64 lines
2.5 KiB
C#
64 lines
2.5 KiB
C#
using System.Threading.Channels;
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using ErsatzTV.Application.Playouts;
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using ErsatzTV.Core;
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using ErsatzTV.Core.Domain;
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using ErsatzTV.Core.Scheduling;
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using ErsatzTV.Infrastructure.Data;
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using Microsoft.EntityFrameworkCore;
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using static ErsatzTV.Application.ProgramSchedules.Mapper;
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namespace ErsatzTV.Application.ProgramSchedules;
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public class AddProgramScheduleItemHandler : ProgramScheduleItemCommandBase,
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IRequestHandler<AddProgramScheduleItem, Either<BaseError, ProgramScheduleItemViewModel>>
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{
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private readonly ChannelWriter<IBackgroundServiceRequest> _channel;
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private readonly IDbContextFactory<TvContext> _dbContextFactory;
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public AddProgramScheduleItemHandler(
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IDbContextFactory<TvContext> dbContextFactory,
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ChannelWriter<IBackgroundServiceRequest> channel)
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{
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_dbContextFactory = dbContextFactory;
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_channel = channel;
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}
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public async Task<Either<BaseError, ProgramScheduleItemViewModel>> Handle(
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AddProgramScheduleItem request,
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CancellationToken cancellationToken)
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{
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await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync(cancellationToken);
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Validation<BaseError, ProgramSchedule> validation = await Validate(dbContext, request, cancellationToken);
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return await validation.Apply(ps => PersistItem(dbContext, request, ps, cancellationToken));
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}
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private async Task<ProgramScheduleItemViewModel> PersistItem(
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TvContext dbContext,
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AddProgramScheduleItem request,
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ProgramSchedule programSchedule,
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CancellationToken cancellationToken)
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{
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int nextIndex = programSchedule.Items.Select(i => i.Index).DefaultIfEmpty(0).Max() + 1;
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ProgramScheduleItem item = BuildItem(programSchedule, nextIndex, request);
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programSchedule.Items.Add(item);
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await dbContext.SaveChangesAsync(cancellationToken);
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// refresh any playouts that use this schedule
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foreach (Playout playout in programSchedule.Playouts)
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{
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await _channel.WriteAsync(new BuildPlayout(playout.Id, PlayoutBuildMode.Refresh), cancellationToken);
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}
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return ProjectToViewModel(item);
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}
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private static Task<Validation<BaseError, ProgramSchedule>> Validate(
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TvContext dbContext,
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AddProgramScheduleItem request,
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CancellationToken cancellationToken) =>
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ProgramScheduleMustExist(dbContext, request.ProgramScheduleId, cancellationToken)
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.BindT(programSchedule => PlayoutModeMustBeValid(request, programSchedule));
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}
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