server/www/hanafuda.js

function Hanafuda(modules) {
  var Flower = Object.freeze({
    Pine: 0,
    Plum: 1,
    Cherry: 2,
    Wisteria: 3,
    Iris: 4,
    Peony: 5,
    BushClover: 6,
    SusukiGrass: 7,
    Chrysanthemum: 8,
    Maple: 9,
    Willow: 10,
    Paulownia: 11
  });

  var Family = Object.freeze(
    ["Kasu", "Tan", "Tane", "Hikari"].reduce(function(o, name) {
      o[name] = {class: name[0].toLowerCase() + name.slice(1)};
      return o;
    }, {})
  );

  var CardNames = [
    "Pine0", "Pine1", "PinePoetry", "Crane",
    "Plum0", "Plum1", "PlumPoetry", "BushWarbler",
    "Cherry0", "Cherry1", "CherryPoetry", "CampCurtain",
    "Wisteria0", "Wisteria1", "WisteriaRed", "Cuckoo",
    "Iris0", "Iris1", "IrisRed", "EightPlankBridge",
    "Peony0", "Peony1", "PeonyBlue", "Butterflies",
    "BushClover0", "BushClover1", "BushCloverRed", "Boar",
    "SusukiGrass0", "SusukiGrass1", "Geese", "FullMoon",
    "Chrysanthemum0", "Chrysanthemum1", "ChrysanthemumBlue", "SakeCup",
    "Maple0", "Maple1", "MapleBlue", "Deer",
    "Lightning", "WillowRed", "Swallow", "RainMan",
    "Paulownia0", "Paulownia1", "Sand", "Phoenix"
  ];

  var Card = Object.freeze(
    CardNames.reduce(function(o, name, i) {
      o[name] = {
        id: i,
        family: findFamily(name, i),
        flower: Math.floor(i / 4),
        name: name
      };
      return o;
    }, {})
  );

  function findFamily(name, i) {
    if((i % 4 < 2 && i < 41) || (i > 43 && i < 47)) {
      return Family.Kasu;
    } else if(name.match(/(Blue|Poetry|Red)/)) {
      return Family.Tan;
    } else if(["Crane", "CampCurtain", "FullMoon", "RainMan", "Phoenix"].includes(name)) {
      return Family.Hikari;
    } else {
      return Family.Tane;
    }
  }

  return {
    Flower: Flower,
    Family: Family,
    Card: Card,
    getValue: getValue,
    sameMonth: sameMonth
  };

  function sameMonth(card) {
    var first = 4 * card.flower;
    return [0,1,2,3].map(function(i) {return Card[CardNames[first + i]];});
  }

  function getValue(card) {
    var first = 4 * card.flower;
    return card.id - first;
  }

}