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/**
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 * Marlin 3D Printer Firmware
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 * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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 *
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 * Based on Sprinter and grbl.
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 * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 */
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/**
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 * emergency_parser.h - Intercept special commands directly in the serial stream
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 */
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#ifndef _EMERGENCY_PARSER_H_
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#define _EMERGENCY_PARSER_H_
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// External references
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extern volatile bool wait_for_user, wait_for_heatup;
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void quickstop_stepper();
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class EmergencyParser {
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public:
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  // Currently looking for: M108, M112, M410
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  enum State : char {
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    EP_RESET,
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    EP_N,
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    EP_M,
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    EP_M1,
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    EP_M10,
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    EP_M108,
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    EP_M11,
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    EP_M112,
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    EP_M4,
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    EP_M41,
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    EP_M410,
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    EP_IGNORE // to '\n'
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  };
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  static bool killed_by_M112;
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  static State state;
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  EmergencyParser() {}
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  __attribute__((always_inline)) inline
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  static void update(const uint8_t c) {
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    switch (state) {
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      case EP_RESET:
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        switch (c) {
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          case ' ': break;
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          case 'N': state = EP_N;      break;
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          case 'M': state = EP_M;      break;
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          default: state  = EP_IGNORE;
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        }
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        break;
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      case EP_N:
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        switch (c) {
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          case '0': case '1': case '2':
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          case '3': case '4': case '5':
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          case '6': case '7': case '8':
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          case '9': case '-': case ' ':   break;
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          case 'M': state = EP_M;      break;
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          default:  state = EP_IGNORE;
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        }
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        break;
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      case EP_M:
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        switch (c) {
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          case ' ': break;
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          case '1': state = EP_M1;     break;
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          case '4': state = EP_M4;     break;
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          default: state  = EP_IGNORE;
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        }
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        break;
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      case EP_M1:
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        switch (c) {
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          case '0': state = EP_M10;    break;
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          case '1': state = EP_M11;    break;
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          default: state  = EP_IGNORE;
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        }
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        break;
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      case EP_M10:
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        state = (c == '8') ? EP_M108 : EP_IGNORE;
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        break;
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      case EP_M11:
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        state = (c == '2') ? EP_M112 : EP_IGNORE;
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        break;
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      case EP_M4:
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        state = (c == '1') ? EP_M41 : EP_IGNORE;
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        break;
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      case EP_M41:
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        state = (c == '0') ? EP_M410 : EP_IGNORE;
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        break;
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      case EP_IGNORE:
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        if (c == '\n') state = EP_RESET;
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        break;
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      default:
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        if (c == '\n') {
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          switch (state) {
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            case EP_M108:
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              wait_for_user = wait_for_heatup = false;
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              break;
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            case EP_M112:
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              killed_by_M112 = true;
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              break;
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            case EP_M410:
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              quickstop_stepper();
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              break;
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            default:
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              break;
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          }
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          state = EP_RESET;
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        }
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    }
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  }
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};
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extern EmergencyParser emergency_parser;
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#endif // _EMERGENCY_PARSER_H_