/* SettingsViewModelTest.cs
 * part of zaaReloaded2
 * 
 * Copyright 2015 Daniel Kraus
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NUnit.Framework;
using zaaReloaded2.ViewModels;
using zaaReloaded2.Controller;
using zaaReloaded2.Controller.Elements;

namespace Tests.ViewModels
{
    [TestFixture]
    class SettingsViewModelTest
    {
        SettingsViewModel _settingsVM;

        [SetUp]
        public void SetUp()
        {
            _settingsVM = new SettingsViewModel();
        }

        [Test]
        public void AddElement()
        {
            bool messageSent = false;
            Settings model = _settingsVM.RevealModelObject() as Settings;
            int oldViewModelElementCount = _settingsVM.Elements.Count;
            int oldModelElementCount = model.Elements.Count;
            _settingsVM.AddElementMessage.Sent += (sender, args) =>
            {
                messageSent = true;
                ElementPickerViewModel picker = args.Content.ViewModel as ElementPickerViewModel;
                Assert.IsNotNull(picker, "ViewModel in MessageContent is not an ElementPickerViewModel");
                picker.Categories.First().Children.First().IsSelected = true;
                picker.ChooseElementCommand.Execute(null);
            };
            _settingsVM.AddElementCommand.Execute(null);
            Assert.IsTrue(messageSent, "Message was not sent");
            Assert.AreEqual(oldViewModelElementCount + 1, _settingsVM.Elements.Count,
                "Count of elements in ViewModel was not increased by 1");
            Assert.AreEqual(oldModelElementCount + 1, model.Elements.Count,
                "Count of elements in settings Model was not increased by 1");
        }

        [Test]
        public void AddChildElement()
        {
            bool messageSent = false;
            SelectEachDay model = new SelectEachDay();
            ControlElementViewModel viewModel = new ControlElementViewModel(model);
            _settingsVM.AddElementViewModel(viewModel);
            viewModel.IsSelected = true;
            int oldViewModelChildrenCount = viewModel.Elements.Count;
            int oldModelChildrenCount = model.FormatElements.Count;
            _settingsVM.AddChildElementMessage.Sent += (sender, args) =>
            {
                messageSent = true;
                ElementPickerViewModel picker = args.Content.ViewModel as ElementPickerViewModel;
                Assert.IsNotNull(picker, "ViewModel in MessageContent is not an ElementPickerViewModel");
                picker.Categories.First().Children.First().IsSelected = true;
                Assert.IsTrue(picker.ChooseElementCommand.CanExecute(null),
                    "Cannot execute element picker's ChooseElementCommand.");
                picker.ChooseElementCommand.Execute(null);
            };
            _settingsVM.AddChildElementCommand.Execute(null);
            Assert.IsTrue(messageSent, "Message was not sent");
            Assert.AreEqual(oldViewModelChildrenCount + 1, viewModel.Elements.Count,
                "Count of children in ViewModel was not increased by 1");
            Assert.AreEqual(oldModelChildrenCount + 1, model.FormatElements.Count,
                "Count of children in Model was not increased by 1");
        }

        [Test]
        public void CannotAddChildElementToFormatElement()
        {
            ControlElementViewModel parent = new ControlElementViewModel(
                new SelectFirstDay());
            _settingsVM.AddElementViewModel(parent);
            parent.IsSelected = true;
            Assert.IsTrue(_settingsVM.AddChildElementCommand.CanExecute(null));
            FormatElementViewModel child = new FormatElementViewModel(new Items());
            _settingsVM.AddChildElementViewModel(parent, child);
            parent.IsSelected = false;
            child.IsSelected = true;
            Assert.IsFalse(_settingsVM.AddChildElementCommand.CanExecute(null));
        }

        [Test]
        public void DeleteElement()
        {
            Settings settings = new Settings();
            settings.AddElement(new SelectFirstDay());
            settings.AddElement(new SelectEachDay());
            settings.AddElement(new SelectLastDay());
            SettingsViewModel settingsVM = new SettingsViewModel(settings);
            int oldCount = settingsVM.Elements.Count;
            ElementViewModel elementVM = settingsVM.Elements.First();
            ElementBase element = elementVM.RevealModelObject() as ElementBase;
            Assert.IsTrue(settings.Elements.Contains(element),
                "Settings object does not contain the model that the VM revealed?!");
            elementVM.IsSelected = true;
            Assert.IsTrue(settingsVM.DeleteElementCommand.CanExecute(null),
                "DeleteElementCommand should be enabled.");
            settingsVM.DeleteElementCommand.Execute(null);
            Assert.AreEqual(oldCount - 1, settingsVM.Elements.Count);
            Assert.IsFalse(settingsVM.Elements.Contains(elementVM),
                "Elements collection still contains the deleted element view model.");
            Assert.IsFalse(settings.Elements.Contains(element),
                "Settings' Element collection still contains the element model.");
        }

        [Test]
        public void DeleteChildElement()
        {
            Settings settings = new Settings();
            settings.AddElement(new SelectFirstDay(new Items()));
            settings.AddElement(new SelectEachDay());
            settings.AddElement(new SelectLastDay());
            SettingsViewModel settingsVM = new SettingsViewModel(settings);
            ControlElementViewModel parent = ((ControlElementViewModel)settingsVM.Elements.First());
            int oldCount = parent.Elements.Count;
            ElementViewModel elementVM = ((ControlElementViewModel)settingsVM.Elements.First())
                .Elements.First();
            ElementBase element = elementVM.RevealModelObject() as ElementBase;
            Assert.IsTrue(((ControlElementBase)settings.Elements[0]).FormatElements.Contains(element),
                "Settings object does not contain the model that the VM revealed?!");
            elementVM.IsSelected = true;
            Assert.IsTrue(settingsVM.DeleteElementCommand.CanExecute(null),
                "DeleteElementCommand should be enabled.");
            settingsVM.DeleteElementCommand.Execute(null);
            Assert.AreEqual(oldCount - 1, parent.Elements.Count);
            Assert.IsFalse(parent.Elements.Contains(elementVM),
                "Elements collection still contains the deleted element view model.");
            Assert.IsFalse(((ControlElementBase)settings.Elements[0]).FormatElements.Contains(element),
                "Settings' collection of FormatElement children still contains the element model.");
        }

        [Test]
        public void CopyElement()
        {
            string testString = "this text should be duplicated";
            _settingsVM.AddElementViewModel(
                new ControlElementViewModel(new SelectEachDay(new Items(testString))));
            int oldCount = _settingsVM.Elements.Count;
            _settingsVM.Elements.First().IsSelected = true;
            Assert.IsTrue(_settingsVM.CopyElementCommand.CanExecute(null),
                "CopyElementCommand should be enabled.");
            _settingsVM.CopyElementCommand.Execute(null);
            Assert.AreEqual(oldCount + 1, _settingsVM.Elements.Count);

            // Access the first element
            ControlElementViewModel controlVM = _settingsVM.Elements.First() as ControlElementViewModel;
            FormatElementViewModel formatVM = controlVM.Elements.First() as FormatElementViewModel;
            Items items = formatVM.RevealModelObject() as Items;
            Assert.IsNotNull(items,
                "Child ViewModel of first ControlElementViewModel does not wrap Items object.");
            Assert.AreEqual(testString, items.Content,
                "First control element's child element has incorrect Content string.");

            // Access the second element
            controlVM = _settingsVM.Elements.Last() as ControlElementViewModel;
            formatVM = controlVM.Elements.First() as FormatElementViewModel;
            items = formatVM.RevealModelObject() as Items;
            Assert.IsNotNull(items,
                "Child ViewModel of last ControlElementViewModel does not wrap Items object.");
            Assert.AreEqual(testString, items.Content,
                "First control element's child element has incorrect Content string.");
        }
    }
}