import makeConfig from "./utils/config.js";

document.addEventListener("touchmove", (e) => e.preventDefault(), {
	passive: false,
});

const supportsWebGPU = async () => {
	return (
		window.GPUQueue != null &&
		navigator.gpu != null &&
		navigator.gpu.getPreferredCanvasFormat != null
	);
};

const isRunningSwiftShader = () => {
	const gl = document.createElement("canvas").getContext("webgl");
	const debugInfo = gl.getExtension("WEBGL_debug_renderer_info");
	const renderer = gl.getParameter(debugInfo.UNMASKED_RENDERER_WEBGL);
	return renderer.toLowerCase().includes("swiftshader");
};

document.body.onload = async () => {
	const urlParams = new URLSearchParams(window.location.search);
	const config = makeConfig(Object.fromEntries(urlParams.entries()));
	const useWebGPU = (await supportsWebGPU()) && ["webgpu"].includes(config.renderer?.toLowerCase());
	const rendererModule = import(`./${useWebGPU ? "webgpu" : "regl"}/renderer.js`);

	const initialize = async (config) => {
		const Renderer = (await rendererModule).default;
		const renderer = new Renderer();
		await renderer.ready;
		renderer.size = [window.innerWidth, window.innerHeight].map(
			(n) => n * (window.devicePixelRatio ?? 1) * config.resolution,
		);
		window.onresize = () => {
			renderer.size = [window.innerWidth, window.innerHeight].map(
				(n) => n * (window.devicePixelRatio ?? 1) * config.resolution,
			);
		};
		window.addEventListener("dblclick", () => {
			renderer.fullscreen = !renderer.fullscreen;
		});
		document.body.appendChild(renderer.canvas);
		await renderer.configure(config);
	};

	if (isRunningSwiftShader() && !config.suppressWarnings) {
		const notice = document.createElement("notice");
		notice.innerHTML = `<div class="notice">
		<p>Wake up, Neo... you've got hardware acceleration disabled.</p>
		<p>This project will still run, incredibly, but at a noticeably low framerate.</p>
		<button class="blue pill">Plug me in</button>
		<a class="red pill" target="_blank" href="https://www.google.com/search?q=chrome+enable+hardware+acceleration">Free me</a>
		`;
		document.body.appendChild(notice);
		document.querySelector(".blue.pill").addEventListener("click", async () => {
			config.suppressWarnings = true;
			urlParams.set("suppressWarnings", true);
			history.replaceState({}, "", "?" + unescape(urlParams.toString()));
			await initialize(config);
			document.body.removeChild(notice);
		});
	} else {
		await initialize(config);
	}
};