/**
 * Neutral-escort test (dev tool — run in Node, no browser):
 *
 *   node dev/neutral.test.mjs
 *
 * The player-side half of the combat layer, against a stub scene:
 * the escort's spawn (the allies roster, side 'player', frames 20–27),
 * the escort/engage/break state machine (the 10–15 s window → break-off),
 * the player-safety rules (never fires at the player, excluded from
 * auto-fire, bolts don't hit either way), the mixed fight (they lance
 * the nearest pirate — the kill still banks the pirate's XP; a pirate's
 * bolt can drop them, and that loss banks none), and the pirate-target
 * generalization (player preferred in range, nearest in-range escort
 * otherwise, classic chase unchanged).
 *
 * Every number comes from the real data/*.json (data/combat.json
 * included), so the assertions track the shipped config, not a private
 * copy.
 */
import { pathToFileURL } from 'node:url';
import { fileURLToPath } from 'node:url';
import { dirname, join } from 'node:path';

const __dirname = dirname(fileURLToPath(import.meta.url));

// A mirror of the vendored build's Angle.Wrap (Wrap(v, -π, π)).
const wrap = (a) => {
  const min = -Math.PI;
  const range = Math.PI * 2;
  return (((a - min) % range) + range) % range + min;
};

class V2 {
  constructor(x = 0, y = 0) { this.x = x; this.y = y; }
  set(x, y) { this.x = x; this.y = y; return this; }
  length() { return Math.hypot(this.x, this.y); }
  scale(s) { this.x *= s; this.y *= s; return this; }
}

class Sprite {
  constructor(scene, x, y, key, frame) {
    this.scene = scene; this.x = x; this.y = y; this.key = key; this.frame = frame;
    this.rotation = 0; this.scale = 1; this.alpha = 1; this.visible = true;
    this.active = true; this.body = null;
  }
  setScale(s) { this.scale = s; return this; }
  setTint() { return this; }
  setBlendMode() { return this; }
  setDepth() { return this; }
  setOrigin() { return this; }
  setAlpha(a) { this.alpha = a; return this; }
  setVisible(v) { this.visible = v; return this; }
  destroy() { this.active = false; this.destroyed = true; }
}

function makeBody() {
  return {
    velocity: new V2(),
    acceleration: new V2(),
    enable: true,
    setCircle() { return this; },
    setAllowGravity() { return this; },
    setVelocity(x, y) { this.velocity.set(x, y); return this; },
  };
}

const PhaserStub = {
  Physics: { Arcade: { Sprite } },
  Math: {
    Angle: {
      Wrap: wrap,
      RotateTo: (cur, tgt, step) =>
        Math.abs(wrap(tgt - cur)) <= step ? tgt : cur + Math.sign(wrap(tgt - cur)) * step,
    },
  },
  Display: { Color: { ValueToColor: (v) => ({ color: parseInt(String(v).replace('#', ''), 16) }) } },
  BlendModes: { ADD: 'ADD' },
};
globalThis.window = { Phaser: PhaserStub }; // js/vendor/phaser.js reads this

function makeImg(x = 0, y = 0, key = '__dot') {
  return {
    x, y, key, scale: 1, alpha: 1, visible: true, active: true,
    setScale(s) { this.scale = s; return this; },
    setAlpha(a) { this.alpha = a; return this; },
    setTint() { return this; },
    setBlendMode() { return this; },
    setDepth() { return this; },
    setAngle() { return this; },
    setVisible(v) { this.visible = v; return this; },
    destroy() { this.active = false; this.destroyed = true; },
  };
}

function makeGraphics() {
  return {
    visible: true,
    clear() { return this; },
    lineStyle() { return this; },
    fillStyle() { return this; },
    lineBetween() { return this; },
    fillCircle() { return this; },
    fillTriangle() { return this; },
    setScrollFactor() { return this; },
    setDepth() { return this; },
    setVisible(v) { this.visible = v; return this; },
    destroy() { this.destroyed = true; },
  };
}

function makeTextObj() {
  return {
    text: '', alpha: 0, visible: true,
    setText(t) { this.text = String(t); return this; },
    setAlpha(a) { this.alpha = a; return this; },
    setVisible(v) { this.visible = v; return this; },
    setOrigin() { return this; },
    setScrollFactor() { return this; },
    setDepth() { return this; },
    destroy() { this.destroyed = true; },
  };
}

function makeRectObj(x = 0, y = 0, w = 0, h = 0, alpha = 0) {
  return {
    x, y, width: w, height: h, alpha, visible: true,
    setAlpha(a) { this.alpha = a; return this; },
    setVisible(v) { this.visible = v; return this; },
    setOrigin() { return this; },
    setScrollFactor() { return this; },
    setDepth() { return this; },
    destroy() { this.destroyed = true; },
  };
}

function makeScene({ withSheet = true } = {}) {
  return {
    textures: { exists: () => withSheet },
    make: { graphics: () => ({ fillStyle() {}, beginPath() {}, moveTo() {}, lineTo() {}, closePath() {}, fillPath() {}, fillCircle() {}, generateTexture() {}, destroy() {} }) },
    add: {
      existing: (o) => o,
      image: (x, y, key) => makeImg(x, y, key),
      graphics: () => makeGraphics(),
      text: (x, y, s) => makeTextObj(),
      rectangle: (x, y, w, h, c, a) => makeRectObj(x, y, w, h, a ?? 0),
    },
    physics: { add: { existing: (o) => { o.body = makeBody(); return o; } } },
    scale: { width: 1280, height: 720 },
    time: { now: 0 },
  };
}

// The real data/*.json (the combat numbers come from data/combat.json).
const { config } = await import(pathToFileURL(join(__dirname, '../js/config/Config.js')).href);
const fs = await import('node:fs');
const dataDir = join(__dirname, '../data');
const configData = {};
for (const f of fs.readdirSync(dataDir)) {
  if (!f.endsWith('.json') || f === 'manifest.json') continue;
  configData[f.replace(/\.json$/i, '')] = JSON.parse(fs.readFileSync(join(dataDir, f), 'utf8'));
}
config.init(configData);
console.log('config loaded from data/:', Object.keys(configData).join(', '));

const { neutralTypeConfig, neutralTypeIds } = await import(
  pathToFileURL(join(__dirname, '../js/combat/EnemyTypes.js')).href
);
const { firePattern, missilesHitPlayer } = await import(
  pathToFileURL(join(__dirname, '../js/combat/Weapons.js')).href
);
const { CombatSystem } = await import(
  pathToFileURL(join(__dirname, '../js/combat/CombatSystem.js')).href
);

let failures = 0;
const check = (label, cond) => {
  console.log(`${cond ? '✔' : '✘ FAIL'}  ${label}`);
  if (!cond) failures++;
};

// A fresh harness per block: stub scene + player + real CombatSystem.
function harness(o = {}) {
  const scene = makeScene();
  const ship = new PhaserStub.Physics.Arcade.Sprite(scene, 0, 0, '__ship', 0);
  scene.physics.add.existing(ship);
  ship.radius = 12;
  ship.stop = () => {};
  const activeFlips = [];
  const combat = new CombatSystem(scene, {
    ship,
    onActiveChange: (a) => activeFlips.push(a),
    onComm: typeof o.onComm === 'function' ? o.onComm : null,
  });
  return { scene, ship, combat, activeFlips };
}

const ids = neutralTypeIds();

// ---------------------------------------------------------------- roster + escort
{
  const { ship, combat, activeFlips } = harness();
  const base = config.section('combat.neutral', {});
  check('config: the escort window is data (neutral.escortMin/escortMax = 10–15 s)',
    base.escortMin === 10 && base.escortMax === 15);

  const a0 = combat.spawnAlly(300, 0, 0, 'courier', { escortMs: 5000, viewFn: () => null });
  check("spawn: lands in the system's allies roster (not in enemies)",
    combat.allies.length === 1 && combat.enemies.length === 0 && combat.allies[0] === a0);
  check('spawn: player-side (side "player" — the roster contract)', a0.side === 'player' && !a0.dead);
  check('spawn: frame within 20–27 (the neutral-ship sheet)', a0.frame >= 20 && a0.frame <= 27);
  check('active: a live escort keeps combat lit', combat.active === true);

  const a1 = combat.spawnAlly(-300, 0, 1, 'runner', { viewFn: () => null });
  check('spawn: per-ship escort window rolls inside the data band (10–15 s)',
    a1.escortMs >= base.escortMin * 1000 - 1 && a1.escortMs <= base.escortMax * 1000 + 1);

  // Escort (no pirates): never fires, never aims at the player.
  a0.x = 80; a0.y = 0;
  let fired = false;
  for (let t = 1000; t <= 4000; t += 16) {
    a0.body.velocity.set(0, 0);
    const r = a0.update(t, 16, ship, []);
    if (r.wantsFire) fired = true;
  }
  check('escort: never aims at the player (3 s window — no volley, no target)',
    !fired && a0.target === null && a0.state === 'escort');
  check('escort: no "ally" bolts ever leave the barrel', combat.bullets.length === 0);

  // Break-off: window elapses → peel away from the player.
  a0.x = 120; a0.y = 0;
  a0.state = 'escort';
  a0.escortMs = 1000;
  a0.escortStart = 0;
  a0.update(2000, 16, ship, []);
  check('break: the escort window elapses into the break-off', a0.state === 'break');
  a0.body.velocity.set(0, 0);
  a0.update(2016, 16, ship, []);
  check('break: flies OFF (away from the player, not back to the ring)', a0.body.velocity.x > 0);

  // Despawn: broken escorts fully off-screen are collected; when the
  // last one is gone, combat is over.
  a0.gone = true;
  a1.gone = true;
  combat.update(90000, 16);
  check('despawn: broken escorts off-screen are collected (encounter ends)',
    combat.allies.length === 0);
  check('active: over when the last escort is off-screen', combat.active === false);
  // The seam the scene hangs the deck/soundtrack swap on (GameScene
  // _setCombatBar — combat bar out, normal deck + deep-space music back)
  // must fire on the break-off cull, not only on a kill.
  check('seam: onActiveChange flips true→false when the last escort leaves the screen',
    JSON.stringify(activeFlips) === '[true,false]');
}

// ---------------------------------------------------------------- the scan comms
{
  // The NEUTRAL PILOT's comms (data/comms.json → neutralScan /
  // neutralScanComplete): armed by the system, delivered through the
  // onComm seam — once per encounter, and only while the roster is
  // neutral-only (zero hostiles).
  const comms = [];
  const { ship, combat } = harness({ onComm: (t) => comms.push(t) });
  const a = combat.spawnAlly(300, 0, 0, 'courier', { escortMs: 60000, viewFn: () => null });
  check('seam: a neutral-only encounter stands (active + the neutral flag)',
    combat.active === true && combat._neutral === true && combat._neutralOnly() === true);
  a.state = 'escort'; // skip the stream-in (approach)
  a.x = 80; a.y = 0;
  combat.update(1000, 16);
  check('scan: the first on-screen moment arms the scan comm (once)',
    JSON.stringify(comms) === '["neutralScan"]');
  combat.update(1016, 16); // no barrage on the next frames
  check('scan: the mark holds — no repeat arm', JSON.stringify(comms) === '["neutralScan"]');
  // The break-off (escort window lapsed) arms the scan-complete comm.
  a.escortMs = 1000; a.escortStart = 0;
  combat.update(2000, 16);
  check('break: window elapse → break-off', a.state === 'break');
  check('scan-complete: the break-off arms the completion comm (once)',
    JSON.stringify(comms) === '["neutralScan","neutralScanComplete"]');

  // A live hostile anywhere keeps the roster MIXED: no neutral flag, no
  // scan comm (the pilot's line is a neutral-only beat).
  const comms2 = [];
  const h2 = harness({ onComm: (t) => comms2.push(t) });
  const b = h2.combat.spawnEnemy(400, 0, 0, 'raider');
  b.respawn = false; b.nextFireAt = Infinity; b.comms = null; // hold it + no pirate line
  const a2 = h2.combat.spawnAlly(300, 0, 1, 'runner', { escortMs: 60000, viewFn: () => null });
  a2.state = 'escort'; a2.x = 80; a2.y = 0;
  h2.combat.update(1000, 16);
  check('mixed: a live hostile keeps the neutral flag down + the scan comm silent',
    h2.combat._neutral === false && comms2.length === 0);
  // …and the moment the last hostile goes down (escorts still escorting)
  // the roster RE-RESOLVES to neutral: the seam re-fires with the flag.
  b.damage(999); // the real path is a tracer sweep → damage() → killEnemy
  h2.combat.killEnemy(b, 1000);
  check('mixed→neutral: the last kill re-fires the seam with neutral up',
    h2.combat.active === true && h2.combat._neutral === true);
}

// ---------------------------------------------------------------- engage
{
  const { ship, combat } = harness();
  const b = combat.spawnEnemy(200, 60, 0, 'raider');
  const c = combat.spawnEnemy(300, 150, 1, 'raider');
  b.respawn = false; c.respawn = false;
  b.nextFireAt = Infinity; c.nextFireAt = Infinity; // hold them for the test window
  const a = combat.spawnAlly(100, 0, 2, 'runner', { escortMs: 60000, viewFn: () => null });
  a.state = 'engage'; // skip the stream-in (approach is covered above)

  // Run the system (on-screen gate + shared dispatch) until the escort
  // has locked the nearest pirate and fired.
  let fired = false;
  for (let t = 1000; t <= 30000; t += 16) {
    combat.update(t, 16);
    if (a.target === b && combat.bullets.some((x) => x.owner === 'ally')) { fired = true; break; }
  }
  check('engage: lances the NEAREST pirate (an "ally" bolt leaves the barrel)',
    fired && a.target === b);
  check('no friendly fire: the player never takes escort bolts',
    combat.hull === combat.maxHull && combat.shields === combat.maxShields);

  // The direct seam: an ally bolt crossing the player's seat. (Headless
  // has no physics world, so the test advances the tracer itself.)
  combat.bullets.length = 0;
  const ab = combat.spawnBullet(-30, 0, 0, { bulletSpeed: 300, damage: 9, bulletLife: 5, color: '#37e0a1' }, 'ally');
  for (let i = 0; i < 30 && !ab.dead; i++) { ab.x += ab.body.velocity.x * 0.016; combat.update(31000 + i * 16, 16); }
  check('no friendly fire: the collide pass skips "ally" bolts at the player',
    combat.hull === combat.maxHull && combat.shields === combat.maxShields);
}

// ---------------------------------------------------------------- auto-fire
{
  const { ship, combat } = harness();
  const a = combat.spawnAlly(0, 100, 0, 'sloop', { escortMs: 60000, viewFn: () => null });
  a.state = 'escort';
  a.x = 0; a.y = 100;

  check('auto-fire: the escort is outside the cannon target pool (no lock when escort-only)',
    combat.currentTarget() === null);

  const b = combat.spawnEnemy(200, 60, 1, 'raider');
  b.respawn = false;
  b.nextFireAt = Infinity;
  check('auto-fire: the lock sits on the pirate, never the escort', combat.currentTarget() === b);

  // The player's bolts pass straight through the escort (no hit). (The
  // headless harness advances the tracer by its own velocity.)
  const pb = combat.spawnBullet(0, 140, -Math.PI / 2, { bulletSpeed: 300, damage: 20, bulletLife: 5, color: '#00e5ff' }, 'player');
  for (let i = 0; i < 30; i++) {
    if (pb.dead) break;
    pb.x += pb.body.velocity.x * 0.016;
    pb.y += pb.body.velocity.y * 0.016;
    combat.update(2000 + i * 16, 16);
  }
  check('no friendly fire: player bolts pass through the escort (no damage)',
    a.hull === a.maxHull && a.shields === a.maxShields);
}

// ---------------------------------------------------------------- pirate targeting
{
  const { ship, combat } = harness();
  const a = combat.spawnAlly(150, 0, 0, 'sentinel', { escortMs: 60000, viewFn: () => null });
  a.state = 'escort';
  const d = combat.spawnEnemy(300, 0, 1, 'raider');
  d.respawn = false;
  d.nextFireAt = Infinity;

  // The player is within the pirate's weapon range — the player is
  // preferred, even with a nearer escort.
  check('pirate targeting: player preferred in range (even with a nearer escort)',
    combat.pickEnemyTarget(d, ship) === ship);

  // The player is out of range; the escort is in range → the escort
  // draws aggro.
  ship.x = 1000; ship.y = 0;
  a.x = 250; a.y = 0;
  check('pirate targeting: out of player range, the nearest in-range escort draws aggro',
    combat.pickEnemyTarget(d, ship) === a);

  // No escort in reach → the classic player chase (pirates-only
  // unchanged).
  const saved = combat.allies;
  combat.allies = [];
  check('pirate targeting: with no escort in reach, the classic chase stands',
    combat.pickEnemyTarget(d, ship) === ship);
  combat.allies = saved;

  // The pirate AI actually fires at the escort (the same gate that
  // fires at the player — in range, aimed, off cooldown).
  ship.x = 0; ship.y = 0;
  d.x = 300; d.y = 0;
  d.rotation = -Math.PI / 2; // heading = rotation - artOffset → facing west (art faces north)
  d.nextFireAt = 0;
  const w = d.update(1000, 16, a);
  check('pirate targeting: aimed + in range, the pirate lances the escort', w === true);

  // And the escort takes the hit (the new collide pass — the headless
  // harness advances the tracer by its own velocity).
  a.x = 0; a.y = 100;
  const eb = combat.spawnBullet(-40, 100, 0, { bulletSpeed: 300, damage: 9, bulletLife: 5, color: '#ff2d6f' }, 'enemy');
  const shB = a.shields, huB = a.hull;
  for (let i = 0; i < 30; i++) { if (eb.dead) break; eb.x += eb.body.velocity.x * 0.016; combat.update(2000 + i * 16, 16); }
  check('mixed: a pirate bolt that strikes the escort lands damage',
    a.shields < shB || a.hull < huB || a.dead);
}

// ---------------------------------------------------------------- escort's loss
{
  const { ship, combat } = harness();
  const a = combat.spawnAlly(0, 100, 0, 'sally', { escortMs: 60000, viewFn: () => null });
  a.state = 'escort';
  a.x = 0; a.y = 100;

  const xpB = combat.xp.xp;
  // A fatal pirate bolt: the escort is pulled out of the world — and
  // that loss banks no XP (the bounty is the pirate's).
  const eb = combat.spawnBullet(-40, 100, 0, { bulletSpeed: 300, damage: 999, bulletLife: 5, color: '#ff2d6f' }, 'enemy');
  for (let i = 0; i < 20; i++) { if (eb.dead) break; eb.x += eb.body.velocity.x * 0.016; combat.update(1000 + i * 16, 16); }
  combat.update(1000 + 20 * 16 + 16, 16); // flush the cull
  check('mixed: a shot-down escort is collected (out of the allies roster)',
    a.dead && !combat.allies.includes(a));
  check('mixed: a shot-down escort banks no XP (the bounty is the pirate)', combat.xp.xp === xpB);
}

{
  const { ship, combat } = harness();
  const d = combat.spawnEnemy(400, 0, 0, 'raider');
  d.respawn = false;
  d.nextFireAt = Infinity;
  const xpB = combat.xp.xp;

  // An escort bolt across the pirate: one kill path — the XP still
  // lands.
  const ab = combat.spawnBullet(380, 0, 0, { bulletSpeed: 300, damage: 999, bulletLife: 5, color: '#37e0a1' }, 'ally');
  for (let i = 0; i < 20; i++) { if (ab.dead) break; ab.x += ab.body.velocity.x * 0.016; combat.update(1000 + i * 16, 16); }
  const gained = Number(config.get('combat.enemy.xp', 0)) || 10;
  check('mixed: an escort kill still banks the pirate XP (one grant)',
    d.dead === true && combat.xp.xp - xpB >= gained);
}

// ---------------------------------------------------------------- seekers
{
  const { ship, combat } = harness();
  const heraldId = neutralTypeIds().find((id) => neutralTypeConfig(id).weapon.pattern === 'missile');
  check('roster: the neutral roster carries a missile-pattern craft', !!heraldId);
  const a = combat.spawnAlly(0, 0, 0, heraldId, { escortMs: 60000, viewFn: () => null });
  a.state = 'engage';
  const d = combat.spawnEnemy(300, 0, 1, 'raider');
  d.respawn = false;
  d.nextFireAt = Infinity;

  // Fire the seeker (the herald's gate is the same honesty as the rest).
  a.rotation = Math.PI / 2; // heading = rotation - artOffset → facing east (art faces north)
  a.nextFireAt = 0;
  const w = a.update(1000, 16, ship, combat.enemies);
  check('escort seeker: engaged + aimed, the herald lances the pirate',
    w.wantsFire === true && w.target === d);
  combat.fireAlly(a, d, 1000);
  const m = combat.missiles.find((x) => x.owner === 'ally');
  check('escort seeker: the seeker carries the "ally" owner + its victim lock',
    !!m && m.owner === 'ally' && m.targetRef === d);

  // Homing: the lock moves → the seeker curves to the new bearing.
  d.x = 400; d.y = 120;
  const h0 = m.heading;
  for (let i = 0; i < 12 && !m.dead; i++) m.update(16, d);
  check('escort seeker: the seeker homes on the (moved) pirate', Math.abs(m.heading - h0) > 0.1);

  // No friendly fire: an escort seeker crossing the player's seat
  // misses.
  m.dead = false;
  m.x = ship.x + 4; m.y = ship.y;
  m.heading = 0;
  const hullB = combat.hull, shB = combat.shields;
  missilesHitPlayer(combat, ship, 12, 16);
  check('escort seeker: "ally" seekers never strike the player',
    m.dead === false && combat.hull === hullB && combat.shields === shB);

  // A hostile seeker can drop the escort (the mixed-encounter threat).
  const hunter = config.section('combat.enemyTypes.hunter', {});
  const fake = { x: -100, y: 0, rotation: 0 };
  firePattern(combat, fake, a, { ...hunter.weapon });
  const em = combat.missiles.find((x) => x.owner === 'enemy');
  check('hostile seeker: the pirate fires one too (the shared dispatch)', !!em);
  if (em) {
    // Keep the escort OFF the player's seat (the hostile seeker's first
    // test in the collide order is the player's).
    a.x = 200; a.y = 60;
    em.dead = false;
    em.x = a.x + 2; em.y = a.y;
    const aShB = a.shields, aHuB = a.hull;
    combat.update(3000, 16);
    check('hostile seeker: a pirate seeker can drop the escort (new pass)',
      a.shields < aShB || a.hull < aHuB || a.dead);
  }
}

// ---------------------------------------------------------------- verdict
console.log('');
if (failures === 0) console.log('✔ ALL NEUTRAL-ESCORT TESTS PASSED');
else {
  console.log(`✘ ${failures} NEUTRAL-ESCORT TEST(S) FAILED`);
  process.exitCode = 1;
}