// ═══ shop.js ═══
// ============================================================
//  SHOP.JS — Armory / Command overlay state management
// ============================================================

function openArmory() {
  if (G.gameOver) return;
  G.armoryOpen  = true;
  G.commandOpen = false;
  G.threatOpen  = false;
  G.prestigeOpen = false;
  _radialSlot = -1;
  _shopScrollY = 0;
  setPaused(true, false);
}

function closeArmory() {
  G.armoryOpen = false;
  _shopScrollY = 0;
  setPaused(false);
}

function openCommand() {
  if (G.gameOver) return;
  G.commandOpen = true;
  G.armoryOpen  = false;
  G.threatOpen  = false;
  G.prestigeOpen = false;
  _radialSlot = -1;
  _shopScrollY = 0;
  setPaused(true, false);
}

function closeCommand() {
  G.commandOpen = false;
  _shopScrollY = 0;
  setPaused(false);
}

function openWeaponDetail(slotIndex) {
  if (!G.weapons[slotIndex]) return;
  G.weaponDetailSlot = slotIndex;
  _radialSlot = -1;
  G.armoryOpen = false;
  G.commandOpen = false;
  G.threatOpen = false;
  G.prestigeOpen = false;
  _weaponDetailScrollY = 0;
  setPaused(true, false);
}

function closeWeaponDetail() {
  G.weaponDetailSlot = -1;
  _weaponDetailScrollY = 0;
  if (!G.armoryOpen && !G.commandOpen) setPaused(false);
}

function calcSellPrice(weapon) {
  const def = WEAPON_DEFS.find(d => d.id === weapon.defId);
  const baseSell = Math.floor((def?.cost ?? 0) * 0.5);
  const upgTree = WEAPON_UPGRADE_TREES[weapon.defId] || [];
  const upgSell = (G.weaponUpgradesBought[weapon.instanceId] || []).reduce((sum, id) => {
    const u = upgTree.find(u => u.id === id);
    return sum + Math.floor((u?.cost ?? 0) * 0.5);
  }, 0);
  return baseSell + upgSell;
}

function renderShop() { /* no-op — render loop redraws every frame */ }

function sellWeapon(slotIndex) {
  const w = G.weapons[slotIndex];
  if (!w) return;
  const activeCount = (G.weapons || []).slice(0, G.tower.weaponSlots).filter(x => x != null).length;
  if (activeCount <= 1) { addLog('Cannot sell last weapon!', 'lose'); return; }
  const price = calcSellPrice(w);
  removeWeaponFromSlot(slotIndex);
  const invIdx = (G.weaponInventory || []).findIndex(x => x.instanceId === w.instanceId);
  if (invIdx >= 0) G.weaponInventory.splice(invIdx, 1);
  G.credits += price;
  _radialSlot = -1;
  _sellHoldSlot = -1;
  closeWeaponDetail();
  addLog('Sold ' + getWeaponDef(w).name + ' for ' + price + '¢.', 'win');
  updateHUD();
}