import { describe, it, expect, beforeEach } from 'vitest';
import { registerRenderer, getRenderer, clearRegistry } from '../src/renderers/registry';
import type { ModeRenderer, RenderContext } from '../src/renderers/types';

function makeMockRenderer(mode: string): ModeRenderer {
  return {
    mode,
    render(_ctx: RenderContext): void {},
  };
}

describe('renderer registry', () => {
  beforeEach(() => {
    clearRegistry();
  });

  it('registers and retrieves a renderer by mode', () => {
    const renderer = makeMockRenderer('year');
    registerRenderer(renderer);
    expect(getRenderer('year')).toBe(renderer);
  });

  it('throws for unknown mode', () => {
    expect(() => getRenderer('nonexistent')).toThrowError('Unknown heatmap mode');
  });

  it('overwrites renderer for same mode', () => {
    const first = makeMockRenderer('year');
    const second = makeMockRenderer('year');
    registerRenderer(first);
    registerRenderer(second);
    expect(getRenderer('year')).toBe(second);
  });
});