"use client";

import { useEffect, useState } from "react";
import { useRouter } from "next/navigation";
import { Monitor, Smartphone, Tablet } from "lucide-react";
import ConfirmDialog from "@/components/ConfirmDialog";
import { apiRevokeLoginDevice, type LoginDevice } from "@/lib/api";
import { formatDateTime } from "@/lib/format";

function DeviceIcon({ kind }: { kind: LoginDevice["device_kind"] }) {
  const props = { size: 20, strokeWidth: 1.75, "aria-hidden": true as const };
  if (kind === "mobile") return <Smartphone {...props} />;
  if (kind === "tablet") return <Tablet {...props} />;
  return <Monitor {...props} />;
}

/**
 * 安全设置：仍有效的登录会话。
 * 本机标「当前在线」；其它设备可剔除，对方需重新输入密码登录。
 */
export default function LoginDevices({ devices: initial }: { devices: LoginDevice[] }) {
  const router = useRouter();
  const [devices, setDevices] = useState(initial);
  const [target, setTarget] = useState<LoginDevice | null>(null);
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState("");

  useEffect(() => {
    setDevices(initial);
  }, [initial]);

  async function confirmKick() {
    if (!target) return;
    setBusy(true);
    setError("");
    try {
      const res = await apiRevokeLoginDevice(target.id);
      if (res.error) {
        setError(res.error);
        return;
      }
      setDevices((prev) => prev.filter((d) => d.id !== target.id));
      setTarget(null);
      router.refresh();
    } catch {
      setError("网络异常，请稍后重试");
    } finally {
      setBusy(false);
    }
  }

  return (
    <div className="mt-8">
      <div className="mb-4">
        <h2 className="text-[18px] font-extrabold tracking-tight" style={{ color: "var(--ink)" }}>
          最近登录的设备
        </h2>
        <p className="meta mt-1 text-[13px]">
          下列为仍有效的登录会话。若出现无法识别的设备，请立即剔除或修改密码
        </p>
      </div>
      <div className="panel overflow-hidden">
        {devices.length === 0 ? (
          <div className="px-5 py-12 text-center">
            <Monitor size={22} className="mx-auto mb-2" style={{ color: "var(--ink-3)" }} />
            <p className="meta text-[12.5px]">暂无登录记录</p>
          </div>
        ) : (
          <ul>
            {devices.map((d, i) => {
              const ip = d.ip || "未知 IP";
              return (
                <li
                  key={d.id}
                  className="flex items-start gap-3 px-4 sm:px-5 py-3.5"
                  style={{ borderTop: i === 0 ? undefined : "1px solid var(--line)" }}
                >
                  <span
                    className="mt-0.5 w-9 h-9 rounded-lg flex items-center justify-center shrink-0"
                    style={{ background: "var(--tint)", color: "var(--ink-2)" }}
                    aria-hidden
                  >
                    <DeviceIcon kind={d.device_kind} />
                  </span>
                  <div className="min-w-0 flex-1">
                    <p className="text-[13.5px] font-semibold leading-snug truncate" style={{ color: "var(--ink)" }}>
                      {d.device_label}
                    </p>
                    <p className="meta text-[12px] mt-0.5 truncate tabular-nums">
                      IP {ip} · {d.browser}
                    </p>
                  </div>
                  <div className="shrink-0 text-right pl-2">
                    <p className="text-[12px] tabular-nums leading-snug" style={{ color: "var(--ink-3)" }}>
                      {formatDateTime(d.created_at)}
                    </p>
                    {d.current ? (
                      <p className="mt-1 text-[12px] font-semibold" style={{ color: "var(--ok)" }}>
                        当前在线
                      </p>
                    ) : (
                      <button
                        type="button"
                        className="mt-1 text-[12px] font-semibold hover:underline"
                        style={{ color: "var(--danger)" }}
                        onClick={() => {
                          setError("");
                          setTarget(d);
                        }}
                      >
                        剔除
                      </button>
                    )}
                  </div>
                </li>
              );
            })}
          </ul>
        )}
      </div>

      <ConfirmDialog
        open={!!target}
        title="剔除这台设备？"
        message={
          error
            ? `剔除失败：${error}`
            : "剔除后，该设备上的登录会立即失效，需要重新输入密码才能登录。"
        }
        confirmLabel="确认剔除"
        danger
        busy={busy}
        onConfirm={() => void confirmKick()}
        onCancel={() => {
          if (!busy) {
            setTarget(null);
            setError("");
          }
        }}
      />
    </div>
  );
}