// ═══ portals.js ═══
// ============================================================
//  PORTALS — portal spawning and lifecycle
// ============================================================

const PORTAL_COUNT = 3;
const PORTAL_OPEN_TIME = 180;
const PORTAL_COOLDOWN_MIN = 300;
const PORTAL_COOLDOWN_MAX = 600;
const PORTAL_SPAWN_INTERVAL = 18;
const PORTAL_RADIUS = ARENA_RADIUS - 32;

function splitInteger(total, parts) {
  const base = Math.floor(total / parts);
  let remainder = total - base * parts;
  const out = [];
  for (let i = 0; i < parts; i++) {
    out.push(base + (remainder > 0 ? 1 : 0));
    if (remainder > 0) remainder--;
  }
  return out;
}

// ── PORTAL MANAGEMENT ─────────────────────────────────────────
function updatePortals() {
  // Tick existing portals
  for (const p of G.portals) {
    p.life--;
    p.angle += 0.02;

    // Spawn enemies from open portals
    if (p.spawnQueue.length > 0 && p.life > 0) {
      // For swarm portals: burst spawn all at once in a ring
      if (p.isBurst && p.spawnTimer <= 0) {
        const total = p.spawnQueue.length;
        p.spawnQueue.forEach((entry, i) => {
          const angle = (i / total) * Math.PI * 2;
          if (entry?.def) {
            spawnEnemy(entry.def, p.x, p.y, entry.reward, angle, entry.cost, entry.breachRiskMult);
          }
        });
        p.spawnQueue = [];
      } else {
        p.spawnTimer--;
        if (p.spawnTimer <= 0 && !p.isBurst) {
          p.spawnTimer = PORTAL_SPAWN_INTERVAL;
          const entry = p.spawnQueue.shift();
          if (entry?.def) {
            spawnEnemy(entry.def, p.x, p.y, entry.reward, null, entry.cost, entry.breachRiskMult);
          }
        }
      }
    }
  }

  compactLiveArray(G.portals, p => p.life > 0);
}

function openPortal(enemyDef, count = 1, rewardPerUnit = null, isBurst = false, costPerUnit = null, breachRiskMult = 1, rewardSequence = null, fixedAngle = null) {
  const cx = ARENA_CX, cy = ARENA_CY;

  let x, y, angle, attempts = 0;
  do {
    angle = fixedAngle !== null ? fixedAngle : Math.random() * Math.PI * 2;
    x = cx + Math.cos(angle) * PORTAL_RADIUS;
    y = cy + Math.sin(angle) * PORTAL_RADIUS;
    attempts++;
  } while (attempts < 20 && fixedAngle === null && G.portals.some(p => distSq(p.x, p.y, x, y) < 80 * 80));

  const queue = [];
  for (let i = 0; i < count; i++) {
    const reward = Array.isArray(rewardSequence) ? rewardSequence[i] : rewardPerUnit;
    queue.push({ def: enemyDef, reward, cost: costPerUnit, breachRiskMult });
  }

  G.portals.push({
    id: uid(),
    x, y,
    life: PORTAL_OPEN_TIME + (isBurst ? 10 : count * PORTAL_SPAWN_INTERVAL),
    maxLife: PORTAL_OPEN_TIME + (isBurst ? 10 : count * PORTAL_SPAWN_INTERVAL),
    angle: Math.random() * Math.PI * 2,
    spawnQueue: queue,
    spawnTimer: 30,
    isBurst,
    defId: enemyDef.id,
    color: enemyDef.color,
  });
  sfx_portal_open();
}