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/*global jQuery, Handlebars, Router */
jQuery(function ($) {
'use strict';
Handlebars.registerHelper('eq', function (a, b, options) {
return a === b ? options.fn(this) : options.inverse(this);
});
Handlebars.registerHelper('computeTaskPriority', function (index) {
return 4 - (index % 5);
});
var util = {
uuid: function () {
/*jshint bitwise:false */
var i, random;
var uuid = '';
for (i = 0; i < 32; i++) {
random = Math.random() * 16 | 0;
if (i === 8 || i === 12 || i === 16 || i === 20) {
uuid += '-';
}
uuid += (i === 12 ? 4 : (i === 16 ? (random & 3 | 8) : random)).toString(16);
}
return uuid;
},
pluralize: function (count, word) {
return count === 1 ? word : word + 's';
},
store: function (namespace, data) {
return [];
}
};
var App = {
ENTER_KEY: 13,
ESCAPE_KEY: 27,
init: function () {
this.todos = util.store('todos-jquery');
this.todoTemplate = Handlebars.compile($('#todo-template').html());
this.footerTemplate = Handlebars.compile($('#footer-template').html());
this.bindEvents();
new Router({
'/:filter': function (filter) {
this.filter = filter;
this.render();
}.bind(this)
}).init('/all');
var dummyNodeToNotifyAppIsReady = document.createElement('div');
dummyNodeToNotifyAppIsReady.id = 'appIsReady';
document.body.appendChild(dummyNodeToNotifyAppIsReady);
},
bindEvents: function () {
$('#new-todo').on('keyup', this.create.bind(this));
$('#toggle-all').on('change', this.toggleAll.bind(this));
$('#footer').on('click', '.clear-completed', this.destroyCompleted.bind(this));
$('#todo-list')
.on('change', '.toggle', this.toggle.bind(this))
.on('dblclick', 'label', this.edit.bind(this))
.on('keyup', '.edit', this.editKeyup.bind(this))
.on('focusout', '.edit', this.update.bind(this))
.on('click', '.destroy', this.destroy.bind(this));
},
render: function () {
var todos = this.getFilteredTodos();
$('#todo-list').html(this.todoTemplate(todos));
$('#main').toggle(todos.length > 0);
$('#toggle-all').prop('checked', this.getActiveTodos().length === 0);
this.renderFooter();
$('#new-todo').focus();
util.store('todos-jquery', this.todos);
},
renderFooter: function () {
var todoCount = this.todos.length;
var activeTodoCount = this.getActiveTodos().length;
var template = this.footerTemplate({
activeTodoCount: activeTodoCount,
activeTodoWord: util.pluralize(activeTodoCount, 'item'),
completedTodos: todoCount - activeTodoCount,
filter: this.filter
});
$('#footer').toggle(todoCount > 0).html(template);
},
toggleAll: function (e) {
var isChecked = $(e.target).prop('checked');
this.todos.forEach(function (todo) {
todo.completed = isChecked;
});
this.render();
},
getActiveTodos: function () {
return this.todos.filter(function (todo) {
return !todo.completed;
});
},
getCompletedTodos: function () {
return this.todos.filter(function (todo) {
return todo.completed;
});
},
getFilteredTodos: function () {
if (this.filter === 'active') {
return this.getActiveTodos();
}
if (this.filter === 'completed') {
return this.getCompletedTodos();
}
return this.todos;
},
destroyCompleted: function () {
this.todos = this.getActiveTodos();
this.filter = 'all';
this.render();
},
// accepts an element from inside the `.item` div and
// returns the corresponding index in the `todos` array
indexFromEl: function (el) {
var id = $(el).closest('li').data('id');
var todos = this.todos;
var i = todos.length;
while (i--) {
if (todos[i].id === id) {
return i;
}
}
},
create: function (e) {
var $input = $(e.target);
var val = $.trim($input.val());
if (e.which !== this.ENTER_KEY || !val) {
return;
}
this.todos.push({
id: util.uuid(),
title: val,
completed: false
});
$input.val('');
this.render();
},
toggle: function (e) {
var i = this.indexFromEl(e.target);
this.todos[i].completed = !this.todos[i].completed;
this.render();
},
edit: function (e) {
var $input = $(e.target).closest('li').addClass('editing').find('.edit');
$input.val($input.val()).focus();
},
editKeyup: function (e) {
if (e.which === this.ENTER_KEY) {
e.target.blur();
}
if (e.which === this.ESCAPE_KEY) {
$(e.target).data('abort', true).blur();
}
},
update: function (e) {
var el = e.target;
var $el = $(el);
var val = $el.val().trim();
if (!val) {
this.destroy(e);
return;
}
if ($el.data('abort')) {
$el.data('abort', false);
} else {
this.todos[this.indexFromEl(el)].title = val;
}
this.render();
},
destroy: function (e) {
this.todos.splice(this.indexFromEl(e.target), 1);
this.render();
}
};
window.app = App;
window.app.init();
});