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

arrangeChannels = (simplifiedChannels) => {
  let channelTotal = 0;
  let totalLocalBalance = 0;
  let totalRemoteBalance = 0;
  let lightningBalances = { localBalance: 0, remoteBalance: 0 };
  let channelStatus = {active: { channels: 0, capacity: 0 }, inactive: { channels: 0, capacity: 0 }, pending: { channels:  0, capacity: 0 }};
  let activeChannels = [];
  let pendingChannels = [];
  let inactiveChannels = [];
  simplifiedChannels.forEach((channel, i) => {
    if (channel.state === 'NORMAL') {
      channelTotal = channel.toLocal + channel.toRemote;
      totalLocalBalance = totalLocalBalance + channel.toLocal;
      totalRemoteBalance = totalRemoteBalance + channel.toRemote;
      channel.balancedness = (channelTotal == 0) ? 1 : (1 - Math.abs((channel.toLocal-channel.toRemote)/channelTotal)).toFixed(3);
      activeChannels.push(channel);
      channelStatus.active.channels = channelStatus.active.channels + 1;
      channelStatus.active.capacity = channelStatus.active.capacity + channel.toLocal;
    } else if (channel.state.includes('WAIT') || channel.state.includes('CLOSING') || channel.state.includes('SYNCING')) {
      channel.state = channel.state.replace(/_/g, ' ');
      pendingChannels.push(channel);
      channelStatus.pending.channels = channelStatus.pending.channels + 1;
      channelStatus.pending.capacity = channelStatus.pending.capacity + channel.toLocal;
    } else {
      channel.state = channel.state.replace(/_/g, ' ');
      inactiveChannels.push(channel);
      channelStatus.inactive.channels = channelStatus.inactive.channels + 1;
      channelStatus.inactive.capacity = channelStatus.inactive.capacity + channel.toLocal;
    }
  });
  lightningBalances = { localBalance: totalLocalBalance, remoteBalance: totalRemoteBalance };
  activeChannels = common.sortDescByKey(activeChannels, 'balancedness');
  logger.info({fileName: 'Channels', msg: 'Lightning Balances: ' + JSON.stringify(lightningBalances)});
  logger.info({fileName: 'Channels', msg: 'Active Channels: ' + JSON.stringify(activeChannels)});
  logger.info({fileName: 'Channels', msg: 'Pending Channels: ' + JSON.stringify(pendingChannels)});
  logger.info({fileName: 'Channels', msg: 'Inactive Channels: ' + JSON.stringify(inactiveChannels)});
  return ({activeChannels: activeChannels, pendingChannels: pendingChannels, inactiveChannels: inactiveChannels, lightningBalances: lightningBalances, channelStatus: channelStatus});
};

simplifyAllChannels = (channels) => {
  let channelNodeIds = '';
  let simplifiedChannels = [];
  channels.forEach(channel => { 
    channelNodeIds = channelNodeIds + ',' + channel.nodeId; 
    simplifiedChannels.push({
      nodeId: channel.nodeId ? channel.nodeId : '',
      channelId: channel.channelId ? channel.channelId : '',
      state: channel.state ? channel.state : '',
      channelFlags: channel.data && channel.data.commitments && channel.data.commitments.channelFlags ? channel.data.commitments.channelFlags : 0,
      toLocal: (channel.data.commitments.localCommit.spec.toLocal) ? Math.round(+channel.data.commitments.localCommit.spec.toLocal/1000) : 0,
      toRemote: (channel.data.commitments.localCommit.spec.toRemote) ? Math.round(+channel.data.commitments.localCommit.spec.toRemote/1000) : 0,
      shortChannelId: channel.data && channel.data.shortChannelId ? channel.data.shortChannelId : '',
      isFunder: channel.data && channel.data.commitments && channel.data.commitments.localParams && channel.data.commitments.localParams.isFunder ? channel.data.commitments.localParams.isFunder : false,
      buried: channel.data && channel.data.buried ? channel.data.buried : false,
      feeBaseMsat: channel.data && channel.data.channelUpdate && channel.data.channelUpdate.feeBaseMsat ? channel.data.channelUpdate.feeBaseMsat : 0,
      feeProportionalMillionths: channel.data && channel.data.channelUpdate && channel.data.channelUpdate.feeProportionalMillionths ? channel.data.channelUpdate.feeProportionalMillionths : 0,
      alias: ''
    });
  });
  channelNodeIds = channelNodeIds.substring(1);
  return new Promise(function(resolve, reject) {
    options.url = common.getSelLNServerUrl() + '/nodes';
    options.form = { nodeIds: channelNodeIds };
    logger.info({fileName: 'Channels', msg: 'Node Ids to find alias: ' + channelNodeIds});
    request.post(options).then(function(nodes) {
      logger.info({fileName: 'Channels', msg: 'Filtered Nodes: ' + JSON.stringify(nodes)});
      let foundPeer = {};
      simplifiedChannels.map(channel => {
        foundPeer = nodes.find(channelWithAlias => channel.nodeId === channelWithAlias.nodeId);
        channel.alias = foundPeer ? foundPeer.alias : channel.nodeId.substring(0, 20);
      });
      resolve(simplifiedChannels);
    }).catch(err => {
      resolve(simplifiedChannels);
    });  
  });
};

exports.getChannels = (req, res, next) => {
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/channels';
  options.form = {};
  if (req.query && req.query.nodeId) {
    options.form = req.query;
    logger.info({fileName: 'Channels', msg: 'Channels Node Id: ' + JSON.stringify(options.form)});
  }
  logger.info({fileName: 'Channels', msg: 'Options: ' + JSON.stringify(options)});
  if (common.read_dummy_data) {
    common.getDummyData('Channels').then(function(data) { res.status(200).json(arrangeChannels(data)); });
  } else {
    request.post(options).then(function (body) {
      logger.info({fileName: 'Channels', msg: 'All Channels: ' + JSON.stringify(body)});
      if(body && body.length) {
        simplifyAllChannels(body).then(function(simplifiedChannels) {
          logger.info({fileName: 'Channels', msg: 'Simplified Channels with Alias: ' + JSON.stringify(simplifiedChannels)});
          res.status(200).json(arrangeChannels(simplifiedChannels));
        });
      } else {
        res.status(200).json({activeChannels: [], pendingChannels: [], inactiveChannels: [], lightningBalances: { localBalance: 0, remoteBalance: 0 }, channelStatus: {active: { channels: 0, capacity: 0 }, inactive: { channels: 0, capacity: 0 }, pending: { channels:  0, capacity: 0 }}});
      }
    })
    .catch(errRes => {
      let err = JSON.parse(JSON.stringify(errRes));
      if (err.options && err.options.headers && err.options.headers.authorization) {
        delete err.options.headers.authorization;
      }
      if (err.response && err.response.request && err.response.request.headers && err.response.request.headers.authorization) {
        delete err.response.request.headers.authorization;
      }
      logger.error({fileName: 'Channels', lineNum: 35, msg: 'Get Channels Error: ' + JSON.stringify(err)});
      return res.status(err.statusCode ? err.statusCode : 500).json({
        message: 'Fetching Channels Failed!',
        error: err.error && err.error.error ? err.error.error : err.error ? err.error : "Unknown Server Error"
      });
    });
  }
};

exports.getChannelStats = (req, res, next) => {
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/channelstats';
  options.form = {};
  request.post(options).then((body) => { 
    logger.info({fileName: 'ChannelStats', msg: 'Channel Stats Response: ' + JSON.stringify(body)});
    res.status(201).json(body);
  })
  .catch(errRes => {
    let err = JSON.parse(JSON.stringify(errRes));
    if (err.options && err.options.headers && err.options.headers.authorization) {
      delete err.options.headers.authorization;
    }
    if (err.response && err.response.request && err.response.request.headers && err.response.request.headers.authorization) {
      delete err.response.request.headers.authorization;
    }
    logger.error({fileName: 'ChannelStats', lineNum: 54, msg: 'Get Channel Stats Error: ' + JSON.stringify(err)});
    return res.status(err.statusCode ? err.statusCode : 500).json({
      message: "Channel Stats Failed!",
      error: err.error && err.error.error ? err.error.error : err.error ? err.error : "Unknown Server Error"
    });
  });  
}

exports.openChannel = (req, res, next) => {
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/open';
  options.form = req.body;
  logger.info({fileName: 'Channels', msg: 'Open Channel Params: ' + JSON.stringify(options.form)});
  request.post(options).then((body) => {
    logger.info({fileName: 'Channels', msg: 'Open Channel Response: ' + JSON.stringify(body)});
    if(!body || body.error) {
      logger.error({fileName: 'Channels', lineNum: 140, msg: 'Open Channel Error: ' + ((!body || !body.error) ? 'Error From Server!' : JSON.stringify(body.error))});
      res.status(500).json({
        message: 'Open Channel Failed!',
        error: (!body) ? 'Error From Server!' : body.error
      });
    } else {
      res.status(201).json(body);
    }
  })
  .catch(errRes => {
    let err = JSON.parse(JSON.stringify(errRes));
    if (err.options && err.options.headers && err.options.headers.authorization) {
      delete err.options.headers.authorization;
    }
    if (err.response && err.response.request && err.response.request.headers && err.response.request.headers.authorization) {
      delete err.response.request.headers.authorization;
    }
    logger.error({fileName: 'Channels', lineNum: 58, msg: 'Open Channel Failed: ' + JSON.stringify(err)});
    return res.status(err.statusCode ? err.statusCode : 500).json({
      message: "Open Channel Failed!",
      error: err.error && err.error.error ? err.error.error : err.error ? err.error : "Unknown Server Error"
    });
  });
}

exports.updateChannelRelayFee = (req, res, next) => {
  options = common.getOptions();
  options.url = common.getSelLNServerUrl() + '/updaterelayfee';
  options.form = req.query;
  logger.info({fileName: 'Channels', msg: 'Update Relay Fee Params: ' + JSON.stringify(options.form)});
  request.post(options).then((body) => {
    logger.info({fileName: 'Channels', msg: 'Update Relay Fee Response: ' + JSON.stringify(body)});
    res.status(201).json(body);
  })
  .catch(errRes => {
    let err = JSON.parse(JSON.stringify(errRes));
    if (err.options && err.options.headers && err.options.headers.authorization) {
      delete err.options.headers.authorization;
    }
    if (err.response && err.response.request && err.response.request.headers && err.response.request.headers.authorization) {
      delete err.response.request.headers.authorization;
    }
    logger.error({fileName: 'Channels', lineNum: 186, msg: 'Update Relay Fee Failed: ' + JSON.stringify(err)});
    return res.status(err.statusCode ? err.statusCode : 500).json({
      message: "Update Relay Fee Failed!",
      error: err.error && err.error.error ? err.error.error : err.error ? err.error : "Unknown Server Error"
    });
  });
}

exports.closeChannel = (req, res, next) => {
  options = common.getOptions();
  if (req.query.force !== 'true') {
    options.url = common.getSelLNServerUrl() + '/close';
  } else {
    options.url = common.getSelLNServerUrl() + '/forceclose';
  }
  options.form = { channelId: req.query.channelId };
  logger.info({fileName: 'Channels', msg: 'Close Channel URL: ' + JSON.stringify(options.url)});
  logger.info({fileName: 'Channels', msg: 'Close Channel Params: ' + JSON.stringify(options.form)});
  request.post(options).then((body) => {
    logger.info({fileName: 'Channels', msg: 'Close Channel Response: ' + JSON.stringify(body)});
    res.status(204).json(body);
  })
  .catch(errRes => {
    let err = JSON.parse(JSON.stringify(errRes));
    if (err.options && err.options.headers && err.options.headers.authorization) {
      delete err.options.headers.authorization;
    }
    if (err.response && err.response.request && err.response.request.headers && err.response.request.headers.authorization) {
      delete err.response.request.headers.authorization;
    }
    logger.error({fileName: 'Channels', lineNum: 217, msg: 'Close Channel Failed: ' + JSON.stringify(err)});
    return res.status(err.statusCode ? err.statusCode : 500).json({
      message: "Close Channel Failed!",
      error: err.error && err.error.error ? err.error.error : err.error ? err.error : "Unknown Server Error"
    });
  });
}