/**
 * One builder draws a variable on its asset (renamable) and on a placed object (names are labels).
 * `NumberField extends TextField`, so the tests go by the name's widget rather than counting by type.
 */
import { describe, expect, it } from 'vitest';
import { createEmptyProject } from '../../src/core/model/Project';
import type { PropertyDef, StructDef } from '../../src/core/properties/PropertySchema';
import { HStack, Label, TextField, Theme, VStack, type Widget } from '../../src/ui';
import { type FieldHandlers, labelledRow } from '../../src/editor/inspector/fieldFactory';
import type { InspectorHost } from '../../src/editor/inspector/host';
import { buildVariable, type VariableEditing } from '../../src/editor/inspector/variableRows';
import { EditorState } from '../../src/editor/state';

const STRUCT: StructDef = {
  key: 'piece',
  label: 'piece',
  kind: 'struct',
  default: { x: 0, tag: '' },
  fields: [
    { key: 'x', kind: 'number' },
    { key: 'tag', kind: 'text' },
  ],
};

const VALUE = { x: 30, tag: 'tee' };

const PLAIN: PropertyDef[] = [
  { key: 'speed', label: 'speed', kind: 'number', default: 0 },
  { key: 'title', label: 'title', kind: 'text', default: '' },
  { key: 'alive', label: 'alive', kind: 'boolean', default: true },
  { key: 'cells', label: 'cells', kind: 'list', default: [] },
  { key: 'a_rather_long_variable_name', label: 'a_rather_long_variable_name', kind: 'number', default: 0 },
];

function makeHost(): InspectorHost {
  const state = new EditorState();
  state.loadProject(createEmptyProject('p', 'P'), 1);
  return { state, body: new VStack(), fields: new Map(), nameField: null, project: () => state.project };
}

const noHandlers = (): FieldHandlers => ({ onInput: () => {}, onChange: () => {} });
const withFields: FieldHandlers = { ...noHandlers(), structFieldHandlers: noHandlers };

const EDIT: VariableEditing = {
  rename: () => {},
  remove: () => {},
  setScope: () => {},
  renameField: () => {},
  removeField: () => {},
  addField: () => {},
};

const rows = (host: InspectorHost): Widget[][] =>
  host.body.children.map((row) => ('children' in row ? (row.children as Widget[]) : []));

/** Every widget of the body that carries `text` as its own content, name or value. */
const carrying = (host: InspectorHost, text: string): Widget[] =>
  rows(host)
    .flat()
    .filter((w) => (w instanceof Label && w.text === text) || (w instanceof TextField && w.value === text));

const isName = (w: Widget, name: string) =>
  (w instanceof Label && w.text === name) || (w instanceof TextField && w.value === name);

/** Where the widget after the name starts – summed from the measured cells before it. */
function valueX(host: InspectorHost, name: string): number {
  for (const row of host.body.children) {
    if (!(row instanceof HStack)) continue;
    const items = row.items;
    const at = items.findIndex((w) => isName(w, name));
    if (at < 0) continue;
    return items.slice(0, at + 1).reduce((x, w) => x + w.measure().w + row.gap, row.padding);
  }
  throw new Error(`no row named ${name}`);
}

function buildAll(edit?: VariableEditing): InspectorHost {
  const host = makeHost();
  for (const def of PLAIN) buildVariable(host, def, def.default, noHandlers(), { edit });
  buildVariable(host, STRUCT, VALUE, withFields, { edit });
  return host;
}

const NAMES = [...PLAIN.map((d) => d.key), 'x', 'tag'];

describe('the column grid', () => {
  it('starts every value at the same x on a placed object, whatever the kind or depth', () => {
    const host = buildAll();
    const xs = NAMES.map((name) => valueX(host, name));
    expect(new Set(xs), JSON.stringify(xs)).toEqual(new Set([xs[0]]));
  });

  it('and at that same x on the asset, where the names are editable fields', () => {
    const placed = valueX(buildAll(), 'speed');
    const host = buildAll(EDIT);
    const xs = NAMES.map((name) => valueX(host, name));
    expect(xs, JSON.stringify(xs)).toEqual(NAMES.map(() => placed));
  });

  it('which is where a plain labelled row starts its value too', () => {
    const { label } = labelledRow('Enabled');
    expect(label.minWidth + Theme.gap).toBe(valueX(buildAll(), 'speed'));
  });
});

describe('a struct on a placed object', () => {
  it('is a head row plus one row per field', () => {
    const host = makeHost();
    buildVariable(host, STRUCT, VALUE, withFields);
    expect(host.body.children.length).toBe(1 + STRUCT.fields.length);
  });

  it('names the bundle and its fields with labels, so they cannot be edited', () => {
    const host = makeHost();
    buildVariable(host, STRUCT, VALUE, withFields);
    for (const name of ['piece', 'x', 'tag']) {
      const [widget] = carrying(host, name);
      expect(widget, name).toBeInstanceOf(Label);
    }
  });

  it('still shows the values in editable fields', () => {
    const host = makeHost();
    buildVariable(host, STRUCT, VALUE, withFields);
    expect(carrying(host, 'tee')[0]).toBeInstanceOf(TextField);
  });
});

describe('the same struct on the asset that declares it', () => {
  it('names the bundle and its fields with text fields, so they can be renamed', () => {
    const host = makeHost();
    buildVariable(host, STRUCT, VALUE, withFields, { edit: EDIT });
    for (const name of ['piece', 'x', 'tag']) {
      const [widget] = carrying(host, name);
      expect(widget, name).toBeInstanceOf(TextField);
    }
  });

  it('keeps the same row count as the placed one', () => {
    const host = makeHost();
    buildVariable(host, STRUCT, VALUE, withFields, { edit: EDIT });
    expect(host.body.children.length).toBe(1 + STRUCT.fields.length);
  });
});