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

using System;
using Lib.Audio.Controls.Interfaces;
using Lib.Driver.Xml;

namespace Lib.Audio.Controls
{
    public class Fader : IFader
    {
        private const float MIN_POSITION = 0; //TODO: calibrate? get from driver?
        private const float MAX_POSITION = 16256; //TODO: calibrate? get from driver?
            
        private int _position;

        public Fader(XmlFader xmlFader) => NoteNumber = xmlFader.NoteNumber;

        public int NoteNumber { get; }
        public int Position
        {
            get => _position;
            set
            {
                _position = value;
                PositionChanged?.Invoke(this, _position);
            }
        }

        public bool IsTouched { get; set; }
        public float RelativePosition
        {
            get => Position / (MAX_POSITION - MIN_POSITION);
            set => _position = (int) (value * (MAX_POSITION - MIN_POSITION));
        }

        public event EventHandler<int>? PositionChanged;
    }
}