBAR_ITEMS = [
  { path: "/candidates", label: "候选" },
  { path: "/system", label: "系统" },
];

const ROUTES = [
  { pattern: /^\/home$/, view: renderHome, title: "最新动态" },
  { pattern: /^\/videos$/, view: renderVideos, title: "视频" },
  { pattern: /^\/ups$/, view: renderUps, title: "UP主" },
  { pattern: /^\/rank$/, view: renderLegacyRank, title: "榜单" },
  { pattern: /^\/video\/(\d+)$/, view: renderVideo, title: "视频详情" },
  { pattern: /^\/up\/(\d+)$/, view: renderUp, title: "UP 详情" },
  { pattern: /^\/fans$/, view: renderFans, title: "粉丝" },
  { pattern: /^\/about$/, view: renderAbout, title: "数据说明" },
  {
    pattern: /^\/candidates$/, view: renderCandidates, title: "候选池",
    beforeEnter: requireAuth,
  },
  {
    pattern: /^\/system$/, view: renderSystem, title: "系统状态",
    beforeEnter: requireAuth,
  },
];

function renderLegacyRank(root, context) {
  // 旧链接 /rank?scope=up 仍可用，但不再在页面内混排视频与 UP。
  return context.query.get("scope") === "up"
    ? renderUps(root, context)
    : renderVideos(root, context);
}

function requireAuth() {
  if (canAccessProtected()) return true;
  const { path, query } = parseLocation();
  const search = query.toString();
  window.location.assign(
    `/login?next=${encodeURIComponent(`${path}${search ? `?${search}` : ""}`)}`,
  );
  return false;
}

function icon(name) {
  const paths = {
    home: '<path d="M4 10.5 12 4l8 6.5V20a1 1 0 0 1-1 1h-5v-6H10v6H5a1 1 0 0 1-1-1z"/>',
    rank: '<path d="M5 20V10m7 10V4m7 16v-7"/>',
    video: '<rect x="3" y="5" width="18" height="14" rx="3"/><path d="m10 9 5 3-5 3z"/>',
    up: '<circle cx="12" cy="8" r="3"/><path d="M5 21a7 7 0 0 1 14 0"/><path d="m18.5 5 .6 1.2 1.4.2-1 1 .2 1.4-1.2-.6-1.2.6.2-1.4-1-1 1.4-.2z"/>',
    fans: '<path d="M16 20v-1a4 4 0 0 0-4-4H7a4 4 0 0 0-4 4v1"/><circle cx="9.5" cy="7" r="3"/><path d="M17 11a3 3 0 1 0 0-6m1 15v-1a4 4 0 0 0-3-3.8"/>',
    candidate: '<path d="M9 11l2 2 4-4"/><rect x="4" y="4" width="16" height="16" rx="3"/>',
    system: '<circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.7 1.7 0 0 0 .3 1.9l.1.1a2 2 0 1 1-2.8 2.8l-.1-.1a1.7 1.7 0 0 0-1.9-.3 1.7 1.7 0 0 0-1 1.5V21a2 2 0 1 1-4 0v-.1a1.7 1.7 0 0 0-1-1.6 1.7 1.7 0 0 0-1.9.3l-.1.1a2 2 0 1 1-2.8-2.8l.1-.1a1.7 1.7 0 0 0 .3-1.9 1.7 1.7 0 0 0-1.5-1H3a2 2 0 1 1 0-4h.1a1.7 1.7 0 0 0 1.6-1 1.7 1.7 0 0 0-.3-1.9l-.1-.1a2 2 0 1 1 2.8-2.8l.1.1a1.7 1.7 0 0 0 1.9.3H9a1.7 1.7 0 0 0 1-1.5V3a2 2 0 1 1 4 0v.1a1.7 1.7 0 0 0 1 1.5 1.7 1.7 0 0 0 1.9-.3l.1-.1a2 2 0 1 1 2.8 2.8l-.1.1a1.7 1.7 0 0 0-.3 1.9V9a1.7 1.7 0 0 0 1.5 1H21a2 2 0 1 1 0 4h-.1a1.7 1.7 0 0 0-1.5 1z"/>',
    info: '<circle cx="12" cy="12" r="9"/><path d="M12 11v5"/><circle cx="12" cy="7.5" r="1"/>',
  };
  return `<svg class="nav-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor"
    stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">${paths[name] || ""}</svg>`;
}

function renderNav() {
  const nav = document.querySelector("#nav-items");
  nav.innerHTML = NAV_ITEMS.map((item) => `
    <a class="nav-item" href="${item.path}" data-nav="${item.path}">
      ${icon(item.icon)}<span class="nav-label">${item.label}</span>
    </a>`).join("");

  // 未登录显示「登录」；可访问受保护页面时显示「候选 | 系统」。
  const loggedIn = canAccessProtected();
  document.querySelectorAll(".topbar-auth").forEach((element) => {
    element.hidden = loggedIn;
  });
  document.querySelectorAll("[data-topbar-links]").forEach((element) => {
    element.hidden = !loggedIn;
    element.innerHTML = loggedIn
      ? TOPBAR_ITEMS.map((item) => `
        <a href="${item.path}" data-topbar-nav="${item.path}">${item.label}</a>`).join("")
      : "";
  });
}

function activeNav(path) {
  let active = "/home";
  if (path.startsWith("/videos") || path.startsWith("/video/") || path.startsWith("/rank")) active = "/videos";
  else if (path.startsWith("/ups") || path.startsWith("/up/")) active = "/ups";
  else if (path.startsWith("/fans")) active = "/fans";
  else if (path.startsWith("/candidates")) active = "/candidates";
  else if (path.startsWith("/system")) active = "/system";
  else if (path.startsWith("/about")) active = "/about";
  document.querySelectorAll("[data-nav]").forEach((item) => {
    item.classList.toggle("active", item.dataset.nav === active);
  });
  document.querySelectorAll("[data-topbar-nav]").forEach((item) => {
    item.classList.toggle("active", item.dataset.topbarNav === active);
  });
}

function setTitle(route, path) {
  const title = route?.title || "看板";
  document.title = `${title} · 咻咻满 Reaction`;
  document.querySelectorAll(".brand-subtitle").forEach((element) => {
    element.textContent = title;
  });
  activeNav(path);
}

function toast(message, kind = "info") {
  const element = document.querySelector("#toast");
  if (!element) return;
  element.textContent = message;
  element.className = `toast show ${kind}`;
  window.clearTimeout(toast.timer);
  toast.timer = window.setTimeout(() => {
    element.className = "toast";
  }, 2600);
}

window.addEventListener("error", (event) => {
  const target = event.target;
  if (target instanceof HTMLImageElement) {
    target.classList.add("image-error");
    const wrapper = target.closest(".video-thumb, .hero-cover, .media-thumb, .candidate-thumb");
    wrapper?.classList.add("cover-placeholder");
  }
}, true);

async function boot() {
  const banner = document.querySelector("#preview-banner");
  try {
    const data = await session();
    setSession(data);
    if (data?.preview) {
      banner.hidden = false;
    }
  } catch {
    toast("无法连接看板服务", "error");
  }
  renderNav();
  let lastVisitPath = null;
  onRoute(({ path, route }) => {
    disposeAll();
    setTitle(route, path);
    // 访问统计：仅在路由路径变化时上报（排序/筛选等同路径重渲染不计 PV）。
    if (path !== lastVisitPath) {
      lastVisitPath = path;
      visit(path);
    }
  });
  startRouter({
    root: document.querySelector("#app"),
    outlet: document.querySelector("#view"),
    routes: ROUTES,
  });
}

window.addEventListener("unhandledrejection", (event) => {
  const reason = event.reason;
  if (reason?.name === "ApiError") {
    toast(reason.message, "error");
  }
});

boot();