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;

function calculateSignature(userid, password, msisdn, timestamp) {
    var a = msisdn.substr(msisdn.length - 4) + timestamp;
    var b = userid.substr(0, 4) + password;
    
    return xor.encode(a,b);
}

function calculateBalanceSignature(userid, password, timestamp) {
    var a = '0000' + timestamp;
    var b = userid.substr(0, 4) + password;
    
    return xor.encode(a,b);
}


function createPayload(task) {
    var timestamp = strftime('%H%M%S');
    
    var payload = {
        datacell: [
            { perintah: 'charge'},
            {oprcode: task['remoteProduct']},
            {userid: config.h2h_out.userid},
            {time: timestamp},
            {msisdn: task['destination']},
            {ref_trxid: task['requestId']},
            {sgn: calculateSignature(config.h2h_out.userid, config.h2h_out.password, task['destination'], timestamp)}
        ]
    };
    
    console.log(payload);
    return "<?xml version=\"1.0\" ?>\n" + xml(payload);
}

function topupRequest(task, retry) {
    balanceCheck();
    
    var payload_xml = createPayload(task);
    //console.log(payload_xml);
    
    var postRequest = {
        host: "202.152.62.2",
        path: "/RELOAD97.php",
        port: 7713,
        method: "POST",
        headers: {
            'Content-Type': 'text/xml',
            'Content-Length': Buffer.byteLength(payload_xml)
        }
    };
    
    var buffer = "";
    var req = http.request( postRequest, function( res )    {

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

    });

    req.on('error', function(e) {
        console.log('problem with request: ' + e.message);
    });

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

function topupResponseHandler(body, request_id) {
    xml2js(body, function (err, result) {
        if (err) {
            console.log(body);
            callbackReport(request_id, '40', buffer);
            return;
        }
        
        console.log(result);
        
        request_id = result.datacell.ref_trxid[0].trim();
        
        var response_code = '68';
        
        var message = '';
        try {
            if (result.datacell.message && result.datacell.message.length > 0) {
                message = result.datacell.message[0].trim();
            } else if (result.datacell.msg && result.datacell.msg.length > 0) {
                message = result.datacell.msg[0].trim();
            } 
        }
        catch(err) {
            message = 'exception saat parsing message';
        }
        
        if (result.datacell.resultcode && result.datacell.resultcode[0] == '999') {
            response_code = '40';
        }
        
        if (message.indexOf('Nomor tujuan salah') >= 0) {
            response_code = '14';
        } else if (message.indexOf('*GAGAL, transaksi yang sama sudah ada dalam 10 menit') >= 0) {
            response_code = '55';
        } else if (message.indexOf('saldo sdh dikembalikan') >= 0) {
            response_code = '40'
        } else if (message.indexOf('Trx dpt diulang') >= 0) {
            response_code = '40'
        } else if (message.indexOf('SUKSES SN Operator:') >= 0) {
            response_code = '00';
            
            var sn = parseSN(message);
            console.log ('SN Operator: ' + sn);
            
            /*
            if (!sn) {
                
                console.log('Missing real operator SN, using SN from suplier');
                try {
                    sn = result.datacell.trxid[0].trim();
                }
                catch(err) {
                    sn = '';
                }
            }
            */
            
            if (sn) {
                message = 'SN=' + sn + '; ' + message;
            } else {
                message = message + ' - ' + ' Unknown original SN';
            }
        }
        
        callbackReport(request_id, response_code, message);
    });
}

function parseSN(message) {
    var results = message.match(/SN Operator: .+ SN Kami/);
    if (!results || results.length <= 0) {
        return '';
    }
    
    var result = results[0];
    result = result.replace('SN Operator:', '');
    result = result.replace('SN Kami', '');
    result = result.trim();
    
    if (result == '00') {
        result = '';
    }
    
    return result;
}

function createServer() {

    var httpServer = http.createServer(function(req, res) {
        console.log('Got request from partner ("' + req.url + '")');
        
        var body = "";
        req.on('data', function (chunk) {
            body += chunk;
        });
        
        req.on('end', function () {
            res.writeHead(200);
            res.end('OK');
            
            console.log(body);
            
            if (req.url == '/sn') {
                topupResponseHandler(body);
            } else {
                console.log('Ignore non /sn report');
            }
        });
    });
    
    httpServer.listen(config.h2h_out.listen_port, function() {
        console.log('HTTP Reverse/Report server listen on port ' + config.h2h_out.listen_port);
    });
}

function balanceCheck() {
    var timestamp = strftime('%H%M%S');
    
    var payload = {
        datacell: [
            {perintah: 'saldo'},
            {userid: config.h2h_out.userid},
            {time: timestamp},
            {sgn: calculateBalanceSignature(config.h2h_out.userid, config.h2h_out.password, timestamp)}
        ]
    };
    
    var postRequest = {
        host: "202.152.62.2",
        path: "/RELOAD97.php",
        port: 7713,
        method: "POST",
        headers: {
            'Content-Type': 'text/xml',
            'Content-Length': Buffer.byteLength(payload_xml)
        }
    };
    
    var buffer = "";
    var req = http.request( postRequest, function( res )    {

        console.log('Status code: ' + res.statusCode );
        var buffer = "";
        res.on( "data", function( data ) { buffer = buffer + data; } );
        res.on( "end", function( data ) {             
            console.log('CHECK BALANCE RESULT:');
            console.log(buffer);
        });

    });

    req.on('error', function(e) {
        console.log('problem with request: ' + e.message);
    });

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


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

    createServer();
}

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