var fs = require('fs');
var crypto = require('crypto');
var path = require('path');
var common = {};
const MONTH_NAMES = ['JAN', 'FEB', 'MAR', 'APR', 'MAY', 'JUN', 'JUL', 'AUG', 'SEP', 'OCT', 'NOV', 'DEC'];
var dummy_data_array_from_file = [];

common.rtl_conf_file_path = '';
common.rtl_pass = '';
common.rtl_secret2fa = '';
common.rtl_sso = 0;
common.port = 3000;
common.host = null;
common.rtl_cookie_path = '';
common.logout_redirect_link = '';
common.cookie = '';
common.secret_key = crypto.randomBytes(64).toString('hex');
common.nodes = [];
common.selectedNode = {};
common.read_dummy_data = false;

common.getSwapServerOptions = () => {
  let swapOptions = {
    url: common.selectedNode.swap_server_url,
    rejectUnauthorized: false,
    json: true,
    headers: {
      'Grpc-Metadata-macaroon': ''
    }
  };
  if (common.selectedNode.swap_macaroon_path) {
    try {
      swapOptions.headers = {'Grpc-Metadata-macaroon': fs.readFileSync(path.join(common.selectedNode.swap_macaroon_path, 'loop.macaroon')).toString('hex')};
    } catch(err) {
      console.error('Loop macaroon Error: ' + JSON.stringify(err));
    }
  }
  return swapOptions;
};

common.getBoltzServerOptions = () => {
  let boltzOptions = {
    url: common.selectedNode.boltz_server_url,
    rejectUnauthorized: false,
    json: true,
    headers: {
      'Grpc-Metadata-macaroon': ''
    }
  };
  if (common.selectedNode.boltz_macaroon_path) {
    try {
      boltzOptions.headers = {'Grpc-Metadata-macaroon': fs.readFileSync(path.join(common.selectedNode.boltz_macaroon_path, 'admin.macaroon')).toString('hex')};
    } catch(err) {
      console.error('Boltz macaroon Error: ' + JSON.stringify(err));
    }
  }
  return boltzOptions;
};

common.getSelLNServerUrl = () => {
  return common.selectedNode.ln_server_url;
};

common.getOptions = () => {
  common.selectedNode.options.method = common.selectedNode.ln_implementation.toUpperCase() !== 'ECL' ? 'GET' : 'POST';
  delete common.selectedNode.options.form;
  common.selectedNode.options.qs = {};
  return common.selectedNode.options;
};

common.updateSelectedNodeOptions = () => {
  if (!common.selectedNode) {
    common.selectedNode = {};
  }
  common.selectedNode.options = {
    url: '',
    rejectUnauthorized: false,
    json: true,
    form: null
  };
  try {
    if (common.selectedNode && common.selectedNode.ln_implementation) {
      switch (common.selectedNode.ln_implementation.toUpperCase()) {
        case 'CLT':
          common.selectedNode.options.headers = { 'macaroon': Buffer.from(fs.readFileSync(path.join(common.selectedNode.macaroon_path, 'access.macaroon'))).toString("base64") };
          break;
      
        case 'ECL':
          common.selectedNode.options.headers = { 'authorization': 'Basic ' + Buffer.from(':' + common.selectedNode.ln_api_password).toString('base64') };
          break;

        default:
          common.selectedNode.options.headers = { 'Grpc-Metadata-macaroon': fs.readFileSync(path.join(common.selectedNode.macaroon_path, 'admin.macaroon')).toString('hex') };
          break;
      }
    }
    return { status: 200, message: 'Updated Successfully!' };
  } catch(err) {
    common.selectedNode.options = {
      url: '',
      rejectUnauthorized: false,
      json: true,
      form: null
    };
    console.error('Common Update Selected Node Options Error:' + JSON.stringify(err));    
    return { status: 502, message: err };
  }
}

common.setOptions = () => {
  if ( common.nodes[0].options &&  common.nodes[0].options.headers) { return; }
  if (common.nodes && common.nodes.length > 0) {
    common.nodes.forEach(node => {
      node.options = {
        url: '',
        rejectUnauthorized: false,
        json: true,
        form: null
      };
      try {
        if (node.ln_implementation) {
          switch (node.ln_implementation.toUpperCase()) {
            case 'CLT':
              node.options.headers = { 'macaroon': Buffer.from(fs.readFileSync(path.join(node.macaroon_path, 'access.macaroon'))).toString("base64") };
              break;
          
            case 'ECL':
              node.options.headers = { 'authorization': 'Basic ' + Buffer.from(':' + node.ln_api_password).toString('base64') };
              break;

            default:
              node.options.headers = { 'Grpc-Metadata-macaroon': fs.readFileSync(path.join(node.macaroon_path, 'admin.macaroon')).toString('hex') };
              break;
          }
        }
      } catch (err) {
        console.error('Common Set Options Error:' + JSON.stringify(err));
        node.options = {
          url: '',
          rejectUnauthorized: false,
          json: true,
          form: ''
        };
      }
    });
    common.updateSelectedNodeOptions();        
  }
}

common.findNode = (selNodeIndex) => {
  return common.nodes.find(node => node.index == selNodeIndex);
}

common.replaceNode = (selNodeIndex, newNode) => {
  let foundIndex = common.nodes.findIndex((node) => node.index == selNodeIndex);
  common.nodes.splice(foundIndex, 1, newNode);
  common.selectedNode = common.findNode(selNodeIndex);
}

common.convertToBTC = (num) => {
  return (num / 100000000).toFixed(6);
};

common.convertTimestampToDate = (num) => {
  let myDate = new Date(+num * 1000);
  let days = myDate.getDate().toString();
  days = +days < 10 ? '0' + days : days;
  let hours = myDate.getHours().toString();
  hours = +hours < 10 ? '0' + hours : hours;
  let minutes = myDate.getMinutes().toString();
  minutes = +minutes < 10 ? '0' + minutes : minutes;
  return days + "/" + MONTH_NAMES[myDate.getMonth()] + "/" + myDate.getFullYear() + " " + hours + ":" + minutes;
};

common.convertTimestampToLocalDate = (num) => {
  let myDate = new Date(+num * 1000);
  let days = myDate.getDate().toString();
  days = +days < 10 ? '0' + days : days;
  let hours = myDate.getHours().toString();
  hours = +hours < 10 ? '0' + hours : hours;
  let minutes = myDate.getMinutes().toString();
  minutes = +minutes < 10 ? '0' + minutes : minutes;
  let seconds = myDate.getSeconds().toString();
  seconds = +seconds < 10 ? '0' + seconds : seconds;
  return days + "/" + (MONTH_NAMES[myDate.getMonth()]) + "/" + myDate.getFullYear() + " " + hours + ":" + minutes + ":" + seconds;
};

common.sortAscByKey = (array, key) => {
  return array.sort(function (a, b) {
    var x = +a[key]; var y = +b[key];
    return ((x < y) ? -1 : ((x > y) ? 1 : 0));
  });
}

common.sortDescByKey = (array, key) => {
  const temp = array.sort(function (a, b) {
    var x = +a[key]; var y = +b[key];
    return (x > y) ? -1 : ((x < y) ? 1 : 0);
  });
  return temp;
}

common.sortAscByStrKey = (array, key) => {
  return array.sort(function (a, b) {
    var x = a[key] ? a[key].toUpperCase() : ''; var y = b[key] ? b[key].toUpperCase() : '';
    return ((x < y) ? -1 : ((x > y) ? 1 : 0));
  });
}

common.sortDescByStrKey = (array, key) => {
  const temp = array.sort(function (a, b) {
    var x = a[key] ? a[key].toUpperCase() : ''; var y = b[key] ? b[key].toUpperCase() : '';
    return (x > y) ? -1 : ((x < y) ? 1 : 0);
  });
  return temp;
}

common.newestOnTop = (array, key, value) => {
  var index = array.findIndex(function (item) {
    return item[key] === value
  });
  var newlyAddedRecord = array.splice(index, 1);
  array.unshift(newlyAddedRecord[0]);
  return array;
}

common.getRequestIP = (req) => {
  return (typeof req.headers['x-forwarded-for'] === 'string' && req.headers['x-forwarded-for'].split(',').shift())
    || req.ip
    || req.connection.remoteAddress
    || req.socket.remoteAddress
    || (req.connection.socket ? req.connection.socket.remoteAddress : null);
}

common.getDummyData = (data_key) => {
  let dummyDataFile = common.rtl_conf_file_path +  common.path_separator + 'ECLDummyData.log';
  return new Promise(function(resolve, reject) {
    if (dummy_data_array_from_file.length === 0) {
      fs.readFile(dummyDataFile, 'utf8', function(err, data) {
        if (err) {
          if (err.code === 'ENOENT') {
            console.error('Dummy data file does not exist!');
          } else {
            console.error('Getting dummy data failed!');
          }
        } else {
          dummy_data_array_from_file = data.split('\n');
          resolve(filterData(data_key));
        }
      });
    } else {
      resolve(filterData(data_key));
    }
  });
}

filterData = (data_key) => {
  let search_string = '';
  switch (data_key) {
    case 'GetInfo':
      search_string = 'INFO: GetInfo => Get Info Response: ';
      break;
  
    case 'Fees':
      search_string = 'INFO: Fees => Fee Response: ';
      break;

    case 'Payments':
      search_string = 'INFO: Fees => Payments Response: ';
      break;
  
    case 'OnChainBalance':
      search_string = 'INFO: Onchain => Balance Received: ';
      break;

    case 'Peers':
      search_string = 'INFO: Peers => Peers with Alias: ';
      break;
        
    case 'Channels':
      search_string = 'INFO: Channels => Simplified Channels with Alias: ';
      break;

    default:
      search_string = 'INFO: GetInfo => Get Info Response: ';
      break;
  }
  let foundDataLine = dummy_data_array_from_file.find(dataItem => dataItem.includes(search_string));
  let dataStr = foundDataLine ? foundDataLine.replace(search_string, '') : {};
  return JSON.parse(dataStr);
}

module.exports = common;