var redis = require('redis');
var winston = require('winston');
var hashlib = require('hashlib');

var RedisDocumentStore = function(options) {
  if (!RedisDocumentStore.client) {
    RedisDocumentStore.connect(options);
  }
};

// Create a connection according to config
RedisDocumentStore.connect = function(options) {
  var host = options.host || '127.0.0.1';
  var port = options.port || 6379;
  var index = options.db || 0;
  RedisDocumentStore.client = redis.createClient(port, host);
  RedisDocumentStore.client.select(index, function(err, reply) {
    if (err) {
      winston.error('error connecting to redis index ' + index, { error: error.message });
      process.exit(1);
    }
    else {
      winston.info('connected to redis on ' + host + ':' + port + '/' + index);
    }
  });
};

// Save file in a key
RedisDocumentStore.prototype.set = function(key, data, callback) {
  RedisDocumentStore.client.set(key, data, function(err, reply) {
    callback(!err);
  });
};

// Get a file from a key
RedisDocumentStore.prototype.get = function(key, callback) {
  RedisDocumentStore.client.get(key, function(err, reply) {
    callback(err ? false : reply);
  }); 
};

module.exports = RedisDocumentStore;