import { describe, expect, it } from 'vitest';

import {
  buildCombatFeedbackEvents,
  type CombatFeedbackHealthSample,
} from './combatFeedback';

function toSample(key: string, hp: number): CombatFeedbackHealthSample {
  return {
    key,
    kind: key.startsWith('hostile') ? 'hostile' : 'player',
    hp,
  };
}

describe('combatFeedback', () => {
  it('creates red damage and green healing deltas from committed hp changes', () => {
    const previous = new Map([
      ['player', toSample('player', 20)],
      ['hostile:npc-liu', toSample('hostile:npc-liu', 8)],
    ]);

    const result = buildCombatFeedbackEvents(
      previous,
      [
        toSample('player', 11),
        toSample('hostile:npc-liu', 9),
      ],
      4,
    );

    expect(result.events).toEqual([
      {
        id: 'player:5',
        targetKey: 'player',
        kind: 'player',
        delta: -9,
      },
      {
        id: 'hostile:npc-liu:6',
        targetKey: 'hostile:npc-liu',
        kind: 'hostile',
        delta: 1,
      },
    ]);
    expect(result.nextSequence).toBe(6);
  });

  it('ignores first render samples and unchanged hp', () => {
    const result = buildCombatFeedbackEvents(
      new Map([['player', toSample('player', 20)]]),
      [
        toSample('player', 20),
        toSample('companion:npc-chen', 6),
      ],
      0,
    );

    expect(result.events).toEqual([]);
    expect(result.nextSequence).toBe(0);
  });
});