using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.Core.Postable;
using InABox.Database;
using InABox.Poster.MYOB;
using InABox.Scripting;
using MYOB.AccountRight.SDK.Services.Contact;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MYOBSupplier = MYOB.AccountRight.SDK.Contracts.Version2.Contact.Supplier;

namespace PRS.Shared.Posters.MYOB;

public class SupplierMYOBPosterSettings : MYOBPosterSettings
{
    public override string DefaultScript(Type TPostable)
    {
        return @"using MYOBSupplier = MYOB.AccountRight.SDK.Contracts.Version2.Contact.Supplier;

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

    public void ProcessSupplier(IDataModel<Supplier> model, Supplier supplier, MYOBSupplier myobSupplier)
    {
        // Do extra processing for a supplier; throw an exception to fail this supplier.
    }
}";
    }
}

public class SupplierMYOBAutoRefresher : IAutoRefresher<Supplier>
{
    public bool ShouldRepost(Supplier supplier)
    {
        var shouldRepost = supplier.HasOriginalValue(x => x.Name)
            || supplier.HasOriginalValue(x => x.Code)
            || supplier.HasOriginalValue(x => x.ABN)
            || supplier.HasOriginalValue(x => x.Email)
            || supplier.HasOriginalValue(x => x.Telephone)
            || supplier.Delivery.HasOriginalValue(x => x.Street)
            || supplier.Delivery.HasOriginalValue(x => x.City)
            || supplier.Delivery.HasOriginalValue(x => x.State)
            || supplier.Delivery.HasOriginalValue(x => x.PostCode)
            || supplier.Postal.HasOriginalValue(x => x.Street)
            || supplier.Postal.HasOriginalValue(x => x.City)
            || supplier.Postal.HasOriginalValue(x => x.State)
            || supplier.Postal.HasOriginalValue(x => x.PostCode);
        if (shouldRepost)
        {
            return true;
        }

        if(supplier.SupplierStatus.HasOriginalValue(x => x.ID))
        {
            var originalID = supplier.SupplierStatus.GetOriginalValue(x => x.ID);
            var currentID = supplier.SupplierStatus.ID;

            var statuses = DbFactory.NewProvider(Logger.Main).Query(
                new Filter<SupplierStatus>(x => x.ID).IsEqualTo(originalID).Or(x => x.ID).IsEqualTo(currentID),
                Columns.None<SupplierStatus>().Add(x => x.ID).Add(x => x.Active))
                .ToArray<SupplierStatus>();
            if (statuses.Length == 2 && statuses[0].Active != statuses[1].Active)
            {
                return true;
            }
        }
        return false;
    }

}
public class SupplierMYOBPoster : IMYOBPoster<Supplier, SupplierMYOBPosterSettings>, IAutoRefreshPoster<Supplier, SupplierMYOBAutoRefresher>
{
    public ScriptDocument? Script { get; set; }
    public MYOBConnectionData ConnectionData { get; set; }
    public SupplierMYOBPosterSettings Settings { get; set; }
    public MYOBGlobalPosterSettings GlobalSettings { get; set; }

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

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

        return true;
    }

    #region Script Functions

    private Result<Exception> ProcessSupplier(IDataModel<Supplier> model, Supplier supplier, MYOBSupplier myobSupplier)
    {
        return this.WrapScript("ProcessSupplier", model, supplier, myobSupplier);
    }

    #endregion

    public static Columns<Supplier> RequiredColumns()
    {
        return Columns.None<Supplier>()
            .Add(x => x.ID)
            .Add(x => x.PostedReference)
            .Add(x => x.PostedStatus)
            .Add(x => x.Name)
            .Add(x => x.Code)
            .Add(x => x.SupplierStatus.ID)
            .Add(x => x.SupplierStatus.Active)
            .Add(x => x.Postal.Street)
            .Add(x => x.Postal.City)
            .Add(x => x.Postal.State)
            .Add(x => x.Postal.PostCode)
            .Add(x => x.Delivery.Street)
            .Add(x => x.Delivery.City)
            .Add(x => x.Delivery.State)
            .Add(x => x.Delivery.PostCode)
            .Add(x => x.Email)
            .Add(x => x.Telephone)
            .Add(x => x.ABN);
    }

    public static Result<Exception> UpdateSupplier(MYOBConnectionData data, MYOBGlobalPosterSettings settings, Supplier supplier, MYOBSupplier myobSupplier, bool isNew)
    {
        // Documentation: https://developer.myob.com/api/myob-business-api/v2/contact/supplier/

        // Since this might be called from some other poster, we need to ensure we have the right columns.
        Client.EnsureColumns(supplier, RequiredColumns());

        // ContactMYOBUtils.SplitName(supplier.DefaultContact.Name, out var firstName, out var lastName);

        myobSupplier.CompanyName = supplier.Name.Truncate(50);
        // myobSupplier.FirstName = 
        // myobSupplier.LastName = 
        myobSupplier.IsIndividual = false;
        myobSupplier.DisplayID = supplier.Code.Truncate(15);
        // If there is not customer status, we will use default to Active = true.
        myobSupplier.IsActive = supplier.SupplierStatus.ID == Guid.Empty || supplier.SupplierStatus.Active;
        myobSupplier.Addresses =
        [
            ContactMYOBUtils.ConvertAddress(supplier.Postal, 1, new Contact
            {
                Email = supplier.Email,
                Telephone = supplier.Telephone
            }),
            ContactMYOBUtils.ConvertAddress(supplier.Delivery, 2, new Contact
            {
                Email = supplier.Email,
                Telephone = supplier.Telephone
            })
        ];
        // Notes = 
        // PhotoURI =
        // RowVersion = 
        myobSupplier.BuyingDetails ??= new();
        // myobSupplier.BuyingDetails.PurchaseLayout = 
        // myobCustomer.BuyingDetails.PrintedForm = 
        // myobSupplier.BuyingDetails.PurchaseOrderDelivery = 
        // myobCustomer.BuyingDetails.ExpenseAccount.UID = 
        // myobCustomer.BuyingDetails.PaymentMemo = 
        // myobCustomer.BuyingDetails.PurchaseComment = 
        // myobCustomer.BuyingDetails.SupplierBillingRate = 
        // myobCustomer.BuyingDetails.ShippingMethod = 
        // myobCustomer.BuyingDetails.IsReportable = 
        // myobCustomer.BuyingDetails.CostPerHour = 
        // myobCustomer.BuyingDetails.Credit.Limit = 
        myobSupplier.BuyingDetails.ABN = supplier.ABN.Truncate(14);
        // myobCustomer.BuyingDetails.ABNBranch
        // myobCustomer.BuyingDetails.TaxIdNumber

        if (isNew)
        {
            if(!MYOBPosterUtils.GetDefaultTaxCode(data, settings).Get(out var taxID, out var error))
            {
                return Result.Error(error);
            }
            myobSupplier.BuyingDetails.TaxCode ??= new();
            myobSupplier.BuyingDetails.TaxCode.UID = taxID;
            myobSupplier.BuyingDetails.FreightTaxCode ??= new();
            myobSupplier.BuyingDetails.FreightTaxCode.UID = taxID;
        }
        // myobCustomer.BuyingDetails.UseSupplierTaxCode
        // myobCustomer.BuyingDetails.Terms

        // myobCustomer.PaymentDetails
        // myobCustomer.PhotoURI

        return Result.Ok();
    }

    /// <summary>
    /// Try to find a supplier in MYOB which matches <paramref name="supplier"/>, and if this fails, create a new one.
    /// </summary>
    /// <remarks>
    /// After this has finished, <paramref name="supplier"/> will be updated with <see cref="Supplier.PostedReference"/> set to the correct ID.
    /// <br/>
    /// <paramref name="supplier"/> needs to have at least <see cref="Supplier.Code"/> and <see cref="Supplier.PostedReference"/> as loaded columns.
    /// </remarks>
    /// <param name="data"></param>
    /// <param name="supplier">The supplier to map to.</param>
    /// <returns>The UID of the MYOB supplier.</returns>
    public static Result<Guid, Exception> MapSupplier(MYOBConnectionData data, Supplier supplier, MYOBGlobalPosterSettings settings)
    {
        if(Guid.TryParse(supplier.PostedReference, out var myobID))
        {
            return Result.Ok(myobID);
        }

        var service = new SupplierService(data.Configuration, null, data.AuthKey);
        var result = service.Query(data, new Filter<MYOBSupplier>(x => x.DisplayID).IsEqualTo(supplier.Code), top: 1);
        return result.MapOk(suppliers =>
        {
            if(suppliers.Items.Length == 0)
            {
                if(supplier.Code.Length > 15)
                {
                    return Result.Error(new Exception("Customer code is longer than 15 characters"));
                }
                var myobSupplier = new MYOBSupplier();
                return UpdateSupplier(data, settings, supplier, myobSupplier, true)
                    .MapOk(() => service.Save(data, myobSupplier)
                        .MapOk(x =>
                        {
                            supplier.PostedReference = x.UID.ToString();
                            // Marking as repost because a script may not have run.
                            supplier.PostedStatus = PostedStatus.RequiresRepost;
                            return x.UID;
                        })).Flatten();
            }
            else
            {
                supplier.PostedReference = suppliers.Items[0].UID.ToString();
                supplier.PostedStatus = PostedStatus.RequiresRepost;
                return Result.Ok(suppliers.Items[0].UID);
            }
        }).Flatten();
    }

    private static bool IsBlankCode(string code)
    {
        return code.IsNullOrWhiteSpace() || code.Equals("*None");
    }

    public IPullResult<Supplier> Pull()
    {
        var result = new PullResult<Supplier>();

        var top = 400;
        var skip = 0;

        var supplierCodes = new HashSet<string>();

        var service = new SupplierService(ConnectionData.Configuration, null, ConnectionData.AuthKey);
        while (true)
        {
            if(!service.Query(ConnectionData, null, top: top, skip: skip).Get(out var myobSuppliers, out var error))
            {
                CoreUtils.LogException("", error);
                throw new PullFailedMessageException(error.Message);
            }
            if(myobSuppliers.Items.Length == 0)
            {
                break;
            }

            var myobIDs = myobSuppliers.Items.ToArray(x => x.UID.ToString());
            var myobCodes = myobSuppliers.Items.Select(x => x.DisplayID).Where(x => !IsBlankCode(x)).ToArray();
            var myobNames = myobSuppliers.Items.Where(x => IsBlankCode(x.DisplayID) && !x.CompanyName.IsNullOrWhiteSpace())
                .Select(x => x.CompanyName).ToArray();

            var suppliers = Client.Query(
                new Filter<Supplier>(x => x.PostedReference).InList(myobIDs)
                    .Or(x => x.Code).InList(myobCodes)
                    .Or(x => x.Name).InList(myobNames),
                Columns.None<Supplier>().Add(x => x.ID).Add(x => x.PostedReference).Add(x => x.Code).Add(x => x.Name))
                .ToArray<Supplier>();
            var supplierDict = suppliers.Where(x => !x.PostedReference.IsNullOrWhiteSpace())
                .ToDictionary(x => x.PostedReference);
            var blankSuppliers = suppliers.Where(x => x.PostedReference.IsNullOrWhiteSpace()).ToArray();

            var needCodes = new Dictionary<string, (string prefix, int i, Supplier supplier)>();

            foreach(var myobSupplier in myobSuppliers.Items)
            {
                if (supplierDict.TryGetValue(myobSupplier.UID.ToString(), out var supplier))
                {
                    // Skipping existing suppliers at this point.
                    continue;
                }
                supplier = !IsBlankCode(myobSupplier.DisplayID)
                    ? blankSuppliers.FirstOrDefault(x => string.Equals(x.Code, myobSupplier.DisplayID))
                    : blankSuppliers.FirstOrDefault(x => string.Equals(x.Name, myobSupplier.CompanyName));
                if(supplier is not null)
                {
                    supplier.PostedReference = myobSupplier.UID.ToString();
                    result.AddEntity(PullResultType.Linked, supplier);
                    continue;
                }

                supplier = new Supplier();

                string code;
                if (!IsBlankCode(myobSupplier.DisplayID))
                {
                    code = myobSupplier.DisplayID.ToString();
                }
                else if (!myobSupplier.CompanyName.IsNullOrWhiteSpace())
                {
                    code = myobSupplier.CompanyName[..Math.Min(3, myobSupplier.CompanyName.Length)].ToUpper();
                }
                else
                {
                    code = "SUP";
                }
                int i = 1;
                supplier.Code = code;
                while (supplierCodes.Contains(supplier.Code))
                {
                    supplier.Code = $"{code}{i:d3}";
                    ++i;
                }
                supplierCodes.Add(supplier.Code);

                supplier.Name = myobSupplier.CompanyName;
                supplier.ABN = myobSupplier.BuyingDetails.ABN;

                if(myobSupplier.Addresses is not null)
                {
                    var delivery = myobSupplier.Addresses.FirstOrDefault(x => x.Location == 2);
                    if(delivery is not null)
                    {
                        supplier.Delivery.CopyFrom(ContactMYOBUtils.ConvertAddress(delivery));
                    }
                    var postal = myobSupplier.Addresses.FirstOrDefault(x => x.Location == 1);
                    if(postal is not null)
                    {
                        supplier.Postal.CopyFrom(ContactMYOBUtils.ConvertAddress(postal));
                    }
                    supplier.Email = delivery?.Email ?? postal?.Email ?? "";
                }

                supplier.PostedReference = myobSupplier.UID.ToString();
                result.AddEntity(PullResultType.New, supplier);
                needCodes.Add(supplier.Code, (code, i, supplier));
            }

            // Do code clash checking
            while(needCodes.Count > 0)
            {
                var codes = Client.Query(
                    new Filter<Supplier>(x => x.Code).InList(needCodes.Values.Select(x => x.supplier.Code).ToArray()),
                    Columns.None<Supplier>().Add(x => x.Code));
                var newNeedCodes = new Dictionary<string, (string prefix, int i, Supplier supplier)>();
                foreach(var row in codes.Rows)
                {
                    var code = row.Get<Supplier, string>(x => x.Code);
                    if(needCodes.Remove(code, out var needed))
                    {
                        int i = needed.i;
                        do
                        {
                            needed.supplier.Code = $"{needed.prefix}{i:d3}";
                            ++i;
                        } while (supplierCodes.Contains(needed.supplier.Code));
                        supplierCodes.Add(needed.supplier.Code);
                        newNeedCodes.Add(needed.supplier.Code, (needed.prefix, i, needed.supplier));
                    }
                }
                needCodes = newNeedCodes;
            }

            skip += top;
        }

        return result;
    }

    public IPostResult<Supplier> Process(IDataModel<Supplier> model)
    {
        var results = new PostResult<Supplier>();

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

        var suppliers = model.GetTable<Supplier>().ToArray<Supplier>();
        
        foreach(var supplier in suppliers)
        {
            if(supplier.Code.Length > 15)
            {
                results.AddFailed(supplier, "Code is longer than 15 characters.");
                continue;
            }

            bool isNew;
            MYOBSupplier myobSupplier;
            Exception? error;
            if(Guid.TryParse(supplier.PostedReference, out var myobID))
            {
                if(!service.Get(ConnectionData, myobID).Get(out var newSupplier, out error))
                {
                    CoreUtils.LogException("", error, $"Failed to find Supplier in MYOB with id {myobID}");
                    results.AddFailed(supplier, $"Failed to find Supplier in MYOB with id {myobID}: {error.Message}");
                    continue;
                }
                myobSupplier = newSupplier;
                isNew = false;
            }
            else
            {
                if(service.Query(
                    ConnectionData,
                    new Filter<MYOBSupplier>(x => x.DisplayID).IsEqualTo(supplier.Code),
                    top: 1).Get(out var myobSuppliers, out error))
                {
                    if(myobSuppliers.Items.Length > 0)
                    {
                        myobSupplier = myobSuppliers.Items[0];
                        isNew = false;
                    }
                    else if(service.Query(
                        ConnectionData,
                        new Filter<MYOBSupplier>(x => x.CompanyName).IsEqualTo(supplier.Name)
                            .And(new Filter<MYOBSupplier>(x => x.DisplayID).IsEqualTo(null)
                                .Or(x => x.DisplayID).IsEqualTo("")
                                .Or(x => x.DisplayID).IsEqualTo("*None")),
                        top: 1).Get(out myobSuppliers, out error))
                    {
                        if(myobSuppliers.Items.Length > 0)
                        {
                            myobSupplier = myobSuppliers.Items[0];
                            myobSupplier.DisplayID = supplier.Code;
                            isNew = false;
                        }
                        else
                        {
                            myobSupplier = new MYOBSupplier();
                            isNew = true;
                        }
                    }
                    else
                    {
                        CoreUtils.LogException("", error);
                        results.AddFailed(supplier, error.Message);
                        continue;
                    }
                }
                else
                {
                    CoreUtils.LogException("", error);
                    results.AddFailed(supplier, error.Message);
                    continue;
                }
            }

            if(UpdateSupplier(ConnectionData, GlobalSettings, supplier, myobSupplier, isNew)
                .MapOk(() => ProcessSupplier(model, supplier, myobSupplier)).Flatten()
                .MapOk(() => service.Save(ConnectionData, myobSupplier)).Flatten()
                .Get(out var result, out error))
            {
                supplier.PostedReference = result.UID.ToString();
                results.AddSuccess(supplier);
            }
            else
            {
                CoreUtils.LogException("", error, $"Error while posting supplier {supplier.ID}");
                results.AddFailed(supplier, error.Message);
            }
        }

        return results;
    }
}
public class SupplierMYOBPosterEngine<T> : MYOBPosterEngine<Supplier, SupplierMYOBPoster, SupplierMYOBPosterSettings>, IPullerEngine<Supplier, SupplierMYOBPoster>
{
    public IPullResult<Supplier> DoPull()
    {
        LoadConnectionData();
        return Poster.Pull();
    }
}