import { useEffect, useState, type ReactNode } from "react";
import { Link, useNavigate } from "react-router-dom";
import { useAuth } from "../App";
import { api } from "../lib/client";
import type { Workspace } from "../lib/types";
import {
  Book,
  ChevronDown,
  Columns,
  Inbox,
  Logo,
  Logout,
  TicketIcon,
  Users,
  X,
} from "./icons";

export type Section = "tasks" | "board" | "tickets" | "knowledge" | "members";

const NAV: { key: Section; label: string; to: (id: string) => string; icon: ReactNode }[] = [
  { key: "tasks", label: "任务", to: (id) => `/w/${id}`, icon: <Inbox size={16} /> },
  { key: "board", label: "看板", to: (id) => `/w/${id}/board`, icon: <Columns size={16} /> },
  { key: "tickets", label: "工单", to: (id) => `/w/${id}/tickets`, icon: <TicketIcon size={16} /> },
  { key: "knowledge", label: "知识", to: (id) => `/w/${id}/knowledge`, icon: <Book size={16} /> },
  { key: "members", label: "成员", to: (id) => `/w/${id}/members`, icon: <Users size={16} /> },
];

function initial(name: string) {
  return name.trim().slice(0, 1).toUpperCase() || "W";
}

const ROLE_TEXT: Record<string, string> = {
  owner: "所有者",
  admin: "管理员",
  member: "成员",
  guest: "访客",
};

export function AppShell({
  wsId,
  active,
  children,
}: {
  wsId: string;
  active: Section;
  children: ReactNode;
}) {
  const { user, workspaces, signOut } = useAuth();
  const navigate = useNavigate();
  const [fetched, setFetched] = useState<Workspace | null>(null);
  const [unread, setUnread] = useState(0);
  const [switcher, setSwitcher] = useState(false);

  // 深链直接进来时 workspaces 还没加载好，单独取一次工作区信息
  const ws = workspaces.find((w) => w.id === wsId) ?? fetched;

  useEffect(() => {
    if (ws || !wsId) return;
    let alive = true;
    api
      .get<Workspace>(`/workspaces/${wsId}`)
      .then((w) => {
        if (alive) setFetched(w);
      })
      .catch(() => undefined);
    return () => {
      alive = false;
    };
  }, [ws, wsId]);

  useEffect(() => {
    if (!wsId) return;
    let alive = true;
    const load = async () => {
      try {
        const r = await api.get<{ count: number }>(`/workspaces/${wsId}/notifications/unread-count`);
        if (alive) setUnread(r.count);
      } catch {
        /* 未读数失败不该影响主流程 */
      }
    };
    void load();
    const timer = window.setInterval(load, 30_000);
    return () => {
      alive = false;
      window.clearInterval(timer);
    };
  }, [wsId]);

  if (!ws) {
    return (
      <div className="flex min-h-full items-center justify-center bg-paper-100">
        <div className="flex items-center gap-2 text-sm text-ink-400">
          <span className="h-2 w-2 animate-pulse rounded-full bg-primary-400" />
          正在打开工作区…
        </div>
      </div>
    );
  }

  const phoneMasked = user?.phone
    ? user.phone.replace(/^(\d{3})\d{4}(\d{4})$/, "$1 **** $2")
    : "";

  return (
    <div className="flex min-h-full flex-col bg-paper-100 lg:flex-row">
      {/* —— 侧栏（桌面）—— */}
      <aside className="sticky top-0 z-20 hidden h-screen w-60 shrink-0 flex-col border-r border-line-200 bg-paper-50 lg:flex xl:w-[264px]">
        <div className="px-5 pb-4 pt-5">
          <Link to="/" className="flex items-center gap-2.5">
            <Logo size={30} />
            <div className="leading-tight">
              <div className="text-sm font-semibold tracking-tight text-ink-900">达道Task</div>
              <div className="text-2xs text-ink-400">任务 · 工单 · 知识</div>
            </div>
          </Link>
        </div>

        <div className="relative px-3">
          <button
            onClick={() => setSwitcher((v) => !v)}
            className="flex w-full items-center gap-2 rounded-xl border border-line-200 bg-white px-2.5 py-2 text-left transition hover:border-line-300"
          >
            <span className="grid h-6 w-6 shrink-0 place-items-center rounded-md bg-primary-900 text-2xs font-semibold text-paper-50">
              {initial(ws.name)}
            </span>
            <span className="min-w-0 flex-1">
              <span className="block truncate text-xs font-medium text-ink-800">{ws.name}</span>
              <span className="block text-2xs text-ink-400">{ROLE_TEXT[ws.role] ?? ws.role}</span>
            </span>
            <ChevronDown size={14} className="shrink-0 text-ink-400" />
          </button>

          {switcher ? (
            <>
              <div className="fixed inset-0 z-20" onClick={() => setSwitcher(false)} />
              <div className="absolute left-3 right-3 top-[calc(100%+4px)] z-30 animate-slide-up overflow-hidden rounded-xl border border-line-200 bg-white p-1 shadow-pop">
                <div className="px-2 py-1 text-2xs font-medium text-ink-400">切换工作区</div>
                {workspaces.map((w) => (
                  <button
                    key={w.id}
                    onClick={() => {
                      setSwitcher(false);
                      const nav = NAV.find((n) => n.key === active);
                      navigate(nav ? nav.to(w.id) : `/w/${w.id}`);
                    }}
                    className={`flex w-full items-center gap-2 rounded-lg px-2 py-1.5 text-left text-xs transition hover:bg-paper-100 ${
                      w.id === ws.id ? "bg-paper-100 font-medium text-ink-900" : "text-ink-600"
                    }`}
                  >
                    <span className="grid h-5 w-5 place-items-center rounded bg-line-100 text-2xs font-semibold text-ink-600">
                      {initial(w.name)}
                    </span>
                    <span className="truncate">{w.name}</span>
                  </button>
                ))}
                <div className="my-1 h-px bg-line-100" />
                <Link
                  to="/"
                  onClick={() => setSwitcher(false)}
                  className="flex w-full items-center rounded-lg px-2 py-1.5 text-xs text-ink-500 hover:bg-paper-100 hover:text-ink-800"
                >
                  全部工作区
                </Link>
              </div>
            </>
          ) : null}
        </div>

        <nav className="mt-6 flex flex-1 flex-col gap-0.5 px-3">
          {NAV.map((n) => {
            const isActive = n.key === active;
            return (
              <Link key={n.key} to={n.to(ws.id)} className={`nav-item ${isActive ? "nav-item-active" : ""}`}>
                <span className={isActive ? "text-primary-200" : "text-ink-400"}>{n.icon}</span>
                {n.label}
                {n.key === "tickets" && unread > 0 ? (
                  <span
                    className={`ml-auto rounded-full px-1.5 py-px text-2xs font-semibold tabular-nums ${
                      isActive ? "bg-clay-500 text-white" : "bg-clay-500/12 text-clay-600"
                    }`}
                  >
                    {unread > 99 ? "99+" : unread}
                  </span>
                ) : null}
              </Link>
            );
          })}
        </nav>

        <div className="border-t border-line-200 px-3 py-3">
          <div className="flex items-center gap-2">
            <span className="grid h-7 w-7 place-items-center rounded-full bg-ink-200 text-2xs font-semibold text-ink-700">
              {initial(user?.nickname ?? "我")}
            </span>
            <div className="min-w-0 flex-1">
              <div className="truncate text-xs font-medium text-ink-800">{user?.nickname}</div>
              <div className="truncate text-2xs text-ink-400">{phoneMasked}</div>
            </div>
            <button
              onClick={signOut}
              title="退出登录"
              className="rounded-md p-1.5 text-ink-400 transition hover:bg-ink-100 hover:text-ink-700"
            >
              <Logout size={15} />
            </button>
          </div>
        </div>
      </aside>

      {/* —— 顶部条（移动端）—— */}
      <header className="sticky top-0 z-20 border-b border-line-200 bg-paper-50/95 backdrop-blur lg:hidden">
        <div className="flex items-center justify-between px-4 py-2.5">
          <Link to="/" className="flex items-center gap-2">
            <Logo size={24} />
            <span className="max-w-[42vw] truncate text-sm font-semibold text-ink-900">{ws.name}</span>
          </Link>
          <div className="flex items-center gap-1">
            {unread > 0 ? (
              <span className="rounded-full bg-clay-500 px-1.5 py-px text-2xs font-semibold text-white">
                {unread}
              </span>
            ) : null}
            <button
              onClick={signOut}
              className="rounded-md p-1.5 text-ink-400 hover:bg-ink-100"
              aria-label="退出登录"
            >
              <X size={16} />
            </button>
          </div>
        </div>
        <nav className="no-scrollbar flex gap-1 overflow-x-auto px-3 pb-2">
          {NAV.map((n) => (
            <Link
              key={n.key}
              to={n.to(ws.id)}
              className={`whitespace-nowrap rounded-md px-2.5 py-1 text-xs font-medium ${
                n.key === active ? "bg-primary-900 text-paper-50" : "text-ink-500"
              }`}
            >
              {n.label}
            </Link>
          ))}
        </nav>
      </header>

      <main className="min-w-0 flex-1">
        {/*
          内容区随窗口变宽（不再固定 max-w-6xl 居中）：
          侧栏贴左，内容从侧栏右侧一直铺到右边距，宽屏下不留"两边各一大块空白"。
          文字类的阅读宽度靠各自的 max-w-3xl 约束，列表/看板这类适合铺开的结构则吃满。
        */}
        <div className="w-full px-5 py-6 lg:px-8 lg:py-8 xl:px-12 2xl:px-16">{children}</div>
      </main>
    </div>
  );
}