using System;
using System.Runtime.Caching;
using System.Linq;
using System.Collections.Generic;

namespace C4IT.API
{
    class ApiCache
    {
        public static object GetValue(string key)
        {
            MemoryCache memoryCache = MemoryCache.Default;

            return memoryCache.Get(key);
        }

        public static object AddOrGet(string key, object value, DateTimeOffset absExpiration)
        {
            MemoryCache memoryCache = MemoryCache.Default;
            lock (memoryCache)
            {
                return memoryCache.AddOrGetExisting(key, value, absExpiration);
            }
        }

        public static bool Add(string key, object value, DateTimeOffset absExpiration)
        {
            
            MemoryCache memoryCache = MemoryCache.Default;
            lock (memoryCache)
            {
                return memoryCache.Add(key, value, absExpiration);
            }
            
        }

        public static void Delete(string key)
        {
            MemoryCache memoryCache = MemoryCache.Default;
            if (memoryCache.Contains(key))
            {
                memoryCache.Remove(key);
            }
        }

        public static List<String> GetAllKeysInCache()
        {
            MemoryCache memoryCache = MemoryCache.Default;
            List<String> cacheKeys = new List<String>();
            var keys= memoryCache.Where(o => true).Select(o => o.Key);
            
            foreach (var key in keys)
            {
                cacheKeys.Add(key);
            }
            
            return cacheKeys;
        }
    }
}