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

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Globalization;
using RGB.NET.Core;
using RGB.NET.Devices.Msi.Exceptions;
using RGB.NET.Devices.Msi.Native;

namespace RGB.NET.Devices.Msi
{
    /// <inheritdoc />
    /// <summary>
    /// Represents a device provider responsible for Cooler Master devices.
    /// </summary>
    public class MsiDeviceProvider : IRGBDeviceProvider
    {
        #region Properties & Fields

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

        /// <summary>
        /// Gets a modifiable list of paths used to find the native SDK-dlls for x86 applications.
        /// The first match will be used.
        /// </summary>
        public static List<string> PossibleX86NativePaths { get; } = new List<string> { "x86/MysticLight_SDK.dll" };

        /// <summary>
        /// Gets a modifiable list of paths used to find the native SDK-dlls for x64 applications.
        /// The first match will be used.
        /// </summary>
        public static List<string> PossibleX64NativePaths { get; } = new List<string> { "x64/MysticLight_SDK.dll" };

        /// <inheritdoc />
        /// <summary>
        /// Indicates if the SDK is initialized and ready to use.
        /// </summary>
        public bool IsInitialized { get; private set; }

        /// <summary>
        /// Gets the loaded architecture (x64/x86).
        /// </summary>
        public string LoadedArchitecture => _MsiSDK.LoadedArchitecture;

        /// <inheritdoc />
        /// <summary>
        /// Gets whether the application has exclusive access to the SDK or not.
        /// </summary>
        public bool HasExclusiveAccess { get; private set; }

        /// <inheritdoc />
        public IEnumerable<IRGBDevice> Devices { get; private set; }

        /// <summary>
        /// Gets or sets a function to get the culture for a specific device.
        /// </summary>
        public Func<CultureInfo> GetCulture { get; set; } = CultureHelper.GetCurrentCulture;

        #endregion

        #region Constructors

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

        #endregion

        #region Methods

        /// <inheritdoc />
        public bool Initialize(RGBDeviceType loadFilter = RGBDeviceType.All, bool exclusiveAccessIfPossible = false, bool throwExceptions = false)
        {
            IsInitialized = false;

            try
            {
                _MsiSDK.Reload();

                IList<IRGBDevice> devices = new List<IRGBDevice>();

                int errorCode;
                if ((errorCode = _MsiSDK.Initialize()) != 0)
                    ThrowMsiError(errorCode);

                if ((errorCode = _MsiSDK.GetDeviceInfo(out string[] deviceTypes, out int[] ledCounts)) != 0)
                    ThrowMsiError(errorCode);

                for (int i = 0; i < deviceTypes.Length; i++)
                {
                    try
                    {
                        //TODO DarthAffe 11.11.2017: What is this deviceType? Find someone to try that out
                    }
                    catch { if (throwExceptions) throw; }
                }

                Devices = new ReadOnlyCollection<IRGBDevice>(devices);
                IsInitialized = true;
            }
            catch
            {
                if (throwExceptions)
                    throw;
                return false;
            }

            return true;
        }

        private void ThrowMsiError(int errorCode) => throw new MysticLightException(errorCode, _MsiSDK.GetErrorMessage(errorCode));

        /// <inheritdoc />
        public void ResetDevices()
        {
            //TODO DarthAffe 11.11.2017: Implement
        }

        #endregion
    }
}