import { useEffect, useState } from "react";
import { Outlet, useLocation, useNavigate } from "react-router";

import type { Route } from "./+types/platform";
import { Sidebar } from "../components/common/Sidebar";
import { Toast } from "../components/common/Toast";
import { Topbar } from "../components/common/Topbar";
import { useApi, useAuth } from "../context/AuthContext";
import { useEditSessionLifecycle } from "../features/platform/hooks/useEditSessionLifecycle";
import {
  bindScriptWorkspaceApi,
  editSessionHandle,
  useScriptWorkspaceStore,
} from "../features/platform/state/scriptWorkspaceStore";
import { useUiStore } from "../features/platform/state/uiStore";
import { bindAdminApi } from "../features/admin/state/adminStore";
import { bindSchedulesApi } from "../features/schedules/state/schedulesStore";

import "../styles/platform.css";

type ActivePage = "home" | "scripts" | "schedules" | "system";

function pageFromPath(pathname: string): ActivePage {
  const page = pathname.replace(/^\/+|\/+$/g, "");
  return ["scripts", "schedules", "system"].includes(page)
    ? (page as ActivePage)
    : "home";
}

function pathForPage(page: ActivePage): string {
  return page === "home" ? "/workbench" : `/${page}`;
}

export function meta({}: Route.MetaArgs) {
  return [
    { title: "模型实验开发平台" },
    { name: "description", content: "模型实验、脚本版本与 DAG 调度平台" },
  ];
}

export default function PlatformLayout() {
  const { currentWorkspace } = useAuth();
  if (!currentWorkspace) {
    return (
      <div
        className="app-shell"
        style={{ display: "flex", alignItems: "center", justifyContent: "center" }}
      >
        <div style={{ textAlign: "center" }}>
          <span style={{ fontSize: 18 }}>加载中…</span>
        </div>
      </div>
    );
  }
  return <AuthenticatedLayout />;
}

function AuthenticatedLayout() {
  const api = useApi();
  const location = useLocation();
  const navigate = useNavigate();
  const activePage = pageFromPath(location.pathname);
  const auth = useAuth();
  const {
    user,
    workspaces,
    currentWorkspace,
    setCurrentWorkspace,
    logout,
  } = auth;

  const apiOnline = useScriptWorkspaceStore((s) => s.apiOnline);
  const endEditing = useScriptWorkspaceStore((s) => s.endEditing);
  const selectScript = useScriptWorkspaceStore((s) => s.selectScript);

  const toast = useUiStore((s) => s.toast);
  const dismissToast = useUiStore((s) => s.dismissToast);
  const workspaceMenuOpen = useUiStore((s) => s.workspaceMenuOpen);
  const setWorkspaceMenuOpen = useUiStore((s) => s.setWorkspaceMenuOpen);

  const [sidebarCollapsed, setSidebarCollapsed] = useState(false);

  // 绑定 api 到 script workspace store。
  // 必须放在 render body(同步),不能用 useEffect([api]) + cleanup —
  // 后者会在 deps 变化时先 cleanup(null),再让 ScriptsPage 的 useEffect 跑,
  // 此时 _api 为 null,load() 抛 "script workspace API 未绑定"。
  bindScriptWorkspaceApi(api);
  bindSchedulesApi(api);
  bindAdminApi(api);
  useEffect(() => {
    return () => {
      bindScriptWorkspaceApi(null);
      bindSchedulesApi(null);
      bindAdminApi(null);
    };
  }, []);

  // 心跳 / cleanup / 切页结束编辑 / 卸载前释放
  useEditSessionLifecycle({ activePage });

  // toast 自动消失
  useEffect(() => {
    if (!toast) return;
    const timer = window.setTimeout(dismissToast, 3200);
    return () => window.clearTimeout(timer);
  }, [toast, dismissToast]);

  return (
    <div className="app-shell">
      <Sidebar
        activePage={activePage}
        collapsed={sidebarCollapsed}
        onNavigate={(page) => navigate(pathForPage(page))}
        onToggleCollapse={() => setSidebarCollapsed((v) => !v)}
        onEndEditing={() => void endEditing(true)}
        onSelectScript={selectScript}
        editSessionRef={editSessionHandle}
        isSystemAdmin={user?.is_system_admin ?? false}
      />

      <main className="main-area">
        <Topbar
          activePage={activePage}
          apiOnline={apiOnline}
          user={user}
          currentWorkspace={currentWorkspace!}
          workspaces={workspaces}
          workspaceMenuOpen={workspaceMenuOpen}
          onSetWorkspaceMenuOpen={setWorkspaceMenuOpen}
          onSetCurrentWorkspace={setCurrentWorkspace}
          onLogout={logout}
        />

        <Outlet />
      </main>

      <Toast toast={toast} />
    </div>
  );
}