using System.Collections.Generic;

namespace Wayne.Lib.Log
{
    internal class EventLogStorage
    {
        #region Fields

        private Dictionary<LogConfigEventLogStorageType, ISubscriptionStorage> storageDict = new Dictionary<LogConfigEventLogStorageType, ISubscriptionStorage>();

        #endregion

        #region Construction

        public EventLogStorage()
        {
            storageDict[LogConfigEventLogStorageType.Volatile] = new VolatileStorage();
            storageDict[LogConfigEventLogStorageType.NoStorage] = new NoStorage();
            storageDict[LogConfigEventLogStorageType.RestartSafe] = new FileSystemStorage();
        }

        #endregion

        #region Methods

        internal void Add(string subscriberId, EventLogEntry logEntry, LogConfigEventLogStorageType storageType)
        {
            storageDict[storageType].Add(subscriberId, logEntry);
        }

        internal EventLogEntry[] GetPendingEvents(string eventSubscriberId)
        {
            List<EventLogEntry> entries = new List<EventLogEntry>();
            foreach (ISubscriptionStorage storage in storageDict.Values)
                entries.AddRange(storage.GetStoredEvents(eventSubscriberId));
            return entries.ToArray();
        }

        internal void Remove(IEventSubscriber eventSubscriber, EventLogEntry eventLogEntry)
        {
            foreach (ISubscriptionStorage storage in storageDict.Values)
                storage.Remove(eventSubscriber.SubscriberId, eventLogEntry);
        }

        #endregion
    }
}