"use client";

import { useEffect, useState } from "react";
import { useSearchParams } from "next/navigation";
import { AppLayout } from "@/components/layout/app-layout";
import { QuoteRouteHub } from "@/components/embed/quote-route-hub";
import { EmbedDemoLogin } from "@/components/embed/embed-demo-login";
import { Card } from "@/components/ui/card";
import { SecondaryButton } from "@/components/ui/primary-button";
import { Skeleton } from "@/components/ui/skeleton";
import { ErrorBanner } from "@/components/ui/error-banner";
import {
  isEmbedHostedShell,
  parseEmbedSsoParams,
  stripEmbedSsoQueryFromUrl,
} from "@/lib/embed/sso-params";
import {
  embedDemoLogin,
  embedDemoLoginWithKey,
  embedDemoLogout,
  embedDemoMe,
  type EmbedDemoSession,
} from "@/lib/frontend/api-client";

export function EmbedDemoClient() {
  const searchParams = useSearchParams();
  const [booting, setBooting] = useState(true);
  const [session, setSession] = useState<EmbedDemoSession | null>(null);
  const [bootError, setBootError] = useState<string | null>(null);
  const [hostedShell, setHostedShell] = useState(false);

  useEffect(() => {
    let cancelled = false;

    void (async () => {
      const params = new URLSearchParams(searchParams.toString());
      const sso = parseEmbedSsoParams(params);
      const hosted = isEmbedHostedShell(params);
      if (!cancelled) setHostedShell(hosted);

      // 宿主直传凭证：自动登录，跳过登录页（勿先 logout）
      if (sso.mode === "api_key") {
        const res = await embedDemoLoginWithKey("", sso.apiKey);
        if (cancelled) return;
        if (res.code === 0) {
          stripEmbedSsoQueryFromUrl();
          setSession(res.data);
          setBootError(null);
          setBooting(false);
          return;
        }
        setBootError(res.message || "API Key 无效，无法自动登录");
        setBooting(false);
        return;
      }

      if (sso.mode === "password") {
        const res = await embedDemoLogin("", sso.customerId, sso.password);
        if (cancelled) return;
        if (res.code === 0) {
          stripEmbedSsoQueryFromUrl();
          setSession(res.data);
          setBootError(null);
          setBooting(false);
          return;
        }
        setBootError(res.message || "客户编号或密码错误，无法自动登录");
        setBooting(false);
        return;
      }

      // 无 SSO：尝试恢复已有 cookie 会话（刷新不掉登录）
      const me = await embedDemoMe("");
      if (cancelled) return;
      if (me.code === 0) {
        setSession(me.data);
        setBootError(null);
        setBooting(false);
        return;
      }

      setSession(null);
      setBooting(false);
    })();

    return () => {
      cancelled = true;
    };
  }, [searchParams]);

  const isKeyLogin = session?.login_type === "api_key";

  const handleLogout = async () => {
    await embedDemoLogout("");
    setSession(null);
    setBootError(null);
    setHostedShell(false);
  };

  if (booting) {
    return (
      <AppLayout title="宿主嵌入演示">
        <Skeleton className="h-64 w-full" />
      </AppLayout>
    );
  }

  if (!session) {
    return (
      <AppLayout title="宿主嵌入演示">
        {bootError ? (
          <div className="mb-4">
            <ErrorBanner>{bootError}</ErrorBanner>
          </div>
        ) : null}
        <EmbedDemoLogin
          onSuccess={(data) => {
            setSession(data);
            setBootError(null);
          }}
        />
      </AppLayout>
    );
  }

  return (
    <AppLayout title="宿主嵌入演示">
      <Card className="mb-4 flex flex-wrap items-center justify-between gap-3">
        <div>
          <p className="text-sm text-text-secondary">
            当前登录客户 · {isKeyLogin ? "API Key 登录" : "账号密码登录"}
            {hostedShell ? " · 宿主直连" : ""}
          </p>
          <p className="text-lg font-semibold">{session.customer_id}</p>
          <p className="mt-1 text-xs text-text-secondary">
            请选择 MotherShip 或 Flock Freight 模块开始查价
          </p>
        </div>
        {!hostedShell ? (
          <SecondaryButton onClick={() => void handleLogout()}>
            退出登录
          </SecondaryButton>
        ) : null}
      </Card>

      <QuoteRouteHub customerId={session.customer_id} apiBaseUrl="" />
    </AppLayout>
  );
}