import { execFileSync } from "node:child_process";
import { mkdtempSync, rmSync } from "node:fs";
import { tmpdir } from "node:os";
import path from "node:path";
import { afterEach, describe, expect, it, vi } from "vitest";
import {
	createPiSession,
	type PiSession,
} from "./fixture/create-pi-session.ts";
import { sandboxEnv } from "./fixture/env.ts";
import { writeWindowsExecutable } from "./fixture/windows-executable.ts";

let session: PiSession | undefined;
let root: string | undefined;
afterEach(async () => {
	await session?.dispose();
	session = undefined;
	vi.unstubAllEnvs();
	if (root) rmSync(root, { recursive: true, force: true });
	root = undefined;
});

describe("test environment isolation", () => {
	it("replaces inherited Windows app-data locations before loading Pi", async () => {
		vi.stubEnv("LOCALAPPDATA", "C:\\outside-sandbox\\local");
		vi.stubEnv("APPDATA", "C:\\outside-sandbox\\roaming");
		session = await createPiSession({});
		expect(session.env["LOCALAPPDATA"]).toBe(
			path.join(session.cwd, ".test-state"),
		);
		expect(session.env["APPDATA"]).toBe(path.join(session.cwd, ".config"));
		expect(process.env["LOCALAPPDATA"]).toBe(session.env["LOCALAPPDATA"]);
		expect(process.env["APPDATA"]).toBe(session.env["APPDATA"]);
		await session.dispose();
		expect(process.env["LOCALAPPDATA"]).toBe("C:\\outside-sandbox\\local");
		expect(process.env["APPDATA"]).toBe("C:\\outside-sandbox\\roaming");
	});

	it("keeps custom XDG sandbox roots aligned with native Windows consumers", async () => {
		root = mkdtempSync(path.join(tmpdir(), "pi-ext-fixture-env-"));
		const state = path.join(root, "state");
		const config = path.join(root, "config");
		session = await createPiSession({
			cwd: root,
			env: { XDG_STATE_HOME: state, XDG_CONFIG_HOME: config },
		});
		expect(session.env["LOCALAPPDATA"]).toBe(state);
		expect(session.env["APPDATA"]).toBe(config);
	});

	it("sandboxEnv overrides inherited app-data keys with owned paths", () => {
		root = mkdtempSync(path.join(tmpdir(), "pi-ext-fixture-env-"));
		const env = sandboxEnv(root, { inheritEnv: ["LOCALAPPDATA", "APPDATA"] });
		expect(env["LOCALAPPDATA"]).toBe(env["XDG_STATE_HOME"]);
		expect(env["APPDATA"]).toBe(env["XDG_CONFIG_HOME"]);
		for (const key of ["LOCALAPPDATA", "APPDATA"]) {
			const relative = path.relative(root, env[key]!);
			expect(path.isAbsolute(relative)).toBe(false);
			expect(relative.startsWith("..")).toBe(false);
		}
	});

	it.runIf(process.platform === "win32")(
		"creates a native executable accepting arbitrary CLI flags",
		() => {
			root = mkdtempSync(path.join(tmpdir(), "pi-ext-native-command-"));
			const executable = writeWindowsExecutable(
				root,
				"probe",
				"native command\n",
			);
			expect(
				execFileSync(executable, ["--no-config-file", "-c", "ignored"], {
					encoding: "utf8",
					timeout: 5_000,
					windowsHide: true,
				}),
			).toBe("native command\n");
			expect(
				execFileSync("probe", ["--version"], {
					encoding: "utf8",
					timeout: 5_000,
					windowsHide: true,
					env: {
						...process.env,
						PATH: `${root}${path.delimiter}${process.env["PATH"]}`,
					},
				}),
			).toBe("native command\n");
		},
	);
});