ESP32_ChinaDieselHeater_Control/src/OLED/PasswordScreen.cpp

/*
 * This file is part of the "bluetoothheater" distribution 
 * (https://gitlab.com/mrjones.id.au/bluetoothheater) 
 *
 * Copyright (C) 2018  Ray Jones <ray@mrjones.id.au>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 * 
 */


///////////////////////////////////////////////////////////////////////////
//
// CPasswordScreen
//
// This class allows a password entry page to pop up
//
///////////////////////////////////////////////////////////////////////////

#include "PasswordScreen.h"
#include "KeyPad.h"
#include "../Utility/macros.h"
#include "../Utility/NVStorage.h"
#include "fonts/Arial.h"

long CPasswordScreen::__Expiry = 0;

CPasswordScreen::CPasswordScreen(C128x64_OLED& display, CScreenManager& mgr) : CScreenHeader(display, mgr) 
{
  _initUI();
}

void
CPasswordScreen::onSelect()
{
  CScreenHeader::onSelect();
  _initUI();
}

void
CPasswordScreen::__initPassword(bool get)
{
  _bGetPassword = get && (__Expiry == 0);
  _bPasswordOK = false;
  _bPasswordOK |= __Expiry != 0;
  _PWcol = 0;
  // reset PW digits
  for(int i= 0; i < 4; i++) 
    _PWdig[i] = -1;
}

void
CPasswordScreen::_initUI()
{
  __initPassword(false);

  _SaveTime = 0;
}

void 
CPasswordScreen::_getPassword()
{
  __initPassword(true);
    
  _ScreenManager.reqUpdate();
}

bool 
CPasswordScreen::show()
{
  CPasswordScreen::animate();  // precautionary, in case derived class forgets to call
  
  if(_SaveTime) {
    _display.clearDisplay();
    _showStoringMessage();
    return true;
  }
  else if(_bGetPassword) {
    if(!_bPasswordOK) {
      _display.clearDisplay();
      _showPassword();
      return true;
    }
  }
  return false;
}

bool 
CPasswordScreen::animate()
{
  if(_SaveTime) {
    long tDelta = millis() - _SaveTime;
    if(tDelta > 0) {
      _SaveTime = 0;
      _ScreenManager.reqUpdate();
    }
  }
  return false;
}

bool
CPasswordScreen::_busy()
{
  return _SaveTime != 0;
}

void
CPasswordScreen::_holdPassword()
{
  if(NVstore.getUserSettings().holdPassword)
    __Expiry = millis() + 24 * 60 * 60 * 1000;  // 24 hours 
  else 
    __Expiry = 0;
}

bool 
CPasswordScreen::isPasswordBusy() 
{ 
//  return (_SaveTime != 0) || _bGetPassword; 
  if(__Expiry)
    return false;

  return _busy() || _bGetPassword;   
}

bool 
CPasswordScreen::keyHandler(uint8_t event)
{
  if(_bGetPassword) {

    if(_bPasswordOK) {
      _bGetPassword = false;
      return true;
    }

    if(event & keyPressed) {

      // press CENTRE
      if(event & key_Centre) {
        // match "1688"
        if((_PWdig[0] == 1) && 
           (_PWdig[1] == 6) && 
           (_PWdig[2] == 8) && 
           (_PWdig[3] == 8)) {
          _bPasswordOK = true;
          _holdPassword();
        }

        _bGetPassword = false;
        // reset PW digits
        for(int i= 0; i < 4; i++) 
          _PWdig[i] = -1;

      }

      // press LEFT 
      if(event & key_Left) {
        _PWcol--;
        LOWERLIMIT(_PWcol, 0);
      }

      // press RIGHT 
      if(event & key_Right) {
        _PWcol++;
        UPPERLIMIT(_PWcol, 5);
      }

      // press UP 
      if(event & key_Up) {
        _PWdig[_PWcol]++; 
        WRAPUPPERLIMIT(_PWdig[_PWcol], 9, 0);
      }

      // press DOWN
      if(event & key_Down) {
        _PWdig[_PWcol]--; 
        WRAPLOWERLIMIT(_PWdig[_PWcol], 0, 9);
      }
      _ScreenManager.reqUpdate();
    }
    return true;
  }
  return false;
}

bool
CPasswordScreen::_showPassword()
{
  if(_bGetPassword) {
    _showTitle("Enter password");

    // determine metrics of character sizing
    CTransientFont AF(_display, &arialBlack_12ptFontInfo);

    CRect extents;
    _display.getTextExtents("8", extents);
    int charWidth = extents.width;
    _display.getTextExtents(" ", extents);

    for(int idx =0 ; idx < 4; idx++) {

      extents.xPos = _display.xCentre() - (2 - idx) * (charWidth * 1.5); 
      extents.yPos = 30;

      char str[8];

      if(_PWdig[idx] < 0) {
        strcpy(str, "-");
      }
      else {
        sprintf(str, "%d", _PWdig[idx]);
      }
      _printMenuText(extents.xPos, extents.yPos, str, _PWcol == idx);
    }
  }
  return _bGetPassword;
}

void 
CPasswordScreen::_enableStoringMessage()
{
  _SaveTime = millis() + 1500;
  _ScreenManager.reqUpdate();
}


bool CPasswordScreen::_isPasswordOK() 
{ 
  if(__Expiry) {
    long tDelta = millis() - __Expiry;
    if(tDelta > 0) {
      __Expiry = 0;
      _bPasswordOK = false; 
    }
  }
  return __Expiry != 0 || _bPasswordOK; 
};