feat: quick access panel for Mudfish Full VPN

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Panel.tsx

@@ -0,0 +1,163 @@
+import {
+  ButtonItem,
+  DropdownItem,
+  Field,
+  PanelSection,
+  PanelSectionRow,
+  ToggleField,
+} from "@decky/ui";
+import { useEffect, useRef, useState } from "react";
+import {
+  connect,
+  disconnect,
+  getState,
+  listNodes,
+  NodeInfo,
+  Phase,
+  setNode,
+  VpnState,
+} from "./backend";
+
+const PHASE_TEXT: Record<Phase, string> = {
+  off: "꺼짐",
+  connecting: "연결 중…",
+  on: "연결됨",
+  error: "오류",
+  missing: "미꾸라지 미설치",
+};
+
+const STATE_POLL_MS = 2000;
+const NODES_POLL_MS = 10000;
+
+function elapsed(since: number, nowMs: number): string {
+  const minutes = Math.floor((nowMs / 1000 - since) / 60);
+  if (minutes < 1) return "방금";
+  if (minutes < 60) return `${minutes}분째`;
+  return `${Math.floor(minutes / 60)}시간 ${minutes % 60}분째`;
+}
+
+function rttText(rtt: number | null): string {
+  return rtt === null ? "측정 안 됨" : `${Math.round(rtt)}ms`;
+}
+
+function nodeLine(state: VpnState): string {
+  const node = state.node;
+  if (!node) return "핑 측정 중…";
+  const body = node.rtt === null ? node.label : `${node.label} (${Math.round(node.rtt)}ms)`;
+  return state.node_mode === "auto" ? `자동 · ${body}` : body;
+}
+
+function StatusValue({ state }: { state: VpnState }) {
+  if (state.phase !== "on") return <span>{PHASE_TEXT[state.phase]}</span>;
+  const jp = state.country === "JP";
+  const flag = jp ? "🇯🇵 JP" : state.country ?? "?";
+  const since = state.connected_since ? ` · ${elapsed(state.connected_since, Date.now())}` : "";
+  return (
+    <span style={{ color: jp ? undefined : "#ff6b6b" }}>
+      {`${PHASE_TEXT.on} · ${flag}${state.ip ? ` · ${state.ip}` : ""}${since}`}
+    </span>
+  );
+}
+
+export function Panel() {
+  const [state, setState] = useState<VpnState | null>(null);
+  const [busy, setBusy] = useState(false);
+  const [advanced, setAdvanced] = useState(false);
+  const [nodes, setNodes] = useState<NodeInfo[]>([]);
+  const polling = useRef(false);
+
+  const refresh = async () => {
+    if (polling.current) return;
+    polling.current = true;
+    try {
+      setState(await getState());
+    } finally {
+      polling.current = false;
+    }
+  };
+
+  useEffect(() => {
+    refresh();
+    const id = setInterval(refresh, STATE_POLL_MS);
+    return () => clearInterval(id);
+  }, []);
+
+  useEffect(() => {
+    if (!advanced) return;
+    const load = async () => setNodes(await listNodes());
+    load();
+    const id = setInterval(load, NODES_POLL_MS);
+    return () => clearInterval(id);
+  }, [advanced]);
+
+  const run = async (action: () => Promise<VpnState>, pending?: Phase) => {
+    setBusy(true);
+    if (pending && state) setState({ ...state, phase: pending, message: null });
+    try {
+      setState(await action());
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  if (!state) {
+    return (
+      <PanelSection>
+        <PanelSectionRow>
+          <Field label="상태">불러오는 중…</Field>
+        </PanelSectionRow>
+      </PanelSection>
+    );
+  }
+
+  const active = state.phase === "on" || state.phase === "connecting";
+  const options = [
+    { data: "auto", label: "자동 (핑 최저)" },
+    ...nodes.map((n) => ({ data: String(n.sid), label: `${n.label} · ${rttText(n.rtt)}` })),
+  ];
+  const selected = state.node_mode === "auto" ? "auto" : String(state.node?.sid ?? "auto");
+
+  return (
+    <PanelSection>
+      <PanelSectionRow>
+        <Field label="상태" focusable={false}>
+          <StatusValue state={state} />
+        </Field>
+      </PanelSectionRow>
+      <PanelSectionRow>
+        <ToggleField
+          label="미꾸라지 Full VPN"
+          checked={active}
+          disabled={busy || state.phase === "connecting" || state.phase === "missing"}
+          onChange={(on) => run(on ? connect : disconnect, on ? "connecting" : undefined)}
+        />
+      </PanelSectionRow>
+      <PanelSectionRow>
+        <Field label="노드" focusable={false}>
+          {nodeLine(state)}
+        </Field>
+      </PanelSectionRow>
+      {state.message && (
+        <PanelSectionRow>
+          <Field focusable={false} description={state.message} />
+        </PanelSectionRow>
+      )}
+      <PanelSectionRow>
+        <ButtonItem layout="below" onClick={() => setAdvanced(!advanced)}>
+          {advanced ? "고급 ▾" : "고급 ▸"}
+        </ButtonItem>
+      </PanelSectionRow>
+      {advanced && (
+        <PanelSectionRow>
+          <DropdownItem
+            label="일본 노드"
+            rgOptions={options}
+            selectedOption={selected}
+            disabled={busy || state.phase === "connecting"}
+            onChange={(opt) => run(() => setNode(String(opt.data)))}
+          />
+        </PanelSectionRow>
+      )}
+    </PanelSection>
+  );
+}