/*
* Copyright (c) 2022 Vaughn Nugent
* 
* Library: VNLib
* Package: VNLib.Plugins.Extensions.Data
* File: ProtectedDbStore.cs 
*
* ProtectedDbStore.cs is part of VNLib.Plugins.Extensions.Data which is part of the larger 
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.Data is free software: you can redistribute it and/or modify 
* it under the terms of the GNU Affero General Public License as 
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Extensions.Data is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program.  If not, see https://www.gnu.org/licenses/.
*/

using System;
using System.Linq;

using VNLib.Plugins.Extensions.Data.Abstractions;

namespace VNLib.Plugins.Extensions.Data
{
#nullable enable
    /// <summary>
    /// A data store that provides unique identities and protections based on an entity that has an owner <see cref="IUserEntity"/>
    /// </summary>
    public abstract class ProtectedDbStore<TEntity> : DbStore<TEntity> where TEntity : class, IDbModel, IUserEntity
    {
        ///<inheritdoc/>
        protected override IQueryable<TEntity> GetCollectionQueryBuilder(TransactionalDbContext context, params string[] constraints)
        {
            string userId = constraints[0];
            //Query items for the user and its id
            return from item in context.Set<TEntity>()
                   where item.UserId == userId
                   orderby item.Created descending
                   select item;
        }

        /// <summary>
        /// Gets a single item contrained by a given user-id and item id
        /// </summary>
        /// <param name="context"></param>
        /// <param name="constraints"></param>
        /// <returns></returns>
        protected override IQueryable<TEntity> GetSingleQueryBuilder(TransactionalDbContext context, params string[] constraints)
        {
            string key = constraints[0];
            string userId = constraints[1];
            //Query items for the user and its id
            return from item in context.Set<TEntity>()
                   where item.Id == key && item.UserId == userId
                   select item;
        }
        ///<inheritdoc/>
        protected override IQueryable<TEntity> GetSingleQueryBuilder(TransactionalDbContext context, TEntity record)
        {
            return this.GetSingleQueryBuilder(context, record.Id, record.UserId);
        }
    }
}