import { readdirSync, readFileSync } from "node:fs";
import path from "node:path";
import { afterEach, describe, expect, it } from "vitest";
import { createTestSession, type TestSession } from "../../../test/harness";
import usageExtension from "../index";

describe("usage pi-test-harness", () => {
	let t: TestSession | undefined;

	afterEach(() => {
		t?.dispose();
		t = undefined;
	});

	it("loads in real Pi extension runtime", async () => {
		t = await createTestSession({ extensionFactories: [usageExtension] });

		expect(t.session.extensionRunner.extensions).toHaveLength(1);
	});

	it("writes debug lifecycle records in its sandbox when enabled", async () => {
		const extensionPath = path.resolve(import.meta.dirname, "../index.ts");
		t = await createTestSession({
			env: { PI_USAGE_DEBUG: "1" },
			extensions: [extensionPath],
		});
		const extension = t.session.extensionRunner.extensions[0];
		const context = t.session.extensionRunner.createCommandContext();
		for (const handler of extension.handlers.get("session_start"))
			await handler({ type: "session_start" }, context);
		for (const handler of extension.handlers.get("session_shutdown"))
			await handler({ type: "session_shutdown" }, context);
		const directory = path.join(
			t.cwd,
			".test-state",
			"pi-ext",
			"debug",
			"usage",
		);
		const records = readFileSync(
			path.join(directory, readdirSync(directory)[0]),
			"utf8",
		)
			.trim()
			.split("\n")
			.map((line) => JSON.parse(line));
		expect(records.map((record) => record.event)).toEqual(
			expect.arrayContaining(["session.start", "session.shutdown"]),
		);
	});

	it("loads the dashboard implementation on first command use", async () => {
		t = await createTestSession({ extensionFactories: [usageExtension] });
		const command =
			t.session.extensionRunner.extensions[0].commands.get("usage");

		await expect(command.handler("", { hasUI: false } as never)).resolves.toBe(
			undefined,
		);
	});
});