content: enum UpgradeType { electricity, charm, illumina, explorer, starlink, colosseum }
  
  class Upgrade {
    final UpgradeType type;
    final String description;
    final String effect;
    final String effectValue;
    final int cost;
  
    const Upgrade(
        {required this.type,
        required this.cost,
        required this.description,
        required this.effect,
        required this.effectValue});
  }
  
  const Map<UpgradeType, Upgrade> kUpgradesData = {
    UpgradeType.electricity: Upgrade(
        type: UpgradeType.electricity,
        cost: 3500,
        description: 'Brings the Industrial Revolution',
        effect: 'Income',
        effectValue: '+10%'),
    UpgradeType.charm: Upgrade(
        type: UpgradeType.charm,
        cost: 2500,
        description: 'A Bio-Tech Weapon to support your Ships',
        effect: 'Defense',
        effectValue: '+1'),
    UpgradeType.illumina: Upgrade(
        type: UpgradeType.illumina,
        cost: 4000,
        description: 'A Worthy Successor to Charm',
        effect: 'Defense',
        effectValue: '+2'),
    UpgradeType.explorer: Upgrade(
        type: UpgradeType.explorer,
        cost: 5000,
        description: 'Finds new Intergalactic Trade Routes',
        effect: 'Morale',
        effectValue: '+15%'),
    UpgradeType.starlink: Upgrade(
        type: UpgradeType.starlink,
        cost: 4000,
        description: 'Connects the Planet By Internet',
        effect: 'Morale',
        effectValue: '+10%'),
    UpgradeType.colosseum: Upgrade(
        type: UpgradeType.colosseum,
        cost: 7000,
        description: "The Ultimate Proof of a Specie's Advancement",
        effect: 'GPI',
        effectValue: '++'),
  };
  