import { describe, expect, it, spyOn } from "bun:test";
import { Command, type CommandEntry, Flags, run } from "@oh-my-pi/pi-utils/cli";

class GoodCommand extends Command {
	static description = "prints good things";
	static flags = {
		verbose: Flags.boolean({ description: "be loud" }),
	};
	async run(): Promise<void> {}
}

describe("run() per-command help", () => {
	// Contract: `omp <cmd> --help` must load only the requested command module.
	// Loading the whole table would let any unrelated command whose import
	// hangs or crashes take down every per-command help invocation.
	it("loads only the requested command", async () => {
		let brokenLoads = 0;
		const commands: CommandEntry[] = [
			{ name: "good", load: async () => GoodCommand },
			{
				name: "broken",
				load: async () => {
					brokenLoads++;
					throw new Error("import-time crash");
				},
			},
		];
		const writes: string[] = [];
		const stdoutSpy = spyOn(process.stdout, "write").mockImplementation(chunk => {
			writes.push(String(chunk));
			return true;
		});
		try {
			await run({ bin: "omp", version: "0.0.0", argv: ["good", "--help"], commands });
		} finally {
			stdoutSpy.mockRestore();
		}
		expect(brokenLoads).toBe(0);
		expect(writes.join("")).toContain("prints good things");
		expect(writes.join("")).toContain("--verbose");
	});
});