using backend.Data;
using backend.Devices;
using Microsoft.EntityFrameworkCore;

namespace backend.DeviceHub;

public class DeviceAuth(AppDbContext db, DeviceTokenService tokens)
{
    public async Task<Device?> AuthenticateAsync(string? authHeader, CancellationToken ct)
    {
        if (string.IsNullOrEmpty(authHeader)) return null;
        const string prefix = "Bearer ";
        if (!authHeader.StartsWith(prefix, StringComparison.Ordinal)) return null;
        var token = authHeader[prefix.Length..].Trim();
        if (string.IsNullOrEmpty(token)) return null;
        var hash = tokens.Hash(token);
        var device = await db.Devices.Include(d => d.Config)
            .FirstOrDefaultAsync(d => d.TokenHash == hash && !d.IsRevoked, ct);
        return device;
    }
}