// deno run --allow-read --allow-write desktop/linux_launcher.ts dist/bworld
// deno desktop has no setting for chromium's command line, but its linux launcher passes its arguments on to chromium.
// so this moves the launcher to bworld-bin and puts a script in its place that starts it with the switches webgpu
// needs on some linux setups. run it on the app folder after deno desktop builds it; running it again does nothing
const SWITCHES = [
	"--enable-unsafe-webgpu",
	"--ozone-platform=x11",
	"--use-angle=vulkan",
	"--enable-features=Vulkan,VulkanFromANGLE",
];

const dir = Deno.args[0];
if (!dir) {
	console.error("usage: linux_launcher.ts <app folder>, like dist/bworld");
	Deno.exit(1);
}
const name = dir.replace(/\/+$/, "").split("/").pop()!;
const launcher = `${dir}/${name}`;
const binary = `${launcher}-bin`;

// already wrapped: the launcher is a script now
const head = new Uint8Array(4);
const file = Deno.openSync(launcher);
file.readSync(head);
file.close();
const is_elf = head[0] === 0x7f && head[1] === 0x45 && head[2] === 0x4c && head[3] === 0x46;
if (!is_elf) {
	console.log(`${launcher} is already wrapped`);
	Deno.exit(0);
}

Deno.renameSync(launcher, binary);
Deno.writeTextFileSync(
	launcher,
	`#!/bin/sh
# starts ${name} with the chromium switches webgpu needs on some linux setups, see desktop/linux_launcher.ts.
# BWORLD_CHROMIUM_FLAGS replaces them, set it to "" to start without any
here="$(dirname "$(readlink -f "$0")")"
# the binary finds its runtime by its own name, which is ${name}.so and not ${name}-bin.so
export LAUFEY_RUNTIME_PATH="$here/${name}.so"
exec "$here/${name}-bin" \${BWORLD_CHROMIUM_FLAGS-${SWITCHES.join(" ")}} "$@"
`,
);
Deno.chmodSync(launcher, 0o755);
console.log(`Wrapped ${launcher}: ${SWITCHES.join(" ")}`);