import { mkdtempSync, readdirSync, readFileSync, rmSync } from "node:fs";
import { tmpdir } from "node:os";
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";

const extensionPath = fileURLToPath(new URL("../index.ts", import.meta.url));
let root: string | undefined;
let session: PiSession | undefined;

afterEach(async () => {
	await session?.dispose();
	if (root) rmSync(root, { recursive: true, force: true });
	session = undefined;
	root = undefined;
});

describe("footer debug diagnostics", () => {
	it("writes its lifecycle records in the isolated sandbox", async () => {
		root = mkdtempSync(path.join(tmpdir(), "pi-ext-footer-debug-"));
		session = await createPiSession({
			cwd: root,
			env: { PI_FOOTER_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 directory = path.join(
			session.env["XDG_STATE_HOME"] ?? path.join(root, ".test-state"),
			"pi-ext",
			"debug",
			"footer",
		);
		const readRecords = () =>
			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 records = await vi.waitFor(() => {
			const current = readRecords();
			expect(current).toContainEqual(
				expect.objectContaining({
					event: "session.start",
					extension: "footer",
				}),
			);
			expect(current).toContainEqual(
				expect.objectContaining({
					event: "session.shutdown",
					extension: "footer",
				}),
			);
			return current;
		});

		expect(records).toContainEqual(
			expect.objectContaining({ event: "session.start", extension: "footer" }),
		);
		expect(records).toContainEqual(
			expect.objectContaining({
				event: "session.shutdown",
				extension: "footer",
			}),
		);
	});
});