using MediatR;
using MinAttest.Application.Abstractions;
using MinAttest.Contracts.Attests;
using MinAttest.Domain.Entities;

namespace MinAttest.Application.Features.Attests.Commands;

public record PersonUploadAttestCommand(Guid PersonId, PersonAttestUploadRequest Request) : IRequest<Guid?>;

public class PersonUploadAttestCommandHandler(IAppDbContext db) : IRequestHandler<PersonUploadAttestCommand, Guid?>
{
    public async Task<Guid?> Handle(PersonUploadAttestCommand request, CancellationToken cancellationToken)
    {
        var r = request.Request;

        var person = await db.Persons.FindAsync([request.PersonId], cancellationToken);
        if (person is null) return null;

        byte[]? content = null;
        long? length = null;
        if (!string.IsNullOrWhiteSpace(r.ContentBase64))
        {
            try { content = Convert.FromBase64String(r.ContentBase64); length = content.LongLength; }
            catch (FormatException) { return null; }
        }

        var a = new Attest
        {
            Id = Guid.NewGuid(),
            PersonId = request.PersonId,
            EmployerId = null,
            Title = r.Title,
            From = r.From,
            To = r.To,
            Summary = r.Summary,
            BlobPath = r.BlobPath,
            BlobHash = r.BlobHash,
            Content = content,
            ContentType = r.ContentType,
            ContentLength = length,
            IssuedAt = DateTimeOffset.UtcNow
        };

        db.Attests.Add(a);
        await db.SaveChangesAsync(cancellationToken);
        return a.Id;
    }
}