using LiteCqrs;
using Microsoft.EntityFrameworkCore;
using TeleWave.Application.Common.Interfaces;
using TeleWave.Application.Common.Models;

namespace TeleWave.Application.Broadcast.Bumpers;

public sealed class AddBumperTextVariantCommandHandler(IAppDbContext dbContext)
    : ICommandHandler<AddBumperTextVariantCommand, Result<Guid>>
{
    public async Task<Result<Guid>> Handle(
        AddBumperTextVariantCommand command,
        CancellationToken cancellationToken
    )
    {
        var channel = await dbContext
            .Channels.Include(c => c.BumperTemplates)
                .ThenInclude(t => t.Variants)
            .AsSplitQuery()
            .FirstOrDefaultAsync(c => c.Id == command.ChannelId, cancellationToken);
        if (channel is null)
            return Result.Failure<Guid>(ChannelErrors.NotFound);

        var template = channel.FindBumperTemplate(command.TemplateId);
        if (template is null)
            return Result.Failure<Guid>(ChannelErrors.BumperTemplateNotFound);

        var name = string.IsNullOrWhiteSpace(command.Name)
            ? $"Текст {template.Variants.Count + 1}"
            : command.Name.Trim();
        var variant = template.AddVariant(name);
        return Result.Success(variant.Id);
    }
}
