const express = require('express');
const bodyParser = require('body-parser');
const ipfilter = require('express-ipfilter').IpFilter;
const removeAccents = require('remove-accents');

const config = require('komodo-sdk/config');
const logger = require('tektrans-logger');

const commandHandler = require('./command-handler');
const messagesArchive = require('./messages-archive');

const app = express();
const port = config && config.listener && config.listener.http && config.listener.http.port ? config.listener.http.port : 32979;

/**
 * Handler utama.
 *
 * @param  {object} req - Express request object
 * @param  {object} req.query - Express query string object
 * @param  {string} [req.query.partner] - Partner (pengirim atau penerima)
 * @param  {string} [req.query.from] - Pengirim, OBSOLETED: gunakan parameter partner
 * @param  {string} [req.query.from_raw] - Pengirim tanpa suffix (raw), OBSOLETED: gunakan parameter partner_raw
 * @param  {string} [req.query.to] - Tujuan, jika is_outgoing, OBSOLETED: gunakan parameter partner
 * @param  {string} req.query.msg - Isi pesan
 * @param  {string} req.query.origin - Nama origin
 * @param  {string} [req.query.origin_label] - Nama origin untuk ditulis di histori pesan
 * @param  {string} [req.query.do_not_forward_to_core] - Apakah teruskan pesan ke CORE
 * @param  {string} [req.query.is_outgoing] - Apakah pesan keluar
 * @param  {object} res - Express response object
 */
function mainHandler(req, res) {
    if (!req.body) req.body = {};

    if (
        ( !req.body.partner && !req.query.partner )
        &&
        (
            ( (!req.query.is_outgoing && !req.body.is_outgoing) && (!req.query.from && !req.body.from) )
            || 
            ( (req.query.is_outgoing || req.body.is_outgoing) && (!req.query.to && !req.body.to) )
        )
    ) {
        logger.warn('Undefined parameter partner or from or to. #D254B7B454DB', {
            partner: req.body.partner || req.query.partner,
            is_outgoing: req.body.is_outgoing || req.query.is_outgoing,
            from: req.body.from || req.query.from,
            to: req.body.to || req.query.to,
        });
        res.end('ERROR. Undefined parameter: partner or from or to');
        return;
    }

    // message cleansing
    const msg = removeAccents(req.query.msg || req.body.msg || '')
        .replace(/[\u{0080}-\u{FFFF}]/gu, '').trim();

    if (!msg) {
        logger.warn('Undefined parameter msg. #92996A497D12')
        res.end('ERROR. Undefined parameter: msg');
        return;
    }

    logger.verbose(
        `Saving ${req.body.is_outgoing || req.query.is_outgoing ? 'outgoing' : 'incoming' } message history`,
        {
            transport: req.body.origin_transport || req.query.origin_transport,
            partner: req.body.partner || req.query.partner || req.body.from || req.query.from || req.body.to || req.query.to,
            msg,
        }
    );

    messagesArchive.insert(
        {
            origin_label: req.body.origin_label || req.query.origin_label || req.body.origin || req.query.origin,
            origin_transport: req.body.origin_transport || req.query.origin_transport,
            partner: req.body.partner_raw || req.query.partner_raw || req.body.from_raw || req.query.from_raw || req.body.from || req.query.from || req.body.to || req.query.to || req.body.partner || req.query.partner,
            msg,
        }, 
        ( req.body.is_outgoing || req.query.is_outgoing ) ? messagesArchive.DIRECTION_OUTGOING : messagesArchive.DIRECTION_INCOMING
    );

    if (
        req.body.do_not_forward_to_core || req.query.do_not_forward_to_core 
        || req.body.is_outgoing || req.query.is_outgoing
    ) {
        logger.verbose( 'Ignoring message', { 
                from: req.body.from || req.query.from, 
                msg,
                do_not_forward_to_core: req.body.do_not_forward_to_core || req.query.do_not_forward_to_core 
        });

        res.end('OK');
        return;
    }

    if (!req.query.report_port && !req.body.report_port) {
        res.end('ERROR. Undefined parameter: report_port');
        return;
    }

    const params = {
        origin: req.body.origin || req.query.origin || 'MESSAGING',
        origin_transport: req.body.origin_transport || req.query.origin_transport,
        report_ip: req.body.report_ip || req.query.report_ip || req.ip,
        report_port: req.body.report_port || req.query.report_port,
        from: req.body.partner || req.query.partner || req.body.from || req.query.from,
        msg,
    }

    commandHandler(msg, params, function(err, coreResponseObject, responseParams) {
        if (err) {
            res.end('ERROR. ' + err);
        } else if (coreResponseObject) {
            res.json(coreResponseObject);
        } else {
            res.end(responseParams.body);
        }
    })
}

config.ip_whitelist && config.ip_whitelist.length && app.use(ipfilter(config.ip_whitelist, {mode: 'allow', log: false}));

app.get('/', mainHandler);
app.post('/', bodyParser.urlencoded({extended: true}), mainHandler);

app.listen(port, function() {
    logger.info('HTTP-LISTENER: started', {port: port, app_env: app.get('env')});
});