var odinMemoryInterface = new odin.WasmMemoryInterface();
odinMemoryInterface.setIntSize(4);
var odinImports = odin.setupDefaultImports(odinMemoryInterface);

// The Module is used as configuration for emscripten.
var Module = {
	// This is called by emscripten when it starts up.
	instantiateWasm: (imports, successCallback) => {
		const newImports = {
			...odinImports,
			...imports
		}

		return WebAssembly.instantiateStreaming(fetch("/web/static/apps/sim/index.wasm"), newImports).then(function(output) {
			var e = output.instance.exports;
			odinMemoryInterface.setExports(e);
			odinMemoryInterface.setMemory(e.memory);
			return successCallback(output.instance);
		});
	},
	// This happens a bit after `instantiateWasm`, when everything is
	// done setting up. At that point we can run code.
	onRuntimeInitialized: () => {
		var e = wasmExports;

		// Calls any procedure marked with @init
		e._start();

		// See source/main_web/main_web.odin for main_start,
		// main_update and main_end.
		e.main_start();

		function send_resize() {
			var canvas = document.getElementById('canvas');
			e.web_window_size_changed(canvas.width, canvas.height);
		}

		window.addEventListener('resize', function(event) {
			send_resize();
		}, true);

		// This can probably be done better: Ideally we'd feed the
		// initial size to `main_start`. But there seems to be a
		// race condition. `canvas` doesn't have it's correct size yet.
		send_resize();

		// Runs the "main loop".
		function do_main_update() {
			if (!e.main_update()) {
				e.main_end();

				// Calls procedures marked with @fini
				e._end();
				return;
			}
			window.requestAnimationFrame(do_main_update);
		}

		window.requestAnimationFrame(do_main_update);
	},
	print: (function() {
		var element = document.getElementById("output");
		if (element) element.value = ''; // clear browser cache
		return function(text) {
			if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
			console.log(text);
			if (element) {
			  element.value += text + "\n";
			  element.scrollTop = element.scrollHeight; // focus on bottom
			}
		};
	})(),
	canvas: (function() {
		return document.getElementById("canvas");
	})()
};