/**
 * How closely the editor follows a running game (#265): the preset in the project, the rule that
 * decides frame by frame what the panels get, and the group a spawned object is listed in.
 */
import { describe, expect, it } from 'vitest';
import { SetWhilePlayingCommand } from '../../src/core/commands/projectCommands';
import { groupMemberIds } from '../../src/core/model/hierarchy';
import { whilePlayingOf } from '../../src/core/model/playSettings';
import { createEmptyProject, findAsset, findScene } from '../../src/core/model/Project';
import { deserializeProject, serializeProject } from '../../src/core/store/serialize';
import { PANEL_RATE, PanelClock, panelPolicy, type PanelUpdate } from '../../src/editor/playThrottle';
import { EditorState } from '../../src/editor/state';
import { TRACE_FADE } from '../../src/runtime/systems/BehaviorSystem';
import { makeSpriteScene, place, startWorld } from '../helpers';

const FRAME = 1000 / 60;

/** Runs `frames` frames at 60 fps and counts what the panels got; `spawnEvery` frames objects change. */
function run(clock: PanelClock, mode: 'live' | 'balanced' | 'minimal', frames: number, spawnEvery = 0) {
  const policy = panelPolicy(mode);
  const counts = { structure: 0, values: 0, graphs: 0 };
  const updates: PanelUpdate[] = [];
  for (let i = 0; i < frames; i++) {
    const update = clock.frame(policy, 1000 + i * FRAME, spawnEvery > 0 && i % spawnEvery === 0);
    updates.push(update);
    for (const key of ['structure', 'values', 'graphs'] as const) if (update[key]) counts[key]++;
  }
  return { counts, updates };
}

describe('While playing preset', () => {
  it('is Balanced in a new project and in one written before there was a choice', () => {
    expect(createEmptyProject('p', 'P').whilePlaying).toBe('balanced');
    expect(deserializeProject({ id: 'p', name: 'P', assets: [] }).whilePlaying).toBe('balanced');
  });

  it('survives a save and a load, and reads anything else as the default', () => {
    const project = { ...createEmptyProject('p', 'P'), whilePlaying: 'live' as const };
    expect(deserializeProject(serializeProject(project)).whilePlaying).toBe('live');
    expect(whilePlayingOf({ whilePlaying: 'minimal' })).toBe('minimal');
    expect(whilePlayingOf({ whilePlaying: 'fast' })).toBe('balanced');
    expect(whilePlayingOf(null)).toBe('balanced');
  });

  it('is one undo step', () => {
    const state = new EditorState();
    state.loadProject(createEmptyProject('p', 'P'), 1);
    state.execute(new SetWhilePlayingCommand('minimal'));
    expect(state.project.whilePlaying).toBe('minimal');
    expect(state.saveStatus).toBe('dirty');
    state.undo();
    expect(state.project.whilePlaying).toBe('balanced');
  });
});

describe('panel clock', () => {
  it('Live brings every panel up to date in every frame, a spawn included', () => {
    const { counts, updates } = run(new PanelClock(), 'live', 60, 1);
    expect(counts).toEqual({ structure: 60, values: 60, graphs: 60 });
    expect(updates.every((u) => u.structure)).toBe(true);
  });

  it(`Balanced catches up ${PANEL_RATE} times a second, however often objects change`, () => {
    const { counts } = run(new PanelClock(), 'balanced', 120, 1);
    // The graphs keep up with every frame: they draw only while their tab is on screen.
    expect(counts).toEqual({ structure: 8, values: 8, graphs: 120 });
  });

  it('Balanced keeps a change of structure that falls between two updates for the next one', () => {
    const clock = new PanelClock();
    const policy = panelPolicy('balanced');
    expect(clock.frame(policy, 0, false).structure).toBe(false);
    expect(clock.frame(policy, 100, true)).toEqual({ structure: false, values: false, graphs: true });
    expect(clock.holdsStructure).toBe(true);
    expect(clock.frame(policy, 200, false).structure).toBe(false);
    expect(clock.frame(policy, 250, false)).toEqual({ structure: true, values: true, graphs: true });
    expect(clock.frame(policy, 500, false).structure).toBe(false);
  });

  it('Minimal holds hierarchy and values until the game stands still, the graphs stay throttled', () => {
    const clock = new PanelClock();
    const { counts } = run(clock, 'minimal', 120, 30);
    expect(counts).toEqual({ structure: 0, values: 0, graphs: 8 });
    expect(clock.flush()).toEqual({ structure: true, values: true, graphs: true });
    expect(clock.flush().structure).toBe(false);
  });

  it('a pause brings everything held back at once', () => {
    const clock = new PanelClock();
    clock.frame(panelPolicy('balanced'), 0, false);
    clock.frame(panelPolicy('balanced'), 10, true);
    expect(clock.flush()).toEqual({ structure: true, values: true, graphs: true });
  });

  it('shows every pulse at least once: the gap between two updates is shorter than a pulse glows', () => {
    expect(1000 / PANEL_RATE).toBeLessThan(TRACE_FADE * 1000);
  });

  it('keeps the scene view drawing behind the game tab only on Live', () => {
    expect(panelPolicy('live').hiddenSceneView).toBe(true);
    expect(panelPolicy('balanced').hiddenSceneView).toBe(false);
    expect(panelPolicy('minimal').hiddenSceneView).toBe(false);
  });
});

describe('spawned objects in a group (#265)', () => {
  it('lists an object spawned at the top level in a group named after its asset, made once', () => {
    const f = makeSpriteScene();
    const { world } = startWorld(f);
    const scene = () => findScene(f.project, f.sceneId)!;
    const name = findAsset(f.project, f.spriteId)!.name;
    const first = world.spawn(f.spriteId, { x: 0, y: 0, z: 0 }, null)!;
    const second = world.spawn(f.spriteId, { x: 5, y: 0, z: 0 }, null)!;
    expect(scene().groups).toHaveLength(1);
    const group = scene().groups![0]!;
    expect(group.name).toBe(name);
    expect(groupMemberIds(scene(), group.id)).toEqual([first.objectId, second.objectId]);
    // The object keeps its asset's name: the group changes the list, not what a Find looks for.
    expect(first.name).toBe(name);
  });

  it('joins a group of that name that is already there, and leaves a spawned child under its parent', () => {
    const f = makeSpriteScene();
    const parent = place(f, f.spriteId, { x: 0, y: 0 });
    const name = findAsset(f.project, f.spriteId)!.name;
    const scene = findScene(f.project, f.sceneId)!;
    scene.groups = [{ id: 'mine', name }];
    const { world } = startWorld(f);
    const top = world.spawn(f.spriteId, { x: 0, y: 0, z: 0 }, null)!;
    const child = world.spawn(f.spriteId, { x: 0, y: 0, z: 0 }, world.findByObjectId(parent)!)!;
    const objectOf = (id: string) => findScene(f.project, f.sceneId)!.objects.find((o) => o.id === id)!;
    expect(findScene(f.project, f.sceneId)!.groups).toEqual([{ id: 'mine', name }]);
    expect(objectOf(top.objectId).groupId).toBe('mine');
    expect(objectOf(child.objectId).groupId).toBeUndefined();
  });
});