// Author: Gockner, Simon
// Created: 2021-04-07
// Copyright(c) 2021 SimonG. All Rights Reserved.

using Lib.Audio.Controls.Buttons.Interfaces;
using Lib.Audio.Interfaces;
using Lib.Midi.Messages;
using Lib.Midi.Messages.Interfaces;

namespace Lib.Audio.Controls.Buttons
{
    public class Button : IButton //TODO: Make abstract?
    {
        private readonly int _channelNumber;
        
        public Button(int noteNumber, int channelNumber)
        {
            NoteNumber = noteNumber;
            _channelNumber = channelNumber;
        }

        public int NoteNumber { get; }
        protected bool IsActive { get; private set; }
        
        public virtual IMidiMessage? HandlePressed(IControllable? controllable, Velocity velocity)
        {
            if (velocity != Velocity.On)
                return null;
            
            IsActive = !IsActive;
            Handle(controllable);

            return IsActive ? LedOn() : LedOff();
        }

        public IMidiMessage ToggleLed(LedState ledState) => ledState == LedState.Off ? LedOff() : LedOn();
        protected virtual void Handle(IControllable? controllable)
        {
            
        }

        private IMidiMessage LedOn() => new NoteOnMessage(0, _channelNumber, NoteNumber, (int) Velocity.On, 0);
        private IMidiMessage LedOff() => new NoteMessage(0, _channelNumber, NoteNumber, (int) Velocity.Off);
    }
}