using Common;
using System;
using System.Threading;
using System.Windows.Threading;

namespace MultiTerm.Wpf;

/// <summary>
/// Provides an implementation of the <see cref="IContext"/> for WPF.
/// </summary>
public class WpfContext : IContext
{
    private readonly Dispatcher dispatcher;

    public bool IsSynchronized
    {
        get
        {
            return this.dispatcher.Thread == Thread.CurrentThread;
        }
    }

    /// <summary>
    /// Instanciates a <see cref="WpfContext"/> using the CurrentDispatcher.
    /// </summary>
    public WpfContext() : this(Dispatcher.CurrentDispatcher) { }

    /// <summary>
    /// Instanciates a <see cref="WpfContext"/> using the given <paramref name="dispatcher"/>.
    /// </summary>
    public WpfContext(Dispatcher dispatcher)
    {
        // guard null
        if(dispatcher == null) { throw new ArgumentNullException(nameof(dispatcher)); }

        this.dispatcher = dispatcher;
    }

    public void BeginInvoke(Action action)
    {
        // guard null
        if (action == null) { throw new ArgumentNullException(nameof(action)); }

        this.dispatcher.BeginInvoke(action);
    }

    public void Invoke(Action action)
    {
        // guard null
        if (action == null) { throw new ArgumentNullException(nameof(action)); }

        this.dispatcher.Invoke(action);
    }
}