airship-phaser/tests/game-logic.test.mjs

import test from 'node:test';
import assert from 'node:assert/strict';

import {
  DEFAULT_PIRATE_SHOT_DAMAGE,
  PLAYER_HIT_COOLDOWN_MS,
  PLAYER_MAX_HULL,
  normalizePlayerDamage,
  processQueuedPlayerHits,
  reducePlayerHitQueue,
  reducePlayerProjectileHits,
  reducePlayerVolleyHits,
} from '../src/game-logic.js';

test('first pirate hit removes exactly the default damage and does not end the game', () => {
  const result = reducePlayerHitQueue({
    hull: PLAYER_MAX_HULL,
    lastHitAt: -Infinity,
    now: 1000,
    damages: [DEFAULT_PIRATE_SHOT_DAMAGE],
  });

  assert.equal(result.hull, 94);
  assert.equal(result.appliedHits, 1);
  assert.equal(result.ignoredHits, 0);
  assert.equal(result.totalDamage, 6);
  assert.equal(result.gameOver, false);
});


test('actual queued first player hit applies 6 damage without mutating projectile lifecycle', () => {
  const shot = {
    active: true,
    destroyed: false,
    destroy() {
      this.destroyed = true;
      this.active = false;
    },
  };

  const firstFrame = processQueuedPlayerHits({
    hull: PLAYER_MAX_HULL,
    lastHitAt: -Infinity,
    now: 1000,
    hits: [{ shot, damage: DEFAULT_PIRATE_SHOT_DAMAGE }],
  });

  assert.equal(shot.destroyed, false);
  assert.equal(shot.active, true);
  assert.equal(firstFrame.hull, 94);
  assert.equal(firstFrame.appliedHits, 1);
  assert.equal(firstFrame.ignoredHits, 0);
  assert.equal(firstFrame.gameOver, false);

  const followingFrame = processQueuedPlayerHits({
    hull: firstFrame.hull,
    lastHitAt: firstFrame.lastHitAt,
    now: 1016,
    hits: [],
  });

  assert.equal(followingFrame.hull, 94);
  assert.equal(followingFrame.gameOver, false);
  assert.equal(followingFrame.appliedHits, 0);
});

test('three cannonballs arriving in one broadside only apply one hull hit', () => {
  const result = reducePlayerHitQueue({
    hull: 100,
    lastHitAt: -Infinity,
    now: 2000,
    damages: [6, 6, 6],
  });

  assert.equal(result.hull, 94);
  assert.equal(result.appliedHits, 1);
  assert.equal(result.ignoredHits, 2);
});

test('hit inside cooldown is ignored and exact cooldown boundary is accepted', () => {
  const blocked = reducePlayerHitQueue({
    hull: 94,
    lastHitAt: 1000,
    now: 1000 + PLAYER_HIT_COOLDOWN_MS - 1,
    damages: [6],
  });

  assert.equal(blocked.hull, 94);
  assert.equal(blocked.appliedHits, 0);
  assert.equal(blocked.ignoredHits, 1);

  const accepted = reducePlayerHitQueue({
    hull: 94,
    lastHitAt: 1000,
    now: 1000 + PLAYER_HIT_COOLDOWN_MS,
    damages: [6],
  });

  assert.equal(accepted.hull, 88);
  assert.equal(accepted.appliedHits, 1);
});

test('damage normalization handles invalid and extreme values safely', () => {
  assert.equal(normalizePlayerDamage(undefined), 6);
  assert.equal(normalizePlayerDamage('not-a-number'), 6);
  assert.equal(normalizePlayerDamage(999), 25);
  assert.equal(normalizePlayerDamage(-12), 1);
  assert.equal(normalizePlayerDamage('8'), 8);
});

test('invalid hull state recovers from max hull before applying damage', () => {
  const result = reducePlayerHitQueue({
    hull: Number.NaN,
    lastHitAt: -Infinity,
    now: 3000,
    damages: [6],
  });

  assert.equal(result.hull, 94);
  assert.equal(result.gameOver, false);
});

test('lethal hit clamps hull at zero and reports game over', () => {
  const result = reducePlayerHitQueue({
    hull: 5,
    lastHitAt: -Infinity,
    now: 4000,
    damages: [6],
  });

  assert.equal(result.hull, 0);
  assert.equal(result.totalDamage, 6);
  assert.equal(result.gameOver, true);
});

test('empty hit queue is a no-op', () => {
  const result = reducePlayerHitQueue({
    hull: 72,
    lastHitAt: 1234,
    now: 5000,
    damages: [],
  });

  assert.equal(result.hull, 72);
  assert.equal(result.lastHitAt, 1234);
  assert.equal(result.appliedHits, 0);
  assert.equal(result.ignoredHits, 0);
  assert.equal(result.gameOver, false);
});

test('one pirate broadside damages once, and the next broadside damages again', () => {
  const firstVolley = reducePlayerVolleyHits({
    hull: 100,
    hits: [
      { volleyId: 101, damage: 6 },
      { volleyId: 101, damage: 6 },
      { volleyId: 101, damage: 6 },
    ],
  });

  assert.equal(firstVolley.hull, 94);
  assert.equal(firstVolley.totalDamage, 6);
  assert.equal(firstVolley.acceptedHits.length, 1);
  assert.equal(firstVolley.ignoredHits.length, 2);

  const secondVolley = reducePlayerVolleyHits({
    hull: firstVolley.hull,
    seenVolleyIds: firstVolley.seenVolleyIds,
    hits: [
      { volleyId: 102, damage: 6 },
      { volleyId: 102, damage: 6 },
    ],
  });

  assert.equal(secondVolley.hull, 88);
  assert.equal(secondVolley.totalDamage, 6);
  assert.equal(secondVolley.acceptedHits.length, 1);
  assert.equal(secondVolley.ignoredHits.length, 1);

  const repeatedSecondVolley = reducePlayerVolleyHits({
    hull: secondVolley.hull,
    seenVolleyIds: secondVolley.seenVolleyIds,
    hits: [{ volleyId: 102, damage: 6 }],
  });

  assert.equal(repeatedSecondVolley.hull, 88);
  assert.equal(repeatedSecondVolley.totalDamage, 0);
  assert.equal(repeatedSecondVolley.acceptedHits.length, 0);
  assert.equal(repeatedSecondVolley.ignoredHits.length, 1);
});

test('different pirate volleys can both damage even when processed together', () => {
  const result = reducePlayerVolleyHits({
    hull: 100,
    hits: [
      { volleyId: 201, damage: 6 },
      { volleyId: 202, damage: 6 },
    ],
  });

  assert.equal(result.hull, 88);
  assert.equal(result.totalDamage, 12);
  assert.equal(result.acceptedHits.length, 2);
  assert.equal(result.ignoredHits.length, 0);
});

test('every new pirate projectile can damage once with no cross-shot suppression', () => {
  const first = reducePlayerProjectileHits({
    hull: 100,
    hits: [{ damage: 6 }],
  });

  assert.equal(first.hull, 94);
  assert.equal(first.totalDamage, 6);
  assert.equal(first.appliedHits, 1);
  assert.equal(first.gameOver, false);

  const second = reducePlayerProjectileHits({
    hull: first.hull,
    hits: [{ damage: 6 }],
  });

  assert.equal(second.hull, 88);
  assert.equal(second.totalDamage, 6);
  assert.equal(second.appliedHits, 1);
  assert.equal(second.gameOver, false);
});

test('multiple distinct pirate projectiles in the same frame all apply damage', () => {
  const result = reducePlayerProjectileHits({
    hull: 100,
    hits: [
      { damage: 6 },
      { damage: 6 },
      { damage: 6 },
    ],
  });

  assert.equal(result.hull, 82);
  assert.equal(result.totalDamage, 18);
  assert.equal(result.appliedHits, 3);
});