'use strict';
// ==================================================================================
// system.js
// ----------------------------------------------------------------------------------
// Description:   System Information - library
//                for Node.js
// Copyright:     (c) 2014 - 2017
// Author:        Sebastian Hildebrandt
// ----------------------------------------------------------------------------------
// License:       MIT
// ==================================================================================
// 2. System (Hardware)
// ----------------------------------------------------------------------------------

const os = require('os');
const exec = require('child_process').exec;
const fs = require('fs');

let _platform = os.type();

const _linux = (_platform === 'Linux');
const _darwin = (_platform === 'Darwin');
const _windows = (_platform === 'Windows_NT');

module.exports = function (callback) {

  return new Promise((resolve) => {
    process.nextTick(() => {

      let result = {
        manufacturer: '',
        model: 'Computer',
        version: '',
        serial: '-',
        uuid: '-'
      };

      if (_linux) {
        exec('dmidecode -t system', function (error, stdout) {
          if (!error) {
            let lines = stdout.toString().split('\n');
            lines.forEach(function (line) {
              if (line.indexOf(':') !== -1) {
                if (line.toLowerCase().indexOf('manufacturer') !== -1) result.manufacturer = result.manufacturer || line.split(':')[1].trim();
                if (line.toLowerCase().indexOf('product name') !== -1) result.model = line.split(':')[1].trim();
                if (line.toLowerCase().indexOf('version') !== -1) result.version = result.version || line.split(':')[1].trim();
                if (line.toLowerCase().indexOf('serial number') !== -1) result.serial = line.split(':')[1].trim();
                if (line.toLowerCase().indexOf('uuid') !== -1) result.uuid = line.split(':')[1].trim();
              }
            });
            if (result.serial.toLowerCase().indexOf('o.e.m.') !== -1) result.serial = '-';
            if (result.manufacturer.toLowerCase().indexOf('o.e.m.') !== -1) result.manufacturer = '';
            if (result.model.toLowerCase().indexOf('o.e.m.') !== -1) result.model = 'Computer';
            if (result.version.toLowerCase().indexOf('o.e.m.') !== -1) result.version = '-';

            if (result.manufacturer === '' && result.model === 'Computer' && result.version === '-') {
              // Check Raspberry Pi
              exec('grep Hardware /proc/cpuinfo; grep Serial /proc/cpuinfo; grep Revision /proc/cpuinfo', function (error, stdout) {
                if (!error) {
                  let lines = stdout.toString().split('\n');
                  lines.forEach(function (line) {
                    if (line.indexOf(':') !== -1) {
                      if (line.toLowerCase().indexOf('hardware') !== -1) result.model = line.split(':')[1].trim();
                      if (line.toLowerCase().indexOf('revision') !== -1) result.version = line.split(':')[1].trim();
                      if (line.toLowerCase().indexOf('serial') !== -1) result.serial = line.split(':')[1].trim();
                    }
                  });
                  if (result.model === 'BCM2835') {                     // Pi 3
                    result.manufacturer = 'Raspberry Pi Foundation';
                    result.model = result.model + ' - Pi 3 Model B';
                    if (['a02082', 'a22082', 'a32082'].indexOf(result.version) >= 0) {
                      result.version = result.version + ' - Rev. 1.2';
                    }
                  }
                  if (result.model === 'BCM2709') {                     // Pi 2
                    result.manufacturer = 'Raspberry Pi Foundation';
                    result.model = result.model + ' - Pi 2 Model B';
                    if (['a01041', 'a21041'].indexOf(result.version) >= 0) {
                      result.version = result.version + ' - Rev. 1.1';
                    }
                  }
                  if (result.model === 'BCM2708') {                     // Pi, Pi Zero
                    result.manufacturer = 'Raspberry Pi Foundation';
                    if (['0002', '0003'].indexOf(result.version) >= 0) {
                      result.model = result.model + ' - Pi Model B';
                      result.version = result.version + ' - Rev 1.0';
                    }
                    if (['900092'].indexOf(result.version) >= 0) {
                      result.model = result.model + ' - Pi Zero';
                      result.version = result.version + ' - Rev 1.2';
                    }
                    if (['900092', '900093', '920093'].indexOf(result.version) >= 0) {
                      result.model = result.model + ' - Pi Zero';
                      result.version = result.version + ' - Rev 1.3';
                    }
                    if (['0007', '0008', '0009'].indexOf(result.version) >= 0) {
                      result.model = result.model + ' - Pi Model A';
                      result.version = result.version + ' - Rev 2.0';
                    }
                    if (['0004', '0005', '0006', '000d', '000e', '000f'].indexOf(result.version) >= 0) {
                      result.model = result.model + ' - Pi Model B';
                      result.version = result.version + ' - Rev 2.0';
                    }
                    if (['0010'].indexOf(result.version) >= 0) {
                      result.model = result.model + ' - Pi Model B+';
                      result.version = result.version + ' - Rev 1.0';
                    }
                    if (['0012'].indexOf(result.version) >= 0) {
                      result.model = result.model + ' - Pi Model A+';
                      result.version = result.version + ' - Rev 1.0';
                    }
                    if (['0013'].indexOf(result.version) >= 0) {
                      result.model = result.model + ' - Pi Model B+';
                      result.version = result.version + ' - Rev 1.2';
                    }
                    if (['0015'].indexOf(result.version) >= 0) {
                      result.model = result.model + ' - Pi Model A+';
                      result.version = result.version + ' - Rev 1.1';
                    }
                  }
                }
                if (callback) { callback(result); }
                resolve(result);
              });
            } else {
              if (callback) { callback(result); }
              resolve(result);
            }
          } else {
            exec("dmesg | grep -i virtual | grep -iE 'vmware|qemu|kvm|xen'", function (error, stdout) {
              if (!error) {
                let lines = stdout.toString().split('\n');
                if (lines.length > 0) result.model = 'Virtual machine';
              }
              if (fs.existsSync('/.dockerenv') || fs.existsSync('/.dockerinit')) {
                result.model = 'Docker Container';
              }
              if (callback) { callback(result); }
              resolve(result);
            });
          }
        });
      }
      if (_darwin) {
        exec('ioreg -c IOPlatformExpertDevice -d 2', function (error, stdout) {
          if (!error) {
            let lines = stdout.toString().split('\n');
            lines.forEach(function (line) {
              line = line.replace(/[<>"]/g, '');
              if (line.indexOf('=') !== -1) {
                if (line.toLowerCase().indexOf('manufacturer') !== -1) result.manufacturer = line.split('=')[1].trim();
                if (line.toLowerCase().indexOf('model') !== -1) result.model = line.split('=')[1].trim();
                if (line.toLowerCase().indexOf('version') !== -1) result.version = line.split('=')[1].trim();
                if (line.toLowerCase().indexOf('ioplatformserialnumber') !== -1) result.serial = line.split('=')[1].trim();
                if (line.toLowerCase().indexOf('ioplatformuuid') !== -1) result.uuid = line.split('=')[1].trim();
              }
            });
          }
          if (callback) { callback(result); }
          resolve(result);
        });
      }
      if (_windows) {
        exec('wmic csproduct get', function (error, stdout) {
          if (!error) {
            let lines = stdout.split('\r\n').filter(line => line.trim() !== '').filter((line, idx) => idx > 0)[0].trim().split(/\s\s+/);
            result.manufacturer = lines[5];
            result.model = lines[3];
            result.version = lines[6];
            result.serial = lines[2];
            result.uuid = lines[4];
          }
          if (callback) { callback(result); }
          resolve(result);
        });
      }
    });
  });
};