function tohex(n) {
  var s = Math.floor(n).toString(16);
  if (s.length === 1) s = "0" + s;
  return s.toUpperCase();
};

var Color = {
  white: [1, 1, 1],
  black: [0, 0, 0],
  blue: [0, 0, 1],
  green: [0, 1, 0],
  yellow: [1, 1, 0],
  red: [1, 0, 0],
  gray: [0.71, 0.71, 0.71],
  cyan: [0, 1, 1],
  purple: [0.635, 0.365, 0.89],
  orange: [1, 0.565, 0.251],
  magenta: [1, 0, 1],
};

Color.editor = {};
Color.editor.ur = Color.green;

Color.tohtml = function (v) {
  var html = v.map(function (n) {
    return tohex(n * 255);
  });
  return "#" + html.join("");
};

var esc = {};
esc.reset = "\x1b[0";
esc.color = function (v) {
  var c = v.map(function (n) {
    return Math.floor(n * 255);
  });
  var truecolor = "\x1b[38;2;" + c.join(";") + ";";
  return truecolor;
};

esc.doc = "Functions and constants for ANSI escape sequences.";

Color.Arkanoid = {
  orange: [1, 0.561, 0],
  teal: [0, 1, 1],
  green: [0, 1, 0],
  red: [1, 0, 0],
  blue: [0, 0.439, 1],
  purple: [1, 0, 1],
  yellow: [1, 1, 0],
  silver: [0.616, 0.616, 0.616],
  gold: [0.737, 0.682, 0],
};

Color.Arkanoid.Powerups = {
  red: [0.682, 0, 0] /* laser */,
  blue: [0, 0, 0.682] /* enlarge */,
  green: [0, 0.682, 0] /* catch */,
  orange: [0.878, 0.561, 0] /* slow */,
  purple: [0.824, 0, 0.824] /* break */,
  cyan: [0, 0.682, 1] /* disruption */,
  gray: [0.561, 0.561, 0.561] /* 1up */,
};

Color.Gameboy = {
  darkest: [0.898, 0.42, 0.102],
  dark: [0.898, 0.741, 0.102],
  light: [0.741, 0.898, 0.102],
  lightest: [0.42, 0.898, 0.102],
};

Color.Apple = {
  green: [0.369, 0.741, 0.243],
  yellow: [1, 0.725, 0],
  orange: [0.969, 0.51, 0],
  red: [0.886, 0.22, 0.22],
  purple: [0.592, 0.224, 0.6],
  blue: [0, 0.612, 0.875],
};

Color.Debug = {
  boundingbox: Color.white,
  names: [0.329, 0.431, 1],
};

Color.Editor = {
  grid: [0.388, 1, 0.502],
  select: [1, 1, 0.216],
  newgroup: [0.471, 1, 0.039],
};

/* Detects the format of all colors and munges them into a floating point format */
Color.normalize = function (c) {
  var add_a = function (a) {
    var n = this.slice();
    n[3] = a;
    return n;
  };

  for (var p of Object.keys(c)) {
    if (typeof c[p] !== "object") continue;
    if (!Array.isArray(c[p])) {
      Color.normalize(c[p]);
      continue;
    }

    // Add alpha channel if not present
    if (c[p].length === 3) {
      c[p][3] = 1;
    }

    // Check if any values are > 1 (meaning they're in 0-255 format)
    var needs_conversion = false;
    for (var color of c[p]) {
      if (color > 1) {
        needs_conversion = true;
        break;
      }
    }

    // Convert from 0-255 to 0-1 if needed
    if (needs_conversion) {
      c[p] = c[p].map(function (x) {
        return x / 255;
      });
    }
    
    c[p].alpha = add_a;
  }
};

Color.normalize(Color);

var ColorMap = {};
ColorMap.makemap = function (map) {
  var newmap = Object.create(ColorMap);
  Object.assign(newmap, map);
  return newmap;
};
ColorMap.Jet = ColorMap.makemap({
  0: [0, 0, 0.514],
  0.125: [0, 0.235, 0.667],
  0.375: [0.02, 1, 1],
  0.625: [1, 1, 0],
  0.875: [0.98, 0, 0],
  1: [0.502, 0, 0],
});

ColorMap.BlueRed = ColorMap.makemap({
  0: [0, 0, 1],
  1: [1, 0, 0],
});

ColorMap.Inferno = ColorMap.makemap({
  0: [0, 0, 0.016],
  0.13: [0.122, 0.047, 0.282],
  0.25: [0.333, 0.059, 0.427],
  0.38: [0.533, 0.133, 0.416],
  0.5: [0.729, 0.212, 0.333],
  0.63: [0.89, 0.349, 0.2],
  0.75: [0.976, 0.549, 0.039],
  0.88: [0.976, 0.788, 0.196],
  1: [0.988, 1, 0.643],
});

ColorMap.Bathymetry = ColorMap.makemap({
  0: [0.157, 0.102, 0.173],
  0.13: [0.233, 0.192, 0.353],
  0.25: [0.251, 0.298, 0.545],
  0.38: [0.247, 0.431, 0.592],
  0.5: [0.282, 0.557, 0.62],
  0.63: [0.333, 0.682, 0.639],
  0.75: [0.471, 0.808, 0.639],
  0.88: [0.733, 0.902, 0.675],
  1: [0.992, 0.996, 0.8],
});

ColorMap.Viridis = ColorMap.makemap({
  0: [0.267, 0.004, 0.329],
  0.13: [0.278, 0.173, 0.478],
  0.25: [0.231, 0.318, 0.545],
  0.38: [0.173, 0.443, 0.557],
  0.5: [0.129, 0.565, 0.553],
  0.63: [0.153, 0.678, 0.506],
  0.75: [0.361, 0.784, 0.388],
  0.88: [0.667, 0.863, 0.196],
  1: [0.992, 0.906, 0.145],
});

Color.normalize(ColorMap);

ColorMap.sample = function (t, map = this) {
  if (t < 0) return map[0];
  if (t > 1) return map[1];

  var lastkey = 0;
  for (var key of Object.keys(map).sort()) {
    if (t < key) {
      var b = map[key];
      var a = map[lastkey];
      var tt = (key - lastkey) * t;
      return a.lerp(b, tt);
    }
    lastkey = key;
  }
  return map[1];
};

ColorMap.doc = {
  sample: "Sample a given colormap at the given percentage (0 to 1).",
};

Color.maps = ColorMap
Color.utils = esc

return Color