using ErsatzTV.Core;
using ErsatzTV.Core.Api.ChannelTemplates;
using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Interfaces.Repositories;
using ErsatzTV.Infrastructure.Data;
using Microsoft.EntityFrameworkCore;

namespace ErsatzTV.Application.ChannelTemplates;

public class CreateChannelTemplateHandler(
    IDbContextFactory<TvContext> dbContextFactory,
    IConfigElementRepository configElementRepository)
    : IRequestHandler<CreateChannelTemplate, Either<BaseError, ChannelTemplateResponseModel>>
{
    public async Task<Either<BaseError, ChannelTemplateResponseModel>> Handle(
        CreateChannelTemplate request,
        CancellationToken cancellationToken)
    {
        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
        Option<BaseError> maybeError =
            await ChannelTemplateCommandBase.ValidateCommon(dbContext, request, null, cancellationToken);
        foreach (BaseError error in maybeError)
        {
            return error;
        }

        var template = new ChannelTemplate();
        request.ApplyTo(template);
        await dbContext.ChannelTemplates.AddAsync(template, cancellationToken);
        await dbContext.SaveChangesAsync(cancellationToken);

        int? defaultTemplateId =
            await ChannelTemplateDefault.GetDefaultTemplateId(configElementRepository, cancellationToken);
        return ChannelTemplateMapper.ProjectToResponseModel(template, defaultTemplateId);
    }
}