using System;
using System.Reflection.PortableExecutable;

namespace OpenMacroBoard.SDK {
  /// <summary>
  /// Wraps an <see cref="IMacroBoard"/> and allows for hooks to implement "middle-ware" features.
  /// </summary>
  public abstract class MacroBoardAdapter : IMacroBoard {
    private readonly IMacroBoard macroBoard;
    private readonly Boolean leaveOpen;

    private Boolean disposed = false;

    /// <summary>
    /// Initializes a new instance of the <see cref="MacroBoardAdapter"/> class.
    /// </summary>
    /// <remarks>
    /// <para>When this instance is disposed, the underlying board is disposed as well.</para>
    /// </remarks>
    /// <param name="macroBoard">The macroBoard that is wrapped.</param>
    protected MacroBoardAdapter(IMacroBoard macroBoard) : this(macroBoard, false) {
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="MacroBoardAdapter"/> class.
    /// </summary>
    /// <param name="macroBoard">The macroBoard that is wrapped.</param>
    /// <param name="leaveOpen">When true, the underlying macroBoard will not be disposed with this instance.</param>
    protected MacroBoardAdapter(IMacroBoard macroBoard, Boolean leaveOpen) {
      this.macroBoard = macroBoard ?? throw new ArgumentNullException(nameof(macroBoard));
      this.leaveOpen = leaveOpen;

      macroBoard.ConnectionStateChanged += this.OnConnectionStateChanged;
      //macroBoard.KeyStateChanged += this.OnKeyStateChanged;
      macroBoard.ButtonPressed += this.MacroBoard_ButtonPressed;
      macroBoard.ButtonReleased += this.MacroBoard_ButtonReleased;
      macroBoard.TouchbarTouched += this.MacroBoard_TouchbarTouched;
      macroBoard.TouchbarPressed += this.MacroBoard_TouchbarPressed;
      macroBoard.TouchFlipEvent += this.MacroBoard_TouchFlipEvent;
      macroBoard.EncoderPressed += this.MacroBoard_EncoderPressed;
      macroBoard.EncoderReleased += this.MacroBoard_EncoderReleased;
      macroBoard.EncoderTurn += this.MacroBoard_EncoderTurn;
    }

    

    /// <summary>
    /// Finalizes an instance of the <see cref="MacroBoardAdapter"/> class.
    /// </summary>
    ~MacroBoardAdapter() {
      this.Dispose(false);
    }

    /// <inheritdoc/>
    //public event EventHandler<KeyEventArgs> KeyStateChanged;

    public event EventHandler<KeyPressEvent> ButtonPressed;
    public event EventHandler<KeyPressEvent> ButtonReleased;
    public event EventHandler<TouchTipEvent> TouchbarTouched;
    public event EventHandler<TouchTipEvent> TouchbarPressed;
    public event EventHandler<TouchFlipEvent> TouchFlipEvent;
    public event EventHandler<KnobPressEvent> EncoderPressed;
    public event EventHandler<KnobPressEvent> EncoderReleased;
    public event EventHandler<KnobTurnEvent> EncoderTurn;

    /// <inheritdoc/>
    public event EventHandler<ConnectionEventArgs> ConnectionStateChanged;

    /// <inheritdoc/>
    public virtual IKeyLayout Keys => this.macroBoard.Keys;

    /// <inheritdoc/>
    public virtual Boolean IsConnected => this.macroBoard.IsConnected;

    /// <inheritdoc/>
    public void Dispose() {
      this.Dispose(true);
      GC.SuppressFinalize(this);
    }

    /// <inheritdoc/>
    public virtual void SetBrightness(Byte percent) => this.macroBoard.SetBrightness(percent);

    /// <inheritdoc/>
    public virtual void SetButtonImage(Int32 keyId, KeyBitmap bitmapData) => this.macroBoard.SetButtonImage(keyId, bitmapData);

    /// <inheritdoc/>
    public void SetFullScreenImage(KeyBitmap bitmapData) => throw new NotImplementedException();

    /// <inheritdoc/>
    public virtual void SetWindowImage(KeyBitmap bitmapData) => throw new NotImplementedException();

    /// <inheritdoc/>
    public virtual void SetPartialWindowImage(Int32 x_pos, Int32 y_pos, KeyBitmap bitmapData) => throw new NotImplementedException();

    /// <inheritdoc/>
    public virtual void ShowLogo() => this.macroBoard.ShowLogo();

    /// <inheritdoc/>
    public String GetFirmwareVersion() => this.macroBoard.GetFirmwareVersion();

    /// <inheritdoc/>
    public String GetSerialNumber() => this.macroBoard.GetFirmwareVersion();

    // <summary>
    // Virtual KeyStateChanged event handler.
    // </summary>
    // <param name="sender">The sender of the original event.</param>
    // <param name="e">The event arguments.</param>
    //protected virtual void OnKeyStateChanged(Object sender, KeyEventArgs e) => KeyStateChanged?.Invoke(this, e);

    private void MacroBoard_EncoderTurn(Object sender, KnobTurnEvent e) => this.EncoderTurn?.Invoke(this, e);
    private void MacroBoard_EncoderReleased(Object sender, KnobPressEvent e) => this.EncoderReleased?.Invoke(this, e);
    private void MacroBoard_EncoderPressed(Object sender, KnobPressEvent e) => this.EncoderPressed?.Invoke(this, e);
    private void MacroBoard_TouchFlipEvent(Object sender, TouchFlipEvent e) => this.TouchFlipEvent?.Invoke(this, e);
    private void MacroBoard_TouchbarPressed(Object sender, TouchTipEvent e) => this.TouchbarPressed?.Invoke(this, e);
    private void MacroBoard_TouchbarTouched(Object sender, TouchTipEvent e) => this.TouchbarTouched?.Invoke(this, e);
    private void MacroBoard_ButtonReleased(Object sender, KeyPressEvent e) => this.ButtonReleased?.Invoke(this, e);
    private void MacroBoard_ButtonPressed(Object sender, KeyPressEvent e) => this.ButtonPressed?.Invoke(this, e);

    /// <summary>
    /// Virtual ConnectionStateChanged event handler.
    /// </summary>
    /// <param name="sender">The sender of the original event.</param>
    /// <param name="e">The event arguments.</param>
    protected virtual void OnConnectionStateChanged(Object sender, ConnectionEventArgs e) => ConnectionStateChanged?.Invoke(this, e);

    /// <summary>
    /// Protected implementation of Dispose pattern.
    /// </summary>
    /// <param name="disposing">True when called from <see cref="Dispose()"/> and false when called from the finalizer.</param>
    protected virtual void Dispose(Boolean disposing) {
      if(this.disposed) {
        return;
      }

      if(disposing && !this.leaveOpen) {
        this.macroBoard?.Dispose();
      }

      this.disposed = true;
    }
  }
}