New Twiddle

actions.todos.js

import * as types from '../actions/types';

export const addTodo = text => dispatch => dispatch({type: types.ADD_TODO, text});
export const deleteTodo = id => dispatch => dispatch({type: types.DELETE_TODO, id});
export const editTodo = (id, text) => dispatch => dispatch({type: types.EDIT_TODO, id, text});
export const completeTodo = id => dispatch => dispatch({type: types.COMPLETE_TODO, id});
export const clearCompleted = () => dispatch => dispatch({type: types.CLEAR_COMPLETED});
export const showAll = () => dispatch => dispatch({type: types.SHOW_ALL});
export const showActive = () => dispatch => dispatch({type: types.SHOW_ACTIVE});
export const showCompleted = () => dispatch => dispatch({type: types.SHOW_COMPLETED});

actions.types.js

export const ADD_TODO = 'ADD_TODO';
export const DELETE_TODO = 'DELETE_TODO';
export const EDIT_TODO = 'EDIT_TODO';
export const COMPLETE_TODO = 'COMPLETE_TODO';
export const CLEAR_COMPLETED = 'CLEAR_COMPLETED';
export const SHOW_ALL = 'SHOW_ALL';
export const SHOW_ACTIVE = 'SHOW_ACTIVE';
export const SHOW_COMPLETED = 'SHOW_COMPLETED';

components.todo-item.js

import Ember from 'ember';
import { connect } from 'ember-redux';
import { editTodo, deleteTodo, completeTodo } from '../actions/todos';

const { get, set, run: { scheduleOnce } } = Ember;

const TodoItemComponent = Ember.Component.extend({
  tagName: 'li',
  editing: false,
  classNameBindings: ['todo.completed', 'editing'],
  actions: {
    startEditing() {
      set(this, 'editing', true);
    },
    doneEditing() {
      set(this, 'editing', false);
    },
    focusInput() {
      scheduleOnce('afterRender', this, () => {
        this.element.querySelector('input.edit').focus();
      });
    },
    handleKeydown(e) {
      if (e.keyCode === 13) {
        e.target.blur();
      } else if (e.keyCode === 27) {
        set(this, 'editing', false);
      }
    }
  }
});

const dispatchToActions = {
  deleteTodo,
  completeTodo,
  editTodo
}

export default connect(null, dispatchToActions)(TodoItemComponent);

components.todo-list.js

import Ember from 'ember';
import { connect } from 'ember-redux';
import { getTodos } from '../reducers/todos';

const TodoListComponent = Ember.Component.extend({
  tagName: 'ul',
  classNames: 'todo-list'
});

const stateToComputed = state => ({
  todos: getTodos(state)
});

export default connect(stateToComputed)(TodoListComponent);

components.todos-count.js

import Ember from 'ember';

const { get, computed } = Ember;

export default Ember.Component.extend({
  tagName: 'span',
  classNames: 'todo-count',
  itemWord: computed('todosCount', function() {
    let count = get(this, 'todosCount');
    return count > 1 ? 'items' : 'item';
  })
});

components.ui-footer.js

import Ember from 'ember';
import { connect } from 'ember-redux';
import { getFilter, getTodosCount, getCompletedCount, getAllTodosCount } from '../reducers/todos';
import { clearCompleted, showAll, showActive, showCompleted } from '../actions/todos';

const stateToComputed = state => ({
  filter: getFilter(state),
  allCount: getAllTodosCount(state),
  todosCount: getTodosCount(state),
  completedCount: getCompletedCount(state)
});

const dispatchToActions = {
  clearCompleted,
  showAll,
  showActive,
  showCompleted
};

const FooterComponent = Ember.Component.extend({
  tagName: 'footer',
  classNames: 'footer'
});

export default connect(stateToComputed, dispatchToActions)(FooterComponent);

components.ui-header.js

import Ember from 'ember';
import { connect } from 'ember-redux';
import { addTodo } from '../actions/todos';

const HeaderComponent = Ember.Component.extend({
  text: '',
  tagName: 'header',
  classNames: 'header'
});

const dispatchToActions = {
  addTodo
}

export default connect(null, dispatchToActions)(HeaderComponent);

components.ui-layout.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: 'todoapp'
});

components.ui-section.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'section',
  classNames: 'main'
});

helpers.gt.js

import Ember from 'ember';

export function gt([n1, n2]) {
  return n1 > n2;
}

export default Ember.Helper.helper(gt);

helpers.is-equal.js

import Ember from 'ember';

export default Ember.Helper.helper(function(params) {
  return params[0] === params[1];
});

helpers.pipe.js

import Ember from 'ember';

export function invokeFunction(acc, curr) {
  return curr(acc);
}

export function pipe(actions = []) {
  return function(...args) {
    return actions.reduce((acc, curr, idx) => {
      if (idx === 0) {
        return curr(...args);
      }

      return invokeFunction(acc, curr);
    }, undefined);
  };
}

export default Ember.Helper.helper(pipe);

reducers.index.js

import { combineReducers } from 'redux'
import todos from './todos'

const rootReducer = combineReducers({
  todos
})

export default rootReducer

reducers.todos.js

import reselect from 'reselect';
import mapValues from 'lodash/mapValues';
import omitBy from 'lodash/omitBy';
import merge from 'lodash/merge';
import omit from 'lodash/omit';
import defaults from 'lodash/defaults';
import * as types from '../actions/types';

const { createSelector } = reselect;

const initialState = {
  filter: undefined,
  all: {
    1: {
      id: 1,
      text: 'Use Ember Redux',
      completed: false
    }
  }
};

export default function todos(state, action) {
  switch (action.type) {
    case types.CLEAR_COMPLETED: {
      let todos = omitBy(state.all, todo => todo.completed === true);
      return Object.assign({}, state, { all: todos });
    }

    case types.SHOW_ACTIVE: {
      return Object.assign({}, state, { filter: false });
    }

    case types.SHOW_COMPLETED: {
      return Object.assign({}, state, { filter: true });
    }

    case types.SHOW_ALL: {
      return Object.assign({}, state, { filter: undefined });
    }

    case types.DELETE_TODO: {
      let todos = omit(state.all, [action.id]);
      return Object.assign({}, state, { all: todos });
    }

    case types.EDIT_TODO: {
      let todos = mapValues(state.all, todo => {
        return todo.id === action.id ? defaults({
          text: action.text
        }, todo) : todo;
      });
      return Object.assign({}, state, { all: todos });
    }

    case types.COMPLETE_TODO: {
      let todos = mapValues(state.all, todo => {
        return todo.id === action.id ? defaults({
          completed: !todo.completed
        }, todo) : todo;
      });
      return Object.assign({}, state, { all: todos });
    }

    case types.ADD_TODO: {
      const id = Object.values(state.all).reduce((maxId, todo) => Math.max(todo.id, maxId), -1) + 1;
      let todo = {
        [id]: {
          id: id,
          completed: false,
          text: action.text
        }
      }
      let todos = merge({}, state.all, todo);
      return Object.assign({}, state, { all: todos });
    }

    default: {
      return state || initialState;
    }
  }
}

const all = state => state.todos.all;
const filter = state => state.todos.filter;

export const getTodos = createSelector(
  all,
  filter,
  (all, filter) => {
    return omitBy(all, todo => {
      return filter === undefined ? false : filter !== todo.completed;
    });
  }
);

export const getAllTodosCount = createSelector(all, (all) => Object.values(all).length);
export const getFilter = createSelector(filter, filter => filter);
export const getTodosCount = createSelector(getTodos, (todos) => Object.values(todos).length);
export const getCompletedCount = createSelector(all, (all) => Object.values(all).filter(t => t.completed).length);

styles.app.css

html,
body {
	margin: 0;
	padding: 0;
}

button {
	margin: 0;
	padding: 0;
	border: 0;
	background: none;
	font-size: 100%;
	vertical-align: baseline;
	font-family: inherit;
	font-weight: inherit;
	color: inherit;
	-webkit-appearance: none;
	appearance: none;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

body {
	font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
	line-height: 1.4em;
	background: #f5f5f5;
	color: #4d4d4d;
	min-width: 230px;
	max-width: 550px;
	margin: 0 auto;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	font-weight: 300;
}

:focus {
	outline: 0;
}

.hidden {
	display: none;
}

.todoapp {
	background: #fff;
	margin: 130px 0 40px 0;
	position: relative;
	box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2),
	            0 25px 50px 0 rgba(0, 0, 0, 0.1);
}

.todoapp input::-webkit-input-placeholder {
	font-style: italic;
	font-weight: 300;
	color: #e6e6e6;
}

.todoapp input::-moz-placeholder {
	font-style: italic;
	font-weight: 300;
	color: #e6e6e6;
}

.todoapp input::input-placeholder {
	font-style: italic;
	font-weight: 300;
	color: #e6e6e6;
}

.todoapp h1 {
	position: absolute;
	top: -155px;
	width: 100%;
	font-size: 100px;
	font-weight: 100;
	text-align: center;
	color: rgba(175, 47, 47, 0.15);
	-webkit-text-rendering: optimizeLegibility;
	-moz-text-rendering: optimizeLegibility;
	text-rendering: optimizeLegibility;
}

.new-todo,
.edit {
	position: relative;
	margin: 0;
	width: 100%;
	font-size: 24px;
	font-family: inherit;
	font-weight: inherit;
	line-height: 1.4em;
	border: 0;
	color: inherit;
	padding: 6px;
	border: 1px solid #999;
	box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
	box-sizing: border-box;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

.new-todo {
	padding: 16px 16px 16px 60px;
	border: none;
	background: rgba(0, 0, 0, 0.003);
	box-shadow: inset 0 -2px 1px rgba(0,0,0,0.03);
}

.main {
	position: relative;
	z-index: 2;
	border-top: 1px solid #e6e6e6;
}

.toggle-all {
	text-align: center;
	border: none; /* Mobile Safari */
	opacity: 0;
	position: absolute;
}

.toggle-all + label {
	width: 60px;
	height: 34px;
	font-size: 0;
	position: absolute;
	top: -52px;
	left: -13px;
	-webkit-transform: rotate(90deg);
	transform: rotate(90deg);
}

.toggle-all + label:before {
	content: '❯';
	font-size: 22px;
	color: #e6e6e6;
	padding: 10px 27px 10px 27px;
}

.toggle-all:checked + label:before {
	color: #737373;
}

.todo-list {
	margin: 0;
	padding: 0;
	list-style: none;
}

.todo-list li {
	position: relative;
	font-size: 24px;
	border-bottom: 1px solid #ededed;
}

.todo-list li:last-child {
	border-bottom: none;
}

.todo-list li.editing {
	border-bottom: none;
	padding: 0;
}

.todo-list li.editing .edit {
	display: block;
	width: 506px;
	padding: 12px 16px;
	margin: 0 0 0 43px;
}

.todo-list li.editing .view {
	display: none;
}

.todo-list li .toggle {
	text-align: center;
	width: 40px;
	/* auto, since non-WebKit browsers doesn't support input styling */
	height: auto;
	position: absolute;
	top: 0;
	bottom: 0;
	margin: auto 0;
	border: none; /* Mobile Safari */
	-webkit-appearance: none;
	appearance: none;
}

.todo-list li .toggle {
	opacity: 0;
}

.todo-list li .toggle + label {
	/*
		Firefox requires `#` to be escaped - https://bugzilla.mozilla.org/show_bug.cgi?id=922433
		IE and Edge requires *everything* to be escaped to render, so we do that instead of just the `#` - https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7157459/
	*/
	background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23ededed%22%20stroke-width%3D%223%22/%3E%3C/svg%3E');
	background-repeat: no-repeat;
	background-position: center left;
}

.todo-list li .toggle:checked + label {
	background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23bddad5%22%20stroke-width%3D%223%22/%3E%3Cpath%20fill%3D%22%235dc2af%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22/%3E%3C/svg%3E');
}

.todo-list li label {
	word-break: break-all;
	padding: 15px 15px 15px 60px;
	display: block;
	line-height: 1.2;
	transition: color 0.4s;
}

.todo-list li.completed label {
	color: #d9d9d9;
	text-decoration: line-through;
}

.todo-list li .destroy {
	display: none;
	position: absolute;
	top: 0;
	right: 10px;
	bottom: 0;
	width: 40px;
	height: 40px;
	margin: auto 0;
	font-size: 30px;
	color: #cc9a9a;
	margin-bottom: 11px;
	transition: color 0.2s ease-out;
}

.todo-list li .destroy:hover {
	color: #af5b5e;
}

.todo-list li .destroy:after {
	content: '×';
}

.todo-list li:hover .destroy {
	display: block;
}

.todo-list li .edit {
	display: none;
}

.todo-list li.editing:last-child {
	margin-bottom: -1px;
}

.footer {
	color: #777;
	padding: 10px 15px;
	height: 20px;
	text-align: center;
	border-top: 1px solid #e6e6e6;
}

.footer:before {
	content: '';
	position: absolute;
	right: 0;
	bottom: 0;
	left: 0;
	height: 50px;
	overflow: hidden;
	box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2),
	            0 8px 0 -3px #f6f6f6,
	            0 9px 1px -3px rgba(0, 0, 0, 0.2),
	            0 16px 0 -6px #f6f6f6,
	            0 17px 2px -6px rgba(0, 0, 0, 0.2);
}

.todo-count {
	float: left;
	text-align: left;
}

.todo-count strong {
	font-weight: 300;
}

.filters {
	margin: 0;
	padding: 0;
	list-style: none;
	position: absolute;
	right: 0;
	left: 0;
}

.filters li {
	display: inline;
}

.filters li a {
	color: inherit;
	margin: 3px;
	padding: 3px 7px;
	text-decoration: none;
	border: 1px solid transparent;
	border-radius: 3px;
}

.filters li a:hover {
	border-color: rgba(175, 47, 47, 0.1);
}

.filters li a.selected {
	border-color: rgba(175, 47, 47, 0.2);
}

.clear-completed,
html .clear-completed:active {
	float: right;
	position: relative;
	line-height: 20px;
	text-decoration: none;
	cursor: pointer;
}

.clear-completed:hover {
	text-decoration: underline;
}

.info {
	margin: 65px auto 0;
	color: #bfbfbf;
	font-size: 10px;
	text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
	text-align: center;
}

.info p {
	line-height: 1;
}

.info a {
	color: inherit;
	text-decoration: none;
	font-weight: 400;
}

.info a:hover {
	text-decoration: underline;
}

/*
	Hack to remove background from Mobile Safari.
	Can't use it globally since it destroys checkboxes in Firefox
*/
@media screen and (-webkit-min-device-pixel-ratio:0) {
	.toggle-all,
	.todo-list li .toggle {
		background: none;
	}

	.todo-list li .toggle {
		height: 40px;
	}
}

@media (max-width: 430px) {
	.footer {
		height: 50px;
	}

	.filters {
		bottom: 10px;
	}
}

templates.application.hbs

{{ui-layout}}

templates.components.footer-markup.hbs

{{#todos-count todosCount=props.todosCount as |itemWord|}}<strong>{{props.todosCount}}</strong> {{itemWord}} left{{/todos-count}}
<ul class="filters">
  <li><a onclick={{action props.showAll}} class={{if (is-equal props.filter) "selected"}} style="cursor: pointer;">All</a></li>
  <li><a onclick={{action props.showActive}} class={{if (is-equal props.filter false) "selected"}} style="cursor: pointer;">Active</a></li>
  <li><a onclick={{action props.showCompleted}} class={{if (is-equal props.filter true) "selected"}} style="cursor: pointer;">Completed</a></li>
</ul>
{{#if (gt props.completedCount 0)}}
  <button onclick={{action props.clearCompleted}} class="clear-completed">Clear completed</button>
{{/if}}

templates.components.header-markup.hbs

<h1>todos</h1>
<form {{action (pipe (action props.addTodo props.text) (action (mut props.text) "")) on="submit"}}>
  <input type="text" class="new-todo" placeholder="What needs to be done?" value={{props.text}} oninput={{action (mut props.text) value="target.value"}} autofocus>
  <input style="display: none" type="submit" value="submit" />
</form>

templates.components.todo-item.hbs

{{yield (hash
  deleteTodo=(action "deleteTodo" todo.id)
  completeTodo=(action "completeTodo" todo.id)
  editTodo=(action "editTodo" todo.id)
  handleKeydown=(action "handleKeydown")
  focusInput=(action "focusInput")
  startEditing=(action "startEditing")
  doneEditing=(action "doneEditing"))
}}

templates.components.todo-list.hbs

{{yield todos}}

templates.components.todo-markup.hbs

<div class="view">
  <input type="checkbox" checked={{todo.completed}} class="toggle" onchange={{action props.completeTodo}}>
  <label ondblclick={{action (pipe (action props.startEditing) (action props.focusInput))}}>{{todo.text}}</label>
  <button class="destroy" onclick={{action props.deleteTodo}}></button>
</div>
<input type="text" class="edit" value={{todo.text}} onblur={{action (pipe (action props.editTodo value="target.value") (action props.doneEditing))}} onkeydown={{action props.handleKeydown}}>

templates.components.todos-count.hbs

{{yield itemWord}}

templates.components.ui-footer.hbs

{{#if (gt allCount 0)}}
  {{yield (hash
    filter=filter
    todosCount=todosCount
    completedCount=completedCount
    clearCompleted=(action "clearCompleted")
    showAll=(action "showAll")
    showActive=(action "showActive")
    showCompleted=(action "showCompleted"))
  }}
{{/if}}

templates.components.ui-header.hbs

{{yield (hash text=text addTodo=(action "addTodo"))}}

templates.components.ui-layout.hbs

{{#ui-header as |props|}}
  {{header-markup props=props}}
{{/ui-header}}
{{#ui-section}}
  <input type="checkbox" class="toggle-all" value="on">
  {{#todo-list as |todos|}}
    {{#each-in todos as |key todo|}}
      {{#todo-item todo=todo as |props|}}
        {{todo-markup todo=todo props=props}}
      {{/todo-item}}
    {{/each-in}}
  {{/todo-list}}
{{/ui-section}}
{{#ui-footer as |props|}}
  {{footer-markup props=props}}
{{/ui-footer}}

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-redux": "4.0.0",
    "ember-reselect-shim": "2.0.0",
    "ember-lodash-es-shim": "1.1.0"
  }
}