'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');

function parseWinBatteryPart(lines, designCapacity, fullChargeCapacity) {
  const result = {};
  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 >= 0) {
    const statusValue = status ? parseInt(status) : 0;
    result.status = statusValue;
    result.hasBattery = true;
    result.maxCapacity = fullChargeCapacity || parseInt(util.getValue(lines, 'DesignCapacity', '=') || 0);
    result.designCapacity = parseInt(util.getValue(lines, 'DesignCapacity', '=') || designCapacity);
    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;
    result.model = util.getValue(lines, 'DeviceID', '=');
  } else {
    result.status = -1;
  }

  return result;
}

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 {
          const workload = [];
          workload.push(util.wmic('Path Win32_Battery Get /value'));
          workload.push(util.powerShell('(Get-WmiObject -Class BatteryStaticData -Namespace ROOT/WMI).DesignedCapacity'));
          workload.push(util.powerShell('(Get-WmiObject -Class BatteryFullChargedCapacity -Namespace ROOT/WMI).FullChargedCapacity'));
          util.promiseAll(
            workload
          ).then(data => {
            if (data) {
              // let parts = data.results[0].split(/\n\s*\n/);
              let parts = data.results[0].split('\r\n');
              let batteries = [];
              for (let i = 0; i < parts.length; i++) {
                const hasValue = value => /\S/.test(value);
                if (hasValue(parts[i]) && (!batteries.length || !hasValue(parts[i - 1]))) {
                  batteries.push([]);
                }
                if (hasValue(parts[i])) {
                  batteries[batteries.length - 1].push(parts[i]);
                }
              }
              let designCapacities = data.results[1].split('\r\n');
              let fullChargeCapacities = data.results[2].split('\r\n');
              if (batteries.length) {
                let first = false;
                let additionalBatteries = [];
                for (let i = 0; i < batteries.length; i++) {
                  let lines = batteries[i];
                  const designCapacity = designCapacities && designCapacities.length >= (i + 1) && designCapacities[i] ? util.toInt(designCapacities[i]) : 0;
                  const fullChargeCapacity = fullChargeCapacities && fullChargeCapacities.length >= (i + 1) && fullChargeCapacities[i] ? util.toInt(fullChargeCapacities[i]) : 0;
                  const parsed = parseWinBatteryPart(lines, designCapacity, fullChargeCapacity);
                  if (!first && parsed.status > 0 && parsed.status !== 10) {
                    result.hasBattery = parsed.hasBattery;
                    result.maxCapacity = parsed.maxCapacity;
                    result.designCapacity = parsed.designCapacity;
                    result.voltage = parsed.voltage;
                    result.capacityUnit = parsed.capacityUnit;
                    result.percent = parsed.percent;
                    result.currentCapacity = parsed.currentCapacity;
                    result.isCharging = parsed.isCharging;
                    result.acConnected = parsed.acConnected;
                    result.model = parsed.model;
                    first = true;
                  } else if (parsed.status !== -1) {
                    additionalBatteries.push(
                      {
                        hasBattery: parsed.hasBattery,
                        maxCapacity: parsed.maxCapacity,
                        designCapacity: parsed.designCapacity,
                        voltage: parsed.voltage,
                        capacityUnit: parsed.capacityUnit,
                        percent: parsed.percent,
                        currentCapacity: parsed.currentCapacity,
                        isCharging: parsed.isCharging,
                        timeRemaining: null,
                        acConnected: parsed.acConnected,
                        model: parsed.model,
                        type: '',
                        manufacturer: '',
                        serial: ''
                      }
                    );
                  }
                }
                if (!first && additionalBatteries.length) {
                  result = additionalBatteries[0];
                  additionalBatteries.shift();
                }
                if (additionalBatteries.length) {
                  result.additionalBatteries = additionalBatteries;
                }
              }
            }
            if (callback) { callback(result); }
            resolve(result);
          });
        } catch (e) {
          if (callback) { callback(result); }
          resolve(result);
        }
      }
    });
  });
};
