using MediatR;
using MyService.Domain.AggregatesModel.SampleAggregate;

namespace MyService.API.Application.Commands;

/// <summary>
/// EN: Handler for CreateSampleCommand.
/// VI: Handler cho CreateSampleCommand.
/// </summary>
public class CreateSampleCommandHandler : IRequestHandler<CreateSampleCommand, CreateSampleCommandResult>
{
    private readonly ISampleRepository _sampleRepository;
    private readonly ILogger<CreateSampleCommandHandler> _logger;

    public CreateSampleCommandHandler(
        ISampleRepository sampleRepository,
        ILogger<CreateSampleCommandHandler> logger)
    {
        _sampleRepository = sampleRepository ?? throw new ArgumentNullException(nameof(sampleRepository));
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }

    public async Task<CreateSampleCommandResult> Handle(
        CreateSampleCommand request,
        CancellationToken cancellationToken)
    {
        _logger.LogInformation(
            "Creating new sample with name: {Name} / Tạo sample mới với tên: {Name}",
            request.Name);

        // EN: Create domain entity / VI: Tạo domain entity
        var sample = new Sample(request.Name, request.Description);

        // EN: Add to repository / VI: Thêm vào repository
        _sampleRepository.Add(sample);

        // EN: Save changes (dispatches domain events) / VI: Lưu thay đổi (dispatch domain events)
        await _sampleRepository.UnitOfWork.SaveEntitiesAsync(cancellationToken);

        _logger.LogInformation(
            "Sample created successfully with ID: {SampleId} / Sample đã tạo thành công với ID: {SampleId}",
            sample.Id);

        return new CreateSampleCommandResult(sample.Id);
    }
}