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const redux = require('redux');
const createStore = redux.createStore;

const initialState = {
	counter: 0
}

//Reducer
const rootReducer = (state = initialState, action) => {
	if (action.type === 'INC_COUNTER') {
		return {
			...state,
			counter: state.counter + 1
		}
	}
	if (action.type === 'ADD_COUNTER') {
		return {
			...state,
			counter: state.counter + action.value
		}
	}
	return state;
}

//Store
const store = createStore(rootReducer);
console.log(store.getState());

//Subscription(calls function passed to it every time an action is beeing dispatched)
store.subscribe(() => {
	console.log('[Subscription]', store.getState());
})

//Dispatching Action
store.dispatch({type: 'INC_COUNTER'});
store.dispatch({type: 'ADD_COUNTER', value: 10});
console.log(store.getState());

import * as actionTypes from './actions';

const initialState = {
	counter: 0,
	results: []
}

const reducer = (state = initialState, action) => {
	switch (action.type) {
		case actionTypes.INCREMENT:
			return {
				...state,
				counter: state.counter + 1
			}
		case actionTypes.DECREMENT:
			return {
				...state,
				counter: state.counter - 1
			}
		case actionTypes.ADD:
			return {
				...state,
				counter: state.counter + action.val
			}
		case actionTypes.SUBTRACT:
			return {
				...state,
				counter: state.counter - action.val
			}
		case actionTypes.STORE_RESULT:
			return {
				...state,
				results: state.results.concat({id: new Date(), value: state.counter})
			}
		case actionTypes.DELETE_RESULT:
			// const id = 2;
			// const newArray = [...state.results];
			// newArray.splice(id, 1);
			const updatedArray = state.results.filter(result => result.id !== action.resultId)
			return {
				...state,
				results: updatedArray
			}
	}
	return state;
}

export default reducer;