// ═══ renderer-inventory.js ═══
// ============================================================
//  RENDERER INVENTORY — bottom weapon drawer
// ============================================================

const _PK_X = 16, _PK_Y = 642, _PK_W = 1298, _PK_H = 244;
const _PK_PAD = 16;
const _PK_TITLE_H = 24;
const _PK_CLOSE_H = 30;
const _PK_BODY_Y  = _PK_Y + _PK_PAD + _PK_TITLE_H;
const _PK_BODY_H  = _PK_H - _PK_PAD * 2 - _PK_TITLE_H - _PK_CLOSE_H;
const _PK_DETAIL_W = 246;
const _PK_GAP      = 12;
const _PK_LIST_X   = _PK_X + _PK_PAD;
const _PK_LIST_W   = _PK_W - _PK_PAD * 2 - _PK_GAP - _PK_DETAIL_W;
const _PK_DET_X    = _PK_LIST_X + _PK_LIST_W + _PK_GAP;
const _PK_CARD_W = 92, _PK_CARD_H = 70, _PK_CARD_GAP = 8;
const _PK_SECT_H = 18, _PK_DROP_H = 32;
const _PK_CPR    = Math.floor((_PK_LIST_W + _PK_CARD_GAP) / (_PK_CARD_W + _PK_CARD_GAP));

let _pickerHoverWeapon = null;
let _pickerHoverDef    = null;

function drawInventoryOverlay() {
  if (!document.body.classList.contains('inventory-open')) return;

  const W = canvas.width, H = canvas.height;
  const equipMode = _pickerSlot >= 0;

  ctx.fillStyle = 'rgba(0,0,0,0.42)';
  ctx.fillRect(0, 0, W, H);

  ctx.fillStyle = '#060e16';
  ctx.strokeStyle = '#1a3048';
  ctx.lineWidth = 1;
  ctx.fillRect(_PK_X, _PK_Y, _PK_W, _PK_H);
  ctx.strokeRect(_PK_X, _PK_Y, _PK_W, _PK_H);

  ctx.save();

  const titleSuffix = equipMode ? `- SLOT ${_pickerSlot + 1}` : '';
  ctx.font = '11px Orbitron, "Share Tech Mono", monospace';
  ctx.letterSpacing = '3px';
  ctx.textAlign = 'left';
  ctx.textBaseline = 'top';
  ctx.fillStyle = '#00d4ff';
  ctx.fillText('WEAPON INVENTORY ' + titleSuffix, _PK_LIST_X, _PK_Y + _PK_PAD);
  ctx.letterSpacing = '0px';

  const invCount = (G.weaponInventory || []).length;
  ctx.font = '10px "Share Tech Mono", monospace';
  ctx.fillStyle = '#3a6080';
  ctx.fillText(invCount + ' in inventory', _PK_LIST_X + 270, _PK_Y + _PK_PAD + 1);

  ctx.strokeStyle = '#1a3048';
  ctx.lineWidth = 1;
  ctx.beginPath();
  ctx.moveTo(_PK_X, _PK_BODY_Y - 8);
  ctx.lineTo(_PK_X + _PK_W, _PK_BODY_Y - 8);
  ctx.stroke();

  const CB_W = 110, CB_H = 26;
  const CB_X = _PK_X + _PK_W - _PK_PAD - CB_W;
  const CB_Y = _PK_Y + 7;
  const cbHov = isHovered(CB_X, CB_Y, CB_W, CB_H);
  ctx.fillStyle  = cbHov ? '#1a0808' : 'transparent';
  ctx.strokeStyle = cbHov ? '#ff4444' : '#3a6080';
  ctx.lineWidth  = 1;
  ctx.fillRect(CB_X, CB_Y, CB_W, CB_H);
  ctx.strokeRect(CB_X, CB_Y, CB_W, CB_H);
  ctx.font = '10px Orbitron, monospace';
  ctx.letterSpacing = '2px';
  ctx.textAlign = 'center';
  ctx.textBaseline = 'middle';
  ctx.fillStyle = cbHov ? '#ff4444' : '#3a6080';
  ctx.fillText('CLOSE', CB_X + CB_W / 2, CB_Y + CB_H / 2);
  ctx.letterSpacing = '0px';
  addHitRegion(CB_X, CB_Y, CB_W, CB_H, closeWeaponPicker);
  _bagDropZones.push({ x: _PK_X, y: _PK_Y, w: _PK_W, h: _PK_H });

  let yOff = 0, col = 0;
  _pickerHoverWeapon = null;
  _pickerHoverDef    = null;

  ctx.save();
  ctx.beginPath();
  ctx.rect(_PK_LIST_X, _PK_BODY_Y, _PK_LIST_W, _PK_BODY_H);
  ctx.clip();

  function flushRow() {
    if (col > 0) { yOff += _PK_CARD_H + _PK_CARD_GAP; col = 0; }
  }

  function drawCard(weapon, def, opts) {
    const { isRemove, isEquipped, cantAfford, isBuy, location, action, source } = opts || {};
    const cx = _PK_LIST_X + col * (_PK_CARD_W + _PK_CARD_GAP);
    const cy = _PK_BODY_Y + yOff - _pickerScrollY;
    col++;
    if (col >= _PK_CPR) { yOff += _PK_CARD_H + _PK_CARD_GAP; col = 0; }

    const visible = cy + _PK_CARD_H > _PK_BODY_Y && cy < _PK_BODY_Y + _PK_BODY_H;
    if (!visible) return;

    const hov = isHovered(cx, cy, _PK_CARD_W, _PK_CARD_H);
    if (hov && !cantAfford) { _pickerHoverWeapon = weapon; _pickerHoverDef = def; }

    const border = isRemove ? '#ff4444' : isEquipped ? '#00d4ff99' : (hov && !cantAfford) ? '#ffd700' : '#1a3048';
    const bg     = isRemove ? '#150808' : isEquipped ? '#07101a' : (hov && !cantAfford) ? '#0c1820' : '#080f18';

    ctx.save();
    if (cantAfford) ctx.globalAlpha = 0.4;
    else if (isEquipped) ctx.globalAlpha = 0.72;
    ctx.fillStyle = bg; ctx.strokeStyle = border; ctx.lineWidth = 1;
    ctx.fillRect(cx, cy, _PK_CARD_W, _PK_CARD_H);
    ctx.strokeRect(cx, cy, _PK_CARD_W, _PK_CARD_H);

    ctx.font = '22px monospace';
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    ctx.fillStyle = isRemove ? '#ff4444' : '#ffffff';
    ctx.fillText(def?.icon || (isRemove ? 'X' : '?'), cx + _PK_CARD_W / 2, cy + 21);

    ctx.save();
    ctx.beginPath(); ctx.rect(cx + 4, cy + 36, _PK_CARD_W - 8, 16); ctx.clip();
    ctx.font = '9px Orbitron, "Share Tech Mono", monospace';
    ctx.letterSpacing = '1px';
    ctx.textBaseline = 'middle';
    ctx.fillStyle = isRemove ? '#ff4444' : '#b8d8e8';
    ctx.fillText(isRemove ? 'REMOVE' : (def?.name || ''), cx + _PK_CARD_W / 2, cy + 44);
    ctx.restore();

    if (isEquipped) {
      ctx.save();
      ctx.fillStyle = 'rgba(0,212,255,0.18)';
      ctx.fillRect(cx + 4, cy + 4, _PK_CARD_W - 8, 14);
      ctx.font = '8px Orbitron, monospace';
      ctx.letterSpacing = '1px';
      ctx.textAlign = 'center';
      ctx.textBaseline = 'middle';
      ctx.fillStyle = '#7ecfff';
      ctx.fillText('EQUIPPED', cx + _PK_CARD_W / 2, cy + 11);
      ctx.restore();
    }

    const sub = isRemove ? 'free'
      : isBuy ? (cantAfford ? `Need ${def.cost - spendableCredits()}c` : `${def.cost}c`)
      : (location || '');
    ctx.save();
    ctx.beginPath(); ctx.rect(cx + 2, cy + 54, _PK_CARD_W - 4, 14); ctx.clip();
    ctx.font = '9px "Share Tech Mono", monospace';
    ctx.letterSpacing = '0px';
    ctx.textBaseline = 'middle';
    ctx.fillStyle = isBuy ? '#ffd700' : '#3a6080';
    ctx.fillText(sub, cx + _PK_CARD_W / 2, cy + 61);
    ctx.restore();
    ctx.restore();

    if (!cantAfford && action) addHitRegion(cx, cy, _PK_CARD_W, _PK_CARD_H, action);
    if (!cantAfford && weapon && !isRemove && !isBuy)
      _dragRegions.push({ x: cx, y: cy, w: _PK_CARD_W, h: _PK_CARD_H, weapon, source: source || null });
  }

  for (let i = 0; i < G.tower.weaponSlots; i++) {
    const w = G.weapons[i];
    if (!w) continue;
    const ii = i;
    drawCard(w, getWeaponDef(w), {
      location: `SOCKET ${i + 1}`,
      isEquipped: true,
      source: { type: 'slot', slotIndex: i },
      action: (equipMode && i !== _pickerSlot)
        ? () => { equipWeaponInstanceToSlot(_pickerSlot, G.weapons[ii].instanceId); }
        : null
    });
  }

  for (const w of (G.weaponInventory || [])) {
    const wRef = w;
    drawCard(w, getWeaponDef(w), {
      location: 'INVENTORY',
      source: { type: 'bag' },
      action: equipMode
        ? () => { equipWeaponInstanceToSlot(_pickerSlot, wRef.instanceId); }
        : null
    });
  }
  flushRow();

  if (equipMode) {
    for (const def of WEAPON_DEFS) {
      const ownedCount = countOwnedWeaponType(def.id);
      if (ownedCount >= MAX_WEAPONS_PER_TYPE) continue;
      const cantAfford = spendableCredits() < def.cost;
      const dRef = def;
      drawCard(null, def, {
        location: 'BUY', isBuy: true, cantAfford, ownedCount,
        action: cantAfford ? null : () => { buyAndEquipWeapon(_pickerSlot, dRef.id); }
      });
    }
    flushRow();
  }

  _pickerScrollMax = Math.max(0, yOff - _PK_BODY_H + 20);

  ctx.restore();

  const DX = _PK_DET_X, DY = _PK_BODY_Y, DH = _PK_BODY_H;
  ctx.fillStyle = '#050a10';
  ctx.strokeStyle = '#122030';
  ctx.lineWidth = 1;
  ctx.fillRect(DX, DY, _PK_DETAIL_W, DH);
  ctx.strokeRect(DX, DY, _PK_DETAIL_W, DH);

  if (_pickerHoverWeapon || _pickerHoverDef) {
    const hw = _pickerHoverWeapon, hd = _pickerHoverDef;
    let dy = DY + 10;
    ctx.font = '12px Orbitron, "Share Tech Mono", monospace';
    ctx.letterSpacing = '2px';
    ctx.textAlign = 'left';
    ctx.textBaseline = 'top';
    ctx.fillStyle = '#00d4ff';
    ctx.fillText((hd?.icon || '') + ' ' + (hd?.name || ''), DX + 10, dy);
    ctx.letterSpacing = '0px';
    dy += 28;
    ctx.font = '10px "Share Tech Mono", monospace';
    const elLabel = hw ? weaponElementLabel(hw) : '';
    if (elLabel) {
      ctx.fillStyle = '#3a6080'; ctx.textAlign = 'left';
      ctx.fillText('ELEMENTS', DX + 10, dy);
      ctx.fillStyle = '#b8d8e8'; ctx.textAlign = 'right';
      ctx.fillText(elLabel, DX + _PK_DETAIL_W - 10, dy);
      ctx.textAlign = 'left'; dy += 18;
    }
    for (const [k, v] of (hw ? weaponStatRows(hw) : [])) {
      if (dy > DY + DH - 18) break;
      ctx.strokeStyle = '#102030'; ctx.lineWidth = 1;
      ctx.beginPath();
      ctx.moveTo(DX + 8, dy + 16);
      ctx.lineTo(DX + _PK_DETAIL_W - 8, dy + 16);
      ctx.stroke();
      ctx.fillStyle = '#3a6080'; ctx.textAlign = 'left'; ctx.fillText(k, DX + 10, dy);
      ctx.fillStyle = '#b8d8e8'; ctx.textAlign = 'right'; ctx.fillText(String(v), DX + _PK_DETAIL_W - 10, dy);
      dy += 18;
    }
  } else {
    ctx.font = '11px Orbitron, monospace';
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    ctx.fillStyle = '#1a3048';
    ctx.fillText('Drag weapons into sockets', DX + _PK_DETAIL_W / 2, DY + DH / 2 - 10);
    ctx.fillText('or back into the bag', DX + _PK_DETAIL_W / 2, DY + DH / 2 + 10);
  }

  ctx.restore();
}