using ErsatzTV.Core.Interfaces.Scheduling;

namespace ErsatzTV.Application.Troubleshooting.Queries;

public class ValidateSequentialScheduleHandler(ISequentialScheduleValidator validator)
    : IRequestHandler<ValidateSequentialSchedule, ValidateSequentialScheduleViewModel>
{
    public async Task<ValidateSequentialScheduleViewModel> Handle(
        ValidateSequentialSchedule request,
        CancellationToken cancellationToken)
    {
        try
        {
            // ToJson runs first and can throw on malformed YAML (GetValidationMessages catches its
            // own exceptions internally); mirrors the Blazor YamlValidator ordering.
            string json = validator.ToJson(request.Yaml);
            IList<string> messages = await validator.GetValidationMessages(request.Yaml, request.IsImport);
            return new ValidateSequentialScheduleViewModel(messages.Count == 0, messages.ToList(), json);
        }
        catch (Exception ex)
        {
            return new ValidateSequentialScheduleViewModel(false, [ex.Message], string.Empty);
        }
    }
}