// ═══ renderer-tower.js ═══
// ============================================================
//  RENDERER TOWER — tower hardpoints and shields
// ============================================================

// ── TOWER ─────────────────────────────────────────────────────
function drawTower(x, y) {
  const t = G.frame;
  const hpRatio = G.tower.hp / G.tower.maxHp;
  const color = hpRatio > 0.5 ? '#00d4ff' : hpRatio > 0.25 ? '#ffd700' : '#ff3355';
  const pulse = 0.6 + 0.4 * Math.sin(t * 0.05);
  const totalSlots = Math.max(1, G.tower.weaponSlots);
  const hardpointOrbit = getHardpointOrbit(totalSlots);

  // Pulse ring
  ctx.strokeStyle = color + '44';
  ctx.lineWidth = 2;
  ctx.beginPath();
  ctx.arc(x, y, 36 + pulse * 4 + (hardpointOrbit - 20) * 0.45, 0, Math.PI*2);
  ctx.stroke();

  // Base chassis
  ctx.fillStyle = '#050a0e';
  ctx.strokeStyle = color;
  ctx.lineWidth = 2;
  ctx.beginPath(); ctx.arc(x, y, 24, 0, Math.PI*2); ctx.fill(); ctx.stroke();

  // Inner glow
  const grd = ctx.createRadialGradient(x, y, 0, x, y, 20);
  grd.addColorStop(0, color + '44');
  grd.addColorStop(1, 'transparent');
  ctx.fillStyle = grd;
  ctx.beginPath(); ctx.arc(x, y, 20, 0, Math.PI*2); ctx.fill();

  // Hardpoint ring
  ctx.strokeStyle = color + '2d';
  ctx.lineWidth = 1;
  ctx.setLineDash([5, 5]);
  ctx.beginPath();
  ctx.arc(x, y, hardpointOrbit, 0, Math.PI * 2);
  ctx.stroke();
  ctx.setLineDash([]);

  // Draw all unlocked mount sockets (filled when weapon installed)
  for (let slotIndex = 0; slotIndex < totalSlots; slotIndex++) {
    const mount = getSlotHardpoint(slotIndex, x, y, totalSlots);
    const installed = !!G.weapons[slotIndex];
    ctx.fillStyle = installed ? '#0d1f2a' : '#061018';
    ctx.strokeStyle = installed ? color + '88' : '#1a3240';
    ctx.lineWidth = installed ? 1.8 : 1.2;
    ctx.beginPath();
    ctx.arc(mount.x, mount.y, installed ? 5.4 : 4.2, 0, Math.PI * 2);
    ctx.fill();
    ctx.stroke();
  }

  // Weapon hardpoints and independent turrets
  const hardpoints = getWeaponHardpoints(x, y);
  ctx.shadowBlur = 7;
  for (const hp of hardpoints) {
    const w = hp.weapon;
    const def = getWeaponDef(w);
    if (!def) continue;

    const wColor = ELEMENTS[w.elements[0]]?.color || def.color || '#c8c8c8';
    const wGlow = ELEMENTS[w.elements[0]]?.glow || wColor;
    const aim = typeof w.aimAngle === 'number' ? w.aimAngle : hp.mountAngle;
    const barrelLen = getWeaponBarrelLength(w);
    const recoilPx = (w.recoil || 0) * 3.2;

    // Brace arm
    ctx.shadowBlur = 0;
    ctx.strokeStyle = '#10293a';
    ctx.lineWidth = 2;
    ctx.beginPath();
    ctx.moveTo(x, y);
    ctx.lineTo(hp.x, hp.y);
    ctx.stroke();

    // Mount cap
    ctx.fillStyle = '#07141d';
    ctx.strokeStyle = wColor;
    ctx.lineWidth = 1.5;
    ctx.beginPath();
    ctx.arc(hp.x, hp.y, 5.8, 0, Math.PI * 2);
    ctx.fill();
    ctx.stroke();

    // Turret barrel
    ctx.shadowBlur = 8;
    ctx.shadowColor = wGlow;
    ctx.fillStyle = wColor;
    ctx.save();
    ctx.translate(hp.x, hp.y);
    ctx.rotate(aim);
    const barrelDrawLen = Math.max(7, barrelLen - recoilPx);
    let flashX = barrelDrawLen + 2;
    let flashY = 0;

    switch (def.type) {
      case 'beam':
        ctx.fillRect(0, -3.2, barrelDrawLen, 1.9);
        ctx.fillRect(0, 1.3, barrelDrawLen, 1.9);
        ctx.fillStyle = '#9fe6ff';
        ctx.fillRect(barrelDrawLen - 3, -1.1, 3, 2.2);
        break;

      case 'cone':
        ctx.fillRect(0, -2.8, Math.max(7, barrelDrawLen * 0.58), 5.6);
        ctx.beginPath();
        ctx.moveTo(barrelDrawLen * 0.56, -4.6);
        ctx.lineTo(barrelDrawLen + 1, 0);
        ctx.lineTo(barrelDrawLen * 0.56, 4.6);
        ctx.closePath();
        ctx.fill();
        break;

      case 'mortar':
        ctx.fillRect(-1, -4.8, Math.max(6, barrelDrawLen * 0.72), 9.6);
        ctx.beginPath();
        ctx.arc(3, 0, 4.8, 0, Math.PI * 2);
        ctx.fill();
        ctx.fillStyle = '#dff6ff';
        ctx.fillRect(Math.max(6, barrelDrawLen * 0.7) - 2, -1.6, 2, 3.2);
        flashX = Math.max(6, barrelDrawLen * 0.72) + 1.5;
        break;

      case 'multi':
        ctx.fillRect(0, -4.2, barrelDrawLen, 2.6);
        ctx.fillRect(0, 1.6, barrelDrawLen, 2.6);
        ctx.fillStyle = '#dff6ff';
        ctx.fillRect(barrelDrawLen - 2, -4.1, 2, 2.4);
        ctx.fillRect(barrelDrawLen - 2, 1.7, 2, 2.4);
        break;

      case 'chain':
        ctx.fillRect(0, -2.7, barrelDrawLen - 1, 5.4);
        ctx.beginPath();
        ctx.moveTo(barrelDrawLen - 2, -2.7);
        ctx.lineTo(barrelDrawLen + 1.8, -4.8);
        ctx.lineTo(barrelDrawLen - 0.1, -0.7);
        ctx.closePath();
        ctx.fill();
        ctx.beginPath();
        ctx.moveTo(barrelDrawLen - 2, 2.7);
        ctx.lineTo(barrelDrawLen + 1.8, 4.8);
        ctx.lineTo(barrelDrawLen - 0.1, 0.7);
        ctx.closePath();
        ctx.fill();
        break;

      default:
        ctx.fillRect(0, -2.9, barrelDrawLen, 5.8);
        ctx.fillStyle = '#dff6ff';
        ctx.fillRect(barrelDrawLen - 2, -1.4, 2, 2.8);
        break;
    }

    if ((w.muzzleFlash || 0) > 0) {
      const flashAlpha = Math.min(1, w.muzzleFlash / 4);
      ctx.globalAlpha = flashAlpha;
      ctx.fillStyle = '#ffffff';
      ctx.beginPath();
      ctx.arc(flashX, flashY, 2.5 + flashAlpha * 2.5, 0, Math.PI * 2);
      ctx.fill();
      ctx.globalAlpha = 1;
    }
    ctx.restore();
  }
  ctx.shadowBlur = 0;

  // Center hub
  ctx.fillStyle = '#050a0e';
  ctx.strokeStyle = color;
  ctx.lineWidth = 2;
  ctx.beginPath(); ctx.arc(x, y, 10, 0, Math.PI*2); ctx.fill(); ctx.stroke();

  ctx.textAlign = 'left';
}

// ── SHIELD ────────────────────────────────────────────────────
function drawShield(x, y) {
  if (!G.tower.shield || G.tower.shieldHp <= 0) return;
  const alpha = G.tower.shieldHp / G.tower.shieldMaxHp;

  ctx.save();
  if (G.tower.shield === 'dome') {
    const grd = ctx.createRadialGradient(x, y, 20, x, y, 50);
    grd.addColorStop(0, 'transparent');
    grd.addColorStop(1, '#00d4ff');
    ctx.globalAlpha = 0.15 + alpha * 0.2;
    ctx.fillStyle = grd;
    ctx.beginPath(); ctx.arc(x, y, 46, 0, Math.PI*2); ctx.fill();
    ctx.globalAlpha = alpha * 0.7;
    ctx.strokeStyle = '#00d4ff'; ctx.lineWidth = 2;
    ctx.beginPath(); ctx.arc(x, y, 46, 0, Math.PI*2); ctx.stroke();

  } else if (G.tower.shield === 'directional') {
    const arc = G.tower.shieldArcWidth ?? (Math.PI * 0.6);
    const angle = G.tower.shieldAngle;
    ctx.globalAlpha = alpha * 0.7;
    ctx.fillStyle = '#00d4ff22';
    ctx.beginPath();
    ctx.moveTo(x, y);
    ctx.arc(x, y, 50, angle - arc/2, angle + arc/2);
    ctx.closePath(); ctx.fill();
    ctx.strokeStyle = '#00d4ff'; ctx.lineWidth = 3;
    ctx.beginPath();
    ctx.arc(x, y, 50, angle - arc/2, angle + arc/2);
    ctx.stroke();
  }
  ctx.restore();
}