var winston = require('winston');
  var soap = require('soap');

  var crypto = require('crypto');
  var strftime = require('strftime');

  var fs = require("fs");
  var whiskers = require("whiskers");
  var http = require("http");
  
  process.chdir(__dirname);
  var soapTemplate = fs.readFileSync("message.xml");

  
  var max_retry = 10;
  var sleep_before_retry = 5000;
  
  var config;
  var callbackReport;
  var aaa;
  var logger;
  var options;
  
  function start(_config, _callbackReport, options) {
      config = _config;
      callbackReport = _callbackReport
  
      if (options && options.aaa) {
              aaa = options.aaa;
      }
  
      if (options && options.logger) {
          logger = options.logger;
      } else {
          logger = new winston.Logger({
              transports: [
                new (winston.transports.Console)()
              ]
          });
      }
  }
  
  function topupRequest(task, retry) {
      if (retry === undefined) {
          retry = max_retry;
      }

      var remoteProduct = task.remoteProduct.split(',');

      var params = {

          userName: config.h2h_out.userid,
          productCode: remoteProduct[0] ,
          terminal: 'terminal0',
          transactionType: '50',
          billNumber: createBillNumber(task.destination),
          amount: remoteProduct[1],
          bit61: createBillNumber(task.destination),
          reff: task.requestId,

          timeStamp: strftime('%d-%m-%Y %H:%M:%S', new Date())

      }

      var signature = createSignature(params, config.h2h_out.password);
      params.signature = signature;

      topupRequestSoapDIY(task, params, retry);

  }

  function topupRequestSoap(task, params, retry) {

      soap.createClient(config.h2h_out.partner, function(err, soapClient) {

          var _params = {
              userName: params.userName,
              signature: params.signature,
              productCode: params.productCode,
              terminal: params.terminal,
              transactionType: params.transactionType,
              billNumber: params.billNumber,
              amount: params.amount,
              bit61: params.bit61,
              reff: params.reff,
              timeStamp: params.timeStamp
          }
  
          logger.info('Requesting to service', {url: config.h2h_out.partner, params: _params});
  
          soapClient.apih2h.apih2hPort.billpayment({ inputCheck: _params }, function(err, result) {

  
              logger.info('Got response', {lastRequest: soapClient.lastRequest});

              if (err) {
                  logger.warn('Error requesting service', {err: err});
                  callbackReport(task.requestId, '68', 'something wrong');
                  return;
              }

              var responseMessageToST24 = result.outputParameter.resultCode.$value + ' - ' + result.outputParameter.resultDesc.$value;
  
              logger.info('Got result: ' + responseMessageToST24, {result: result});
  
              callbackReport(task.requestId, '68', responseMessageToST24);

          });
      });
  }

  function topupRequestSoapDIY(task, params, retry) {
      var message = whiskers.render(soapTemplate, params);
      logger.verbose("Generating SOAP message", {message: message});
  
      var partnerUrl = url.parse(config.h2h_out.partner);
      var postRequest = {
          host: partnerUrl.hostname,
          path: partnerUrl.path,
          port: partnerUrl.port,
          method: "POST",
          headers: {
              'Content-Type': 'application/soap',
              'Content-Length': Buffer.byteLength(message)
          }
      };
  
      logger.info('POST to partner', {postRequest: postRequest});
      var req = http.request(postRequest, function( res ) {
  
          logger.verbose('Request status code: ' + res.statusCode );
          var buffer = "";
  
          res.on( "data", function( data ) {
              buffer = buffer + data;
          });
  
          res.on( "end", function( data ) {
              topupResponseHandler(buffer, task);
          });
  
      });
  
      req.on('error', function(e) {
          logger.warn('problem with request: ' + e.message);
          callbackReport(task.requestId, '68', e.message);
  
          topupRequestRetry(task);
      });
  
      req.write(message);
      req.end();
  }
  
  function topupResponseHandler(response, task) {
      logger.verbose('Got response', {response: response, task: task});
      callbackReport(task.requestId, '68', 'Got response');
  }
  
  function topupRequestRetry(task) {
      task.retry--;
  
      if (task.retry > 0) {
          logger.info('Retrying in ' +  sleepBeforeRetry + 's');
          setTimeout(topupRequest, sleepBeforeRetry * 1000, task, task.retry);
      }
      else {
          logger.warn('Maximum retry for pending status exceeded', {task: task});
      }
  }

  function createSignature(params, password) {

      var passwordHash = crypto.createHash('sha256').update(password).digest().toString('hex');

      var plain =

          params.userName

          + passwordHash

          + params.productCode
          + params.terminal
          + params.transactionType
          + params.billNumber
          + params.amount
          + params.reff
          + params.timeStamp;

  
      var result = crypto.createHash('sha1').update(plain).digest().toString('hex');

      if (logger) {

          logger.verbose('Calculating signature', {plain: plain, result: result, params: params, password: password});

      }

      return result;
  }
  
  function createBillNumber(destination) {
      return ("0000000000000" + destination).slice(-13);

  }
  
  exports.start = start;
  exports.topupRequest = topupRequest;

  exports.createSignature = createSignature;
  exports.createBillNumber = createBillNumber;