using System.Collections.Generic;

namespace ChadSoft.Data
{
    ///<summary>
    /// A base class used as a temporary in-memory data store.
    ///</summary>
    ///<typeparam name="T">Type to store</typeparam>
    public class InMemoryRepository<T> : IRepository<T>
    {
        protected readonly List<T> repositoryData = new List<T>();

        ///<summary>
        /// Get all of the current objects.
        ///</summary>
        ///<returns>All of the current objects.</returns>
        public virtual IEnumerable<T> GetAll()
        {
            return repositoryData;
        }

        ///<summary>
        /// Find the stored objects that meet a particular criteria.
        ///</summary>
        ///<param name="criteria">The criteria used to find stored objects</param>
        ///<returns>Objects that meet the criteria</returns>
        public virtual IEnumerable<T> Find(ICriteria criteria)
        {
            return repositoryData.FindAll(o => criteria.IsMatch(o));
        }

        ///<summary>
        /// Save an object to the repository
        ///</summary>
        ///<param name="obj"></param>
        public virtual void Save(T obj)
        {
            if (repositoryData.Contains(obj))
                repositoryData.Remove(obj);
            repositoryData.Add(obj);
        }
    }
}