/**
 * Tests for UIScene helper functions and HUD state contract
 */
import { describe, it, expect } from 'vitest';
import { ElementRegistry } from '../src/chemistry/elements';
import { CompoundRegistry } from '../src/chemistry/compounds';
import { QuickSlots, SLOT_COUNT } from '../src/player/quickslots';
import { Inventory } from '../src/player/inventory';
import { Health } from '../src/ecs/components';

/** Mirror of UIScene's getItemDisplayColor for testability */
function getItemDisplayColor(itemId: string): number {
  const el = ElementRegistry.getBySymbol(itemId);
  if (el) return parseInt(el.color.replace('#', ''), 16);
  const comp = CompoundRegistry.getById(itemId);
  if (comp) return parseInt(comp.color.replace('#', ''), 16);
  return 0xffffff;
}

/** Mirror of UIScene's getItemDisplayName for testability */
function getItemDisplayName(itemId: string): string {
  const el = ElementRegistry.getBySymbol(itemId);
  if (el) return el.symbol;
  const comp = CompoundRegistry.getById(itemId);
  if (comp) return comp.formula;
  return itemId;
}

describe('HUD display helpers', () => {
  it('getItemDisplayColor returns correct color for element', () => {
    const color = getItemDisplayColor('Fe');
    expect(color).toBeGreaterThan(0);
    expect(color).not.toBe(0xffffff); // Not the fallback
  });

  it('getItemDisplayColor returns fallback for unknown item', () => {
    expect(getItemDisplayColor('totally_unknown')).toBe(0xffffff);
  });

  it('getItemDisplayName returns symbol for element', () => {
    expect(getItemDisplayName('Fe')).toBe('Fe');
    expect(getItemDisplayName('Na')).toBe('Na');
  });

  it('getItemDisplayName returns formula for compound', () => {
    const name = getItemDisplayName('H2O');
    expect(name).toBe('H₂O');
  });

  it('getItemDisplayName returns raw id for unknown', () => {
    expect(getItemDisplayName('xyz')).toBe('xyz');
  });
});

describe('HUD registry state contract', () => {
  it('QuickSlots.getAll returns array of length SLOT_COUNT', () => {
    const qs = new QuickSlots();
    expect(qs.getAll()).toHaveLength(SLOT_COUNT);
  });

  it('Inventory provides required state fields', () => {
    const inv = new Inventory(500, 20);
    expect(typeof inv.getTotalWeight()).toBe('number');
    expect(typeof inv.maxWeight).toBe('number');
    expect(typeof inv.slotCount).toBe('number');
    expect(Array.isArray(inv.getItems())).toBe(true);
  });

  it('Health component arrays are accessible', () => {
    expect(Array.isArray(Health.current)).toBe(true);
    expect(Array.isArray(Health.max)).toBe(true);
  });
});