using Grand.Business.Core.Interfaces.Catalog.Tax;
using Grand.Business.Core.Interfaces.Common.Addresses;
using Grand.Business.Core.Interfaces.Common.Directory;
using Grand.Business.Core.Interfaces.Customers;
using Grand.Business.Core.Interfaces.Marketing.Newsletters;
using Grand.Business.Core.Interfaces.Messages;
using Grand.Domain.Common;
using Grand.Domain.Customers;
using Grand.Domain.Localization;
using Grand.Domain.Messages;
using Grand.Domain.Tax;
using Grand.Web.Commands.Models.Customers;
using MediatR;

namespace Grand.Web.Commands.Handler.Customers;

public class CustomerRegisteredCommandHandler : IRequestHandler<CustomerRegisteredCommand, bool>
{
    private readonly IAddressAttributeService _addressAttributeService;
    private readonly AddressSettings _addressSettings;
    private readonly IVatService _checkVatService;
    private readonly ICountryService _countryService;
    private readonly ICustomerService _customerService;
    private readonly CustomerSettings _customerSettings;
    private readonly LanguageSettings _languageSettings;
    private readonly IMessageProviderService _messageProviderService;
    private readonly INewsLetterSubscriptionService _newsLetterSubscriptionService;

    private readonly TaxSettings _taxSettings;

    public CustomerRegisteredCommandHandler(
        IVatService checkVatService,
        IMessageProviderService messageProviderService,
        INewsLetterSubscriptionService newsLetterSubscriptionService,
        IAddressAttributeService addressAttributeService,
        ICountryService countryService,
        ICustomerService customerService,
        TaxSettings taxSettings,
        CustomerSettings customerSettings,
        AddressSettings addressSettings,
        LanguageSettings languageSettings)
    {
        _checkVatService = checkVatService;
        _messageProviderService = messageProviderService;
        _newsLetterSubscriptionService = newsLetterSubscriptionService;
        _addressAttributeService = addressAttributeService;
        _countryService = countryService;
        _customerService = customerService;
        _taxSettings = taxSettings;
        _customerSettings = customerSettings;
        _addressSettings = addressSettings;
        _languageSettings = languageSettings;
    }

    public async Task<bool> Handle(CustomerRegisteredCommand request, CancellationToken cancellationToken)
    {
        //VAT number
        if (_taxSettings.EuVatEnabled)
        {
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.VatNumber,
                request.Model.VatNumber);

            var vat = await _checkVatService.GetVatNumberStatus(request.Model.VatNumber);

            await _customerService.UpdateUserField(request.Customer,
                SystemCustomerFieldNames.VatNumberStatusId,
                (int)vat.status);
        }

        //form fields
        if (_customerSettings.GenderEnabled)
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.Gender,
                request.Model.Gender);
        await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.FirstName,
            request.Model.FirstName);
        await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.LastName,
            request.Model.LastName);
        if (_customerSettings.DateOfBirthEnabled)
        {
            var dateOfBirth = request.Model.ParseDateOfBirth();
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.DateOfBirth, dateOfBirth);
        }

        if (_customerSettings.CompanyEnabled)
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.Company,
                request.Model.Company);
        if (_customerSettings.StreetAddressEnabled)
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.StreetAddress,
                request.Model.StreetAddress);
        if (_customerSettings.StreetAddress2Enabled)
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.StreetAddress2,
                request.Model.StreetAddress2);
        if (_customerSettings.ZipPostalCodeEnabled)
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.ZipPostalCode,
                request.Model.ZipPostalCode);
        if (_customerSettings.CityEnabled)
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.City, request.Model.City);
        if (_customerSettings.CountryEnabled)
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.CountryId,
                request.Model.CountryId);
        if (_customerSettings.CountryEnabled && _customerSettings.StateProvinceEnabled)
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.StateProvinceId,
                request.Model.StateProvinceId);
        if (_customerSettings.PhoneEnabled)
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.Phone,
                request.Model.Phone);
        if (_customerSettings.FaxEnabled)
            await _customerService.UpdateUserField(request.Customer, SystemCustomerFieldNames.Fax, request.Model.Fax);

        //newsletter
        if (_customerSettings.NewsletterEnabled)
        {
            var categories = request.Model.SelectedNewsletterCategory?.ToList();
            //save newsletter value
            var newsletter =
                await _newsLetterSubscriptionService.GetNewsLetterSubscriptionByEmailAndStoreId(request.Model.Email,
                    request.Store.Id);
            if (newsletter != null)
            {
                newsletter.Categories.Clear();
                categories?.ForEach(x => newsletter.Categories.Add(x));
                if (request.Model.Newsletter)
                {
                    newsletter.Active = true;
                    await _newsLetterSubscriptionService.UpdateNewsLetterSubscription(newsletter);
                }
            }
            else
            {
                if (request.Model.Newsletter)
                {
                    var newsLetterSubscription = new NewsLetterSubscription {
                        NewsLetterSubscriptionGuid = Guid.NewGuid(),
                        Email = request.Model.Email,
                        CustomerId = request.Customer.Id,
                        Active = true,
                        StoreId = request.Store.Id
                    };
                    categories?.ForEach(x => newsLetterSubscription.Categories.Add(x));
                    await _newsLetterSubscriptionService.InsertNewsLetterSubscription(newsLetterSubscription);
                }
            }
        }

        //save customer attributes
        await _customerService.UpdateCustomerField(request.Customer, x => x.Attributes, request.CustomerAttributes);

        //insert default address (if possible)
        var defaultAddress = new Address {
            FirstName = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.FirstName),
            LastName = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.LastName),
            Email = request.Customer.Email,
            Company = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.Company),
            VatNumber = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.VatNumber),
            CountryId =
                !string.IsNullOrEmpty(
                    request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.CountryId))
                    ? request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.CountryId)
                    : "",
            StateProvinceId =
                !string.IsNullOrEmpty(
                    request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.StateProvinceId))
                    ? request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.StateProvinceId)
                    : "",
            City = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.City),
            Address1 = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.StreetAddress),
            Address2 = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.StreetAddress2),
            ZipPostalCode = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.ZipPostalCode),
            PhoneNumber = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.Phone),
            FaxNumber = request.Customer.GetUserFieldFromEntity<string>(SystemCustomerFieldNames.Fax)
        };

        if (await IsAddressValid(defaultAddress))
        {
            //set default address
            request.Customer.Addresses.Add(defaultAddress);
            await _customerService.InsertAddress(defaultAddress, request.Customer.Id);
            request.Customer.BillingAddress = defaultAddress;
            await _customerService.UpdateBillingAddress(defaultAddress, request.Customer.Id);
            request.Customer.ShippingAddress = defaultAddress;
            await _customerService.UpdateShippingAddress(defaultAddress, request.Customer.Id);
        }

        //notifications
        if (_customerSettings.NotifyNewCustomerRegistration)
            await _messageProviderService.SendCustomerRegisteredMessage(request.Customer, request.Store,
                _languageSettings.DefaultAdminLanguageId);

        //New customer has a free shipping for the first order
        if (_customerSettings.RegistrationFreeShipping)
            await _customerService.UpdateCustomerField(request.Customer, x => x.FreeShipping, true);

        return true;
    }

    /// <summary>
    ///     Gets a value indicating whether address is valid (can be saved)
    /// </summary>
    /// <param name="address">Address to validate</param>
    /// <returns>Result</returns>
    private async Task<bool> IsAddressValid(Address address)
    {
        ArgumentNullException.ThrowIfNull(address);

        if (string.IsNullOrWhiteSpace(address.FirstName))
            return false;

        if (string.IsNullOrWhiteSpace(address.LastName))
            return false;

        if (string.IsNullOrWhiteSpace(address.Email))
            return false;

        if (_addressSettings.CompanyEnabled &&
            _addressSettings.CompanyRequired &&
            string.IsNullOrWhiteSpace(address.Company))
            return false;

        if (_addressSettings.VatNumberEnabled &&
            _addressSettings.VatNumberRequired &&
            string.IsNullOrWhiteSpace(address.VatNumber))
            return false;

        if (_addressSettings.StreetAddressEnabled &&
            _addressSettings.StreetAddressRequired &&
            string.IsNullOrWhiteSpace(address.Address1))
            return false;

        if (_addressSettings.StreetAddress2Enabled &&
            _addressSettings.StreetAddress2Required &&
            string.IsNullOrWhiteSpace(address.Address2))
            return false;

        if (_addressSettings.ZipPostalCodeEnabled &&
            _addressSettings.ZipPostalCodeRequired &&
            string.IsNullOrWhiteSpace(address.ZipPostalCode))
            return false;


        if (_addressSettings.CountryEnabled)
        {
            if (string.IsNullOrEmpty(address.CountryId))
                return false;

            var country = await _countryService.GetCountryById(address.CountryId);
            if (country == null)
                return false;

            if (_addressSettings.StateProvinceEnabled)
            {
                var states = country.StateProvinces;
                if (states.Any())
                {
                    if (string.IsNullOrEmpty(address.StateProvinceId))
                        return false;

                    var state = states.FirstOrDefault(x => x.Id == address.StateProvinceId);
                    if (state == null)
                        return false;
                }
            }
        }

        if (_addressSettings.CityEnabled &&
            _addressSettings.CityRequired &&
            string.IsNullOrWhiteSpace(address.City))
            return false;

        if (_addressSettings.PhoneEnabled &&
            _addressSettings.PhoneRequired &&
            string.IsNullOrWhiteSpace(address.PhoneNumber))
            return false;

        if (_addressSettings.FaxEnabled &&
            _addressSettings.FaxRequired &&
            string.IsNullOrWhiteSpace(address.FaxNumber))
            return false;

        var attributes = await _addressAttributeService.GetAllAddressAttributes();
        return !attributes.Any(x => x.IsRequired);
    }
}