'use strict'

var hiredis = require('hiredis')
var ReplyError = require('../lib/replyError')
var ParserError = require('../lib/parserError')

/**
 * Parse data
 * @param parser
 * @returns {*}
 */
function parseData (parser, data) {
  try {
    return parser.reader.get()
  } catch (err) {
    // Protocol errors land here
    // Reset the parser. Otherwise new commands can't be processed properly
    parser.reader = new hiredis.Reader(parser.options)
    parser.returnFatalError(new ParserError(err.message, JSON.stringify(data), -1))
  }
}

/**
 * Hiredis Parser
 * @param options
 * @constructor
 */
function HiredisReplyParser (options) {
  this.returnError = options.returnError
  this.returnFatalError = options.returnFatalError || options.returnError
  this.returnReply = options.returnReply
  this.name = 'hiredis'
  this.options = {
    return_buffers: !!options.returnBuffers
  }
  this.reader = new hiredis.Reader(this.options)
}

HiredisReplyParser.prototype.execute = function (data) {
  this.reader.feed(data)
  var reply = parseData(this, data)

  while (reply !== undefined) {
    if (reply && reply.name === 'Error') {
      this.returnError(new ReplyError(reply.message))
    } else {
      this.returnReply(reply)
    }
    reply = parseData(this, data)
  }
}

/**
 * Reset the parser values to the initial state
 *
 * @returns {undefined}
 */
HiredisReplyParser.prototype.reset = function () {
  this.reader = new hiredis.Reader(this.options)
}

module.exports = HiredisReplyParser