using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using log4net;
using NHibernate;
using SharedDatabase.Entities;

namespace Workplace.CheckItems
{
    public partial class SNGeneratorPrinter : UserControl, ICheckItem
    {
        static readonly ILog log = LogManager.GetLogger(typeof(SNGeneratorPrinter));

        public const int FirstAssignedBaseSN = 200100000;
        public const int NrGeneratorIx = 0;


        public override string ToString()
        {
            return string.Format("S/N-generator: {0} {1}", IxPolozky, Part.Name);
        }

        WorkplaceDlg parent;

        public Part Part { get; set; }
        public int IxPolozky { get; set; }
        public IList<string> BlackListedCodes { get; set; }


		SNGeneratorPrinter()
		{
			InitializeComponent();
            BlackListedCodes = new List<string>();
            lastAuftrag = null;
            ResetOrderInfoEtc();
        }

        public SNGeneratorPrinter(WorkplaceDlg parent, SharedDatabase.Entities.Part part)
			: this()
		{
			this.parent = parent;
            this.Part = part;
			kodMaterialuLabel.Text = part.Name;
			descriptionMaterialuLabel.Text = part.Description;
		}

        public string ScannedCode
        {
            get { return scannedCodeTextBox.Text; }
            set { scannedCodeTextBox.Text = value; }
        }

        public void ClearCode()
        {
            try
            {
                var session = parent.SessionFactory.OpenSession();
                string nextCode;
                NegotiateSerialNr(session, parent.CurrentOrder, parent.CurrentWorkflow, parent.CurrentWorkstep, out nextCode);
                scannedCodeTextBox.Text = nextCode;
                session.Close();
            }
            catch (Exception exc)
            {
                log.ErrorFormat("Failed to negotiate s/n in ClearCode() : {0}", exc.Message);
            }
        }

        public void SubmitCode(string code)
        {
            scannedCodeTextBox.Text = code;
            scannedCodeTextBox_KeyPress(null, new KeyPressEventArgs('\r'));
        }

		public void ResetFocus()
		{
			setFocusButton.Text = "";
		}

		public void SetFocus()
		{
			setFocusButton.Text = ">";
			scannedCodeTextBox.Focus();
		}

		private void setFocusButton_Click(object sender, EventArgs e)
		{
			setFocusButton.Text = ">";
			parent.OnFocusPressed(this, new FocusPressedEventArgs(IxPolozky, Part.CodeLocation));
		}

		private void scannedCodeTextBox_KeyPress(object sender, KeyPressEventArgs e)
		{
            if (e.KeyChar != '\r') return;

            parent.OnBarcodeReceived(this, new BarcodeReceivedEventArgs(ScannedCode, IxPolozky, Part.CodeLocation));
			return;
		}




        ///
        /// Unique serial code generation and printing as data matrices
        ///
        public OrderProgress OrderInfoState;

        Auftrag lastAuftrag;
        ///
        OrderInfo orderInfo;
        bool thisIsThe1stWorkplace;
        bool thisIsThe2ndWorkplace;
        bool thisIsThe3rdWorkplace;
        ///
        void ResetOrderInfoEtc()
        {
            orderInfo = null;
            thisIsThe1stWorkplace = false;
            thisIsThe2ndWorkplace = false;
            thisIsThe3rdWorkplace = false;
        }

        /// <summary>
        /// Negotiate the serial number and the next candidate serial number.
        /// </summary>
        /// <param name="session">MySQL database session</param>
        /// <param name="auftrag">Order info from VT_AUFTRAG_PD from Oracle database</param>
        /// <param name="workflow">Production tracing workflow</param>
        /// <param name="workstep">Production tracing workstep</param>
        /// <param name="currentSN">Negotiated S/N (in most cases it is the candidate S/N)</param>
        /// <param name="nextSN">Next candidate S/N</param>
        /// <param name="candidateSN">Candidate S/N, if -1 the negotiated S/N will not be marked as saved</param>
        /// <returns>NoOrderInfoYet, OrderInProgress or OrderCompleted</returns>
        public OrderProgress NegotiateSerialNr(ISession session, OrderInfo order, Process workflow, Workstep workstep, out string nextCode,
                                               bool commitOrderInfoChanges = false)
        {
            nextCode = "ERROR";
            if (order == null) return OrderProgress.Error;

            OrderProgress retv = OrderProgress.Error;
            try
            {
                OrderInfo updatedOrder;             /// Order to be used when negotiating
                if (commitOrderInfoChanges)
                {
                    IList<OrderInfo> list = session.QueryOver<OrderInfo>()
                                                   .Where(x => x.Id == order.Id)
                                                   .List();
                    if (list.Count != 1)
                    {
                        log.ErrorFormat("Order {0} wasn't found in the database", order.POName);
                        return OrderProgress.Error;
                    }

                    updatedOrder = list[0];
                }
                else
                {
                    updatedOrder = order;
                }

                string generatedSNFormat = Part.Name + "7VQ{0:D9}";

                int baseNr, currentNr;
                switch (NrGeneratorIx)
                {
                    default:
                    case 0: baseNr = updatedOrder.BaseNr1; currentNr = updatedOrder.CurrentNr1; break;
                    case 1: baseNr = updatedOrder.BaseNr2; currentNr = updatedOrder.CurrentNr2; break;
                    case 2: baseNr = updatedOrder.BaseNr3; currentNr = updatedOrder.CurrentNr3; break;
                    case 3: baseNr = updatedOrder.BaseNr4; currentNr = updatedOrder.CurrentNr4; break;
                    case 4: baseNr = updatedOrder.BaseNr5; currentNr = updatedOrder.CurrentNr5; break;
                }

                if (baseNr == 0 || currentNr < baseNr)
                {
                    if (baseNr == 0)
                    {
                        /// There are no pieces saved for this order,  determine BaseNr1
                        baseNr = parent.GetNextBaseNr(parent.AllOrders, NrGeneratorIx);
                    }

                    currentNr = baseNr;
                    nextCode = string.Format(generatedSNFormat, currentNr);
                    retv = commitOrderInfoChanges ? OrderProgress.InProgress : OrderProgress.NotStarted;
                }
                else if (currentNr < baseNr + updatedOrder.PiecesCount - 1)
                {
                    currentNr++;
                    nextCode = string.Format(generatedSNFormat, currentNr);
                    retv = OrderProgress.InProgress;
                }
                else if (currentNr < baseNr + updatedOrder.PiecesCount + Cnst.ExtraPieces - 1)
                {
                    currentNr++;
                    nextCode = string.Format(generatedSNFormat, currentNr);
                    retv = OrderProgress.Overproduction;
                }
                else
                {
                    nextCode = "END";
                    retv = OrderProgress.Completed;
                }

                if (commitOrderInfoChanges)
                {
                    switch (NrGeneratorIx)
                    {
                        default:
                        case 0: updatedOrder.BaseNr1 = baseNr; updatedOrder.CurrentNr1 = currentNr; break;
                        case 1: updatedOrder.BaseNr2 = baseNr; updatedOrder.CurrentNr2 = currentNr; break;
                        case 2: updatedOrder.BaseNr3 = baseNr; updatedOrder.CurrentNr3 = currentNr; break;
                        case 3: updatedOrder.BaseNr4 = baseNr; updatedOrder.CurrentNr4 = currentNr; break;
                        case 4: updatedOrder.BaseNr5 = baseNr; updatedOrder.CurrentNr5 = currentNr; break;
                    }

                    session.SaveOrUpdate(updatedOrder);
                    updatedOrder.CopyContentTo(order);
                }
            }
            catch (Exception exc)
            {
                log.ErrorFormat("Error reading or updating order {0}: {1}", order.POName, exc.Message);
                if (exc.InnerException != null) log.ErrorFormat("Inner exception: {0}", exc.InnerException.Message);
                return OrderProgress.Error;
            }

            return retv;
        }
    }
}