"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import clsx from "clsx";

type SessionSummary = {
  sessionId: string;
  account: string;
  role: string;
  displayName: string;
  loginMethod: string;
  createdAt: string;
  expiresAt: string;
  lastSeenAt: string;
  current: boolean;
};

function formatTime(value: string) {
  return new Date(value).toLocaleString("zh-CN", { hour12: false });
}

export function SessionManagementClient({ initialSessions }: { initialSessions: SessionSummary[] }) {
  const router = useRouter();
  const [sessions, setSessions] = useState(initialSessions);
  const [busySessionId, setBusySessionId] = useState("");
  const [message, setMessage] = useState("");

  async function refresh() {
    const response = await fetch("/api/v1/auth/sessions", { cache: "no-store" });
    const result = (await response.json()) as { ok: boolean; sessions?: SessionSummary[]; message?: string };
    if (!response.ok || !result.ok) {
      throw new Error(result.message ?? "刷新失败");
    }
    setSessions(result.sessions ?? []);
  }

  async function revoke(sessionId: string, current: boolean) {
    setBusySessionId(sessionId);
    setMessage("");
    try {
      const response = await fetch("/api/v1/auth/sessions", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ action: "revoke_session", sessionId }),
      });
      const result = (await response.json()) as { ok: boolean; message?: string };
      if (!response.ok || !result.ok) {
        throw new Error(result.message ?? "撤销失败");
      }
      if (current) {
        router.replace("/auth/login");
        router.refresh();
        return;
      }
      await refresh();
      setMessage("会话已撤销。");
    } catch (error) {
      setMessage(error instanceof Error ? error.message : "撤销失败");
    } finally {
      setBusySessionId("");
    }
  }

  return (
    <section className="rounded-2xl border border-[#E5E5EA] bg-white px-4 py-4">
      <div className="text-[16px] font-semibold text-[#111111]">登录会话</div>
      <div className="mt-1 text-[12px] leading-5 text-[#8C8C8C]">
        管理当前账号的登录端；最高管理员可看到所有账号的会话。
      </div>
      <div className="mt-4 space-y-3">
        {sessions.length === 0 ? (
          <div className="rounded-2xl bg-[#F7F8FA] px-4 py-3 text-[13px] text-[#8C8C8C]">
            暂无可管理会话。
          </div>
        ) : (
          sessions.map((session) => (
            <div key={session.sessionId} className="rounded-2xl bg-[#F7F8FA] px-4 py-3">
              <div className="flex items-start justify-between gap-3">
                <div className="min-w-0">
                  <div className="flex items-center gap-2">
                    <div className="truncate text-[14px] font-semibold text-[#111111]">
                      {session.displayName || session.account}
                    </div>
                    {session.current ? (
                      <span className="rounded-full bg-[#DFF4E8] px-2 py-0.5 text-[10px] font-semibold text-[#215B39]">
                        当前
                      </span>
                    ) : null}
                  </div>
                  <div className="mt-1 text-[12px] leading-5 text-[#57606A]">
                    {session.account} · {session.loginMethod === "code" ? "验证码" : "账号密码"}
                    <br />
                    最近活跃：{formatTime(session.lastSeenAt)}
                    <br />
                    到期：{formatTime(session.expiresAt)}
                  </div>
                </div>
                <button
                  type="button"
                  onClick={() => void revoke(session.sessionId, session.current)}
                  disabled={busySessionId === session.sessionId}
                  className={clsx(
                    "shrink-0 rounded-full px-3 py-2 text-[12px] font-semibold",
                    session.current ? "bg-[#FF3B30] text-white" : "bg-white text-[#FF3B30]",
                  )}
                >
                  {busySessionId === session.sessionId ? "处理中" : "撤销"}
                </button>
              </div>
            </div>
          ))
        )}
      </div>
      {message ? <div className="mt-3 text-[12px] text-[#57606A]">{message}</div> : null}
    </section>
  );
}