import { spawnSync } from "node:child_process";
import {
	chmodSync,
	copyFileSync,
	mkdirSync,
	mkdtempSync,
	rmSync,
} from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { fileURLToPath } from "node:url";

const source = fileURLToPath(new URL(".", import.meta.url));
const temp = mkdtempSync(join(tmpdir(), "pi-os-notifier-focus-build-"));
const classes = join(temp, "classes");
const dex = join(temp, "dex");
function run(command, args) {
	const result = spawnSync(command, args, {
		stdio: "inherit",
		timeout: 30_000,
	});
	if (result.error) throw result.error;
	if (result.status !== 0)
		throw new Error(`${command} failed: ${result.status ?? result.signal}`);
}
try {
	mkdirSync(classes);
	mkdirSync(dex);
	run("javac", [
		"--release",
		"8",
		"-g:none",
		"-Xlint:-options",
		"-d",
		classes,
		join(source, "stubs/android/app/ActivityManager.java"),
		join(source, "stubs/android/app/IActivityManager.java"),
		join(source, "F.java"),
	]);
	// Compile-only Android signatures are deliberately excluded from the DEX.
	run("d8", [
		"--release",
		"--min-api",
		"26",
		"--lib",
		classes,
		"--output",
		dex,
		join(classes, "F.class"),
	]);
	run("jar", [
		"--create",
		"--no-manifest",
		"--date=2000-01-01T00:00:00Z",
		"--file",
		join(temp, "focus.jar"),
		"-C",
		dex,
		"classes.dex",
	]);
	const target = join(source, "focus.jar");
	// Normal resource permissions; runtime removes write bits before Android loads it.
	try {
		chmodSync(target, 0o644);
	} catch (error) {
		if (error.code !== "ENOENT") throw error;
	}
	copyFileSync(join(temp, "focus.jar"), target);
} finally {
	rmSync(temp, { recursive: true, force: true });
}