/* FormatElementViewModel.cs
 * part of zaaReloaded2
 * 
 * Copyright 2015-2017 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.Diagnostics;
using System.Linq;
using System.Text;
using Bovender.Mvvm;
using zaaReloaded2.Controller.Elements;

namespace zaaReloaded2.ViewModels
{
    public class FormatElementViewModel : ElementViewModel
    {
        #region Public properties

        public string Content
        {
            [DebuggerStepThrough]
            get { return _content; }
            set
            {
                _content = value;
                OnPropertyChanged("Content");
            }
        }

        /// <summary>
        /// Gets or sets the parent ControlElementViewModel, if
        /// there is any.
        /// </summary>
        public ControlElementViewModel Parent { get; set; }

        public override string ToolTip { get { return Element.Label; } }

        #endregion

        #region Commands

        public DelegatingCommand SaveCommand
        {
            get
            {
                if (_saveCommand == null)
                {
                    _saveCommand = new DelegatingCommand(
                        param => DoSave(),
                        param => CanSave());
                }
                return _saveCommand;
            }
        }

        #endregion

        #region Constructors

        public FormatElementViewModel() : base() { }

        public FormatElementViewModel(FormatElementBase formatElement)
            : this()
        {
            Element = formatElement;
            Content = ((FormatElementBase)Element).Content;
        }

        #endregion

        #region Overrides

        public override object Clone()
        {
            FormatElementViewModel clone = new FormatElementViewModel();
            clone.Parent = Parent;
            clone.Element = Element;
            return clone;
        }

        #endregion

        #region Private methods

        void DoSave()
        {
            ((FormatElementBase)Element).Content = _content;
            // Writing the _content field to the model affects our
            // DisplayString property; this is a hack to make it known.
            OnPropertyChanged("DisplayString");
            CloseViewCommand.Execute(null);
        }

        bool CanSave()
        {
            return !String.IsNullOrEmpty(Content);
        }

        #endregion

        #region Fields

        DelegatingCommand _saveCommand;
        string _content;

        #endregion
    }
}