using ApiEfCoreLibrary.DTO.Loan.Request;
using ApiEfCoreLibrary.DTO.Loan.Response;
using FastEndpoints;
using Microsoft.EntityFrameworkCore;

namespace ApiEfCoreLibrary.Endpoints.Loan;

public class UpdateLoanEndpoint(LibraryDbContext database) : Endpoint<UpdateLoanDto, GetLoanDto>
{
    public override void Configure()
    {
        Put("/api/loans/{@Id}", x => new {x.Id});
        Roles("admin", "librarian");
    }

    public override async Task HandleAsync(UpdateLoanDto req, CancellationToken ct)
    {
        Models.Loan? loan = await database.Loans.SingleOrDefaultAsync(x => x.Id == req.Id, ct);

        if (loan == null)
        {
            await Send.NotFoundAsync(ct);
            return;
        }
        
        Models.Book? bookExists = await database.Books.FirstOrDefaultAsync(a => a.Id == req.BookId, ct);
        
        if (bookExists == null)
        {
            await Send.NoContentAsync(ct);
            return;
        }
        
        Models.User? userExists = await database.Users.FirstOrDefaultAsync(a => a.Id == req.UserId, ct);
        
        if (userExists == null)
        {
            await Send.NoContentAsync(ct);
            return;
        }

        loan.BookId = req.BookId;
        loan.UserId = req.UserId;
        loan.Date = req.Date;
        loan.PlannedReturningDate = req.PlannedReturningDate;
        loan.EffectiveReturningDate = req.EffectiveReturningDate;
        await database.SaveChangesAsync(ct);
        
        GetLoanDto responseDto = new()
        {
            Id = loan.Id,
            BookId = loan.BookId,
            UserId = loan.UserId,
            Date = loan.Date,
            PlannedReturningDate = loan.PlannedReturningDate,
            EffectiveReturningDate = loan.EffectiveReturningDate
        };
        
        await Send.OkAsync(responseDto, ct);
    }
}