/* ISLE SLINGERS -- physics/state/index.js (submodule: state)
 * 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: createGame, makeBird, activeBird.
 */
(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.createGame = function(levelDef) {
    var g = {
      level: levelDef,
      world: { w: P.WORLD.w, ground: P.WORLD.ground },
      time: 0,
      score: 0,
      birds: [],
      blocks: [],
      enemies: [],
      events: [],          // visual/audio events for the renderer
      scorePopups: [],     // {x,y,text,age}
      hadEnemies: levelDef.enemies.length > 0,
      camera: { x: levelDef.sling.x + 260, y: 560, zoom: 1, shake: 0, snap: true },
      status: 'ready',     // ready | flying | won | lost
      activeBird: -1,
      launched: 0,
      wonAt: null,
      lostAt: null,
      stats: { impacts: 0, destroyedBlocks: 0, destroyedEnemies: 0, abilityUses: 0, distance: 0 }
    };
    g.blocks = levelDef.blocks.map(function (b, i) {
      var m = P.MATERIALS[b.mat];
      return {
        id: i, x: b.x, y: b.y, w: b.w, h: b.h, mat: b.mat,
        hp: m.hp, maxHp: m.hp,
        vx: 0, vy: 0, rest: 1,
        // S-3 rotational degree of freedom (topple). ang/angVel stay 0 for
        // every supported stack, so pre-S-3 motion is preserved exactly.
        ang: 0, angVel: 0, pivoting: false,
        mass: m.density * b.w * b.h / 1400
      };
    });
    g.enemies = levelDef.enemies.map(function (e, i) {
      var t = P.ENEMY_TYPES[e.kind];
      // level data y is the CENTER (the level-integrity test treats it the
      // same way); spawning at e.y - r made every enemy drop 24-38px on
      // load — a visible "objects moving on their own" wobble at start
      return {
        id: i, kind: e.kind, x: e.x, y: e.y, r: t.r,
        hp: t.hp, maxHp: t.hp, vx: 0, vy: 0, rest: 1, dead: false, deathAge: 0
      };
    });
    var i;
    for (i = 0; i < levelDef.birds.length; i++) {
      g.birds.push(P.makeBird(levelDef.birds[i], i));
    }
    g.activeBird = g.birds.length ? 0 : -1;
    if (g.activeBird >= 0) {
      var fb = g.birds[0];
      fb.state = 'aiming';
      fb.x = levelDef.sling.x;
      fb.y = levelDef.sling.y;
    }
    return g;
  }

  P.makeBird = function(kind, idx) {
    var t = P.BIRD_TYPES[kind];
    return {
      id: idx, kind: kind, r: t.r, mass: t.mass,
      x: 0, y: 0, vx: 0, vy: 0,
      state: 'queued',      // queued | aiming | flying | spent
      abilityUsed: false,
      settleTimer: 0, age: 0,
      launchT: 0
    };
  }

  P.activeBird = function(g) { return g.activeBird >= 0 ? g.birds[g.activeBird] : null; }
  };
});