using FictionArchive.Service.Shared.Services.EventBus;
using FictionArchive.Service.UserNovelDataService.Models.Database;
using FictionArchive.Service.UserNovelDataService.Models.IntegrationEvents;
using Microsoft.EntityFrameworkCore;

namespace FictionArchive.Service.UserNovelDataService.Services.EventHandlers;

public class NovelCreatedEventHandler : IIntegrationEventHandler<NovelCreatedEvent>
{
    private readonly UserNovelDataServiceDbContext _dbContext;
    private readonly ILogger<NovelCreatedEventHandler> _logger;

    public NovelCreatedEventHandler(
        UserNovelDataServiceDbContext dbContext,
        ILogger<NovelCreatedEventHandler> logger)
    {
        _dbContext = dbContext;
        _logger = logger;
    }

    public async Task Handle(NovelCreatedEvent @event)
    {
        var exists = await _dbContext.Novels.AnyAsync(n => n.Id == @event.NovelId);
        if (exists)
        {
            _logger.LogDebug("Novel {NovelId} already exists, skipping", @event.NovelId);
            return;
        }

        var novel = new Novel { Id = @event.NovelId };
        _dbContext.Novels.Add(novel);
        await _dbContext.SaveChangesAsync();

        _logger.LogInformation("Created novel stub for {NovelId}", @event.NovelId);
    }
}