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 UserInvitedEventHandler : IIntegrationEventHandler<UserInvitedEvent>
{
    private readonly UserNovelDataServiceDbContext _dbContext;
    private readonly ILogger<UserInvitedEventHandler> _logger;

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

    public async Task Handle(UserInvitedEvent @event)
    {
        var exists = await _dbContext.Users.AnyAsync(u => u.Id == @event.InvitedUserId);
        if (exists)
        {
            _logger.LogDebug("User {UserId} already exists, skipping", @event.InvitedUserId);
            return;
        }

        var user = new User
        {
            Id = @event.InvitedUserId,
            OAuthProviderId = @event.InvitedOAuthProviderId
        };
        _dbContext.Users.Add(user);
        await _dbContext.SaveChangesAsync();

        _logger.LogInformation("Created user stub for {UserId}", @event.InvitedUserId);
    }
}