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.Sale;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Markup.Localizer;
using Invoice = Comal.Classes.Invoice;
using MYOBReceipt = MYOB.AccountRight.SDK.Contracts.Version2.Sale.CustomerPayment;
using MYOBInvoiceReceipt = MYOB.AccountRight.SDK.Contracts.Version2.Sale.CustomerPaymentLine;

namespace PRS.Shared.Posters.MYOB;

public class ReceiptMYOBPosterSettings : MYOBPosterSettings
{
    [EditorSequence(1)]
    [TextBoxEditor(ToolTip = "The MYOB account code for receipts")]
    public string Account { get; set; }

    public override string DefaultScript(Type TPostable)
    {
        return @"using MYOBReceipt = MYOB.AccountRight.SDK.Contracts.Version2.Sale.CustomerPayment;
using MYOBInvoiceReceipt = MYOB.AccountRight.SDK.Contracts.Version2.Sale.CustomerPaymentLine;

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

    public void ProcessReceipt(IDataModel<Receipt> model, Receipt receipt, MYOBReceipt myobReceipt)
    {
        // Do extra processing for a receipt; throw an exception to fail this receipt.
    }

    public void ProcessInvoiceReceipt(IDataModel<Receipt> model, InvoiceReceipt invoiceReceipt, MYOBInvoiceReceipt myobInvoiceReceipt)
    {
        // Do extra processing for an invoice receipt; throw an exception to fail this invoice receipt (and thus fail the entire receipt)
    }
}";
    }
}

public class ReceiptMYOBPoster : IMYOBPoster<Receipt, ReceiptMYOBPosterSettings>
{
    public ScriptDocument? Script { get; set; }
    public MYOBConnectionData ConnectionData { get; set; }
    public ReceiptMYOBPosterSettings Settings { get; set; }
    public MYOBGlobalPosterSettings GlobalSettings { get; set; }

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

        model.SetIsDefault<InvoiceReceipt>(true, alias: "Receipt_InvoiceReceipt");
        model.SetColumns<InvoiceReceipt>(RequiredInvoiceReceiptColumns(), alias: "Receipt_InvoiceReceipt");

        model.SetIsDefault<Customer>(true, alias: "Receipt_Customer");
        model.SetColumns<Customer>(RequiredCustomerColumns(), alias: "Receipt_Customer");

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

        return true;
    }

    #region Script Functions

    private Result<Exception> ProcessReceipt(IDataModel<Receipt> model, Receipt receipt, MYOBReceipt myobReceipt)
    {
        return this.WrapScript("ProcessReceipt", model, receipt, myobReceipt);
    }
    private Result<Exception> ProcessInvoiceReceipt(IDataModel<Receipt> model, InvoiceReceipt invoiceReceipt, MYOBInvoiceReceipt myobInvoiceReceipt)
    {
        return this.WrapScript("ProcessInvoiceReceipt", model, invoiceReceipt, myobInvoiceReceipt);
    }

    #endregion

    private static Columns<Receipt> RequiredReceiptColumns()
    {
        return Columns.None<Receipt>()
            .Add(x => x.ID)
            .Add(x => x.PostedReference)
            .Add(x => x.PostedStatus)
            .Add(x => x.CustomerLink.ID)
            .Add(x => x.Date)
            .Add(x => x.Total)
            .Add(x => x.Notes);
    }

    private static Columns<InvoiceReceipt> RequiredInvoiceReceiptColumns()
    {
        return Columns.None<InvoiceReceipt>()
            .Add(x => x.ID)
            .Add(x => x.Amount)
            .Add(x => x.ReceiptLink.ID)
            .Add(x => x.InvoiceLink.Number)
            .Add(x => x.InvoiceLink.PostedReference);
    }

    private static Columns<Customer> RequiredCustomerColumns()
    {
        return CustomerMYOBPoster.RequiredColumns();
    }

    public IPostResult<Receipt> Process(IDataModel<Receipt> model)
    {
        // https://developer.myob.com/api/myob-business-api/v2/sale/customerpayment/

        var results = new PostResult<Receipt>();

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

        var receipts = model.GetTable<Receipt>().ToArray<Receipt>();

        var customers = model.GetTable<Customer>("Receipt_Customer")
            .ToObjects<Customer>().ToDictionary(x => x.ID);

        var invoices = model.GetTable<InvoiceReceipt>("Receipt_InvoiceReceipt")
            .ToObjects<InvoiceReceipt>().GroupBy(x => x.ReceiptLink.ID).ToDictionary(x => x.Key, x => x.ToArray());
        
        foreach(var receipt in receipts)
        {
            // For receipts, always create a new one, so we cannot posted already posted stuff.
            if(receipt.PostedStatus == PostedStatus.Posted)
            {
                continue;
            }

            var myobReceipt = new MYOBReceipt();

            myobReceipt.DepositTo = DepositTo.Account;

            // Setting this to null right now.
            myobReceipt.Account ??= new();

            if (Settings.Account.IsNullOrWhiteSpace())
            {
                throw new MissingSettingException<ReceiptMYOBPosterSettings>(x => x.Account);
            }
            else if(AccountMYOBUtils.GetAccount(ConnectionData, Settings.Account).Get(out var accountID, out var error))
            {
                myobReceipt.Account.UID = accountID;
            }
            else
            {
                CoreUtils.LogException("", error);
                results.AddFailed(receipt, error.Message);
                continue;
            }

            if(customers.TryGetValue(receipt.CustomerLink.ID, out var customer))
            {
                if(!CustomerMYOBPoster.MapCustomer(ConnectionData, customer, GlobalSettings).Get(out var customerID, out var error))
                {
                    CoreUtils.LogException("", error, $"Error while posting receipt {receipt.ID}");
                    results.AddFailed(receipt, error.Message);
                    continue;
                }
                myobReceipt.Customer ??= new();
                myobReceipt.Customer.UID = customerID;
                results.AddFragment(customer, customer.PostedStatus);
            }

            // myobReceipt.ReceiptNumber = 
            myobReceipt.Date = receipt.Date;
            myobReceipt.AmountReceived = (decimal)receipt.Total;
            // myobReceipt.AmountReceivedForeign = 0;
            // myobReceipt.PaymentMethod =
            myobReceipt.Memo = receipt.Notes.Truncate(255);

            if(invoices.TryGetValue(receipt.ID, out var receiptInvoices))
            {
                var myobInvoices = new CustomerPaymentLine[receiptInvoices.Length];
                string? failed = null;
                for(int i = 0; i < receiptInvoices.Length; ++i)
                {
                    var invoice = receiptInvoices[i];

                    var line = new CustomerPaymentLine();
                    // line.RowID = i + 1;
                    line.Number = invoice.InvoiceLink.Number.ToString().Truncate(8);
                    line.AmountApplied = (decimal)invoice.Amount;
                    line.Type = CustomerPaymentLineType.Invoice;

                    if(Guid.TryParse(invoice.InvoiceLink.PostedReference, out var myobInvoiceID))
                    {
                        line.UID = myobInvoiceID;
                    }
                    else
                    {
                        failed = $"Invoice {invoice.InvoiceLink.Number} hasn't been posted yet; it must be posted before this receipt can be.";
                        break;
                    }

                    if(!ProcessInvoiceReceipt(model, invoice, line).Get(out var error))
                    {
                        failed = error.Message;
                        break;
                    }

                    myobInvoices[i] = line;
                }

                if(failed is not null)
                {
                    results.AddFailed(receipt, failed);
                    continue;
                }
                myobReceipt.Invoices = myobInvoices;
            }
            else
            {
                myobReceipt.Invoices = [];
            }

            if(!ProcessReceipt(model, receipt, myobReceipt).Get(out var e))
            {
                results.AddFailed(receipt, e.Message);
                continue;
            }

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

        return results;
    }
}

public class ReceiptMYOBPosterEngine<T> : MYOBPosterEngine<Receipt, ReceiptMYOBPosterSettings> { }