/**
 * The rules behind the Variables tab (#252): which document a target is – the same list asked for
 * twice is one tab, a list inside it another – what the tab says, and how much of a list the
 * inspector draws.
 */
import { beforeEach, describe, expect, it } from 'vitest';
import { CreateAssetCommand, DeleteAssetCommand } from '../../src/core/commands/assetCommands';
import { AddNodeCommand } from '../../src/core/commands/graphCommands';
import { PlaceAssetCommand, RenameSceneObjectCommand } from '../../src/core/commands/sceneObjectCommands';
import { AddVariableCommand } from '../../src/core/commands/variableCommands';
import { createEmptyProject } from '../../src/core/model/Project';
import { resolveList } from '../../src/editor/list/slot';
import { EditorState, type ListSlot, type ValuesTarget } from '../../src/editor/state';
import { deeperSlot, INLINE_LIMIT, shownItems, valuesKey } from '../../src/editor/variables/target';
import { valuesTitle } from '../../src/editor/variables/VariablesEditor';

function setup() {
  const state = new EditorState();
  state.loadProject(createEmptyProject('p', 'P'), 1);
  const create = new CreateAssetCommand('behavior', 'Pickup');
  expect(state.execute(create)).toBe(true);
  const id = create.asset.id;
  expect(state.execute(new AddVariableCommand(id, 'loots', 'list'))).toBe(true);
  return { state, id };
}

describe('the document of a Variables tab', () => {
  const slot: ListSlot = { kind: 'asset', assetId: 'a', key: 'loots' };

  it('is the same for the same list, however the address was built', () => {
    const built = { key: 'loots', assetId: 'a', kind: 'asset', path: [] } as const;
    expect(valuesKey({ kind: 'list', slot })).toBe(valuesKey({ kind: 'list', slot: built }));
    expect(valuesKey({ kind: 'list', slot: deeperSlot(slot, [2]) })).toBe(
      valuesKey({ kind: 'list', slot: { ...slot, path: [2] } }),
    );
  });

  it('is another one for a list inside it, so opening that one adds a tab', () => {
    const outer = valuesKey({ kind: 'list', slot });
    const inner = valuesKey({ kind: 'list', slot: deeperSlot(slot, [2, 'drops']) });
    expect(inner).not.toBe(outer);
    // A key and an index that read alike are still two steps.
    expect(valuesKey({ kind: 'list', slot: deeperSlot(slot, ['2']) })).not.toBe(
      valuesKey({ kind: 'list', slot: deeperSlot(slot, [2]) }),
    );
  });

  it('keeps the variables of an owner apart from a list of it and from another owner', () => {
    const asset: ValuesTarget = { kind: 'variables', owner: { kind: 'asset', assetId: 'a' } };
    const object: ValuesTarget = {
      kind: 'variables',
      owner: { kind: 'object', holderId: 's', objectId: 'a' },
    };
    const keys = new Set([asset, object, { kind: 'list', slot } as const].map(valuesKey));
    expect(keys.size).toBe(3);
  });
});

describe('how much of a list the inspector draws', () => {
  it('draws everything up to the limit and counts the rest', () => {
    expect(shownItems(5, INLINE_LIMIT)).toEqual({ shown: 5, more: 0 });
    expect(shownItems(INLINE_LIMIT, INLINE_LIMIT)).toEqual({ shown: INLINE_LIMIT, more: 0 });
    expect(shownItems(23, INLINE_LIMIT)).toEqual({ shown: INLINE_LIMIT, more: 3 });
  });

  it('draws all of it without a limit – the tab', () => {
    expect(shownItems(500)).toEqual({ shown: 500, more: 0 });
  });
});

describe('what a Variables tab says', () => {
  let f: ReturnType<typeof setup>;
  beforeEach(() => (f = setup()));

  it('names the asset, the placed object and the list', () => {
    expect(valuesTitle(f.state, { kind: 'variables', owner: { kind: 'asset', assetId: f.id } })).toBe(
      'Pickup · Variables',
    );
    const createScene = new CreateAssetCommand('scene', 'Level');
    expect(f.state.execute(createScene)).toBe(true);
    const scene = createScene.asset.id;
    const place = new PlaceAssetCommand(scene, f.id, { x: 0, y: 0 });
    expect(f.state.execute(place)).toBe(true);
    const object: ValuesTarget = {
      kind: 'variables',
      owner: { kind: 'object', holderId: scene, objectId: place.objectId },
    };
    expect(valuesTitle(f.state, object)).toBe('Pickup · Variables');
    expect(f.state.execute(new RenameSceneObjectCommand(scene, place.objectId, 'Coin 3'))).toBe(true);
    expect(valuesTitle(f.state, object)).toBe('Coin 3 · Variables');
    const slot: ListSlot = { kind: 'asset', assetId: f.id, key: 'loots' };
    expect(valuesTitle(f.state, { kind: 'list', slot })).toBe('Pickup · loots');
  });

  it('says nothing once the owner is gone – the tab closes then', () => {
    const target: ValuesTarget = { kind: 'variables', owner: { kind: 'asset', assetId: f.id } };
    const list: ValuesTarget = { kind: 'list', slot: { kind: 'asset', assetId: f.id, key: 'loots' } };
    expect(f.state.execute(new DeleteAssetCommand(f.id))).toBe(true);
    expect(valuesTitle(f.state, target)).toBe(null);
    expect(valuesTitle(f.state, list)).toBe(null);
  });

  it('has no Variables tab for an asset that declares none', () => {
    const texture = new CreateAssetCommand('texture', 'T');
    expect(f.state.execute(texture)).toBe(true);
    const target: ValuesTarget = { kind: 'variables', owner: { kind: 'asset', assetId: texture.asset.id } };
    expect(valuesTitle(f.state, target)).toBe(null);
  });
});

describe('opening a list in a tab', () => {
  let f: ReturnType<typeof setup>;
  beforeEach(() => (f = setup()));

  it('asks for a tab on the list itself, or on one inside it', () => {
    const list = resolveList(f.state, { kind: 'asset', assetId: f.id, key: 'loots' })!;
    list.replace([[1, 2]]);
    let asked = 0;
    f.state.on('values', () => (asked += 1));
    list.openList!([]);
    expect(f.state.openedValues).toEqual({
      kind: 'list',
      slot: { kind: 'asset', assetId: f.id, key: 'loots', path: [] },
    });
    list.openList!([0]);
    expect(f.state.openedValues).toEqual({
      kind: 'list',
      slot: { kind: 'asset', assetId: f.id, key: 'loots', path: [0] },
    });
    expect(asked).toBe(2);
  });

  it('offers no tab for a list a node holds inline', () => {
    const add = new AddNodeCommand(f.id, 'List', 0, 0);
    expect(f.state.execute(add)).toBe(true);
    const node = resolveList(f.state, { kind: 'node', assetId: f.id, nodeId: add.node.id, key: 'value' })!;
    expect(node.openList).toBeUndefined();
    node.replace([[1]]);
    expect(node.sub([0])!.openList).toBeUndefined();
  });
});