'use strict';
// @ts-check;
// ==================================================================================
// battery.js
// ----------------------------------------------------------------------------------
// Description:   System Information - library
//                for Node.js
// Copyright:     (c) 2014 - 2021
// Author:        Sebastian Hildebrandt
// ----------------------------------------------------------------------------------
// License:       MIT
// ==================================================================================
// 6. Battery
// ----------------------------------------------------------------------------------

const exec = require('child_process').exec;
const fs = require('fs');
const util = require('./util');

let _platform = process.platform;

const _linux = (_platform === 'linux');
const _darwin = (_platform === 'darwin');
const _windows = (_platform === 'win32');
const _freebsd = (_platform === 'freebsd');
const _openbsd = (_platform === 'openbsd');
const _netbsd = (_platform === 'netbsd');
const _sunos = (_platform === 'sunos');

module.exports = function (callback) {

  return new Promise((resolve) => {
    process.nextTick(() => {
      let result = {
        hasBattery: false,
        cycleCount: 0,
        isCharging: false,
        designedCapacity: 0,
        maxCapacity: 0,
        currentCapacity: 0,
        voltage: 0,
        capacityUnit: '',
        percent: 0,
        timeRemaining: null,
        acConnected: true,
        type: '',
        model: '',
        manufacturer: '',
        serial: ''
      };

      if (_linux) {
        let battery_path = '';
        if (fs.existsSync('/sys/class/power_supply/BAT1/uevent')) {
          battery_path = '/sys/class/power_supply/BAT1/';
        } else if (fs.existsSync('/sys/class/power_supply/BAT0/uevent')) {
          battery_path = '/sys/class/power_supply/BAT0/';
        }
        if (battery_path) {
          fs.readFile(battery_path + 'uevent', function (error, stdout) {
            if (!error) {
              let lines = stdout.toString().split('\n');

              result.isCharging = (util.getValue(lines, 'POWER_SUPPLY_STATUS', '=').toLowerCase() === 'charging');
              result.acConnected = result.isCharging;
              result.voltage = parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_VOLTAGE_NOW', '='), 10) / 1000000.0;
              result.capacityUnit = result.voltage ? 'mWh' : 'mAh';
              result.cycleCount = parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_CYCLE_COUNT', '='), 10);
              result.maxCapacity = Math.round(parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_CHARGE_FULL', '='), 10) / 1000.0 / (result.voltage || 1));
              result.designedCapacity = Math.round(parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_CHARGE_FULL_DESIGN', '='), 10) / 1000.0 / (result.voltage || 1)) | result.maxcapacity;
              result.currentCapacity = Math.round(parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_CHARGE_NOW', '='), 10) / 1000.0 / (result.voltage || 1));
              if (!result.maxCapacity) {
                result.maxCapacity = parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_ENERGY_FULL', '='), 10) / 1000.0;
                result.designCapacity = parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_ENERGY_FULL_DESIGN', '='), 10) / 1000.0 | result.maxCapacity;
                result.currentCapacity = parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_ENERGY_NOW', '='), 10) / 1000.0;
              }
              const percent = util.getValue(lines, 'POWER_SUPPLY_CAPACITY', '=');
              const energy = parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_ENERGY_NOW', '='), 10);
              const power = parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_POWER_NOW', '='), 10);
              const current = parseInt('0' + util.getValue(lines, 'POWER_SUPPLY_CURRENT_NOW', '='), 10);

              result.percent = parseInt('0' + percent, 10);
              if (result.maxCapacity && result.currentCapacity) {
                result.hasBattery = true;
                if (!percent) {
                  result.percent = 100.0 * result.currentCapacity / result.maxCapacity;
                }
              }
              if (result.isCharging) {
                result.hasBattery = true;
              }
              if (energy && power) {
                result.timeRemaining = Math.floor(energy / power * 60);
              } else if (current && result.currentCapacity) {
                result.timeRemaining = Math.floor(result.currentCapacity / current * 60);
              }
              result.type = util.getValue(lines, 'POWER_SUPPLY_TECHNOLOGY', '=');
              result.model = util.getValue(lines, 'POWER_SUPPLY_MODEL_NAME', '=');
              result.manufacturer = util.getValue(lines, 'POWER_SUPPLY_MANUFACTURER', '=');
              result.serial = util.getValue(lines, 'POWER_SUPPLY_SERIAL_NUMBER', '=');
              if (callback) { callback(result); }
              resolve(result);
            } else {
              if (callback) { callback(result); }
              resolve(result);
            }
          });
        } else {
          if (callback) { callback(result); }
          resolve(result);
        }
      }
      if (_freebsd || _openbsd || _netbsd) {
        exec('sysctl hw.acpi.battery hw.acpi.acline', function (error, stdout) {
          let lines = stdout.toString().split('\n');
          const batteries = parseInt('0' + util.getValue(lines, 'hw.acpi.battery.units'), 10);
          const percent = parseInt('0' + util.getValue(lines, 'hw.acpi.battery.life'), 10);
          result.hasBattery = (batteries > 0);
          result.cycleCount = null;
          result.isCharging = util.getValue(lines, 'hw.acpi.acline') !== '1';
          result.acConnected = result.isCharging;
          result.maxCapacity = null;
          result.currentCapacity = null;
          result.capacityUnit = 'unknown';
          result.percent = batteries ? percent : null;
          if (callback) { callback(result); }
          resolve(result);
        });
      }

      if (_darwin) {
        exec('ioreg -n AppleSmartBattery -r | egrep "CycleCount|IsCharging|DesignCapacity|MaxCapacity|CurrentCapacity|BatterySerialNumber|TimeRemaining|Voltage"; pmset -g batt | grep %', function (error, stdout) {
          if (stdout) {
            let lines = stdout.toString().replace(/ +/g, '').replace(/"+/g, '').replace(/-/g, '').split('\n');
            result.cycleCount = parseInt('0' + util.getValue(lines, 'cyclecount', '='), 10);
            result.voltage = parseInt('0' + util.getValue(lines, 'voltage', '='), 10) / 1000.0;
            result.capacityUnit = result.voltage ? 'mWh' : 'mAh';
            result.maxCapacity = Math.round(parseInt('0' + util.getValue(lines, 'maxcapacity', '='), 10) * (result.voltage || 1));
            result.currentCapacity = Math.round(parseInt('0' + util.getValue(lines, 'currentcapacity', '='), 10) * (result.voltage || 1));
            result.designedCapacity = Math.round(parseInt('0' + util.getValue(lines, 'DesignCapacity', '='), 10) * (result.voltage || 1));
            result.manufacturer = 'Apple';
            result.serial = util.getValue(lines, 'BatterySerialNumber', '=');
            let percent = null;
            const line = util.getValue(lines, 'internal', 'Battery');
            let parts = line.split(';');
            if (parts && parts[0]) {
              let parts2 = parts[0].split('\t');
              if (parts2 && parts2[1]) {
                percent = parseFloat(parts2[1].trim().replace(/%/g, ''));
              }
            }
            if (parts && parts[1]) {
              result.isCharging = (parts[1].trim() === 'charging');
              result.acConnected = (parts[1].trim() !== 'discharging');
            } else {
              result.isCharging = util.getValue(lines, 'ischarging', '=').toLowerCase() === 'yes';
              result.acConnected = result.isCharging;
            }
            if (result.maxCapacity && result.currentCapacity) {
              result.hasBattery = true;
              result.type = 'Li-ion';
              result.percent = percent !== null ? percent : Math.round(100.0 * result.currentCapacity / result.maxCapacity);
              if (!result.isCharging) {
                result.timeRemaining = parseInt('0' + util.getValue(lines, 'TimeRemaining', '='), 10);
              }
            }
          }
          if (callback) { callback(result); }
          resolve(result);
        });
      }
      if (_sunos) {
        if (callback) { callback(result); }
        resolve(result);
      }
      if (_windows) {
        try {
          util.wmic('Path Win32_Battery Get BatteryStatus, DesignCapacity, EstimatedChargeRemaining, DesignVoltage, FullChargeCapacity /value').then((stdout) => {
            if (stdout) {
              let lines = stdout.split('\r\n');
              let status = util.getValue(lines, 'BatteryStatus', '=').trim();
              // 1 = "Discharging"
              // 2 = "On A/C"
              // 3 = "Fully Charged"
              // 4 = "Low"
              // 5 = "Critical"
              // 6 = "Charging"
              // 7 = "Charging High"
              // 8 = "Charging Low"
              // 9 = "Charging Critical"
              // 10 = "Undefined"
              // 11 = "Partially Charged"
              if (status && status != '10') {
                const statusValue = parseInt(status);
                result.hasBattery = true;
                result.maxCapacity = parseInt(util.getValue(lines, 'DesignCapacity', '=') || 0);
                result.designCapacity = parseInt(util.getValue(lines, 'DesignCapacity', '=') || 0);
                result.voltage = parseInt(util.getValue(lines, 'DesignVoltage', '=') || 0) / 1000.0;
                result.capacityUnit = 'mWh';
                result.percent = parseInt(util.getValue(lines, 'EstimatedChargeRemaining', '=') || 0);
                result.currentCapacity = parseInt(result.maxcapacity * result.percent / 100);
                result.isCharging = (statusValue >= 6 && statusValue <= 9) || statusValue === 11 || (!(statusValue === 3) && !(statusValue === 1) && result.percent < 100);
                result.acConnected = result.ischarging || statusValue === 2;
              }
            }
            if (callback) { callback(result); }
            resolve(result);
          });
        } catch (e) {
          if (callback) { callback(result); }
          resolve(result);
        }
      }
    });
  });
};
