/* ISLE SLINGERS -- physics/abilities/index.js (submodule: abilities)
 * Modularization pass (behavior-neutral split of the original
 * js/core.js monolith). Installs its units into ONE shared physics scope `P`
 * that every physics submodule sees -- the same single-scope semantics the
 * monolith had. Must load before js/physics/index.js (the aggregator that
 * attaches the public ISLE_CORE API). Surface installed: launch, triggerAbility.
 */
(function (root, factory) {
  var part = factory();
  if (typeof module !== 'undefined' && module.exports) module.exports = part;
  else (root.ISLE_PHYSICS_PARTS = root.ISLE_PHYSICS_PARTS || []).push(part);
})(typeof globalThis !== 'undefined' ? globalThis : this, function () {
  'use strict';
  return function (P) {
  P.launch = function(g, dragPos) {
    var b = P.activeBird(g);
    if (!b || b.state !== 'aiming' || g.status !== 'ready') return false;
    var v = P.aimVector(g, { x: g.level.sling.x, y: g.level.sling.y }, dragPos);
    if (!v) return false;
    b.x = g.level.sling.x; b.y = g.level.sling.y;
    b.vx = v.vx; b.vy = v.vy;
    b.state = 'flying';
    b.launchT = g.time;
    g.status = 'flying';
    g.launched++;
    g.events.push({ type: 'P.launch', x: b.x, y: b.y });
    return true;
  }

  P.triggerAbility = function(g) {
    var b = P.activeBird(g);
    if (!b || b.state !== 'flying' || b.abilityUsed) return false;
    if (g.time - b.launchT < P.ABILITY_CD) return false;
    var kind = b.kind;
    if (kind === 'wren') {
      b.vx = b.vx * 0.4 + 980;
      g.events.push({ type: 'ability_fury', x: b.x, y: b.y });
    } else if (kind === 'zippy') {
      b.vy = Math.max(b.vy, 0) + 1050;
      b.vx *= 0.55;
      g.events.push({ type: 'ability_dive', x: b.x, y: b.y });
    } else if (kind === 'boulder') {
      var R = 150;
      var i, d, f, ent;
      for (i = 0; i < g.blocks.length; i++) {
        var bl = g.blocks[i];
        if (bl.hp <= 0) continue;
        d = Math.hypot(bl.x - b.x, bl.y - b.y) - (bl.w + bl.h) / 4;
        if (d < R) { f = 1 - Math.max(0, d) / R; P.damageBlock(g, bl, 120 + 300 * f, 'quake'); }
      }
      for (i = 0; i < g.enemies.length; i++) {
        ent = g.enemies[i];
        if (ent.dead) continue;
        d = Math.hypot(ent.x - b.x, ent.y - b.y) - ent.r;
        if (d < R) { f = 1 - Math.max(0, d) / R; P.damageEnemy(g, ent, 0.7 + 1.6 * f); }
      }
      g.camera.shake = Math.max(g.camera.shake, 14);
      g.events.push({ type: 'ability_quake', x: b.x, y: b.y, r: R });
    }
    b.abilityUsed = true;
    g.stats.abilityUses++;
    return true;
  }
  };
});