/**
 * Editing a value three levels deep (#239): an inline list reaches a nested list by a path of keys
 * and indices, an inspector row a nested struct field by its keys. Either way one edit is one
 * command on the whole value, so undo takes back exactly that edit and the neighbours stay.
 */
import { beforeEach, describe, expect, it } from 'vitest';
import { CreateAssetCommand, SetAssetPropertyCommand } from '../../src/core/commands/assetCommands';
import { AddStructFieldCommand, AddVariableCommand } from '../../src/core/commands/variableCommands';
import type { BehaviorAsset } from '../../src/core/model/Asset';
import type { PropertyValue } from '../../src/core/model/Properties';
import { createEmptyProject, findAsset } from '../../src/core/model/Project';
import { requirePropDef } from '../../src/core/commands/require';
import { structFieldsOf } from '../../src/editor/inspector/previewHandlers';
import { resolveList } from '../../src/editor/list/slot';
import { EditorState, type ListSlot } from '../../src/editor/state';

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

const props = (f: ReturnType<typeof setup>) => (findAsset(f.state.project, f.id) as BehaviorAsset).props;

describe('a list nested in the items of a list', () => {
  let f: ReturnType<typeof setup>;
  const rows = [{ name: 'a', drops: [1, { x: [2, 3] }] }, 'plain'];
  beforeEach(() => {
    f = setup();
    expect(f.state.execute(new AddVariableCommand(f.id, 'rows', 'list'))).toBe(true);
    resolveList(f.state, { kind: 'asset', assetId: f.id, key: 'rows' })!.replace(rows);
  });

  const at = (path: ListSlot['path']) =>
    resolveList(f.state, { kind: 'asset', assetId: f.id, key: 'rows', path });

  it('is found by its path, and the title spells the path out', () => {
    expect(at([0, 'drops'])!.value).toEqual([1, { x: [2, 3] }]);
    expect(at([0, 'drops'])!.title).toBe('B · rows · [0] · drops');
    expect(at([0, 'drops', 1, 'x'])!.value).toEqual([2, 3]);
    expect(at([0, 'drops', 1, 'x'])!.title).toBe('B · rows · [0] · drops · [1] · x');
  });

  it('is nothing where the path leads to no list', () => {
    expect(at([0, 'name'])).toBe(null);
    expect(at([1, 'drops'])).toBe(null);
    expect(at([5])).toBe(null);
  });

  it('writes one deep item as one command on the whole list, and undo takes back just that', () => {
    at([0, 'drops', 1, 'x'])!.itemHandlers(1).onChange(9);
    expect(props(f).rows).toEqual([{ name: 'a', drops: [1, { x: [2, 9] }] }, 'plain']);
    at([0, 'drops'])!.replace([1, { x: [2, 9] }, [4]]);
    expect(props(f).rows).toEqual([{ name: 'a', drops: [1, { x: [2, 9] }, [4]] }, 'plain']);

    f.state.commands.undo();
    expect(props(f).rows).toEqual([{ name: 'a', drops: [1, { x: [2, 9] }] }, 'plain']);
    f.state.commands.undo();
    expect(props(f).rows).toEqual(rows);
  });

  it('edits a value inside an item by its path, keeping the kind it has', () => {
    const list = at([])!;
    list.handlersAt([0, 'drops', 1, 'x', 0]).onChange('7');
    expect(props(f).rows).toEqual([{ name: 'a', drops: [1, { x: [7, 3] }] }, 'plain']);
  });

  it('previews a deep edit and still undoes to before the preview', () => {
    const handlers = at([])!.handlersAt([0, 'name']);
    handlers.onInput('ab');
    handlers.onInput('abc');
    handlers.onChange('abc');
    expect(props(f).rows).toEqual([{ name: 'abc', drops: [1, { x: [2, 3] }] }, 'plain']);
    f.state.commands.undo();
    expect(props(f).rows).toEqual(rows);
  });

  it('opens a tab one level further down', () => {
    at([0, 'drops'])!.openList!([1, 'x']);
    expect(f.state.openedValues).toEqual({
      kind: 'list',
      slot: { kind: 'asset', assetId: f.id, key: 'rows', path: [0, 'drops', 1, 'x'] },
    });
  });

  it('reaches a list inside it for drawing it inline, writing the whole value', () => {
    const inner = at([0, 'drops'])!.sub([1, 'x'])!;
    expect(inner.title).toBe(at([0, 'drops', 1, 'x'])!.title);
    expect(inner.value).toEqual([2, 3]);
    inner.replace([2, 3, 4]);
    expect(props(f).rows).toEqual([{ name: 'a', drops: [1, { x: [2, 3, 4] }] }, 'plain']);
    expect(at([0, 'drops'])!.sub([0])).toBe(null);
  });
});

describe('a field of a struct declared inside a struct', () => {
  let f: ReturnType<typeof setup>;
  beforeEach(() => {
    f = setup();
    const run = (command: Parameters<EditorState['execute']>[0]) =>
      expect(f.state.execute(command)).toBe(true);
    run(new AddVariableCommand(f.id, 'enemy', 'struct'));
    run(new AddStructFieldCommand(f.id, 'enemy', { key: 'hp', kind: 'number' }));
    run(new AddStructFieldCommand(f.id, 'enemy', { key: 'loot', kind: 'struct', fields: [] }));
    run(new AddStructFieldCommand(f.id, 'enemy', { key: 'count', kind: 'number' }, ['loot']));
    run(new AddStructFieldCommand(f.id, 'enemy', { key: 'drops', kind: 'list' }, ['loot']));
    run(new SetAssetPropertyCommand(f.id, 'enemy', { hp: 5, loot: { count: 1, drops: ['a'] } }));
  });

  const handlers = () => {
    const def = requirePropDef(f.state.project, findAsset(f.state.project, f.id)!, 'enemy');
    if (def.kind !== 'struct') throw new Error('enemy is not a struct');
    return structFieldsOf<{ props: Record<string, PropertyValue> }>(
      { state: f.state },
      def,
      {
        target: () => findAsset(f.state.project, f.id),
        read: (a) => a.props.enemy,
        write: (a, value) => (a.props.enemy = value),
        commit: (value) => new SetAssetPropertyCommand(f.id, 'enemy', value),
      },
      (path) => ({ kind: 'asset', assetId: f.id, key: 'enemy', path }),
    );
  };

  it('writes the nested field and leaves every other one alone, one undo step', () => {
    handlers()(['loot', 'count'], { key: 'count', kind: 'number' }).onChange(4);
    expect(props(f).enemy).toEqual({ hp: 5, loot: { count: 4, drops: ['a'] } });
    f.state.commands.undo();
    expect(props(f).enemy).toEqual({ hp: 5, loot: { count: 1, drops: ['a'] } });
  });

  it('draws a list field inline by its path', () => {
    const list = handlers()(['loot', 'drops'], { key: 'drops', kind: 'list' }).list!()!;
    expect(list.title).toBe('B · enemy · loot · drops');
    list.replace(['a', ['b']]);
    expect(props(f).enemy).toEqual({ hp: 5, loot: { count: 1, drops: ['a', ['b']] } });
  });
});