import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import path from "node:path";
import { afterEach, describe, expect, it, vi } from "vitest";
import { createTestSession, type TestSession } from "../../../test/harness";

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

type Case = { user?: unknown; project?: unknown };

const mask = (name: string, shortcut: string) => ({
	name,
	model: "openai/gpt-4o",
	thinkingLevel: "low",
	shortcut,
});

describe("masks settings resolution", () => {
	let t: TestSession | undefined;
	let root: string | undefined;
	afterEach(() => {
		vi.restoreAllMocks();
		t?.dispose();
		t = undefined;
		if (root) rmSync(root, { recursive: true, force: true });
		root = undefined;
	});

	async function start(input: Case) {
		root = mkdtempSync(path.join(tmpdir(), "pi-ext-masks-settings-"));
		const write = (dir: string, value: unknown) => {
			mkdirSync(dir, { recursive: true });
			writeFileSync(
				path.join(dir, "settings.json"),
				JSON.stringify({ masks: value }),
			);
		};
		if ("user" in input)
			write(path.join(root, ".test-home/.pi/agent"), input.user);
		if ("project" in input) write(path.join(root, ".pi"), input.project);
		// Masks load before any session, from process.cwd().
		vi.spyOn(process, "cwd").mockReturnValue(root);
		t = await createTestSession({ cwd: root, extensions: [extensionPath] });
		const extension = t.session.extensionRunner.extensions[0];
		const warnings = t.events
			.uiCallsFor("notify")
			.filter((call) => call.args[1] === "warning")
			.map((call) => call.args[0]);
		return { shortcuts: [...extension.shortcuts.keys()], warnings };
	}

	it.each([
		["default", {}, ["alt+m"]],
		[
			"user",
			{ user: { pickerShortcut: "alt+p", items: [mask("a", "alt+1")] } },
			["alt+p", "alt+1"],
		],
		[
			"trusted project ignored",
			{
				user: { items: [mask("a", "alt+1")] },
				project: { pickerShortcut: "alt+p", items: [mask("b", "alt+2")] },
			},
			["alt+m", "alt+1"],
		],
	] satisfies [string, Case, string[]][])(
		"%s",
		async (_name, input, expected) => {
			const { shortcuts, warnings } = await start(input);
			expect(shortcuts).toEqual(expected);
			expect(warnings).toEqual([]);
		},
	);

	it("reports invalid user settings without falling back to project", async () => {
		const { shortcuts, warnings } = await start({
			user: "alt+p",
			project: { items: [mask("b", "alt+2")] },
		});
		expect(shortcuts).toEqual(["alt+m"]);
		expect(warnings).toEqual(["masks must be an object"]);
	});
});