feat: add maintenance toggle command

tests/command/maintenance.test.ts

@@ -0,0 +1,64 @@
+import { describe, expect, spyOn, test } from "bun:test";
+import { runMaintenance } from "../../command/maintenance";
+import type { ApiRequestInit } from "../../lib/api";
+
+describe("maintenance command", () => {
+  test("first call reads status and asks for confirmation without mutation", async () => {
+    const calls: string[] = [];
+    const output = spyOn(console, "log").mockImplementation(() => {});
+    try {
+      await runMaintenance(
+        "a.example.com",
+        async <T>(path: string) => {
+          calls.push(path);
+          return { host: "a.example.com", enabled: false, hosts: [] } as T;
+        },
+        async () => false,
+      );
+      expect(calls).toEqual(["/maintenance/a.example.com"]);
+      expect(output).toHaveBeenCalledWith(
+        expect.stringContaining("currently \x1b[32mOFF\x1b[0m"),
+      );
+    } finally {
+      output.mockRestore();
+    }
+  });
+
+  test("confirmed call posts an idempotent desired state and prints result", async () => {
+    const calls: Array<{
+      path: string;
+      init?: { method?: string; json?: unknown };
+    }> = [];
+    const output = spyOn(console, "log").mockImplementation(() => {});
+    try {
+      await runMaintenance(
+        "a.example.com",
+        async <T>(path: string, init?: ApiRequestInit) => {
+          calls.push({ path, init });
+          return (
+            calls.length === 1
+              ? { host: "a.example.com", enabled: false, hosts: [] }
+              : {
+                  host: "a.example.com",
+                  enabled: true,
+                  hosts: ["a.example.com"],
+                }
+          ) as T;
+        },
+        async () => true,
+      );
+      expect(calls).toEqual([
+        { path: "/maintenance/a.example.com", init: undefined },
+        {
+          path: "/maintenance/a.example.com",
+          init: { method: "POST", json: { enabled: true } },
+        },
+      ]);
+      expect(output).toHaveBeenCalledWith(
+        "a.example.com maintenance is now \x1b[31mON\x1b[0m",
+      );
+    } finally {
+      output.mockRestore();
+    }
+  });
+});