namespace Common.UI.ViewModels
{
    using Common.Hardware.SIRT;
    using Common.Hardware.SIRT.Tasks;
    using Common.Hardware.WaterMeter.eRegister;
    using Common.Hardware.WaterMeter.eRegister.Features;
    using Common.Hardware.WaterMeter.eRegister.Models;
    using Common.UI.Infrastructure;

    using System;
    using System.Collections.Generic;
    using System.Collections.ObjectModel;
    using System.Linq;
    using System.Net.Http;
    using System.Reflection;
    using System.Threading.Tasks;
    using System.Windows.Input;

    public class ManualProgrammingVM : VM<ManualProgrammingVM>
    {
        public int? Frequency { get; set; } = 433;

        public uint? SerienNr { get; set; } = 22724224;

        public uint? Address { get; set; } = 319017454;

        private bool enabled = true;
        public bool IsEnabled
        {
            get => this.enabled;
            set => this.SetValue(x => x.enabled = value);
        }

        public ICommand SetFactoryState => new Command(this.SetFactoryStateCommand);

        public ObservableCollection<string> ItemsSource { get; set; } = new ObservableCollection<string>();

        private void SetFactoryStateCommand()
        {
            this.InvokeAsync(() => this.IsEnabled = false);

            Task.Factory.StartNew(async () =>
            {
                void WriteToLog(string message) => this.InvokeAsync(() => this.ItemsSource.Add(message));
                
                WriteToLog($"MHz| | {this.Frequency}");
                WriteToLog($"Adr| |esse: {this.Address}");
                WriteToLog($"Ser| |ienNr: {this.SerienNr}");

                var uriFormat = Appsettings.GetSetting("EncryptionKeisUrl");
                var httpClient = new HttpClient();
                var encryptionKey = default(byte[]);

                try
                {
                    using (var httpResponeMessage = await httpClient.GetAsync(string.Format(uriFormat, this.SerienNr)))
                    {
                        var content = await httpResponeMessage.Content.ReadAsStringAsync();

                        if (httpResponeMessage?.IsSuccessStatusCode == true)
                        {
                            var _encryptionKey = content?.Trim('"');
                            encryptionKey = _encryptionKey?.GetEncryptionKey();
                        }
                        else
                        {
                            WriteToLog("Feh| |ler beim Laden des Schlüssels!");
                        }
                    }
                }
                catch (Exception e)
                {
                    WriteToLog(e.Message);

                    return;
                }

                WriteToLog($"Enc| |ryption key: {BitConverter.ToString(encryptionKey)}");

                var task = new EregisterTask(this.Frequency.Value)
                {
                    Timeout = 10_000,
                    WakeUpCmd = true,
                    DelPamSemi = true,
                    WakeUpModul = true,
                    RequestAddress = this.Address.Value,
                    EncryptionKey = encryptionKey,
                    Data = new ChangeFactoryState
                    {
                        FactoryState = FactoryState.Production
                    }
                    .Append(new ProvidePin
                    {
                        AuthLevel = AuthLevel.III
                    })
                };

                void MessageReceived(byte[] bytes) => WriteToLog($"RX:| |{BitConverter.ToString(bytes)}");

                task.MessageReceived += MessageReceived;

                for (var i = 1; i <= 5 && task.State != SIRTTaskState.Completed && task.State != SIRTTaskState.Cancelled; i++)
                {
                    if (AppHost.SIRTHub.Start(task))
                    {
                        WriteToLog($"---| |{i} -------------------------");
                        WriteToLog($"TX:| |{task}");

                        task.Wait();
                    }
                }

                task.MessageReceived -= MessageReceived;

                WriteToLog($"---| |-----------------------------");
                WriteToLog($"ST:| |{task.State}");

                this.InvokeAsync(() => this.IsEnabled = true);
            });
        }
    }

    public class DynamicPropertyVM : VM<DynamicPropertyVM>
    {
        protected readonly Dictionary<string, DynamicPropertyVM> properties;
        protected readonly PropertyInfo propertyInfo;
        protected readonly object instance;
        protected readonly object value;

        public DynamicPropertyVM(object instance, PropertyInfo propertyInfo)
        {
            this.properties = new Dictionary<string, DynamicPropertyVM>();
            this.propertyInfo = propertyInfo;
            this.instance = instance;

            if (this.propertyInfo != null)
            {
                this.Name = this.propertyInfo.Name;
                this.value = Activator.CreateInstance(this.propertyInfo.PropertyType);

                if (this.value is Pam pam)
                {
                    this.Name = $"{pam.CmdHex} - {this.Name}";
                }
            }
        }

        public event Action PropertyValueChanged;

        public string Name { get; }

        private bool selected;
        public bool Selected
        {
            get => this.selected;
            set => this.SetValue(x =>
            {
                x.selected = value;

                var propertyValue = default(object);

                if (x.selected)
                {
                    propertyValue = this.value;
                }

                this.propertyInfo.SetValue(this.instance, propertyValue);
                this.PropertyValueChanged?.Invoke();
            });
        }

        public virtual IEnumerable<DynamicPropertyVM> GetAllProperties() 
            => this.properties
                   .Values
                   .SelectMany(x => x.GetAllProperties())
                   .Union(this.properties.Values)
                   .OrderBy(x => x.Name);
    }

    public class DynamicTypeVM : DynamicPropertyVM
    {
        private readonly Type type;

        public DynamicTypeVM(object instance) : base(instance, null)
        {
            this.type = this.instance.GetType();

            foreach (var propertyInfo in this.type.GetProperties(BindingFlags.Instance | BindingFlags.Public))
            {
                var pamAttribute = propertyInfo.GetCustomAttribute<PamAttribute>();

                if (pamAttribute is null)
                {
                    continue;
                }

                var dynamicProperty = new DynamicPropertyVM(this.instance, propertyInfo);

                if (propertyInfo.PropertyType == typeof(EregisterDebugFeatures))
                {
                    var propertyInstance = new EregisterDebugFeatures();

                    propertyInfo.SetValue(this.instance, propertyInstance);

                    dynamicProperty = new DynamicTypeVM(propertyInstance);
                }
                
                this.properties[propertyInfo.Name] = dynamicProperty;
            }
        }
    }
}