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 MYOBBill = MYOB.AccountRight.SDK.Contracts.Version2.Purchase.ServiceBill;
using MYOBBillLine = MYOB.AccountRight.SDK.Contracts.Version2.Purchase.ServiceBillLine;
using MYOBTaxCode = MYOB.AccountRight.SDK.Contracts.Version2.GeneralLedger.TaxCode;

namespace PRS.Shared.Posters.MYOB;

public class BillMYOBPosterSettings : MYOBPosterSettings
{
    public override string DefaultScript(Type TPostable)
    {
        return @"using MYOBBill = MYOB.AccountRight.SDK.Contracts.Version2.Purchase.ServiceBill;
using MYOBBillLine = MYOB.AccountRight.SDK.Contracts.Version2.Purchase.ServiceBillLine;

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

    public void ProcessBill(IDataModel<Bill> model, Bill bill, MYOBBill myobBill)
    {
        // Do extra processing for a bill; throw an exception to fail this bill.
    }

    public void ProcessBillLine(IDataModel<Bill> model, BillLine billLine, MYOBBillLine myobBillLine)
    {
        // Do extra processing for a bill line; throw an exception to fail this bill line (and thus fail the entire bill)
    }
}";
    }
}

public class BillMYOBPoster : IMYOBPoster<Bill, BillMYOBPosterSettings>
{
    public ScriptDocument? Script { get; set; }

    public MYOBConnectionData ConnectionData { get; set; }

    public BillMYOBPosterSettings Settings { get; set; }

    public MYOBGlobalPosterSettings GlobalSettings { get; set; }

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

        model.SetIsDefault<BillLine>(true, alias: "Bill_BillLine");
        model.SetColumns<BillLine>(RequiredBillLineColumns(), alias: "Bill_BillLine");

        model.SetIsDefault<Supplier>(true, alias: "Bill_Supplier");
        model.SetColumns<Supplier>(RequiredSupplierColumns(), alias: "Bill_Supplier");
        
        Script?.Execute(methodname: "BeforePost", parameters: new object[] { model });

        return true;
    }

    #region Script Functions

    private Result<Exception> ProcessBill(IDataModel<Bill> model, Bill bill, MYOBBill myobBill)
    {
        return this.WrapScript("ProcessBill", model, bill, myobBill);
    }
    private Result<Exception> ProcessBillLine(IDataModel<Bill> model, BillLine billLine, MYOBBillLine myobBillLine)
    {
        return this.WrapScript("ProcessBillLine", model, billLine, myobBillLine);
    }

    #endregion

    private static Columns<Bill> RequiredBillColumns()
    {
        return Columns.None<Bill>()
            .Add(x => x.ID)
            .Add(x => x.Approved)
            .Add(x => x.PostedReference)
            .Add(x => x.Number)
            .Add(x => x.AccountingDate)
            .Add(x => x.SupplierLink.ID)
            .Add(x => x.Description);
    }
    private static Columns<BillLine> RequiredBillLineColumns()
    {
        return Columns.None<BillLine>()
            .Add(x => x.ID)
            .Add(x => x.BillLink.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<Bill> Process(IDataModel<Bill> model)
    {
        // https://developer.myob.com/api/myob-business-api/v2/purchase/bill/bill_service/

        var results = new PostResult<Bill>();

        var service = new ServiceBillService(ConnectionData.Configuration, null, ConnectionData.AuthKey);

        var bills = model.GetTable<Bill>().ToArray<Bill>();
        if(bills.Any(x => x.Approved.IsEmpty()))
        {
            throw new PostFailedMessageException("We can't process unapproved bills; please approve all bills before processing.");
        }

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

        var billLines = model.GetTable<BillLine>("Bill_BillLine")
            .ToObjects<BillLine>().GroupBy(x => x.BillLink.ID).ToDictionary(x => x.Key, x => x.ToArray());
        
        foreach(var bill in bills)
        {
            MYOBBill myobBill;
            Exception? error;
            bool isNew;
            if(Guid.TryParse(bill.PostedReference, out var myobID))
            {
                if(!service.Get(ConnectionData, myobID).Get(out var newBill, out error))
                {
                    CoreUtils.LogException("", error, $"Failed to find Bill in MYOB with id {myobID}");
                    results.AddFailed(bill, $"Failed to find Bill in MYOB with id {myobID}: {error.Message}");
                    continue;
                }
                myobBill = newBill;
                isNew = false;
            }
            else
            {
                myobBill = new MYOBBill();
                isNew = true;
            }

            myobBill.Number = bill.Number.Truncate(13);

            // Probably configure which date.
            myobBill.Date = bill.AccountingDate;
            myobBill.SupplierInvoiceNumber = bill.Number.Truncate(255);

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

            // myobBill.ShipToAddress = 
            // myobBill.Terms = 
            myobBill.IsTaxInclusive = true;
            myobBill.IsReportable = true;
            // myobBill.Freight = 
            // myobBill.FreightForeign = 

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

            // myobBill.Category = 
            myobBill.Comment = bill.Description.Truncate(2000);
            // myobBill.ShippingMethod = 
            // myobBill.PromisedDate = 
            // myobBill.JournalMemo = 
            // myobBill.BillDeliveryStatus = 
            // myobBill.Order = 

            if(billLines.TryGetValue(bill.ID, out var lines))
            {
                var newLines = new MYOBBillLine[lines.Length];
                string? failed = null;
                for(int i = 0; i < lines.Length; ++i)
                {
                    var billLine = lines[i];

                    var line = new MYOBBillLine();
                    line.Type = InvoiceLineType.Transaction;
                    line.Description = billLine.Description.Truncate(1000);

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

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

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

                    newLines[i] = line;
                }

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

            if(!ProcessBill(model, bill, myobBill).Get(out error))
            {
                results.AddFailed(bill, error.Message);
                continue;
            }

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

        return results;
    }
}
public class BillMYOBPosterEngine<T> : MYOBPosterEngine<Bill, BillMYOBPoster, BillMYOBPosterSettings> { }