using AutobusApi.Application.Common.Exceptions;
using AutobusApi.Application.Common.Interfaces;
using AutoMapper;
using AutoMapper.QueryableExtensions;
using MediatR;
using Microsoft.EntityFrameworkCore;

namespace AutobusApi.Application.Employees.Queries.GetEmployee;

public class GetEmployeeQueryHandler : IRequestHandler<GetEmployeeQuery, EmployeeDto>
{
    private readonly IApplicationDbContext _dbContext;
    private readonly IMapper _mapper;

    public GetEmployeeQueryHandler(
        IApplicationDbContext dbContext,
        IMapper mapper)
    {
        _dbContext = dbContext;
        _mapper = mapper;
    }

    public async Task<EmployeeDto> Handle(
        GetEmployeeQuery request,
        CancellationToken cancellationToken)
    {
        var employee = await _dbContext.Employees
            .ProjectTo<EmployeeDto>(_mapper.ConfigurationProvider)
            .SingleOrDefaultAsync(c => c.Id == request.Id);

        if (employee == null)
        {
            throw new NotFoundException();
        }

        return employee;
    }
}