import { useCallback, useEffect, useState } from "react";
import {
  Badge,
  Banner,
  Button,
  Input,
  LocaleProvider,
  Spin,
  SideSheet,
  Toast,
  Tooltip,
} from "@douyinfe/semi-ui-19";
import zhCN from "@douyinfe/semi-ui-19/lib/es/locale/source/zh_CN";
import {
  IconSetting,
  IconAIFilledLevel3,
  IconHistory,
} from "@douyinfe/semi-icons";
import { QuantFlowPage } from "./research/QuantFlowPage";
import { PipelinePage } from "./research/PipelinePage";
import { FeaturesPage } from "./research/FeaturesPage";
import { ResearchWorkspace } from "./research/ResearchWorkspace";
import { OperatorsPage } from "./research/OperatorsPage";
import { AppSidebar } from "./components/AppSidebar";
import "./components/sidebar.css";
import { api, patch, post } from "./api";
import type { Account, Job } from "./types";
import { MCPKeysPage } from "./pages/MCPKeysPage";
import { AccountPage } from "./pages/AccountPage";
import { DatasetPage } from "./pages/DatasetPage";
import { AlphaPage } from "./pages/AlphaPage";
import { HomePage } from "./pages/HomePage";
import { JobPanel } from "./components/JobPanel";
import { BacktestPage } from "./backtests/BacktestPage";
import { WorkspacePreferences } from "./components/WorkspacePreferences";
import { ModelSettingsPanel } from "./ai/ModelSettingsPanel";
import { ChatPanel } from "./ai/ChatPanel";
import { actionDestination, pageFromHash } from "./ai/workspace";
import type { WorkspacePage } from "./ai/workspace";
import type { PageContext, Resource, UIAction } from "./ai/types";

export default function App() {
  const [authenticated, setAuthenticated] = useState<boolean | null>(null);
  const [account, setAccount] = useState<Account | null>(null);
  const [sidebarCollapsed, setSidebarCollapsed] = useState(false);
  const [jobs, setJobs] = useState<Job[]>([]);
  const [page, setPage] = useState<WorkspacePage>(() =>
    pageFromHash(location.hash),
  );
  const [visitedBacktests, setVisitedBacktests] = useState(
    page === "backtests",
  );
  useEffect(() => {
    if (page === "backtests") setVisitedBacktests(true);
  }, [page]);
  const [visitedResearch, setVisitedResearch] = useState<string[]>([]);
  const [researchContext, setResearchContext] = useState<PageContext>({
    page: "templates",
  });
  useEffect(() => {
    if (
      [
        "operators",
        "templates",
        "variants",
        "features",
        "pipeline",
        "quantflow",
      ].includes(page)
    )
      setVisitedResearch((old) => (old.includes(page) ? old : [...old, page]));
  }, [page]);
  const [catalogModal, setCatalogModal] = useState(false);
  const [showJobs, setShowJobs] = useState(false);
  const [settingsOpen, setSettingsOpen] = useState(false);
  const openSettings = () => {
    setShowJobs(false);
    setChatOpen(false);
    setSettingsOpen(true);
  };
  const [refreshKey, setRefreshKey] = useState(0);
  const [resourceVersions, setResourceVersions] = useState<
    Record<Resource, number>
  >({
    alphas: 0,
    datasets: 0,
    backtests: 0,
    jobs: 0,
    account: 0,
  });
  const [pollError, setPollError] = useState("");
  const [chatOpen, setChatOpen] = useState(false);
  const [chatWidth, setChatWidth] = useState(420);
  const [viewport, setViewport] = useState(window.innerWidth);
  const [alphaContext, setAlphaContext] = useState<PageContext>({
    page: "alphas",
  });
  const [backtestContext, setBacktestContext] = useState<PageContext>({
    page: "backtests",
  });
  const [datasetContext, setDatasetContext] = useState<PageContext>({
    page: "datasets",
  });
  const [aiAction, setAIAction] = useState<UIAction | null>(null);
  const chatOffset = viewport >= 1440 && chatOpen ? chatWidth : 0;
  const focusBusiness = useCallback(() => {
    if (window.innerWidth < 1440) setChatOpen(false);
  }, []);
  useEffect(() => {
    const resize = () => setViewport(window.innerWidth);
    window.addEventListener("resize", resize);
    return () => window.removeEventListener("resize", resize);
  }, []);
  useEffect(() => {
    document.documentElement.style.setProperty(
      "--chat-space",
      `${chatOffset}px`,
    );
    document.documentElement.style.setProperty(
      "--chat-width",
      `${chatWidth}px`,
    );
    return () => {
      document.documentElement.style.setProperty("--chat-space", "0px");
    };
  }, [chatOffset, chatWidth]);
  const refresh = useCallback(async () => {
    try {
      const [nextAccount, nextJobs] = await Promise.all([
        api<Account>("/account"),
        api<Job[]>("/sync-jobs"),
      ]);
      setAccount(nextAccount);
      setJobs(nextJobs);
      setPollError("");
    } catch (error) {
      setPollError((error as Error).message);
    }
  }, []);

  useEffect(() => {
    api("/auth/me")
      .then(() => setAuthenticated(true))
      .catch(() => setAuthenticated(false));
    const expired = () => {
      setSettingsOpen(false);
      setAuthenticated(false);
      setAccount(null);
      setJobs([]);
      setChatOpen(false);
      setShowJobs(false);
    };
    window.addEventListener("session-expired", expired);
    const hash = () => setPage(pageFromHash(location.hash));
    window.addEventListener("hashchange", hash);
    return () => {
      window.removeEventListener("session-expired", expired);
      window.removeEventListener("hashchange", hash);
    };
  }, []);
  useEffect(() => {
    if (!authenticated) return;
    void refresh();
    const timer = window.setInterval(() => void refresh(), 3000);
    return () => clearInterval(timer);
  }, [authenticated, refresh]);
  useEffect(() => {
    document.body.setAttribute("theme-mode", account?.theme ?? "light");
  }, [account?.theme]);

  const completedVersion = jobs
    .filter(
      (j) => j.status === "completed" || j.status === "completed_with_errors",
    )
    .map((j) => `${j.id}:${j.updated_at}`)
    .join("|");
  const pending = jobs.filter((j) =>
    ["queued", "running", "waiting_auth", "waiting_connection"].includes(
      j.status,
    ),
  ).length;
  const actionDone = () => {
    void refresh();
    setRefreshKey((k) => k + 1);
  };
  const aiChanged = (resources: Resource[]) => {
    if (resources.includes("jobs") || resources.includes("account"))
      void refresh();
    setResourceVersions((old) => {
      const next = { ...old };
      for (const resource of resources)
        if (Object.hasOwn(next, resource)) next[resource] += 1;
      return next;
    });
  };
  const taskCreated = () => {
    actionDone();
    setShowJobs(true);
  };
  const changePage = (next: WorkspacePage) => {
    location.hash = next;
    setPage(next);
  };
  const handleAction = (action: UIAction) => {
    const destination = actionDestination(action);
    if (!destination) return;
    if (destination.chat === "open") setChatOpen(true);
    else if (destination.chat === "close") setChatOpen(false);
    else focusBusiness();
    if (destination.page) changePage(destination.page);
    setAIAction(action);
  };
  const logout = async () => {
    try {
      await post("/auth/logout");
      setSettingsOpen(false);
      setAuthenticated(false);
      setChatOpen(false);
      setShowJobs(false);
      setAccount(null);
      setJobs([]);
      setAIAction(null);
      setAlphaContext({ page: "alphas" });
      setDatasetContext({ page: "datasets" });
      setBacktestContext({ page: "backtests" });
    } catch (e) {
      Toast.error((e as Error).message);
    }
  };

  return (
    <LocaleProvider locale={zhCN}>
      {authenticated === null ? (
        <div className="screen-center">
          <Spin size="large" />
        </div>
      ) : !authenticated ? (
        <Login
          onLogin={() => {
            setAuthenticated(true);
            void refresh();
          }}
        />
      ) : (
        <div
          className={`workspace ${sidebarCollapsed ? "sidebar-collapsed" : ""}`}
        >
          <AppSidebar
            account={account}
            page={page}
            collapsed={sidebarCollapsed}
            blocked={
              (chatOpen && viewport < 1440) || catalogModal || settingsOpen
            }
            onCollapse={() => setSidebarCollapsed((value) => !value)}
            onNavigate={changePage}
            onLogout={() => void logout()}
            onTheme={() => {
              if (!account) return;
              void patch("/account/preferences", {
                display_name: account.display_name,
                timezone: account.timezone,
                page_size: account.page_size,
                theme: account.theme === "dark" ? "light" : "dark",
              })
                .then(() => refresh())
                .catch((error: Error) => Toast.error(error.message));
            }}
          />
          <div
            className="workspace-tools"
            hidden={settingsOpen || (chatOpen && viewport < 1440)}
            inert={
              (chatOpen && viewport < 1440) || catalogModal || settingsOpen
            }
            role="toolbar"
            aria-label="工作空间工具"
          >
            <Tooltip content="配置" visible={settingsOpen ? false : undefined}>
              <Button
                aria-label="配置"
                icon={<IconSetting aria-hidden="true" />}
                type="tertiary"
                theme="borderless"
                onClick={openSettings}
              />
            </Tooltip>
            <Tooltip
              content="AI 研究助手"
              visible={chatOpen ? false : undefined}
            >
              <Button
                aria-label="切换研究助手"
                aria-expanded={chatOpen}
                aria-controls="research-assistant"
                icon={<IconAIFilledLevel3 aria-hidden="true" />}
                colorful
                type="tertiary"
                theme={chatOpen ? "light" : "borderless"}
                onClick={() => setChatOpen(!chatOpen)}
              />
            </Tooltip>
            <Tooltip content="同步任务" visible={showJobs ? false : undefined}>
              <Badge count={pending || undefined}>
                <Button
                  aria-label="同步任务"
                  icon={<IconHistory aria-hidden="true" />}
                  type="tertiary"
                  theme="borderless"
                  onClick={() => {
                    focusBusiness();
                    setShowJobs(true);
                  }}
                />
              </Badge>
            </Tooltip>
          </div>
          <div
            className="main-shell"
            inert={
              (chatOpen && viewport < 1440) || catalogModal || settingsOpen
            }
            aria-hidden={catalogModal || undefined}
          >
            <main
              className={`page-content ${page !== "account" ? "bounded-page" : "account-page"}`}
            >
              {page === "home" && (
                <HomePage
                  account={account}
                  onAccount={() => changePage("account")}
                />
              )}
              {page === "mcp-keys" && <MCPKeysPage />}
              {pollError && (
                <Banner
                  type="warning"
                  description={`后台状态暂时不可用：${pollError}`}
                />
              )}
              <div hidden={page !== "account"}>
                <AccountPage
                  account={account}
                  onChange={actionDone}
                  onTask={taskCreated}
                />
              </div>
              <div className="alpha-page-view" hidden={page !== "datasets"}>
                <DatasetPage
                  onContext={setDatasetContext}
                  action={aiAction}
                  account={account}
                  jobs={jobs}
                  active={page === "datasets"}
                  version={`${refreshKey}:${resourceVersions.datasets}:${completedVersion}`}
                  suspended={showJobs || chatOpen}
                  onTask={taskCreated}
                  onModal={setCatalogModal}
                  onChat={() => setChatOpen(true)}
                />
              </div>
              <div className="alpha-page-view" hidden={page !== "alphas"}>
                <AlphaPage
                  onAction={handleAction}
                  taskPanelOpen={showJobs}
                  account={account}
                  version={`${refreshKey}:${resourceVersions.alphas}:${completedVersion}`}
                  onTask={taskCreated}
                  onAccount={() => changePage("account")}
                  active={page === "alphas"}
                  overlaySuspended={
                    page !== "alphas" || (viewport < 1440 && chatOpen)
                  }
                  chatOffset={chatOffset}
                  onContext={setAlphaContext}
                  action={
                    aiAction?.type === "open_alpha" ||
                    aiAction?.type === "apply_filters"
                      ? aiAction
                      : null
                  }
                  onOverlay={focusBusiness}
                />
              </div>
              <div className="backtest-page-view" hidden={page !== "backtests"}>
                {visitedBacktests && (
                  <BacktestPage
                    version={resourceVersions.backtests}
                    active={page === "backtests"}
                    suspended={showJobs || (viewport < 1440 && chatOpen)}
                    chatOffset={chatOffset}
                    timezone={account?.timezone}
                    action={aiAction}
                    onContext={setBacktestContext}
                    onAction={handleAction}
                  />
                )}
              </div>
              {visitedResearch.includes("quantflow") && (
                <div className="alpha-page-view" hidden={page !== "quantflow"}>
                  <QuantFlowPage
                    active={page === "quantflow"}
                    onAction={handleAction}
                    onContext={setResearchContext}
                  />
                </div>
              )}
              {visitedResearch.includes("pipeline") && (
                <div className="alpha-page-view" hidden={page !== "pipeline"}>
                  <PipelinePage
                    active={page === "pipeline"}
                    onAction={handleAction}
                    onContext={setResearchContext}
                  />
                </div>
              )}
              {visitedResearch.includes("features") && (
                <div className="alpha-page-view" hidden={page !== "features"}>
                  <FeaturesPage
                    action={aiAction}
                    active={page === "features"}
                    onAction={handleAction}
                    onContext={setResearchContext}
                  />
                </div>
              )}
              {visitedResearch.includes("operators") && (
                <div className="alpha-page-view" hidden={page !== "operators"}>
                  <OperatorsPage active={page === "operators"} />
                </div>
              )}
              {(["templates", "variants"] as const).map(
                (researchPage) =>
                  visitedResearch.includes(researchPage) && (
                    <div
                      className="alpha-page-view"
                      key={researchPage}
                      hidden={page !== researchPage}
                    >
                      <ResearchWorkspace
                        page={researchPage}
                        active={page === researchPage}
                        action={aiAction}
                        onAction={handleAction}
                        onContext={setResearchContext}
                      />
                    </div>
                  ),
              )}
            </main>
          </div>
          <SideSheet
            title="配置"
            className="settings-drawer"
            placement="right"
            visible={settingsOpen}
            width={Math.min(560, viewport)}
            keepDOM
            closeOnEsc
            onCancel={() => setSettingsOpen(false)}
          >
            <ModelSettingsPanel />
            <WorkspacePreferences account={account} onChange={actionDone} />
          </SideSheet>
          <JobPanel
            visible={showJobs && !(viewport < 1440 && chatOpen)}
            chatOffset={chatOffset}
            jobs={jobs}
            timezone={account?.timezone}
            onClose={() => setShowJobs(false)}
            onChange={actionDone}
            onAccount={() => {
              setShowJobs(false);
              changePage("account");
            }}
          />
          {chatOpen && viewport < 1440 && (
            <div
              className="ai-mask"
              aria-hidden="true"
              onClick={() => setChatOpen(false)}
            />
          )}
          <div inert={catalogModal && !chatOpen}>
            <ChatPanel
              action={aiAction}
              jobs={jobs}
              open={chatOpen}
              width={chatWidth}
              onWidth={setChatWidth}
              onClose={() => setChatOpen(false)}
              context={
                {
                  home: { page: "home" as const },
                  quantflow:
                    researchContext.page === "quantflow"
                      ? researchContext
                      : { page: "quantflow" as const },
                  pipeline:
                    researchContext.page === "pipeline"
                      ? researchContext
                      : { page: "pipeline" as const },
                  features:
                    researchContext.page === "features"
                      ? researchContext
                      : { page: "features" as const },
                  operators: { page: "operators" as const },
                  templates:
                    researchContext.page === "templates"
                      ? researchContext
                      : { page: "templates" as const },
                  variants:
                    researchContext.page === "variants"
                      ? researchContext
                      : { page: "variants" as const },
                  alphas: alphaContext,
                  datasets: datasetContext,
                  backtests: backtestContext,
                  account: { page: "account" as const },
                  "mcp-keys": { page: "account" as const },
                }[page]
              }
              timezone={account?.timezone}
              onSettings={openSettings}
              onChanged={aiChanged}
              onAction={handleAction}
            />
          </div>
        </div>
      )}
    </LocaleProvider>
  );
}

function Login({ onLogin }: { onLogin: () => void }) {
  const [username, setUsername] = useState("admin");
  const [password, setPassword] = useState("");
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState("");
  async function submit(event: React.FormEvent) {
    event.preventDefault();
    setBusy(true);
    setError("");
    try {
      await post("/auth/login", { username, password });
      setPassword("");
      onLogin();
    } catch (e) {
      setError((e as Error).message);
    } finally {
      setBusy(false);
    }
  }
  return (
    <div className="login-page">
      <section className="login-form-shell">
        <form className="login-form" onSubmit={submit}>
          <div className="login-brand">Alpha 研究</div>
          <h2>登录研究工作空间</h2>
          <p>使用部署时设置的系统账户登录。</p>
          {error && <Banner type="danger" description={error} />}
          <label>
            用户名
            <Input
              aria-label="用户名"
              value={username}
              onChange={setUsername}
              autoComplete="username"
              size="large"
            />
          </label>
          <label>
            密码
            <Input
              aria-label="密码"
              mode="password"
              value={password}
              onChange={setPassword}
              autoComplete="current-password"
              size="large"
            />
          </label>
          <Button
            htmlType="submit"
            theme="solid"
            size="large"
            block
            loading={busy}
          >
            进入工作空间
          </Button>
          <div className="login-note">WorldQuant 账户在登录后单独连接。</div>
        </form>
      </section>
    </div>
  );
}