import { describe, expect, it } from 'vitest';
import { PlaceAssetCommand } from '../../src/core/commands/sceneObjectCommands';
import { drawSlots } from '../../src/viewport/drawOrder';
import { collectWorldItems } from '../../src/viewport/items';
import { graphEditor, makeBehavior, makeSpriteScene, place, startWorld } from '../helpers';

/**
 * Two sprites on the same spot, "front" at z 1 and "back" at z 0. On `f` a behavior on "back" sets
 * its z to 2 with `Set Z` and logs `Get Z` of it: z, then world z.
 */
function start() {
  const f = makeSpriteScene();
  const back = place(f, f.spriteId, { x: 0, y: 0, z: 0 });
  const front = place(f, f.spriteId, { x: 0, y: 0, z: 1 });
  const behavior = makeBehavior(f, 'Raise');
  f.stack.execute(new PlaceAssetCommand(f.sceneId, behavior.id, { x: 0, y: 0 }, back));
  const edit = graphEditor(f, behavior);
  const owner = edit.addNode('Owner');
  const set = edit.addNode('SetZ', { z: 2 });
  edit.connect(edit.addNode('OnKeyDown', { key: 'f' }), 'exec', set, 'exec');
  edit.connect(owner, 'object', set, 'object');
  const get = edit.addNode('GetZ');
  edit.connect(owner, 'object', get, 'object');
  let from = set;
  for (const output of ['z', 'worldZ']) {
    const log = edit.addNode('Log');
    edit.connect(get, output, log, 'message');
    edit.connect(from, 'exec', log, 'exec');
    from = log;
  }

  const started = startWorld(f, { behaviors: true });
  const name = (id: string) => (id === back ? 'back' : id === front ? 'front' : id);
  const order = () =>
    drawSlots(collectWorldItems(started.world).items.filter((item) => item.type === 'sprite')).map((slot) =>
      name(slot.id),
    );
  started.frame();
  return { ...started, order };
}

describe('a graph changes the z of an object during the run', () => {
  it('draws the object in front once Set Z has raised it, and Get Z reads the new z', () => {
    const r = start();
    expect(r.order()).toEqual(['back', 'front']);
    r.input.press('f');
    r.frame();
    expect(r.order()).toEqual(['front', 'back']);
    expect(r.world.log).toEqual(['2', '2']);
  });
});