var request = require('request-promise');
var common = require('../../routes/common');
var logger = require('../shared/logger');
var options = {};

exports.getInvoice = (req, res, next) => {
  logger.log({level: 'INFO', fileName: 'Invoice', msg: 'Getting Invoice Information..'});
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/v1/invoice/' + req.params.rHashStr;
  request(options).then((body) => {
    logger.log({level: 'DEBUG', fileName: 'Invoice', msg: 'Invoice Info Received', data: body});
    logger.log({level: 'INFO', fileName: 'Invoice', msg: 'Invoice Information Received'});
    body.r_preimage = body.r_preimage ? Buffer.from(body.r_preimage, 'base64').toString('hex') : '';
    body.r_hash = body.r_hash ? Buffer.from(body.r_hash, 'base64').toString('hex') : '';
    body.description_hash = body.description_hash ? Buffer.from(body.description_hash, 'base64').toString('hex') : null;
    res.status(200).json(body);
  })
  .catch(errRes => {
    const err = common.handleError(errRes,  'Invoices', 'Get Invoice Error');
    return res.status(err.statusCode).json({message: err.message, error: err.error});
  });  
};

exports.listInvoices = (req, res, next) => {
  logger.log({level: 'INFO', fileName: 'Invoice', msg: 'Getting List Invoices..'});
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/v1/invoices?num_max_invoices=' + req.query.num_max_invoices + '&index_offset=' + req.query.index_offset + 
  '&reversed=' + req.query.reversed;
  request(options).then((body) => {
    logger.log({level: 'DEBUG', fileName: 'Invoice', msg: 'Invoices List Received', data: body});
    if (body.invoices && body.invoices.length > 0) {
      body.invoices.forEach(invoice => {
        invoice.r_preimage = invoice.r_preimage ? Buffer.from(invoice.r_preimage, 'base64').toString('hex') : '';
        invoice.r_hash = invoice.r_hash ? Buffer.from(invoice.r_hash, 'base64').toString('hex') : '';
        invoice.description_hash = invoice.description_hash ? Buffer.from(invoice.description_hash, 'base64').toString('hex') : null;
      });
      body.invoices = common.sortDescByKey(body.invoices, 'creation_date');
    }
    logger.log({level: 'DEBUG', fileName: 'Invoice', msg: 'Invoices List Received', data: body});
    logger.log({level: 'INFO', fileName: 'Invoice', msg: 'Invoices List Received'});
    res.status(200).json(body);
  })
  .catch(errRes => {
    const err = common.handleError(errRes,  'Invoices', 'List Invoices Error');
    return res.status(err.statusCode).json({message: err.message, error: err.error});
  });
};

exports.addInvoice = (req, res, next) => {
  logger.log({level: 'INFO', fileName: 'Invoice', msg: 'Adding Invoice..'});
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/v1/invoices';
  options.form = { 
    memo: req.body.memo,
    private: req.body.private,
    expiry: req.body.expiry
  };
  if (req.body.amount > 0 && req.body.amount < 1) {
    options.form.value_msat = req.body.amount * 1000;
  } else {
    options.form.value = req.body.amount;
  }
  options.form = JSON.stringify(options.form);
  request.post(options).then((body) => {
    logger.log({level: 'DEBUG', fileName: 'Invoice', msg: 'Add Invoice Responce', data: body});
    logger.log({level: 'INFO', fileName: 'Invoice', msg: 'Invoice Added'});
    res.status(201).json(body);
  })
  .catch(errRes => {
    const err = common.handleError(errRes,  'Invoices', 'Add Invoice Error');
    return res.status(err.statusCode).json({message: err.message, error: err.error});
  });
};