using Comal.Classes;
using FastReport.Data;
using InABox.Core;
using InABox.Core.Postable;
using InABox.Poster.MYOB;
using MYOB.AccountRight.SDK.Services;
using MYOB.AccountRight.SDK.Services.Contact;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using Customer = Comal.Classes.Customer;
using MYOBCustomer = MYOB.AccountRight.SDK.Contracts.Version2.Contact.Customer;
using MYOBAddress = MYOB.AccountRight.SDK.Contracts.Version2.Contact.Address;
using MYOB.AccountRight.SDK.Contracts.Version2.Sale;
using InABox.Clients;
using InABox.Database;
using MYOB.AccountRight.SDK;
using InABox.Scripting;
using Org.BouncyCastle.Bcpg.OpenPgp;

namespace PRS.Shared.Posters.MYOB;

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

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

    public void ProcessCustomer(IDataModel<Customer> model, Customer customer, MYOBCustomer myobCustomer)
    {
        // Do extra processing for a customer; throw an exception to fail this customer.
    }
}";
    }
}

public static class ContactMYOBUtils
{
    public static void SplitName(string name, out string firstName, out string lastName)
    {
        var names = name.Split(' ', 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
        firstName = names.Length > 0 ? names[0] : "";
        lastName = names.Length > 1 ? names[1] : "";
    }

    public static Address ConvertAddress(MYOBAddress address)
    {
        var newAddress = new Address
        {
            Street = address.Street,
            City = address.City,
            State = address.State,
            PostCode = address.PostCode
        };
        return newAddress;
    }

    public static MYOBAddress ConvertAddress(Address address, int location, IContact contact)
    {
        var mobile = contact.Mobile.Truncate(21);
        var phone = contact.Telephone.Truncate(21);
        var newAddress = new MYOBAddress
        {
            Location = location,
            Street = address.Street.Truncate(255),
            City = address.City.Truncate(255),
            State = address.State.Truncate(255),
            PostCode = address.PostCode.Truncate(11),
            Email = contact.Email.Truncate(255),
            ContactName = contact.Name.Truncate(25)
        };
        if (mobile.IsNullOrWhiteSpace())
        {
            newAddress.Phone1 = phone;
        }
        else
        {
            newAddress.Phone1 = mobile;
            newAddress.Phone2 = phone;
        }
        return newAddress;
    }
}

public class CustomerMYOBAutoRefresher : IAutoRefresher<Customer>
{
    public bool ShouldRepost(Customer customer)
    {
        var shouldRepost = customer.HasOriginalValue(x => x.Name)
            || customer.HasOriginalValue(x => x.Code)
            || customer.HasOriginalValue(x => x.ABN)
            || customer.DefaultContact.HasOriginalValue(x => x.ID)
            || customer.Delivery.HasOriginalValue(x => x.Street)
            || customer.Delivery.HasOriginalValue(x => x.City)
            || customer.Delivery.HasOriginalValue(x => x.State)
            || customer.Delivery.HasOriginalValue(x => x.PostCode)
            || customer.Postal.HasOriginalValue(x => x.Street)
            || customer.Postal.HasOriginalValue(x => x.City)
            || customer.Postal.HasOriginalValue(x => x.State)
            || customer.Postal.HasOriginalValue(x => x.PostCode);
        if (shouldRepost)
        {
            return true;
        }

        if(customer.CustomerStatus.HasOriginalValue(x => x.ID))
        {
            var originalID = customer.CustomerStatus.GetOriginalValue(x => x.ID);
            var currentID = customer.CustomerStatus.ID;

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

}

public class CustomerMYOBPoster :
    IMYOBPoster<Customer, CustomerMYOBPosterSettings>,
    IAutoRefreshPoster<Customer, CustomerMYOBAutoRefresher>
{
    public ScriptDocument? Script { get; set; }

    public CustomerMYOBPosterSettings Settings { get; set; }
    public MYOBGlobalPosterSettings GlobalSettings { get; set; }

    public MYOBConnectionData ConnectionData { get; set; }

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

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

        return true;
    }

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

    #region Script Functions

    private Result<Exception> ProcessCustomer(IDataModel<Customer> model, Customer customer, MYOBCustomer myobCustomer)
    {
        return this.WrapScript("ProcessCustomer", model, customer, myobCustomer);
    }

    #endregion

    public static Result<Exception> UpdateCustomer(MYOBConnectionData data, MYOBGlobalPosterSettings settings, Customer customer, MYOBCustomer myobCustomer, bool isNew)
    {
        // Documentation: https://developer.myob.com/api/myob-business-api/v2/contact/customer/

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

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

        myobCustomer.CompanyName = customer.Name.Truncate(50);
        myobCustomer.FirstName = firstName.Truncate(30);
        myobCustomer.LastName = lastName.Truncate(20);
        myobCustomer.IsIndividual = false;
        myobCustomer.DisplayID = customer.Code.Truncate(15);
        // If there is not customer status, we will use default to Active = true.
        myobCustomer.IsActive = customer.CustomerStatus.ID == Guid.Empty || customer.CustomerStatus.Active;
        myobCustomer.Addresses =
        [
            ContactMYOBUtils.ConvertAddress(customer.Postal, 1, customer.DefaultContact),
            ContactMYOBUtils.ConvertAddress(customer.Delivery, 2, customer.DefaultContact)
        ];
        // Notes = 
        // PhotoURI =
        // RowVersion = 
        myobCustomer.SellingDetails ??= new();
        myobCustomer.SellingDetails.SaleLayout = InvoiceLayoutType.NoDefault;
        // myobCustomer.SellingDetails.PrintedFOrm = 
        myobCustomer.SellingDetails.InvoiceDelivery = DocumentAction.PrintAndEmail;
        // myobCustomer.SellingDetails.IncomeAccount = 
        // myobCustomer.SellingDetails.ReceiptMemo = 
        // myobCustomer.SellingDetails.SalesPerson = 
        // myobCustomer.SellingDetails.SaleComment = 
        // myobCustomer.SellingDetails.ShippingMethod = 
        // myobCustomer.SellingDetails.HourlyBillRate = 
        // myobCustomer.SellingDetails.ABNBranch = 
        myobCustomer.SellingDetails.ABN = customer.ABN.Truncate(14);

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

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

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

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

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

        var top = 400;
        var skip = 0;

        var customerCodes = new HashSet<string>();

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

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

            var customers = Client.Query(
                new Filter<Customer>(x => x.PostedReference).InList(myobIDs)
                    .Or(x => x.Code).InList(myobCodes)
                    .Or(x => x.Name).InList(myobNames),
                Columns.None<Customer>().Add(x => x.ID).Add(x => x.PostedReference).Add(x => x.Code).Add(x => x.Name))
                .ToArray<Customer>();
            var customerDict = customers.Where(x => !x.PostedReference.IsNullOrWhiteSpace())
                .ToDictionary(x => x.PostedReference);
            var blankCustomers = customers.Where(x => x.PostedReference.IsNullOrWhiteSpace()).ToArray();

            var needCodes = new Dictionary<string, (string prefix, int i, Customer customer)>();

            foreach(var myobCustomer in myobCustomers.Items)
            {
                if (customerDict.TryGetValue(myobCustomer.UID.ToString(), out var customer))
                {
                    // Skipping existing customers at this point.
                    continue;
                }
                customer = !IsBlankCode(myobCustomer.DisplayID)
                    ? blankCustomers.FirstOrDefault(x => string.Equals(x.Code, myobCustomer.DisplayID))
                    : blankCustomers.FirstOrDefault(x => string.Equals(x.Name, myobCustomer.CompanyName));
                if(customer is not null)
                {
                    customer.PostedReference = myobCustomer.UID.ToString();
                    result.AddEntity(PullResultType.Linked, customer);
                    continue;
                }

                customer = new Customer();

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

                customer.Name = myobCustomer.CompanyName;
                customer.ABN = myobCustomer.SellingDetails.ABN;

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

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

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

            skip += top;
        }

        return result;
    }

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

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

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

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

            if(UpdateCustomer(ConnectionData, GlobalSettings, customer, myobCustomer, isNew)
                .MapOk(() => ProcessCustomer(model, customer, myobCustomer)).Flatten()
                .MapOk(() => service.Save(ConnectionData, myobCustomer)).Flatten()
                .Get(out var result, out error))
            {
                customer.PostedReference = result.UID.ToString();
                results.AddSuccess(customer);
            }
            else
            {
                results.AddFailed(customer, error.Message);
            }
        }

        return results;
    }
}

public class CustomerMYOBPosterEngine<T> : MYOBPosterEngine<Customer, CustomerMYOBPoster, CustomerMYOBPosterSettings>, IPullerEngine<Customer, CustomerMYOBPoster>
{
    public IPullResult<Customer> DoPull()
    {
        LoadConnectionData();
        return Poster.Pull();
    }
}