using ReserveManagementSystemLib.Models;
using ReserveManagementSystemLib.Repositories;

namespace ReserveManagementSystemApi.Services
{
    public class DealerService: IDealerService
    {
        private readonly IDealerRepository _dealerRepository;

        public DealerService(IDealerRepository dealerRepository)
        {
            _dealerRepository = dealerRepository;
        }

        public async Task<IEnumerable<Dealer>> Search(string dealerSearchText)
        {
            try
            {
                return await _dealerRepository.GetAll().Where(d => d.DealerCode.Contains(dealerSearchText) || d.Name.Contains(dealerSearchText)).OrderBy(x => x.DealerCode).ToListAsync();
            }
            catch (Exception ex)
            {
                Log.Error(ex, "Failure retrieving dealers.");
                throw;
            }
        }

        public async Task<Dealer> GetDealerByCodeAsync(string dealerCode)
        {
            try
            {
                return await _dealerRepository.FindByCodeAsync(dealerCode);
            }
            catch (Exception ex)
            {
                Log.Error(ex, "Failure retrieving dealer by code.");
                throw;
            }
        }

        public async Task<IEnumerable<Dealer>> GetAllDealersAsync()
        {
            return await _dealerRepository.GetAll().ToListAsync();
        }

        public async Task UpdateDealersAsync(List<Dealer> dealers)
        {
            try
            {
                var allDealers = await GetAllDealersAsync();
                var dealersToAdd = new List<Dealer>();
                var dealersToUpdate = new List<Dealer>();
                dealers.ForEach(d =>
                {
                    var currentDealer = allDealers.FirstOrDefault(a => a.DealerOrganizationNumber == d.DealerOrganizationNumber);
                    if (currentDealer != null && !currentDealer.Equals(d))
                    {
                        currentDealer.Name = d.Name ?? currentDealer.Name;
                        currentDealer.DealerCode = d.DealerCode?.ToUpper() ?? currentDealer.DealerCode;
                        currentDealer.DealerAccountNumber = d.DealerAccountNumber ?? currentDealer.DealerAccountNumber;
                        currentDealer.DealerOrganizationNumber = d.DealerOrganizationNumber ?? currentDealer.DealerOrganizationNumber;
                        dealersToUpdate.Add(currentDealer);
                    }
                    else if (currentDealer == null)
                    {
                        //write the new dealer record to set Action required to true if invalid
                        dealersToAdd.Add(d);
                    }
                });
                if (dealersToUpdate.Any())
                {
                    await _dealerRepository.UpdateDealersAsync(dealersToUpdate);
                }
                if (dealersToAdd.Any())
                {
                    await _dealerRepository.AddDealersAsync(dealersToAdd);
                }
            }
            catch (Exception ex)
            {
                Log.Error(ex, "Failure updating dealers.");
                throw;
            }
        }

        public async Task UpdateDealersAsync(List<Loan> loans)
        {
            var dealers = loans.Select(l => new Dealer
            {
                DealerCode = l.Dealer.DealerCode,
                Name = l.Dealer.Name,
                DealerOrganizationNumber = l.DealerOrganizationNumber,
                DealerAccountNumber = l.Dealer.DealerAccountNumber
            })
            .GroupBy(d => d.DealerOrganizationNumber).Select(g => g.First()).ToList();

            await UpdateDealersAsync(dealers);
        }
    }
}