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

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

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

	it("writes its lifecycle JSONL through the standalone factory", async () => {
		session = await createPiSession({
			extensionPaths: [fileURLToPath(new URL("../index.ts", import.meta.url))],
			env: { PI_COST_DEBUG: "1" },
		});
		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", "cost");

		let events: unknown[] = [];
		await vi.waitFor(() => {
			const [file] = readdirSync(directory);
			if (!file) throw new Error("no debug file yet");
			events = readFileSync(path.join(directory, file), "utf8")
				.trim()
				.split("\n")
				.map((line) => JSON.parse(line).event);
			expect(events).toEqual(
				expect.arrayContaining(["session.start", "session.shutdown"]),
			);
		});
		expect(events).toEqual(
			expect.arrayContaining(["session.start", "session.shutdown"]),
		);
	});
});