import { afterEach, describe, expect, it } from 'vitest';
import { CreateAssetCommand, CreateTextureCommand } from '../../src/core/commands/assetCommands';
import type { Asset } from '../../src/core/model/Asset';
import type { PropertyBag } from '../../src/core/model/Properties';
import {
  generatedKey,
  generatedPictureOf,
  generatesPictures,
  isGeneratedFile,
  parseGeneratedKey,
  registerPictureSource,
} from '../../src/core/model/generated';
import { findAsset } from '../../src/core/model/Project';
import { resolvePicture } from '../../src/core/model/texture';
import { spriteFromTexture } from '../../src/core/properties/aspect';
import { pictureChoices, textureRefLabel } from '../../src/core/properties/textureRef';
import { makeSpriteScene } from '../helpers';

const FILE = `${'ab'.repeat(32)}.png`;

/**
 * Stands in for the first real generator (#129): an asset type outside the closed list, which is
 * also what a plugin would bring. The drawing itself is beside the point here – what is measured
 * is the path a canvas size and a revision take through the model.
 */
interface DrawnAsset {
  id: string;
  type: string;
  name: string;
  props: PropertyBag;
  canvas: { w: number; h: number };
  revision: number;
}

let unregister: (() => void) | null = null;

function register(): void {
  unregister?.();
  unregister = registerPictureSource('drawing', (asset) => {
    const drawn = asset as unknown as DrawnAsset;
    return { width: drawn.canvas.w, height: drawn.canvas.h, revision: drawn.revision };
  });
}

afterEach(() => {
  unregister?.();
  unregister = null;
});

function sceneWithDrawing(name = 'Logo') {
  const fixture = makeSpriteScene();
  const drawing: DrawnAsset = {
    id: 'draw-1',
    type: 'drawing',
    name,
    props: {},
    canvas: { w: 256, h: 128 },
    revision: 1,
  };
  fixture.project.assets.push(drawing as unknown as Asset);
  register();
  return { ...fixture, drawing };
}

describe('the key a drawn picture is named by', () => {
  it('survives being built and taken apart again', () => {
    expect(generatedKey('a1', 7)).toBe('gen:a1@7');
    expect(parseGeneratedKey('gen:a1@7')).toEqual({ assetId: 'a1', revision: '7' });
    // A fingerprint is a revision as good as a counter – it cannot be forgotten in a command.
    expect(parseGeneratedKey(generatedKey('a1', 'c0ffee'))).toEqual({ assetId: 'a1', revision: 'c0ffee' });
  });

  it('is nothing an uploaded file could be mistaken for', () => {
    expect(isGeneratedFile(FILE)).toBe(false);
    expect(isGeneratedFile('')).toBe(false);
    expect(isGeneratedFile('gen:a1')).toBe(false);
    expect(isGeneratedFile('gen:@7')).toBe(false);
    expect(isGeneratedFile('gen:a1@')).toBe(false);
    expect(isGeneratedFile('a1@7')).toBe(false);
  });
});

describe('an asset that draws its own picture', () => {
  it('is no picture at all while nothing is registered for its type', () => {
    const f = sceneWithDrawing();
    unregister?.();
    unregister = null;
    expect(generatesPictures('drawing')).toBe(false);
    expect(generatedPictureOf(f.drawing as unknown as Asset)).toBeNull();
    expect(resolvePicture(f.project, f.drawing.id)).toBeNull();
    expect(textureRefLabel(f.project, f.drawing.id)).toBe(`${f.drawing.id}?`);
  });

  it('resolves to its canvas, under the key of its revision', () => {
    const f = sceneWithDrawing();
    expect(resolvePicture(f.project, f.drawing.id)).toEqual({
      file: 'gen:draw-1@1',
      smooth: true,
      rect: null,
      sourceWidth: 256,
      sourceHeight: 128,
      slice: null,
    });
  });

  it('reads as a new picture once the drawing has moved on', () => {
    const f = sceneWithDrawing();
    const before = resolvePicture(f.project, f.drawing.id)?.file;
    f.drawing.revision = 2;
    f.drawing.canvas = { w: 64, h: 64 };
    const after = resolvePicture(f.project, f.drawing.id);
    expect(after?.file).not.toBe(before);
    expect(after?.file).toBe('gen:draw-1@2');
    expect([after?.sourceWidth, after?.sourceHeight]).toEqual([64, 64]);
  });

  it('has nothing to show while its canvas has no size', () => {
    const f = sceneWithDrawing();
    f.drawing.canvas = { w: 0, h: 128 };
    expect(resolvePicture(f.project, f.drawing.id)).toBeNull();
  });

  it('takes the filter it is worn with, like an uploaded picture', () => {
    const f = sceneWithDrawing();
    expect(resolvePicture(f.project, f.drawing.id)?.smooth).toBe(true);
    f.drawing.props.filter = 'nearest';
    expect(resolvePicture(f.project, f.drawing.id)?.smooth).toBe(false);
  });

  it('measures a new sprite, as an uploaded picture does', () => {
    const f = sceneWithDrawing();
    expect(spriteFromTexture(f.project, f.drawing.id)).toEqual({
      texture: f.drawing.id,
      width: 256,
      height: 128,
    });
  });

  it('stands among the textures in a texture field, by name and without frames', () => {
    const f = sceneWithDrawing('Alpha');
    const texture = new CreateTextureCommand('Bricks', { file: FILE, width: 64, height: 48 });
    f.stack.execute(texture);
    texture.asset.frames.push({ id: 'f1', name: 'Idle', x: 0, y: 0, w: 32, h: 24 });
    f.stack.execute(new CreateAssetCommand('animation', 'Walk'));

    expect(pictureChoices(f.project).map((c) => [c.id, c.label])).toEqual([
      [f.drawing.id, 'Alpha'],
      [texture.asset.id, 'Bricks'],
      ['f1', 'Bricks / Idle'],
    ]);
    expect(textureRefLabel(f.project, f.drawing.id)).toBe('Alpha');
  });

  it('is worn by a sprite through the same property an uploaded picture is', () => {
    const f = sceneWithDrawing();
    const sprite = findAsset(f.project, f.spriteId)!;
    sprite.props.texture = f.drawing.id;
    expect(resolvePicture(f.project, String(sprite.props.texture))?.file).toBe('gen:draw-1@1');
  });
});