using DataLayer;
using LibationFileManager;
using Microsoft.EntityFrameworkCore;
using System.Collections.Generic;

namespace ApplicationServices
{
    public static class DbContexts
    {
        /// <summary>Use for fully functional context, incl. SaveChanges(). For query-only, use the other method</summary>
        public static LibationContext GetContext()
            => InstanceQueue<LibationContext>.WaitToCreateInstance(() =>
            {
                var context = !string.IsNullOrEmpty(Configuration.Instance.PostgresqlConnectionString)
                    ? LibationContextFactory.CreatePostgres(Configuration.Instance.PostgresqlConnectionString)
                    : LibationContextFactory.CreateSqlite(SqliteStorage.ConnectionString);
                context.Database.Migrate();
                return context;
            });

        /// <summary>Use for full library querying. No lazy loading</summary>
        public static List<LibraryBook> GetLibrary_Flat_NoTracking(bool includeParents = false)
        {
            using var context = GetContext();
            return context.GetLibrary_Flat_NoTracking(includeParents);
        }
    }
}