using Comal.Classes;
using InABox.Core;
using InABox.Core.Postable;
using InABox.Poster.MYOB;
using InABox.Scripting;
using MYOB.AccountRight.SDK.Contracts.Version2.Sale;
using MYOB.AccountRight.SDK.Services.GeneralLedger;
using MYOB.AccountRight.SDK.Services.Purchase;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MYOBPurchaseOrder = MYOB.AccountRight.SDK.Contracts.Version2.Purchase.ServicePurchaseOrder;
using MYOBPurchaseOrderItem = MYOB.AccountRight.SDK.Contracts.Version2.Purchase.ServicePurchaseOrderLine;
using MYOBTaxCode = MYOB.AccountRight.SDK.Contracts.Version2.GeneralLedger.TaxCode;

namespace PRS.Shared.Posters.MYOB;

public class PurchaseOrderMYOBPosterSettings : MYOBPosterSettings
{
    public override string DefaultScript(Type TPostable)
    {
        return @"using MYOBPurchaseOrder = MYOB.AccountRight.SDK.Contracts.Version2.Purchase.ServicePurchaseOrder;
using MYOBPurchaseOrderItem = MYOB.AccountRight.SDK.Contracts.Version2.Purchase.ServicePurchaseOrderLine;

public class Module
{
    public void BeforePost(IDataModel<PurchaseOrder> model)
    {
        // Perform pre-processing
    }

    public void ProcessPurchaseOrder(IDataModel<PurchaseOrder> model, PurchaseOrder purchaseOrder, MYOBPurchaseOrder myobPurchaseOrder)
    {
        // Do extra processing for a purchase order; throw an exception to fail this purchase order.
    }

    public void ProcessPurchaseOrderItem(IDataModel<PurchaseOrder> model, PurchaseOrderItem purchaseOrderItem, MYOBPurchaseOrderItem myobPurchaseOrderItem)
    {
        // Do extra processing for a purchase order item; throw an exception to fail this purchase order item (and thus fail the entire purchase order)
    }
}";
    }
}

public class PurchaseOrderMYOBPoster : IMYOBPoster<PurchaseOrder, PurchaseOrderMYOBPosterSettings>
{
    public ScriptDocument? Script { get; set; }
    public MYOBConnectionData ConnectionData { get; set; }
    public PurchaseOrderMYOBPosterSettings Settings { get; set; }
    public MYOBGlobalPosterSettings GlobalSettings { get; set; }

    public bool BeforePost(IDataModel<PurchaseOrder> model)
    {
        foreach (var (_, table) in model.ModelTables)
        {
            table.IsDefault = false;
        }
        model.SetIsDefault<PurchaseOrder>(true);
        model.SetColumns<PurchaseOrder>(RequiredPurchaseOrderColumns());

        model.SetIsDefault<PurchaseOrderItem>(true, alias: "PurchaseOrder_PurchaseOrderItem");
        model.SetColumns<PurchaseOrderItem>(RequiredPurchaseOrderItemColumns(), alias: "PurchaseOrder_PurchaseOrderItem");

        model.SetIsDefault<Supplier>(true, alias: "PurchaseOrder_Supplier");
        model.SetColumns<Supplier>(RequiredSupplierColumns(), alias: "PurchaseOrder_Supplier");

        Script?.Execute(methodname: "BeforePost", parameters: new object[] { model });

        return true;
    }

    #region Script Functions

    private Result<Exception> ProcessPurchaseOrder(IDataModel<PurchaseOrder> model, PurchaseOrder po, MYOBPurchaseOrder myobPO)
    {
        return this.WrapScript("ProcessPurchaseOrder", model, po, myobPO);
    }
    private Result<Exception> ProcessPurchaseOrderItem(IDataModel<PurchaseOrder> model, PurchaseOrderItem poItem, MYOBPurchaseOrderItem myobPOItem)
    {
        return this.WrapScript("ProcessPurchaseOrderItem", model, poItem, myobPOItem);
    }

    #endregion

    private static Columns<PurchaseOrder> RequiredPurchaseOrderColumns()
    {
        return Columns.None<PurchaseOrder>()
            .Add(x => x.ID)
            .Add(x => x.PostedReference)
            .Add(x => x.IssuedDate)
            .Add(x => x.PONumber)
            .Add(x => x.SupplierLink.ID)
            .Add(x => x.Description);
    }
    private static Columns<PurchaseOrderItem> RequiredPurchaseOrderItemColumns()
    {
        return Columns.None<PurchaseOrderItem>()
            .Add(x => x.ID)
            .Add(x => x.PurchaseOrderLink.ID)
            .Add(x => x.Description)
            .Add(x => x.IncTax)
            .Add(x => x.PurchaseGL.ID)
            .Add(x => x.PurchaseGL.Code)
            .Add(x => x.PurchaseGL.PostedReference)
            .Add(x => x.TaxCode.ID)
            .Add(x => x.TaxCode.Code)
            .Add(x => x.TaxCode.PostedReference);
    }
    private static Columns<Supplier> RequiredSupplierColumns()
    {
        return SupplierMYOBPoster.RequiredColumns();
    }

    public IPostResult<PurchaseOrder> Process(IDataModel<PurchaseOrder> model)
    {
        var results = new PostResult<PurchaseOrder>();
        var service = new ServicePurchaseOrderService(ConnectionData.Configuration, null, ConnectionData.AuthKey);

        var pos = model.GetTable<PurchaseOrder>().ToArray<PurchaseOrder>();
        if(pos.Any(x => x.IssuedDate.IsEmpty()))
        {
            throw new PostFailedMessageException($"We can't process unissued purchase orders; please set [{nameof(PurchaseOrder.IssuedDate)}] for" +
                $" all purchase orders before processing.");
        }

        var poItems = model.GetTable<PurchaseOrderItem>("PurchaseOrder_PurchaseOrderItem")
            .ToObjects<PurchaseOrderItem>().GroupBy(x => x.PurchaseOrderLink.ID).ToDictionary(x => x.Key, x => x.ToArray());

        var suppliers = model.GetTable<Supplier>("PurchaseOrder_Supplier")
            .ToObjects<Supplier>().ToDictionary(x => x.ID);

        foreach(var po in pos)
        {
            MYOBPurchaseOrder myobPO;
            Exception? error;
            bool isNew;
            if(Guid.TryParse(po.PostedReference, out var myobID))
            {
                if(!service.Get(ConnectionData, myobID).Get(out var newPO, out error))
                {
                    CoreUtils.LogException("", error, $"Failed to find Purchase Order in MYOB with id {myobID}");
                    results.AddFailed(po, $"Failed to find Purchase Order in MYOB with id {myobID}: {error.Message}");
                    continue;
                }
                myobPO = newPO;
                isNew = false;
            }
            else
            {
                myobPO = new MYOBPurchaseOrder();
                isNew = true;
            }

            myobPO.Number = po.PONumber.Truncate(13);
            myobPO.Date = po.IssuedDate;
            // myobPO.SupplierInvoiceNumber

            if(suppliers.TryGetValue(po.SupplierLink.ID, out var supplier))
            {
                if(!SupplierMYOBPoster.MapSupplier(ConnectionData, supplier, GlobalSettings).Get(out var supplierID, out error))
                {
                    CoreUtils.LogException("", error, $"Error while posting purchase order {po.ID}");
                    results.AddFailed(po, error.Message);
                    continue;
                }
                myobPO.Supplier ??= new();
                myobPO.Supplier.UID = supplierID;
                results.AddFragment(supplier, supplier.PostedStatus);
            }

            // myobPO.ShipToAddress = 
            // myobPO.Terms = 
            myobPO.IsTaxInclusive = true;
            myobPO.IsReportable = true;

            // myobPO.Freight = 
            // myobPO.FreightForeign = 

            if (isNew)
            {
                if(!this.GetDefaultTaxCode().Get(out var taxCodeID, out error))
                {
                    results.AddFailed(po, error.Message);
                    continue;
                }
                myobPO.FreightTaxCode ??= new();
                myobPO.FreightTaxCode.UID = taxCodeID;
            }

            // myobPO.Category = 
            myobPO.Comment = po.Description.Truncate(2000);
            // myobPO.ShippingMethod = 
            // myobPO.PromisedDate = 
            // myobPO.JournalMemo = 
            // myobPO.OrderDeliveryStatus = 

            if(poItems.TryGetValue(po.ID, out var lines))
            {
                var newLines = new MYOBPurchaseOrderItem[lines.Length];
                string? failed = null;
                for(int i = 0; i < lines.Length; ++i)
                {
                    var poItem = lines[i];

                    var line = new MYOBPurchaseOrderItem();
                    line.Type = OrderLineType.Transaction;
                    line.Description = poItem.Description.Truncate(1000);

                    if(poItem.PurchaseGL.ID == Guid.Empty)
                    {
                        failed = "Not all lines have a PurchaseGL code set.";
                        break;
                    }
                    if(!Guid.TryParse(poItem.PurchaseGL.PostedReference, out var accountID))
                    {
                        if(AccountMYOBUtils.GetAccount(ConnectionData, poItem.PurchaseGL.Code).Get(out accountID, out error))
                        {
                            results.AddFragment(new GLCode { PostedReference = accountID.ToString() }.SetID(poItem.PurchaseGL.ID));
                        }
                        else
                        {
                            CoreUtils.LogException("", error);
                            failed = error.Message;
                            break;
                        }
                    }
                    line.Account ??= new();
                    line.Account.UID = accountID;
                    line.Total = Math.Round(Convert.ToDecimal(poItem.IncTax), 2);
                    line.TotalForeign = 0;
                    // line.UnitsOfMeasure =
                    // line.UnitCount =
                    // line.UnitPrice =
                    // line.UnitPriceForeign =
                    // line.DiscountPercent =
                    // line.Job =

                    if(poItem.TaxCode.ID == Guid.Empty)
                    {
                        failed = "Not all lines have a TaxCode set.";
                        break;
                    }
                    if(!Guid.TryParse(poItem.TaxCode.PostedReference, out var taxCodeID))
                    {
                        if (!ConnectionData.GetUID<TaxCodeService, MYOBTaxCode>(
                                new Filter<MYOBTaxCode>(x => x.Code).IsEqualTo(poItem.TaxCode.Code))
                            .Get(out taxCodeID, out error))
                        {
                            CoreUtils.LogException("", error, $"Failed to find TaxCode in MYOB with code {poItem.TaxCode.Code}");
                            failed = $"Failed to find TaxCode in MYOB with code {poItem.TaxCode.Code}: {error.Message}";
                            break;
                        }
                        else if (taxCodeID == Guid.Empty)
                        {
                            failed = $"Failed to find TaxCode in MYOB with code {poItem.TaxCode.Code}";
                            break;
                        }
                        results.AddFragment(new TaxCode { PostedReference = taxCodeID.ToString() }.SetID(taxCodeID));
                    }
                    line.TaxCode ??= new();
                    line.TaxCode.UID = taxCodeID;

                    if(!ProcessPurchaseOrderItem(model, poItem, line).Get(out error))
                    {
                        failed = error.Message;
                        break;
                    }

                    newLines[i] = line;
                }

                if(failed is not null)
                {
                    results.AddFailed(po, failed);
                    continue;
                }
                myobPO.Lines = newLines;
            }
            else
            {
                myobPO.Lines = [];
            }

            if(!ProcessPurchaseOrder(model, po, myobPO).Get(out error))
            {
                results.AddFailed(po, error.Message);
                continue;
            }

            if(service.Save(ConnectionData, myobPO).Get(out var result, out error))
            {
                po.PostedReference = result.UID.ToString();
                results.AddSuccess(po);
            }
            else
            {
                CoreUtils.LogException("", error, $"Error while posting purchase order {po.ID}");
                results.AddFailed(po, error.Message);
            }
        }

        return results;
    }
}

public class PurchaseOrderMYOBPosterEngine : MYOBPosterEngine<PurchaseOrder, PurchaseOrderMYOBPoster, PurchaseOrderMYOBPosterSettings>
{
}