Foxchat.NET/Foxchat.Chat/Services/UserResolverService.cs

using Foxchat.Chat.Database;
using Foxchat.Chat.Database.Models;
using Foxchat.Core.Federation;
using Foxchat.Core.Models;
using Microsoft.EntityFrameworkCore;

namespace Foxchat.Chat.Services;

public class UserResolverService(ILogger logger, ChatContext db, RequestSigningService requestSigningService)
{
    public async Task<User> ResolveUserAsync(IdentityInstance instance, string userId)
    {
        var user = await db.Users.FirstOrDefaultAsync(u => u.InstanceId == instance.Id && u.RemoteUserId == userId);
        if (user != null)
        {
            // TODO: update user if it's been long enough
            return user;
        }

        var userResponse = await requestSigningService.RequestAsync<Users.User>(HttpMethod.Get, instance.Domain,
            $"/_fox/ident/users/{userId}");

        user = new User
        {
            Instance = instance,
            Username = userResponse.Username,
            RemoteUserId = userResponse.Id,
            Avatar = userResponse.AvatarUrl
        };

        db.Add(user);
        await db.SaveChangesAsync();
        return user;
    }
}