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const express = require("express");
const chroma = require("chroma-js");
const fs = require("fs-extra");

const app = express();

const scaleGood = chroma.scale(["blue", "green"]);
const scaleOk   = chroma.scale(["yellow", "orange"]);
const scaleBad  = chroma.scale(["red", "black"]);

let gcc = new Map([
	["cell.l4", 310422],
	["collatz.l4", 89811],
	["fibrec.l4", 164551],
	["floyd.l4", 191644],
	["gcd.l4", 245165],
	["list.l4", 354856],
	["mmult2.l4", 167739],
	["mmult.l4", 292616],
	["msort.l4", 97452],
	["prime.l4", 83499],
	["qsort.l4", 321400],
	["shifts.l4", 94324],
	["tree.l4", 139278],
	["avl.l4", 5724362],
	["hashtable.l4", 1446232],
	["heaps.l4", 6023667],
	["md5.l4", 2557570]
]);


app.get("/", (req, res) => {
	fs.readFile("last.log")
	.then((data) => {
		data = data.toString();
		data = data.split(/-- Timing file .*\/([a-z0-9]+\.l4) --/);
		data = data.slice(1);

		map = new Map();

		for (let i = 0; i < data.length; i += 2) {
			let key = data[i];
			let value =
				data[i+1]
					.split("\n")
					.slice(1,7)
					.map((v) => {
						let match = /.*?(\d{3,}).*/.exec(v);
						return match === null ? null : parseInt(match[1]);
					})
			value = value.reduce((a, b) => a == null ? null : (b == null ? null : Math.min(a, b)));
			map.set(key, value);
		}

		let out = `
		<html>
		<head><style>th, td { padding: .4em }</style></head>
		<body>
		<h1>Testing Results</h1>
		<table>
			<tr><th>Test file</th><th>Your Cycles</th><th>GCC Cycles</th><th>Performance</th></tr>`;

		let perfScore = 0;

		for (let [file, gccCycles] of gcc) {
			let yourCycles = map.get(file);

			if (yourCycles == null) {
				out += `\n<tr style="background-color: black; color: white;"><td>${file}</td><td><b>FAILED</b></td><td>${gccCycles}</td><td><b>FAILED</b></td></tr>`;
				perfScore = NaN;
			} else {
				let perf = yourCycles / gccCycles;
				let color = "red";
				if (perf <= .7){
					color = scaleGood(perf / .7);
				} else if (perf <= 1) {
					color = scaleOk((perf - .7) / .3);
				} else {
					color = scaleBad((perf - 1) / .4);
				}
				out += `\n<tr style="background-color: ${color.hex()}; color: white;"><td>${file}</td><td>${yourCycles}</td><td>${gccCycles}</td><td>${Math.round(perf*1000)/1000}</td></tr>`;
				perfScore += perf;
			}
		}

		perfScore /= gcc.size;

		out += `\n</table><h2>Final perf score: ${isNaN(perfScore) ? "FAILED" : Math.round(perfScore*10000)/10000}</body></html>`;
		res.send(out);
	});
});

app.listen(1337);
console.log("Listening on *:1337");