#!/usr/bin/env node

var sys = require("sys");
var fs  = require("fs");
var PEG = require("../lib/peg");

[
  "benchmarks.js",
  "runner.js",
].forEach(function(file) {
  eval(fs.readFileSync(__dirname + "/" + file, "utf8"));
});

/* Results Table Manipulation */

function dup(text, count) {
  var result = "";
  for (var i = 1; i <= count; i++) {
    result += text;
  }
  return result;
}

function padLeft(text, length) {
  return dup(" ", length - text.length) + text;
}

function padRight(text, length) {
  return text + dup(" ", length - text.length);
}

function center(text, length) {
  var padLength = (length - text.length) / 2;
  return dup(" ", Math.floor(padLength))
    + text
    + dup(" ", Math.ceil(padLength));
}

function writeTableHeader() {
  sys.puts("+-------------------------------------+-----------+------------+--------------+");
  sys.puts("|                Test                 | Inp. size | Avg. time  |  Avg. speed  |");
}

function writeHeading(heading) {
  sys.puts("+-------------------------------------+-----------+------------+--------------+");
  sys.puts("| " + center(heading, 75) + " |");
  sys.puts("+-------------------------------------+-----------+------------+--------------+");
}

function writeResult(title, inputSize, parseTime) {
  var KB      = 1024;
  var MS_IN_S = 1000;

  sys.puts("| "
    + padRight(title, 35)
    + " | "
    + padLeft((inputSize / KB).toFixed(2), 6)
    + " kB | "
    + padLeft(parseTime.toFixed(2), 7)
    + " ms | "
    + padLeft(((inputSize / KB) / (parseTime / MS_IN_S)).toFixed(2), 7)
    + " kB/s |"
  );
}

function writeSeparator() {
  sys.puts("+-------------------------------------+-----------+------------+--------------+");
}

function writeTableFooter() {
  sys.puts("+-------------------------------------+-----------+------------+--------------+");
}

/* Helpers */

function exitFailure() {
  process.exit(1);
}

function abort(message) {
  sys.error(message);
  exitFailure();
}

/* Main */

var args = process.argv.slice(2); // Trim "node" and the script path.

switch (args.length) {
  case 0:
    var runCount = 10;
    break;
  case 1:
    var runCount = parseInt(args[0]);
    if (isNaN(runCount) || runCount <= 0) {
      abort("Number of runs must be a positive integer.");
    }
    break;
  default:
    abort("Too many arguments.");
}

sys.puts("Each test is run " + runCount + " times.");
sys.puts("");

Runner.run(benchmarks, runCount, {
  readFile: function(file) {
    return fs.readFileSync(__dirname + "/" + file, "utf8");
  },

  testStart: function(benchmark, test) {
    /* Nothing to do. */
  },

  testFinish: function(benchmark, test, inputSize, parseTime) {
    writeResult(test.title, inputSize, parseTime);
  },

  benchmarkStart: function(benchmark) {
    writeHeading(benchmark.title);
  },

  benchmarkFinish: function(benchmark, inputSize, parseTime) {
    writeSeparator();
    writeResult(benchmark.title + " total", inputSize, parseTime);
  },

  start: function() {
    writeTableHeader();
  },

  finish: function(inputSize, parseTime) {
    writeSeparator();
    writeResult("Total", inputSize, parseTime);
    writeTableFooter();
  },
});