/**
 * Seeding the fields of a Pack/Expand from a variable that already declares the shape. The node
 * keeps declaring its own ports – this only copies a shape that exists elsewhere in the behavior.
 */
import { describe, expect, it } from 'vitest';
import { AddPortCommand, AddPortsCommand } from '../../src/core/commands/portCommands';
import {
  AddStructFieldCommand,
  AddVariableCommand,
  SetListItemsCommand,
} from '../../src/core/commands/variableCommands';
import {
  type DeclaredPortKind,
  fieldPortKind,
  missingFieldPorts,
  resolveDef,
  structShapeOf,
} from '../../src/core/graph';
import type { BehaviorAsset } from '../../src/core/model/Asset';
import { behaviorLookup } from '../../src/core/model/behaviorPrograms';
import type { StructFieldDef } from '../../src/core/properties/PropertySchema';
import { graphEditor, makeBehavior, makeProject } from '../helpers';

const PIECE: readonly StructFieldDef[] = [
  { key: 'shape', kind: 'number' },
  { key: 'name', kind: 'text' },
  { key: 'held', kind: 'boolean' },
  { key: 'tint', kind: 'color' },
  { key: 'cells', kind: 'list', items: 'number' },
];

function behaviorWithPiece() {
  const fixture = makeProject();
  const behavior = makeBehavior(fixture, 'B');
  fixture.stack.execute(new AddVariableCommand(behavior.id, 'piece', 'struct'));
  for (const field of PIECE) fixture.stack.execute(new AddStructFieldCommand(behavior.id, 'piece', field));
  return { ...fixture, behavior, edit: graphEditor(fixture, behavior) };
}

const varOf = (behavior: BehaviorAsset, key: string) => behavior.variables.find((v) => v.key === key)!;

describe('the shape a variable declares', () => {
  it('is the fields of a struct variable and the item fields of a list of structs', () => {
    const fixture = behaviorWithPiece();
    const { behavior, stack } = fixture;
    stack.execute(new AddVariableCommand(behavior.id, 'shapes', 'list'));
    stack.execute(new SetListItemsCommand(behavior.id, 'shapes', 'struct'));
    for (const key of ['x', 'y'])
      stack.execute(new AddStructFieldCommand(behavior.id, 'shapes', { key, kind: 'number' }));

    expect(structShapeOf(varOf(behavior, 'piece'))?.map((f) => f.key)).toEqual([
      'shape',
      'name',
      'held',
      'tint',
      'cells',
    ]);
    expect(structShapeOf(varOf(behavior, 'shapes'))?.map((f) => f.key)).toEqual(['x', 'y']);
  });

  it('is absent for a variable that declares no bundle', () => {
    const fixture = behaviorWithPiece();
    const { behavior, stack } = fixture;
    stack.execute(new AddVariableCommand(behavior.id, 'score', 'number'));
    stack.execute(new AddVariableCommand(behavior.id, 'names', 'list'));

    expect(structShapeOf(varOf(behavior, 'score'))).toBeUndefined();
    expect(structShapeOf(varOf(behavior, 'names'))).toBeUndefined();
  });

  /** A color is stored as a number and the graph has no port kind for it – every other kind is itself. */
  it('reads a color field as a number port and a list field as a list port', () => {
    expect(PIECE.map(fieldPortKind)).toEqual<DeclaredPortKind[]>([
      'number',
      'text',
      'boolean',
      'number',
      'list',
    ]);
  });
});

describe('seeding a node from that shape', () => {
  it('leaves a field the node already declares alone', () => {
    const { behavior, stack, edit } = behaviorWithPiece();
    const pack = edit.addNode('PackStruct');
    stack.execute(new AddPortCommand(behavior.id, pack.id, { key: 'shape', kind: 'text' }));

    const ports = missingFieldPorts(pack, structShapeOf(varOf(behavior, 'piece')) ?? []);
    expect(ports.map((p) => p.key)).toEqual(['name', 'held', 'tint', 'cells']);
  });

  it('adds every field as one undo step, and the ports become inputs of the Pack', () => {
    const fixture = behaviorWithPiece();
    const { behavior, stack, edit } = fixture;
    const pack = edit.addNode('PackStruct');
    const ports = missingFieldPorts(pack, structShapeOf(varOf(behavior, 'piece')) ?? []);
    stack.execute(new AddPortsCommand(behavior.id, pack.id, ports));

    const inputs = resolveDef(pack, behavior.graph, behaviorLookup(fixture.project))!.inputs;
    expect(inputs.map((p) => `${p.key}:${p.type}`)).toEqual([
      'shape:number',
      'name:string',
      'held:boolean',
      'tint:number',
      'cells:list',
    ]);

    stack.undo();
    expect(pack.ports ?? []).toEqual([]);
  });

  /** All-or-nothing: a clash halfway down must not leave the node with the fields before it. */
  it('adds nothing at all when one of the ports clashes', () => {
    const { behavior, stack, edit } = behaviorWithPiece();
    const pack = edit.addNode('PackStruct');
    stack.execute(new AddPortCommand(behavior.id, pack.id, { key: 'held', kind: 'boolean' }));

    expect(() =>
      stack.execute(
        new AddPortsCommand(
          behavior.id,
          pack.id,
          PIECE.map((f) => ({ key: f.key, kind: 'number' })),
        ),
      ),
    ).toThrow('"held" already exists');
    expect((pack.ports ?? []).map((p) => p.key)).toEqual(['held']);
  });

  /** A field may be called `exec`, a port may not – the one name where a shape does not fit a node. */
  it('rejects a shape whose field is called exec, and says why', () => {
    const { behavior, stack, edit } = behaviorWithPiece();
    stack.execute(new AddStructFieldCommand(behavior.id, 'piece', { key: 'exec', kind: 'number' }));
    const pack = edit.addNode('PackStruct');
    const ports = missingFieldPorts(pack, structShapeOf(varOf(behavior, 'piece')) ?? []);

    expect(() => stack.execute(new AddPortsCommand(behavior.id, pack.id, ports))).toThrow(
      'taken by the flow port',
    );
    expect(pack.ports ?? []).toEqual([]);
  });
});