using LiteDB;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Threading;
using Tango.Core.Commands;
using Tango.Core.IO;
using Tango.Logging;

namespace Tango.Core
{
    /// <summary>
    /// Represents an extension to the standard core object with support for property and relay commands changed event.
    /// </summary>
    /// <seealso cref="System.ComponentModel.INotifyPropertyChanged" />
    [Serializable]
    public class ExtendedObject : INotifyPropertyChanged
    {
        /// <summary>
        /// Occurs when after InvalidateRelayCommands is called.
        /// </summary>
        [field: NonSerialized]
        public event EventHandler RelayCommandsInvalidated;

        /// <summary>
        /// Gets the default log manager.
        /// </summary>
        [JsonIgnore]
        [NotMapped]
        [BsonIgnore]
        public LogManager LogManager
        {
            get { return LogManager.Default; }
        }

        /// <summary>
        /// Gets the temporary manager.
        /// </summary>
        [JsonIgnore]
        [NotMapped]
        [BsonIgnore]
        public TemporaryManager TemporaryManager
        {
            get { return TemporaryManager.Default; }
        }

        /// <summary>
        /// Occurs when a property has changed.
        /// </summary>
        [field: NonSerialized]
        public event PropertyChangedEventHandler PropertyChanged;

        /// <summary>
        /// Raises the property changed event.
        /// </summary>
        /// <param name="propName">Name of the property.</param>
        protected virtual void RaisePropertyChanged(String propName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
        }

        /// <summary>
        /// Raises the property changed event.
        /// </summary>
        /// <param name="propName">Name of the property.</param>
        protected virtual void RaisePropertyChangedAuto([CallerMemberName] string caller = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(caller));
        }

        /// <summary>
        /// Raises all relay commands CanExecute methods in the current instance.
        /// </summary>
        protected virtual void InvalidateRelayCommands()
        {
            InvokeUI(() =>
            {
                foreach (var prop in this.GetType().GetProperties().Where(x => typeof(RelayCommand).IsAssignableFrom(x.PropertyType)))
                {
                    var value = prop.GetValue(this) as RelayCommand;

                    if (value != null)
                    {
                        value.RaiseCanExecuteChanged();
                    }
                }

                RelayCommandsInvalidated?.Invoke(this, new EventArgs());
            });
        }

        /// <summary>
        /// Gets a value indicating whether we are currently in VS design mode.
        /// </summary>
        [NotMapped]
        [JsonIgnore]
        [BsonIgnore]
        public bool DesignMode
        {
            get { return (DesignerProperties.GetIsInDesignMode(new DependencyObject())); }
        }

        /// <summary>
        /// Invokes the specified action on the UI Thread.
        /// </summary>
        /// <param name="action">The action.</param>
        protected virtual void InvokeUI(Action action)
        {
            if (Application.Current != null)
            {
                Application.Current.Dispatcher.BeginInvoke(action);
            }
            else
            {
                action();
            }
        }

        /// <summary>
        /// Invokes the specified action on the UI Thread when context is idle.
        /// </summary>
        /// <param name="action">The action.</param>
        protected virtual void InvokeUIOnIdle(Action action)
        {
            Application.Current.Dispatcher.BeginInvoke(action, DispatcherPriority.ContextIdle);
        }

        /// <summary>
        /// Invokes the specified action on the UI Thread.
        /// </summary>
        /// <param name="action">The action.</param>
        protected virtual void InvokeUINow(Action action)
        {
            Application.Current.Dispatcher.Invoke(action);
        }
    }
}