// ReSharper disable MemberCanBePrivate.Global
// ReSharper disable UnusedMember.Global

using System;
using System.Collections.Generic;
using System.Linq;
using RGB.NET.Core;
using Sanford.Multimedia.Midi;

namespace RGB.NET.Devices.Novation
{
    /// <inheritdoc />
    /// <summary>
    /// Represents a device provider responsible for Novation  devices.
    /// </summary>
    public class NovationDeviceProvider : AbstractRGBDeviceProvider
    {
        #region Properties & Fields

        private static NovationDeviceProvider? _instance;
        /// <summary>
        /// Gets the singleton <see cref="NovationDeviceProvider"/> instance.
        /// </summary>
        public static NovationDeviceProvider Instance => _instance ?? new NovationDeviceProvider();

        #endregion

        #region Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="NovationDeviceProvider"/> class.
        /// </summary>
        /// <exception cref="InvalidOperationException">Thrown if this constructor is called even if there is already an instance of this class.</exception>
        private NovationDeviceProvider()
        {
            if (_instance != null) throw new InvalidOperationException($"There can be only one instance of type {nameof(NovationDeviceProvider)}");
            _instance = this;
        }

        #endregion

        #region Methods

        protected override void InitializeSDK() { }

        protected override IEnumerable<IRGBDevice> LoadDevices()
        {
            for (int index = 0; index < OutputDeviceBase.DeviceCount; index++)
            {
                MidiOutCaps outCaps = OutputDeviceBase.GetDeviceCapabilities(index);
                if (outCaps.name == null) continue;

                NovationDevices? deviceId = (NovationDevices?)Enum.GetValues(typeof(NovationDevices))
                                                                  .Cast<Enum>()
                                                                  .FirstOrDefault(x => x.GetDeviceId()?.ToUpperInvariant().Contains(outCaps.name.ToUpperInvariant()) ?? false);

                if (deviceId == null) continue;

                NovationColorCapabilities colorCapability = deviceId.GetColorCapability();
                if (colorCapability == NovationColorCapabilities.None) continue;

                yield return new NovationLaunchpadRGBDevice(new NovationLaunchpadRGBDeviceInfo(outCaps.name, index, colorCapability, deviceId.GetLedIdMapping()), GetUpdateTrigger());
            }
        }

        #endregion
    }
}