import { readdirSync, readFileSync } from "node:fs";
import path from "node:path";
import { afterEach, describe, expect, it, vi } from "vitest";
import {
	createPiSession,
	type PiSession,
} from "../../../test/fixture/create-pi-session.ts";

const extensionPath = path.resolve(import.meta.dirname, "../index.ts");

describe("masks debug interface", () => {
	let session: PiSession | undefined;

	afterEach(async () => {
		await session?.dispose();
		session = undefined;
	});

	it("writes lifecycle records in the isolated sandbox", async () => {
		session = await createPiSession({
			env: { PI_MASKS_DEBUG: "1" },
			extensionPaths: [extensionPath],
		});
		await session.session.extensionRunner.emit({
			type: "session_start",
			reason: "startup",
		});
		await session.session.extensionRunner.emit({
			type: "session_shutdown",
			reason: "quit",
		});

		const stateHome = session.env["XDG_STATE_HOME"];
		if (!stateHome) throw new Error("missing sandbox state home");
		const directory = path.join(stateHome, "pi-ext", "debug", "masks");
		// Debug records flush asynchronously; poll until both events appear.
		const records = await vi.waitFor(
			() => {
				const parsed = readdirSync(directory).flatMap((file) =>
					readFileSync(path.join(directory, file), "utf8")
						.trim()
						.split("\n")
						.filter(Boolean)
						.map(
							(line) =>
								JSON.parse(line) as { event: string; extension: string },
						),
				);
				const events = parsed.map((record) => record.event);
				if (
					!events.includes("session.start") ||
					!events.includes("session.shutdown")
				)
					throw new Error("lifecycle events not flushed yet");
				return parsed;
			},
			{ timeout: 2_000, interval: 20 },
		);
		expect(records).toContainEqual(
			expect.objectContaining({ event: "session.start", extension: "masks" }),
		);
		expect(records).toContainEqual(
			expect.objectContaining({
				event: "session.shutdown",
				extension: "masks",
			}),
		);
	});
});