import * as R from 'ramda';
import { inc, add } from 'ramda';
import { makeAction } from '../actions/actions';
import { reducerFn, mapReducers, mapStructReducers } from './reducers';
let cls = makeAction('book', 'create');
let action = new cls('foo');

describe('reducerFn', () => {
  it('should make a reducer function from a type map and initial state', () => {
    let reducer = reducerFn({ inc: R.inc }, 0);
    // Action:: { type, payload }
    expect(reducer(0, { type:'inc' })).toEqual(1);
  })
})

describe('mapReducers', () => {
  it('should map [ReducerMap, State] tuples to `(State, Action) ~> State` reducers', () => {
    let reducerObj = mapReducers({ inc: R.inc });
    expect(reducerObj['inc'](0, { type: 'inc', payload: null })).toEqual(1);
  })
})

describe('mapStructReducers', () => {
  it('should map [ReducerStructMap, State] tuples to `(State, Action) ~> State` reducers', () => {
    let reducerObj = mapStructReducers({
      fixed: { always123: 123 }, // v
      set: { doublePayload: R.multiply(2) }, // (payload) ~> state
      update: { inc }, // (state) ~> state
      edit: { add },  // (payload, state) ~> state
      misc: { misc: (state: number, amount: number) => state + amount }, // (state, payload) ~> state // default redux order, but sucks for FP
    });
    expect(reducerObj['edit'](0, { type: 'edit', payload: 2 })).toEqual(1);
  })
})