Battle-for-Tismo/shared/data/buildings.js

// Buildings that can be raised in a city. Build costs are fixed and grow only
// with the level, with no level cap; upkeep is 1% of that cost, so it follows
// the level too.

import { EFFECT_GDP, EFFECT_BUDGET_INCOME, EFFECT_RESEARCH, EFFECT_CULTURE, effect } from "./effects.js";

// Buildings whose benefit is a rule rather than a stat effect. Kept as ids so
// the simulation and the UI can name them without magic strings.
export const BUILDING_MECHANIC = {
  // Units: one more parallel training line per level.
  PARALLEL_TRAINING: "parallel_training",
  // Buildings: one more parallel construction line per level.
  PARALLEL_BUILDING: "parallel_building",
  // Cuts civilian deaths from bombing, and is very hard to knock down.
  CIVILIAN_SHELTER: "civilian_shelter",
  // Fires one volley at hostile aircraft passing over the city.
  AIR_DEFENSE: "air_defense",
  // Flat GDP per capita for the city's region, per adjacent sea tile.
  PORT_GDP: "port_gdp",
  // Lets people fly in from any other city with an airport.
  AIR_IMMIGRATION: "air_immigration",
};

export const BUILDINGS = [
  {
    id: "market",
    name: "Market",
    description: "A hub of local trade. Raises the GDP per capita of the city's region, with diminishing returns.",
    baseCost: 500_000,
    costAlpha: 1.2,
    refundFraction: 0.5,
    effects: [effect(EFFECT_GDP, 0.04, 0.75)],
    icon: "icon_market.svg",
  },
  {
    id: "bank",
    name: "Bank",
    description: "Channels private wealth into the state coffers. Raises the tax collected from the city's region.",
    baseCost: 1_000_000,
    costAlpha: 1.3,
    refundFraction: 0.5,
    effects: [effect(EFFECT_BUDGET_INCOME, 0.05, 0.7)],
    icon: "icon_bank.svg",
  },
  {
    id: "barracks",
    name: "Barracks",
    description: "Enables training infantry units. Each level allows one more parallel training.",
    baseCost: 10_000_000,
    costAlpha: 1.1,
    refundFraction: 0.5,
    effects: [],
    mechanic: "parallel_training",
    icon: "icon_barracks.svg",
  },
  {
    id: "shelters",
    name: "Wartime shelters",
    description: "Each level reduces civilian life loss from bombing by 10%. Extremely hard to destroy. Does not protect other buildings.",
    baseCost: 100_000_000,
    costAlpha: 2,
    refundFraction: 0.5,
    effects: [],
    mechanic: "civilian_shelter",
    civilianProtectionPerLevel: 0.1,
    // Multiplies the odds of the city losing a level of this building to a
    // bombardment: at a tenth of the normal chance it is very hard to destroy.
    destructionResistance: 0.1,
    icon: "icon_shelters.svg",
  },
  {
    id: "aa_building",
    name: "Air defense",
    description: "Damages hostile aircraft that fly above this city.",
    baseCost: 1_000_000_000,
    costAlpha: 2,
    refundFraction: 0.5,
    effects: [],
    mechanic: "air_defense",
    icon: "icon_aa_building.svg",
  },
  {
    id: "research_lab",
    name: "Research lab",
    description: "Applies science to industry and government. Produces research points for the whole nation.",
    baseCost: 100_000_000,
    costAlpha: 1.65,
    refundFraction: 0.5,
    effects: [effect(EFFECT_RESEARCH, 1.0, 0.9)],
    icon: "icon_research_lab.svg",
  },
  {
    id: "university",
    name: "University",
    description: "Higher education produces research and a little culture for the whole nation.",
    baseCost: 100_000_000,
    costAlpha: 1.7,
    refundFraction: 0.5,
    effects: [effect(EFFECT_RESEARCH, 2.0, 0.8), effect(EFFECT_CULTURE, 0.5, 0.7)],
    icon: "icon_university.svg",
  },
  {
    id: "museum",
    name: "Museum",
    description: "Preserves the nation's heritage, raising its culture output across the country.",
    baseCost: 50_000_000,
    costAlpha: 1.6,
    refundFraction: 0.5,
    effects: [effect(EFFECT_CULTURE, 1.5, 0.85)],
    icon: "icon_museum.svg",
  },
  {
    id: "cinema_studio",
    name: "Cinema studio",
    description: "Mass media spreads the nation's culture, raising its culture output across the country.",
    baseCost: 50_000_000,
    costAlpha: 1.75,
    refundFraction: 0.5,
    effects: [effect(EFFECT_CULTURE, 3.0, 0.7)],
    icon: "icon_cinema_studio.svg",
  },
  {
    id: "port",
    name: "Port",
    description: "Warm water port. Gains 1000 GDP/capita per tile per level.",
    baseCost: 20_000_000,
    costAlpha: 1.7,
    refundFraction: 0.5,
    effects: [effect(EFFECT_BUDGET_INCOME, 0.08, 0.7)],
    // Every tile the city's region covers gains this much GDP per capita for
    // each sea tile next to the city, per port level.
    mechanic: "port_gdp",
    gdpPerCapitaPerSeaTilePerLevel: 1000,
    icon: "icon_port.svg",
    coastal: true,
  },
  {
    id: "airport",
    name: "Airport",
    description: "An airfield with a control tower. Lets the city train aircraft and serves as a home airbase for them to land and refuel. Immigration can reach this city from any other city in the world with an airport. The effect scales with airport level.",
    baseCost: 250_000_000,
    costAlpha: 1.7,
    refundFraction: 0.5,
    effects: [effect(EFFECT_GDP, 0.05, 0.8)],
    mechanic: "air_immigration",
    icon: "icon_airport.svg",
  },
  {
    id: "shipyard",
    name: "Shipyard",
    description: "Naval yards that build warships. Only a coastal city can raise one, and it must already have a port. Each level adds one parallel building queue.",
    baseCost: 150_000_000,
    costAlpha: 1.65,
    refundFraction: 0.5,
    effects: [],
    mechanic: "parallel_building",
    icon: "icon_shipyard.svg",
    coastal: true,
    requiresBuilding: "port",
  },
];

export function buildingById(id) {
  return BUILDINGS.find((b) => b.id === id) || null;
}