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");
var url = require("url");

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;

    topupRequestSoap(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('SOAPAction', soapClient.SOAPAction);

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

            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_endpoint);
    var postRequest = {
        host: partnerUrl.hostname,
        path: partnerUrl.path,
        port: partnerUrl.port,
        method: "POST",
        headers: {
            'Content-Type': 'application/soap+xml',
            'Content-Length': Buffer.byteLength(message),
            'SOAPAction': 'billpayment'
        }
    };

    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;