using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core;
using Tango.Integration.Storage;

namespace Tango.Integration.Upgrade
{
    public class FirmwareUpgradeHandler : ExtendedObject
    {
        private Action _cancelAction;

        public event EventHandler<FirmwareUpgradeProgressEventArgs> Progress;
        public event EventHandler Completed;
        public event EventHandler Canceled;
        public event EventHandler<Exception> Failed;

        internal FirmwareUpgradeHandler()
        {
            IsIndeterminate = true;
            Total = 100;
            Message = "Initializing...";
        }

        internal FirmwareUpgradeHandler(Action cancelAction) : this()
        {
            _cancelAction = cancelAction;
        }

        private String _message;
        public String Message
        {
            get { return _message; }
            set { _message = value; RaisePropertyChangedAuto(); }
        }

        private FirmwareUpgradeStatus _status;
        public FirmwareUpgradeStatus Status
        {
            get { return _status; }
            private set { _status = value; RaisePropertyChangedAuto(); }
        }

        private double _current;
        public double Current
        {
            get { return _current; }
            internal set
            {
                _current = value; RaisePropertyChangedAuto();
            }
        }

        private double _total;
        public double Total
        {
            get { return _total; }
            internal set { _total = value; RaisePropertyChangedAuto(); }
        }

        private bool _isIndeterminate;
        public bool IsIndeterminate
        {
            get { return _isIndeterminate; }
            set { _isIndeterminate = value; RaisePropertyChangedAuto(); }
        }

        public Task Cancel()
        {
            return Task.Factory.StartNew(() =>
            {
                _cancelAction.Invoke();
                Message = "Canceled.";
                Status = FirmwareUpgradeStatus.Canceled;
                Canceled?.Invoke(this, new EventArgs());
            });
        }

        internal void RaiseCompleted()
        {
            RaiseProgress(FirmwareUpgradeStatus.Completed, "Firmware upgrade completed.", false, 100, 100);
            Completed?.Invoke(this, new EventArgs());
        }

        internal void RaiseCanceled()
        {
            RaiseProgress(FirmwareUpgradeStatus.Canceled, "Firmware upgrade canceled by user.", false, 100, 0);
            Canceled?.Invoke(this, new EventArgs());
        }

        internal void RaiseFailed(Exception ex)
        {
            RaiseProgress(FirmwareUpgradeStatus.Failed, "Firmware upgrade failed.", false, 100, 0);
            Failed?.Invoke(this, ex);
        }

        internal void RaiseProgress(FirmwareUpgradeStatus status, String message, bool isIndeterminate = true, double total = 100, double current = 0)
        {
            Total = total;
            Current = current;
            IsIndeterminate = isIndeterminate;
            Status = status;
            Message = message;

            Progress?.Invoke(this, new FirmwareUpgradeProgressEventArgs()
            {
                Current = Current,
                Status = Status,
                Total = Total,
                Message = Message,
                IsIndeterminate = IsIndeterminate
            });
        }
    }
}