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<!DOCTYPE html>
<title>Explore the Torus</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
	body {
		color: white;
		background-color: black;
		text-align: center;
	}
	a { color: white; }
	img {
		max-width: 100%;
		image-rendering: pixelated;
	}
	table { margin: auto; }
	button.arr { font-size: 150%; }
</style>
<p>
A collaborative ASCII art project.
<p>
<a href="ssh://torus@ascii.town"><code>ssh torus@ascii.town</code></a>
<p>
<img id="tile" src="tile.png">
<table>
	<tr>
		<td rowspan="2">
			<button id="larr" class="arr" type="button">&larr;</button>
		</td>
		<td><button id="uarr" class="arr" type="button">&uarr;</button></td>
		<td rowspan="2">
			<button id="rarr" class="arr" type="button">&rarr;</button>
		</td>
	</tr>
	<tr>
		<td><button id="darr" class="arr" type="button">&darr;</button></td>
	</tr>
	<tr>
		<td colspan="3"><button id="home" type="button">HOME</button></td>
	</tr>
</table>
<p>
This is AGPLv3 Free Software!
Code is available from
<a href="https://git.causal.agency/torus">Causal Agency</a>.

<script>
	/* Copyright (C) 2019  C. McEnroe <june@causal.agency>
	 *
	 * This program is free software: you can redistribute it and/or modify
	 * it under the terms of the GNU Affero General Public License as published by
	 * the Free Software Foundation, either version 3 of the License, or
	 * (at your option) any later version.
	 *
	 * This program is distributed in the hope that it will be useful,
	 * but WITHOUT ANY WARRANTY; without even the implied warranty of
	 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	 * GNU Affero General Public License for more details.
	 *
	 * You should have received a copy of the GNU Affero General Public License
	 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
	 */

	let tile = document.getElementById("tile");
	let larr = document.getElementById("larr");
	let darr = document.getElementById("darr");
	let uarr = document.getElementById("uarr");
	let rarr = document.getElementById("rarr");

	let state = new URLSearchParams();

	function setImage() {
		let url = new URL(tile.src);
		url.search = "?" + state.toString();
		tile.src = url.toString();
	}

	window.onhashchange = function() {
		state = new URLSearchParams(document.location.hash.slice(1));
		setImage();
	}
	window.onhashchange();

	function setState(x, y) {
		state.set("x", x);
		state.set("y", y);
		history.pushState(state.toString(), "", "#" + state.toString());
		setImage();
	}
	function move(dx, dy) {
		setState(+state.get("x") + dx, +state.get("y") + dy);
	}
	window.onpopstate = function(event) {
		state = new URLSearchParams(event.state);
		setImage();
	}
	
	home.onclick = () => setState(0, 0);
	larr.onclick = () => move(-1,  0);
	darr.onclick = () => move( 0,  1);
	uarr.onclick = () => move( 0, -1);
	rarr.onclick = () => move( 1,  0);
	document.onkeydown = function(event) {
		switch (event.key) {
			case "Q": case "Home":       home.onclick(); break;
			case "h": case "ArrowLeft":  larr.onclick(); break;
			case "j": case "ArrowDown":  darr.onclick(); break;
			case "k": case "ArrowUp":    uarr.onclick(); break;
			case "l": case "ArrowRight": rarr.onclick(); break;
		}
		return false;
	}
</script>