'use strict';
// @ts-check
// ==================================================================================
// dockerSockets.js
// ----------------------------------------------------------------------------------
// Description:   System Information - library
//                for Node.js
// Copyright:     (c) 2014 - 2020
// Author:        Sebastian Hildebrandt
// ----------------------------------------------------------------------------------
// License:       MIT
// ==================================================================================
// 13. DockerSockets
// ----------------------------------------------------------------------------------

const net = require('net');
const isWin = require('os').type() === 'Windows_NT';
const socketPath = isWin ? '//./pipe/docker_engine' : '/var/run/docker.sock';

class DockerSocket {

  getInfo(callback) {
    try {

      let socket = net.createConnection({ path: socketPath });
      let alldata = '';
      let data;

      socket.on('connect', () => {
        socket.write('GET http:/info HTTP/1.0\r\n\r\n');
      });

      socket.on('data', data => {
        alldata = alldata + data.toString();
      });

      socket.on('error', () => {
        socket = false;
        callback({});
      });

      socket.on('end', () => {
        let startbody = alldata.indexOf('\r\n\r\n');
        alldata = alldata.substring(startbody + 4);
        socket = false;
        try {
          data = JSON.parse(alldata);
          callback(data);
        } catch (err) {
          callback({});
        }
      });
    } catch (err) {
      callback({});
    }
  }

  listContainers(all, callback) {
    try {

      let socket = net.createConnection({ path: socketPath });
      let alldata = '';
      let data;

      socket.on('connect', () => {
        socket.write('GET http:/containers/json' + (all ? '?all=1' : '') + ' HTTP/1.0\r\n\r\n');
      });

      socket.on('data', data => {
        alldata = alldata + data.toString();
      });

      socket.on('error', () => {
        socket = false;
        callback({});
      });

      socket.on('end', () => {
        let startbody = alldata.indexOf('\r\n\r\n');
        alldata = alldata.substring(startbody + 4);
        socket = false;
        try {
          data = JSON.parse(alldata);
          callback(data);
        } catch (err) {
          callback({});
        }
      });
    } catch (err) {
      callback({});
    }
  }

  getStats(id, callback) {
    id = id || '';
    if (id) {
      try {
        let socket = net.createConnection({ path: socketPath });
        let alldata = '';
        let data;

        socket.on('connect', () => {
          socket.write('GET http:/containers/' + id + '/stats?stream=0 HTTP/1.0\r\n\r\n');
        });

        socket.on('data', data => {
          alldata = alldata + data.toString();
        });

        socket.on('error', () => {
          socket = false;
          callback({});
        });

        socket.on('end', () => {
          let startbody = alldata.indexOf('\r\n\r\n');
          alldata = alldata.substring(startbody + 4);
          socket = false;
          try {
            data = JSON.parse(alldata);
            callback(data);
          } catch (err) {
            callback({});
          }
        });
      } catch (err) {
        callback({});
      }
    } else {
      callback({});
    }
  }

  getInspect(id, callback) {
    id = id || '';
    if (id) {
      try {
        let socket = net.createConnection({ path: socketPath });
        let alldata = '';
        let data;

        socket.on('connect', () => {
          socket.write('GET http:/containers/' + id + '/json?stream=0 HTTP/1.0\r\n\r\n');
        });

        socket.on('data', data => {
          alldata = alldata + data.toString();
        });

        socket.on('error', () => {
          socket = false;
          callback({});
        });

        socket.on('end', () => {
          let startbody = alldata.indexOf('\r\n\r\n');
          alldata = alldata.substring(startbody + 4);
          socket = false;
          try {
            data = JSON.parse(alldata);
            callback(data);
          } catch (err) {
            callback({});
          }
        });
      } catch (err) {
        callback({});
      }
    } else {
      callback({});
    }
  }

  getProcesses(id, callback) {
    id = id || '';
    if (id) {
      try {
        let socket = net.createConnection({ path: socketPath });
        let alldata = '';
        let data;

        socket.on('connect', () => {
          socket.write('GET http:/containers/' + id + '/top?ps_args=-opid,ppid,pgid,vsz,time,etime,nice,ruser,user,rgroup,group,stat,rss,args HTTP/1.0\r\n\r\n');
        });

        socket.on('data', data => {
          alldata = alldata + data.toString();
        });

        socket.on('error', () => {
          socket = false;
          callback({});
        });

        socket.on('end', () => {
          let startbody = alldata.indexOf('\r\n\r\n');
          alldata = alldata.substring(startbody + 4);
          socket = false;
          try {
            data = JSON.parse(alldata);
            callback(data);
          } catch (err) {
            callback({});
          }
        });
      } catch (err) {
        callback({});
      }
    } else {
      callback({});
    }
  }
}

module.exports = DockerSocket;