using LCU.API.Internal.Operations.IncentiveApi.Exceptions;
using LCU.API.Internal.Operations.IncentiveApiLib.Repositories;
using LCU.Library.Internal.IncentiveApiModels.Entities;

namespace LCU.API.Internal.Operations.IncentiveApi.Services;

public class CommissionService : ICommissionService
{
    private readonly ICommissionRepository _commissionRepository;
    private readonly IUnitOfWork _unitOfWork;

    public CommissionService(ICommissionRepository commissionRepository, IUnitOfWork unitOfWork)
    {
        _commissionRepository = commissionRepository;
        _unitOfWork = unitOfWork;
    }

    public async Task<IReadOnlyCollection<Commission>> GetCommissionsAsync()
    {
        return await _commissionRepository.GetCommissionsAsync();
    }

    public async Task SaveCommissionsAsync(List<Commission> commissionsToSave)
    {
        foreach (var commission in commissionsToSave)
        {
            if (commission.Id == 0)
            {
                var existing = await _commissionRepository.FindExistingCommission(commission.Role, commission.Product);
                if (existing != null)
                {
                    throw new CommissionExistsException($"Commission already exists for Role={existing.Role.Name}, Product={existing.Product}");
                }

                await _commissionRepository.SaveCommission(commission);
            }
            else
            {
                var existing = await _commissionRepository.FindExistingCommission(commission.Id);
                if (existing != null)
                {
                    existing.RatePerProduct = commission.RatePerProduct;
                }
            }
        }

        await _unitOfWork.CompleteAsync();
    }
}