/* ==================== THREAT SCORING ==================== */
function getThreatScore(d) {
const cx = canvas.width / 2;
const cy = canvas.height / 2;

let dx = d.x - cx;
let dy = d.y - cy;
let distance = Math.max(1, Math.sqrt(dx*dx + dy*dy));

let speed = Math.sqrt(d.vx * d.vx + d.vy * d.vy);

let swarmRadius = 50 + wave * 8;
let swarm = drones.filter(o =>
o !== d && Math.hypot(o.x - d.x, o.y - d.y) < swarmRadius
).length;

let dirToCenterX = -dx / distance;
let dirToCenterY = -dy / distance;
let alignment = (d.vx * dirToCenterX + d.vy * dirToCenterY);
let directionBonus = Math.max(0, alignment) * 35;

let altitudeFactor = d.altitude === "Low" ? 68 :
(d.altitude === "Medium" ? 32 : 12);

let patternBonus = 0;
if (d.pattern === "Fast Rush") patternBonus = 45;
else if (d.pattern === "Erratic") patternBonus = 38;
else if (d.pattern === "Sneaky Slow") patternBonus = 15;

let targetingCount = interceptors.filter(i => i.target === d).length;
let multiTargetBonus = targetingCount * 22;

let rawScore =
(1 / distance) * 140 +
speed * 52 +
swarm * 28 +
directionBonus +
altitudeFactor +
patternBonus +
multiTargetBonus;

let normalized = Math.min(100, Math.round(rawScore / 4.5));

return {
raw: Math.round(rawScore),
normalized: normalized,
altitude: d.altitude,
speed: Math.round(speed * 10) / 10,
pattern: d.pattern
};
}