using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace ZB.MOM.WW.OtOpcUa.Configuration;

public static class ServiceCollectionExtensions
{
    public const string ConnectionStringName = "ConfigDb";

    /// <summary>
    /// Registers <see cref="IDbContextFactory{TContext}"/> for <see cref="OtOpcUaConfigDbContext"/>
    /// using the connection string named <c>ConfigDb</c> from <see cref="IConfiguration"/>.
    /// </summary>
    public static IServiceCollection AddOtOpcUaConfigDb(this IServiceCollection services, IConfiguration configuration)
    {
        var connectionString = configuration.GetConnectionString(ConnectionStringName)
            ?? throw new InvalidOperationException(
                $"Connection string '{ConnectionStringName}' is required. Add it to appsettings.json or the OTOPCUA_CONFIG_CONNECTION env var.");

        services.AddDbContextFactory<OtOpcUaConfigDbContext>(opt => opt.UseSqlServer(connectionString));
        return services;
    }
}