var Lru = require("lru-cache")

var memory_store = function(args) {
    args = args || {};
    var db = args.db || 'cache';
    var self = {};
    var ttl = args.ttl;
    var lru_opts = {
        max: args.max || 500,
        maxAge: ttl ? ttl * 1000 : null
    };

    var lru_cache = new Lru(lru_opts);

    self.set = function(key, value, cb) {
        lru_cache.set(key, value);
        cb(null);
    };

    self.get = function(key, cb) {
        cb(null, lru_cache.get(key));
    };

    self.del = function(key, cb) {
        lru_cache.del(key);
        cb(null);
    };

    return self;
};

var methods = {
    create: function(args) {
        return memory_store(args);
    }
};

module.exports = methods;