/**
 * rigging.selftest.js — assert suite for the prep-phase economy.  [Lane B]
 *
 * Same shape as sail.selftest.js: DOM-free, three-free, runs under node today
 * and imports cleanly into Lane A's selftest.html later.
 */

import { RiggingSession, START_BUDGET, SPARE_COST } from './rigging.js';
import { SailRig, HARDWARE, TENSION_MIN, TENSION_MAX } from './sail.js';

const [CARABINER, SHACKLE, RATED] = HARDWARE;

// A yard-ish spread of anchors: house edge, two trees, two posts, at the sort
// of heights PLAN3D's world will actually offer.
const ANCHORS = [
  { id: 'h1', type: 'house', pos: { x: -3, y: 3.0, z: -6 } },
  { id: 'h2', type: 'house', pos: { x: 3, y: 3.0, z: -6 } },
  { id: 't1', type: 'tree', pos: { x: -5, y: 4.4, z: 1 } },
  { id: 't2', type: 'tree', pos: { x: 5, y: 4.1, z: 2 } },
  { id: 'p1', type: 'post', pos: { x: -4, y: 2.6, z: 5 } },
  { id: 'p2', type: 'post', pos: { x: 4, y: 2.6, z: 5 } },
];

const session = () => new RiggingSession({ anchors: ANCHORS });

const results = [];
function test(name, fn) {
  try {
    const detail = fn();
    results.push({ name, pass: true, detail: detail || '' });
  } catch (e) {
    results.push({ name, pass: false, detail: e.message });
  }
}
function assert(cond, msg) {
  if (!cond) throw new Error(msg);
}

export function runRiggingSelftest() {
  results.length = 0;

  test('rigging four corners charges the cheapest hardware each', () => {
    const s = session();
    for (const id of ['h1', 'h2', 'p1', 'p2']) assert(s.rig(id).ok, `rig ${id} failed`);
    assert(s.budget === START_BUDGET - 4 * CARABINER.cost, `budget $${s.budget}`);
    assert(s.canStart, 'four corners should be startable');
    return `$${START_BUDGET} -> $${s.budget} after four carabiners`;
  });

  test('a sail has four corners, not five', () => {
    const s = session();
    for (const id of ['h1', 'h2', 'p1', 'p2']) s.rig(id);
    const r = s.rig('t1');
    assert(!r.ok && r.reason === 'a sail has four corners', `fifth corner allowed: ${JSON.stringify(r)}`);
    assert(s.budget === START_BUDGET - 4 * CARABINER.cost, 'refused corner should not be charged');
    return 'fifth pick refused and not charged';
  });

  test('hardware cycles up, charging only the difference', () => {
    const s = session();
    s.rig('h1');
    assert(s.cycleHardware('h1').ok, 'cycle to shackle failed');
    assert(s.pickOf('h1').hw === SHACKLE, 'expected shackle');
    assert(s.budget === START_BUDGET - SHACKLE.cost, `budget $${s.budget} should be $${START_BUDGET - SHACKLE.cost}`);
    s.cycleHardware('h1');
    assert(s.pickOf('h1').hw === RATED, 'expected rated shackle');
    assert(s.budget === START_BUDGET - RATED.cost, `budget $${s.budget}`);
    return `carabiner -> shackle -> rated, paid $${RATED.cost} total`;
  });

  test('cycling past the top tier wraps and refunds', () => {
    const s = session();
    s.rig('h1');
    s.cycleHardware('h1'); s.cycleHardware('h1'); // -> rated
    s.cycleHardware('h1');                        // -> wraps to carabiner
    assert(s.pickOf('h1').hw === CARABINER, 'expected wrap back to carabiner');
    assert(s.budget === START_BUDGET - CARABINER.cost, `budget $${s.budget} — wrap should refund the difference`);
    return `wrapped and refunded back to $${s.budget}`;
  });

  test('unrig refunds exactly what the corner cost', () => {
    const s = session();
    s.rig('h1');
    s.cycleHardware('h1'); s.cycleHardware('h1'); // rated, $30
    assert(s.unrig('h1').ok, 'unrig failed');
    assert(s.budget === START_BUDGET, `budget $${s.budget} should be back to $${START_BUDGET}`);
    assert(!s.isRigged('h1'), 'h1 should be free again');
    return 'full refund, no leak';
  });

  test('spares cost real money and refund', () => {
    const s = session();
    assert(s.setSpares(1).ok, 'buying a spare failed');
    assert(s.budget === START_BUDGET - SPARE_COST, `budget $${s.budget}`);
    s.setSpares(0);
    assert(s.budget === START_BUDGET && s.spares === 0, 'selling the spare back should restore budget');
    return `spare costs $${SPARE_COST}, refunds clean`;
  });

  test('budget is a real wall', () => {
    const s = session();
    for (const id of ['h1', 'h2', 'p1', 'p2']) s.rig(id);       // $20, $60 left
    s.cycleHardware('h1'); s.cycleHardware('h1');               // -> rated, $25 more, $35 left
    s.cycleHardware('h2'); s.cycleHardware('h2');               // -> rated, $25 more, $10 left
    s.cycleHardware('p1');                                      // -> shackle, $10, $0 left
    const broke = s.cycleHardware('p2');
    assert(!broke.ok && broke.reason === 'not enough budget', `overspend allowed: ${JSON.stringify(broke)}`);
    assert(s.budget === 0, `budget $${s.budget}`);
    assert(s.pickOf('p2').hw === CARABINER, 'refused upgrade should not have applied');
    return 'refused the upgrade that would have gone negative';
  });

  // DESIGN.md: "good hardware everywhere is unaffordable. You *will* field one
  // dodgy corner — the game is choosing which one." If this ever passes, the
  // central economic tension of the game is gone and the budget is decoration.
  test('you cannot afford good hardware on all four corners', () => {
    const s = session();
    for (const id of ['h1', 'h2', 'p1', 'p2']) s.rig(id);
    let upgraded = 0;
    for (const id of ['h1', 'h2', 'p1', 'p2']) {
      if (s.setHardware(id, RATED).ok) upgraded++;
    }
    assert(upgraded < 4, `all four corners got rated shackles with $${START_BUDGET} — no compromise left to make`);
    assert(upgraded >= 2, `only ${upgraded} rated corners affordable — budget may be too tight to be interesting`);
    return `$${START_BUDGET} buys ${upgraded}/4 rated corners, then you are choosing your weak link`;
  });

  test('picks come back ring-ordered however you click them', () => {
    const s = session();
    // deliberately crossing order: two diagonals first
    for (const id of ['h1', 'p2', 'h2', 'p1']) s.rig(id);
    const ids = s.picks.map((p) => p.anchorId);
    // valid rings are rotations/reflections; assert no anchor sits opposite its
    // true neighbour, i.e. h1 is never adjacent-across from p2
    const i = ids.indexOf('h1');
    const opposite = ids[(i + 2) % 4];
    assert(opposite === 'p2', `h1 should sit opposite p2 in the ring, got ${ids.join(',')}`);
    return `clicked h1,p2,h2,p1 -> ring ${ids.join(' -> ')}`;
  });

  test('tension clamps to the rigging range', () => {
    const s = session();
    assert(s.setTension(99) === TENSION_MAX, 'over-tight should clamp');
    assert(s.setTension(0) === TENSION_MIN, 'over-loose should clamp');
    s.setTension(1.15);
    assert(s.tension === 1.15, 'in-range tension should pass through');
    return `clamped to ${TENSION_MIN}..${TENSION_MAX}`;
  });

  test('commit hands a working rig to the sim', () => {
    const s = session();
    for (const id of ['h1', 'h2', 'p1', 'p2']) s.rig(id);
    s.setHardware('h1', RATED);
    s.setTension(1.1);
    const rig = s.commit(new SailRig({ anchors: ANCHORS }));
    assert(rig.rigged, 'rig should be rigged');
    assert(rig.corners.length === 4, 'rig should have four corners');
    assert(rig.tension === 1.1, `rig tension ${rig.tension}`);
    const h1 = rig.corners.find((c) => c.anchorId === 'h1');
    assert(h1.hw === RATED, 'h1 should have carried its rated shackle into the sim');
    // and it must actually simulate
    const wind = { sample: () => ({ x: 0, y: 0, z: 12 }) };
    for (let i = 0; i < 240; i++) rig.step(1 / 60, wind, i / 60);
    assert(rig.corners.every((c) => Number.isFinite(c.load)), 'committed rig went NaN');
    return `committed and stepped 4 s clean, max load ${(rig.maxLoad() / 1000).toFixed(2)} kN`;
  });

  test('commit refuses an unfinished rig', () => {
    const s = session();
    s.rig('h1'); s.rig('h2');
    let threw = false;
    try { s.commit(new SailRig({ anchors: ANCHORS })); } catch { threw = true; }
    assert(threw, 'committing two corners should throw');
    return 'two corners refused';
  });

  test('summary names the weak link for the HUD', () => {
    const s = session();
    for (const id of ['h1', 'h2', 'p1', 'p2']) s.rig(id);
    s.setHardware('h1', RATED); s.setHardware('h2', SHACKLE); s.setHardware('p1', SHACKLE);
    const sum = s.summary;
    assert(sum.weakest === 'p2', `weakest should be the lone carabiner p2, got ${sum.weakest}`);
    assert(sum.corners.length === 4, 'summary should list four corners');
    return `weak link flagged: ${sum.weakest}, $${sum.budget} left`;
  });

  const pass = results.every((r) => r.pass);
  return { pass, results };
}

function report(out) {
  const lines = out.results.map(
    (r) => `${r.pass ? 'PASS' : 'FAIL'}  ${r.name}${r.detail ? `\n        ${r.detail}` : ''}`
  );
  return `${lines.join('\n')}\n\n${out.pass ? 'ALL GREEN' : 'FAILURES'} — ${out.results.filter((r) => r.pass).length}/${out.results.length}`;
}

if (typeof process !== 'undefined' && process.versions?.node && import.meta.filename === process.argv[1]) {
  const out = runRiggingSelftest();
  console.log(report(out));
  process.exit(out.pass ? 0 : 1);
}

export { report, ANCHORS };