// Effects: the single vocabulary used by upgrades, research, legacy perks,
// achievements, chips and temporary buffs. To add a new effect type: register
// it here, add its `effect.<type>` text to the core locale files, then use it
// in any data file.

export function newModifiers() {
  return {
    click: 1,
    generators: {},
    global: 1,
    demand: 1,
    value: 1,
    materialEfficiency: 1,
    batchDiscount: 1,
    batchSize: 1,
    autoBuyMaterial: false,
    dividend: 1,
    reliability: 0,
    offline: 0,
    contract: 1,
    rp: 1,
    generatorCost: 1,
    startFunds: 0,
    priceAdvisor: false,
    materialPrice: 1,
    legacyGain: 1,
  };
}

// `times` lets a repeatable effect (a perk level, N achievements) stack.
function mult(key) {
  return (m, e, times) => {
    m[key] *= e.value ** times;
  };
}

function add(key) {
  return (m, e, times) => {
    m[key] += e.value * times;
  };
}

function flag(key) {
  return (m) => {
    m[key] = true;
  };
}

const APPLY = {
  click_mult: mult('click'),
  generator_mult: (m, e, times) => {
    m.generators[e.target] = (m.generators[e.target] ?? 1) * e.value ** times;
  },
  global_mult: mult('global'),
  demand_mult: mult('demand'),
  value_mult: mult('value'),
  material_efficiency: mult('materialEfficiency'),
  batch_discount: mult('batchDiscount'),
  batch_size_mult: mult('batchSize'),
  auto_buy_material: flag('autoBuyMaterial'),
  dividend_mult: mult('dividend'),
  reliability_add: add('reliability'),
  offline_add: add('offline'),
  contract_mult: mult('contract'),
  rp_mult: mult('rp'),
  generator_cost_mult: mult('generatorCost'),
  start_funds: add('startFunds'),
  price_advisor: flag('priceAdvisor'),
  material_price_mult: mult('materialPrice'),
  legacy_gain_mult: mult('legacyGain'),
};

export const EFFECT_TYPES = Object.keys(APPLY);

/** Fold a list of `{ effect, times }` entries into one set of multipliers. */
export function foldEffects(entries) {
  const m = newModifiers();
  for (const { effect, times = 1 } of entries) {
    if (effect && times > 0) APPLY[effect.type]?.(m, effect, times);
  }
  return m;
}