// ============ research.js — unlock tree ============
import { UNLOCKS, RESEARCH_TRACKS } from '../core/config.js';

export function isUnlocked(state, key) {
  if (state.sandbox) return true;
  return state.research.unlocked.includes(key);
}

export function canBuy(state, u) {
  if (isUnlocked(state, u.key)) return { ok: false, why: 'owned' };
  if (state.research.rp >= u.rp) return { ok: true };
  return { ok: false, why: 'rp' };
}

export function buyUnlock(state, key) {
  const u = UNLOCKS.find(u => u.key === key);
  if (!u) return false;
  const chk = canBuy(state, u);
  if (!chk.ok) return false;
  state.research.rp -= u.rp;
  state.research.spentTotal += u.rp;
  state.research.unlocked.push(key);
  state.toasts.push({ kind: 'good', title: 'Research complete!', text: `${u.label} is now available to build.` });
  return true;
}

export function unlocksByTrack() {
  const out = {};
  for (const t of Object.keys(RESEARCH_TRACKS)) out[t] = [];
  for (const u of UNLOCKS) (out[u.track] || (out[u.track] = [])).push(u);
  return out;
}