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

getAliasForChannel = (channel) => {
  let pubkey = (channel.remote_pubkey) ? channel.remote_pubkey : (channel.remote_node_pub) ? channel.remote_node_pub : '';
  options.url = common.getSelLNServerUrl() + '/v1/graph/node/' + pubkey;
  return request(options).then(function(aliasBody) {
    logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'Alias', data: aliasBody.node.alias});
    channel.remote_alias = aliasBody.node.alias;
    return aliasBody.node.alias;
  })
  .catch(err => {
    channel.remote_alias = pubkey.slice(0, 10) + '...' + pubkey.slice(-10);
    return pubkey;
  });
}

exports.getAllChannels = (req, res, next) => {
  logger.log({level: 'INFO', fileName: 'Channels', msg: 'Getting Channels..'});
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/v1/channels';
  options.qs = req.query;
  let local = 0;
  let remote = 0;
  let total = 0;
  request(options).then(function (body) {
    logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'All Channels Received', data: body});
    if (body.channels) {
      return Promise.all(
        body.channels.map(channel => {
          local = (channel.local_balance) ? +channel.local_balance : 0;
          remote = (channel.remote_balance) ? +channel.remote_balance : 0;
          total = local + remote;
          channel.balancedness = (total == 0) ? 1 : (1 - Math.abs((local-remote)/total)).toFixed(3);
          return getAliasForChannel(channel);
        })
      )
      .then(function(values) {
        body.channels = common.sortDescByKey(body.channels, 'balancedness');
        logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'All Channels with Alias', data: body});
        logger.log({level: 'INFO', fileName: 'Channels', msg: 'Channels Received'});
        res.status(200).json(body);
      })
      .catch(errRes => {
        const err = common.handleError(errRes,  'Channels', 'Get All Channel Aliases Error');
        return res.status(err.statusCode).json({message: err.message, error: err.error});
      });
    } else {
      body.channels = [];
      logger.log({level: 'INFO', fileName: 'Channels', msg: 'Empty Channels Received'});
      res.status(200).json(body);
    }
  })
  .catch(errRes => {
    const err = common.handleError(errRes,  'Channels', 'List Channels Error');
    return res.status(err.statusCode).json({message: err.message, error: err.error});
  });
};

exports.getPendingChannels = (req, res, next) => {
  logger.log({level: 'INFO', fileName: 'Channels', msg: 'Getting Pending Channels..'});
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/v1/channels/pending';
  options.qs = req.query;
  request(options).then(function (body) {
    if (!body.total_limbo_balance) {
      body.total_limbo_balance = 0;
    }
    const promises = [];
    if (body.pending_open_channels && body.pending_open_channels.length > 0) {
      body.pending_open_channels.map(channel => { return promises.push(getAliasForChannel(channel.channel))});
    }
    if (body.pending_closing_channels && body.pending_closing_channels.length > 0) {
      body.pending_closing_channels.map(channel => { return promises.push(getAliasForChannel(channel.channel))});
    }
    if (body.pending_force_closing_channels && body.pending_force_closing_channels.length > 0) {
      body.pending_force_closing_channels.map(channel => { return promises.push(getAliasForChannel(channel.channel))});
    }
    if (body.waiting_close_channels && body.waiting_close_channels.length > 0) {
      body.waiting_close_channels.map(channel => { return promises.push(getAliasForChannel(channel.channel))});
    }
    return Promise.all(promises).then(function(values) {
      logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'Pending Channels', data: body});
      logger.log({level: 'INFO', fileName: 'Channels', msg: 'Pending Channels Received'});
      res.status(200).json(body);
    })
    .catch(errRes => {
      const err = common.handleError(errRes,  'Channels', 'Get Pending Channel Aliases Error');
      return res.status(err.statusCode).json({message: err.message, error: err.error});
    });      
  })
  .catch(errRes => {
    const err = common.handleError(errRes,  'Channels', 'List Pending Channels Error');
    return res.status(err.statusCode).json({message: err.message, error: err.error});
  });
};

exports.getClosedChannels = (req, res, next) => {
  logger.log({level: 'INFO', fileName: 'Channels', msg: 'Getting Closed Channels..'});
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/v1/channels/closed';
  options.qs = req.query;
  request(options).then(function (body) {
    if (body.channels && body.channels.length > 0) {
      return Promise.all(
        body.channels.map(channel => {
          channel.close_type = (!channel.close_type) ? 'COOPERATIVE_CLOSE' : channel.close_type;
          return getAliasForChannel(channel);
        })
      )
      .then(function(values) {
        body.channels = common.sortDescByKey(body.channels, 'close_height');
        logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'Closed Channels', data: body});
        logger.log({level: 'INFO', fileName: 'Channels', msg: 'Closed Channels Received'});
        res.status(200).json(body);
      })
      .catch(errRes => {
        const err = common.handleError(errRes,  'Channels', 'Get Closed Channel Aliases Error');
        return res.status(err.statusCode).json({message: err.message, error: err.error});
      });
    } else {
      body.channels = [];
      res.status(200).json(body);
    }    
  })
  .catch(errRes => {
    const err = common.handleError(errRes,  'Channels', 'List Closed Channels Error');
    return res.status(err.statusCode).json({message: err.message, error: err.error});
  });
};

exports.postChannel = (req, res, next) => {
  logger.log({level: 'INFO', fileName: 'Channels', msg: 'Opening Channel..'});
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/v1/channels';
  options.form = { 
    node_pubkey_string: req.body.node_pubkey,
    local_funding_amount: req.body.local_funding_amount,
    private: req.body.private,
    spend_unconfirmed: req.body.spend_unconfirmed
  };
  if (req.body.trans_type === '1') {
    options.form.target_conf = req.body.trans_type_value;
  } else if (req.body.trans_type === '2') {
    options.form.sat_per_byte = req.body.trans_type_value;
  }
  options.form = JSON.stringify(options.form);
  request.post(options).then((body) => {
    logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'Channel Open Response', data: body});
    logger.log({level: 'INFO', fileName: 'Channels', msg: 'Channels Opened'});
    res.status(201).json(body);
  })
  .catch(errRes => {
    const err = common.handleError(errRes,  'Channels', 'Open Channel Error');
    return res.status(err.statusCode).json({message: err.message, error: err.error});
  });
};

exports.postTransactions = (req, res, next) => {
  logger.log({level: 'INFO', fileName: 'Channels', msg: 'Sending Payment..'});
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/v1/channels/transactions';
  options.form = { payment_request: req.body.paymentReq };
  if (req.body.paymentAmount) {
    options.form.amt = req.body.paymentAmount;
  }
  if (req.body.feeLimit) { options.form.fee_limit = req.body.feeLimit; }
  if (req.body.outgoingChannel) { options.form.outgoing_chan_id = req.body.outgoingChannel; }
  if (req.body.allowSelfPayment) { options.form.allow_self_payment = req.body.allowSelfPayment; }
  if (req.body.lastHopPubkey) { options.form.last_hop_pubkey = Buffer.from(req.body.lastHopPubkey, 'hex').toString('base64'); }
  options.form = JSON.stringify(options.form);
  logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'Send Payment Options', data: options.form});
  request.post(options).then((body) => {
    logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'Send Payment Response', data: body});
    if (body.payment_error) {
      const err = common.handleError(body.payment_error,  'Channels', 'Send Payment Error');
      return res.status(err.statusCode).json({message: err.message, error: err.error});
    } else {
      logger.log({level: 'INFO', fileName: 'Channels', msg: 'Payment Sent'});
      res.status(201).json(body);
    }
  })
  .catch(errRes => {
    const err = common.handleError(errRes,  'Channels', 'Send Payment Error');
    return res.status(err.statusCode).json({message: err.message, error: err.error});
  });
};

exports.closeChannel = (req, res, next) => {
  try {
    logger.log({level: 'INFO', fileName: 'Channels', msg: 'Closing Channel..'});
    options = common.getOptions();
    let channelpoint = req.params.channelPoint.replace(':', '/');
    options.url = common.getSelLNServerUrl() + '/v1/channels/' + channelpoint + '?force=' + req.query.force;
    if (req.query.target_conf) { options.url = options.url + '&target_conf=' + req.query.target_conf; }
    if (req.query.sat_per_byte) { options.url = options.url + '&sat_per_byte=' + req.query.sat_per_byte; }
    logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'Closing Channel Options URL', data: options.url});
    request.delete(options);
    res.status(202).json({message: 'Close channel request has been submitted.'});
  } catch (error) {
    logger.log({level: 'ERROR', fileName: 'Channels', msg: 'Close Channel Error', error: error.message}); 
    return res.status(500).json({message: 'Close Channel Error', error: error.message});
  }
}

exports.postChanPolicy = (req, res, next) => {
  logger.log({level: 'INFO', fileName: 'Channels', msg: 'Updating Channel Policy..'});
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/v1/chanpolicy';
  if (req.body.chanPoint === 'all') {
    options.form = JSON.stringify({
      global: true, 
      base_fee_msat: req.body.baseFeeMsat,
      fee_rate: parseFloat(req.body.feeRate/1000000),
      time_lock_delta: parseInt(req.body.timeLockDelta)
    });
  } else {
    let breakPoint = req.body.chanPoint.indexOf(':');
    let txid_str = req.body.chanPoint.substring(0, breakPoint);
    let output_idx = req.body.chanPoint.substring(breakPoint+1, req.body.chanPoint.length);
    options.form = JSON.stringify({ 
      base_fee_msat: req.body.baseFeeMsat,
      fee_rate: parseFloat(req.body.feeRate/1000000),
      time_lock_delta: parseInt(req.body.timeLockDelta),
      chan_point: {funding_txid_str: txid_str, output_index: parseInt(output_idx)}
    });
  }
  logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'Update Channel Policy Options', data: options.form});
  request.post(options).then((body) => {
    logger.log({level: 'DEBUG', fileName: 'Channels', msg: 'Update Channel Policy', data: body});
    logger.log({level: 'INFO', fileName: 'Channels', msg: 'Channel Policy Updated'});
    res.status(201).json(body);
  })
  .catch(errRes => {
    const err = common.handleError(errRes,  'Channels', 'Update Channel Policy Error');
    return res.status(err.statusCode).json({message: err.message, error: err.error});
  });
};