var http = require('http');
var url = require('url');
var math = require('mathjs');
var xml = require('xml');
var xml2js = require('xml2js').parseString;
var strftime = require('strftime');
var xor = require('base64-xor');
var request = require('request');

var config;
var callbackReport;

var max_retry = 2;
var sleep_before_retry = 2000;

var trx_balances = {};
var trx_prices = {};

function calculateSignature(password, msisdn, timestamp) {
    var a = timestamp + msisdn.substr(msisdn.length - 4);
    var b = msisdn.substr(msisdn.length - 4).split('').reverse().join('') + password;
    
    return xor.encode(a,b);
}

function createPayload(task) {
    var timestamp = strftime('%H%M%S');
    
    var payload = {
        pulsamatic: [
            {command: 'TOPUP'},
            {vtype: task['remoteProduct']},
            {userid: config.h2h_out.userid},
            {time: timestamp},
            {msisdn: task['destination']},
            {trxid: task['requestId']},
            {sign: calculateSignature(config.h2h_out.password, task['destination'], timestamp)}
        ]
    };
    
    console.log(payload);
    return "<?xml version=\"1.0\" ?>\n" + xml(payload);
}

function topupRequest(task, retry) {
    
    console.log('Requesting to partner:');
    var payload_xml = createPayload(task);    
    var partner = url.parse(config.h2h_out.partner);
    
    var request_options = {
        host: partner.hostname,
        path: partner.path,
        port: partner.port,
        method: "POST",
        headers: {
            'Content-Type': 'text/xml',
            'Content-Length': Buffer.byteLength(payload_xml)
        }
    };
    
    var buffer = "";
    var req = http.request(request_options, function( res )    {

        console.log('Status code: ' + res.statusCode );
        var buffer = "";
        res.on( "data", function( data ) { buffer = buffer + data; } );
        res.on( "end", function( data ) {             
            directResponseHandler(buffer, task['requestId']);
        });

    });

    req.on('error', function(e) {
        console.log('problem with request: ' + e.message);
        callbackReport(task['requestId'], '40', e.message);
    });

    req.write( payload_xml );
    req.end();
}

function directResponseHandler(body, request_id) {
    console.log('Direct Response:');
    xml2js(body, function (err, result) {
        if (err) {
            console.log(body);
            callbackReport(request_id, '40', buffer);
            return;
        }
        console.log(result);
        
        var response_code = '68';
        
        var request_id = result.pulsamatic.partner_trxid[0].trim();
        var message = result.pulsamatic.message[0].trim();
        var status = result.pulsamatic.result[0].trim();
        
        if (status === 'failed') {
            response_code = '40';
            
            var new_response_code = responseCodeFromMessage(message);
            if (new_response_code) {
                response_code = new_response_code;
            }

        }
        
        callbackReport(request_id, response_code, message);
    });
}

function responseCodeFromMessage(message) {
    if (message.indexOf('Jenis produk tidak cocok') >= 0) {
        return '14';
    } else if (message.indexOf('GAGAL. Nomor telp salah.') >= 0) {
        return '14';
    } else if (message.indexOf('GAGAL. MSISDN tidak ditemukan') >= 0) {
        return '14';
    } 
    return;
}

function createServer() {

    var httpServer = http.createServer(function(req, res) {
        //console.log('Got request from partner ("' + req.url + '")');
        
        res.end('OK');
        
        console.log('Reverse Report:');
        var qs = url.parse(req.url, true).query;
        console.log(qs);
        
        var response_code = '68';
        var request_id = qs.pid;
        var message = qs.msg;
        
        if (qs.code == 2) {
            // gagal
            response_code = '40';
        } else if (qs.code == 3) {
            // refund
            response_code = '40';
        } else if (qs.code == 4) {
            response_code = '00';
            message = 'SN=' + qs.sn + ';' + message;
        }
        
        if (response_code == '40') {
            var new_response_code = responseCodeFromMessage(message);
            if (new_response_code) {
                response_code = new_response_code;
            }
        }
        
        callbackReport(request_id, response_code, message);
    });
    
    httpServer.listen(config.h2h_out.listen_port, function() {
        console.log('HTTP Reverse/Report server listen on port ' + config.h2h_out.listen_port);
    });
}

function start(_config, _callbackReport) {
    config = _config;
    callbackReport = _callbackReport

    createServer();
}

exports.start = start;
exports.topupRequest = topupRequest;
exports.calculateSignature = calculateSignature;