/*
  settings.c - eeprom configuration handling 
  Part of Grbl

  The MIT License (MIT)

  GRBL(tm) - Embedded CNC g-code interpreter and motion-controller
  Copyright (c) 2009-2011 Simen Svale Skogsrud
  Copyright (c) 2011-2012 Sungeun K. Jeon

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
*/

#include <avr/io.h>
#include "protocol.h"
#include "report.h"
#include "stepper.h"
#include "nuts_bolts.h"
#include "settings.h"
#include "eeprom.h"
#include "limits.h"

settings_t settings;

// Version 4 outdated settings record
typedef struct {
  float steps_per_mm[3];
  uint8_t microsteps;
  uint8_t pulse_microseconds;
  float default_feed_rate;
  float default_seek_rate;
  uint8_t invert_mask;
  float mm_per_arc_segment;
  float acceleration;
  float junction_deviation;
} settings_v4_t;


// Method to store startup lines into EEPROM
void settings_store_startup_line(uint8_t n, char *line)
{
  uint16_t addr = n*(LINE_BUFFER_SIZE+1)+EEPROM_ADDR_STARTUP_BLOCK;
  memcpy_to_eeprom_with_checksum(addr,(char*)line, LINE_BUFFER_SIZE);
}

// Method to store coord data parameters into EEPROM
void settings_write_coord_data(uint8_t coord_select, float *coord_data)
{  
  uint16_t addr = coord_select*(sizeof(float)*N_AXIS+1) + EEPROM_ADDR_PARAMETERS;
  memcpy_to_eeprom_with_checksum(addr,(char*)coord_data, sizeof(float)*N_AXIS);
}  

// Method to store Grbl global settings struct and version number into EEPROM
void write_global_settings() 
{
  eeprom_put_char(0, SETTINGS_VERSION);
  memcpy_to_eeprom_with_checksum(EEPROM_ADDR_GLOBAL, (char*)&settings, sizeof(settings_t));
}

// Method to reset Grbl global settings back to defaults. 
void settings_reset(bool reset_all) {
  // Reset all settings or only the migration settings to the new version.
  if (reset_all) {
    settings.steps_per_mm[X_AXIS] = DEFAULT_X_STEPS_PER_MM;
    settings.steps_per_mm[Y_AXIS] = DEFAULT_Y_STEPS_PER_MM;
    settings.steps_per_mm[Z_AXIS] = DEFAULT_Z_STEPS_PER_MM;
    settings.pulse_microseconds = DEFAULT_STEP_PULSE_MICROSECONDS;
    settings.default_feed_rate = DEFAULT_FEEDRATE;
    settings.default_seek_rate = DEFAULT_RAPID_FEEDRATE;
    settings.acceleration = DEFAULT_ACCELERATION;
    settings.mm_per_arc_segment = DEFAULT_MM_PER_ARC_SEGMENT;
    settings.invert_mask = DEFAULT_STEPPING_INVERT_MASK;
    settings.junction_deviation = DEFAULT_JUNCTION_DEVIATION;
  }
  // New settings since last version
  settings.flags = 0;
  if (DEFAULT_REPORT_INCHES) { settings.flags |= BITFLAG_REPORT_INCHES; }
  if (DEFAULT_AUTO_START) { settings.flags |= BITFLAG_AUTO_START; }
  if (DEFAULT_INVERT_ST_ENABLE) { settings.flags |= BITFLAG_INVERT_ST_ENABLE; }
  if (DEFAULT_HARD_LIMIT_ENABLE) { settings.flags |= BITFLAG_HARD_LIMIT_ENABLE; }
  if (DEFAULT_HOMING_ENABLE) { settings.flags |= BITFLAG_HOMING_ENABLE; }
  settings.homing_dir_mask = DEFAULT_HOMING_DIR_MASK;
  settings.homing_feed_rate = DEFAULT_HOMING_FEEDRATE;
  settings.homing_seek_rate = DEFAULT_HOMING_RAPID_FEEDRATE;
  settings.homing_debounce_delay = DEFAULT_HOMING_DEBOUNCE_DELAY;
  settings.homing_pulloff = DEFAULT_HOMING_PULLOFF;
  settings.stepper_idle_lock_time = DEFAULT_STEPPER_IDLE_LOCK_TIME;
  settings.decimal_places = DEFAULT_DECIMAL_PLACES;
  settings.n_arc_correction = DEFAULT_N_ARC_CORRECTION;
  write_global_settings();
}

// Reads startup line from EEPROM. Updated pointed line string data.
uint8_t settings_read_startup_line(uint8_t n, char *line)
{
  uint16_t addr = n*(LINE_BUFFER_SIZE+1)+EEPROM_ADDR_STARTUP_BLOCK;
  if (!(memcpy_from_eeprom_with_checksum((char*)line, addr, LINE_BUFFER_SIZE))) {
    // Reset line with default value
    line[0] = 0;
    settings_store_startup_line(n, line);
    return(false);
  } else {
    return(true);
  }
}

// Read selected coordinate data from EEPROM. Updates pointed coord_data value.
uint8_t settings_read_coord_data(uint8_t coord_select, float *coord_data)
{
  uint16_t addr = coord_select*(sizeof(float)*N_AXIS+1) + EEPROM_ADDR_PARAMETERS;
  if (!(memcpy_from_eeprom_with_checksum((char*)coord_data, addr, sizeof(float)*N_AXIS))) {
    // Reset with default zero vector
    clear_vector_float(coord_data); 
    settings_write_coord_data(coord_select,coord_data);
    return(false);
  } else {
    return(true);
  }
}  

// Reads Grbl global settings struct from EEPROM.
uint8_t read_global_settings() {
  // Check version-byte of eeprom
  uint8_t version = eeprom_get_char(0);
  
  if (version == SETTINGS_VERSION) {
    // Read settings-record and check checksum
    if (!(memcpy_from_eeprom_with_checksum((char*)&settings, EEPROM_ADDR_GLOBAL, sizeof(settings_t)))) {
      return(false);
    }
  } else {
    if (version <= 4) {
      // Migrate from settings version 4 to current version.
      if (!(memcpy_from_eeprom_with_checksum((char*)&settings, 1, sizeof(settings_v4_t)))) {
        return(false);
      }     
      settings_reset(false); // Old settings ok. Write new settings only.
    } else {      
      return(false);
    }
  }
  return(true);
}


// A helper method to set settings from command line
uint8_t settings_store_global_setting(int parameter, float value) {
  switch(parameter) {
    case 0: case 1: case 2:
      if (value <= 0.0) { return(STATUS_SETTING_VALUE_NEG); } 
      settings.steps_per_mm[parameter] = value; break;
    case 3: 
      if (value < 3) { return(STATUS_SETTING_STEP_PULSE_MIN); }
      settings.pulse_microseconds = round(value); break;
    case 4: settings.default_feed_rate = value; break;
    case 5: settings.default_seek_rate = value; break;
    case 6: settings.invert_mask = trunc(value); break;
    case 7: settings.stepper_idle_lock_time = round(value); break;
    case 8: settings.acceleration = value*60*60; break; // Convert to mm/min^2 for grbl internal use.
    case 9: settings.junction_deviation = fabs(value); break;
    case 10: settings.mm_per_arc_segment = value; break;
    case 11: settings.n_arc_correction = round(value); break;
    case 12: settings.decimal_places = round(value); break;
    case 13:
      if (value) { settings.flags |= BITFLAG_REPORT_INCHES; }
      else { settings.flags &= ~BITFLAG_REPORT_INCHES; }
      break;
    case 14: // Reset to ensure change. Immediate re-init may cause problems.
      if (value) { settings.flags |= BITFLAG_AUTO_START; }
      else { settings.flags &= ~BITFLAG_AUTO_START; }
      break;
    case 15: // Reset to ensure change. Immediate re-init may cause problems.
      if (value) { settings.flags |= BITFLAG_INVERT_ST_ENABLE; }
      else { settings.flags &= ~BITFLAG_INVERT_ST_ENABLE; }
      break;
    case 16:
      if (value) { settings.flags |= BITFLAG_HARD_LIMIT_ENABLE; }
      else { settings.flags &= ~BITFLAG_HARD_LIMIT_ENABLE; }
      limits_init(); // Re-init to immediately change. NOTE: Nice to have but could be problematic later.
      break;
    case 17:
      if (value) { settings.flags |= BITFLAG_HOMING_ENABLE; }
      else { settings.flags &= ~BITFLAG_HOMING_ENABLE; }
      break;
    case 18: settings.homing_dir_mask = trunc(value); break;
    case 19: settings.homing_feed_rate = value; break;
    case 20: settings.homing_seek_rate = value; break;
    case 21: settings.homing_debounce_delay = round(value); break;
    case 22: settings.homing_pulloff = value; break;
    default: 
      return(STATUS_INVALID_STATEMENT);
  }
  write_global_settings();
  return(STATUS_OK);
}

// Initialize the config subsystem
void settings_init() {
  if(!read_global_settings()) {
    report_status_message(STATUS_SETTING_READ_FAIL);
    settings_reset(true);
    report_grbl_settings();
  }
  // Read all parameter data into a dummy variable. If error, reset to zero, otherwise do nothing.
  float coord_data[N_AXIS];
  uint8_t i;
  for (i=0; i<=SETTING_INDEX_NCOORD; i++) {
    if (!settings_read_coord_data(i, coord_data)) {
      report_status_message(STATUS_SETTING_READ_FAIL);
    }
  }
  // NOTE: Startup lines are handled and called by main.c at the end of initialization.
}