/*
  Created: September 2012
  by ihsan Kehribar <ihsan@kehribar.me>

  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 <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include "micronucleus_lib.h"
#include "littleWire_util.h"

#define FILE_TYPE_INTEL_HEX 1
#define FILE_TYPE_RAW 2
#define CONNECT_WAIT 250 /* milliseconds to wait after detecting device on usb bus - probably excessive */

/******************************************************************************
* Global definitions
******************************************************************************/
unsigned char dataBuffer[65536 + 256];    /* buffer for file data */
/*****************************************************************************/

/******************************************************************************
* Function prototypes
******************************************************************************/
static int parseRaw(char *hexfile, unsigned char *buffer, int *startAddr, int *endAddr);
static int parseIntelHex(char *hexfile, unsigned char *buffer, int *startAddr, int *endAddr); /* taken from bootloadHID example from obdev */
static int parseUntilColon(FILE *fp); /* taken from bootloadHID example from obdev */
static int parseHex(FILE *fp, int numDigits); /* taken from bootloadHID example from obdev */
static void printProgress(float progress);
static void setProgressData(char* friendly, int step);
static int progress_step = 0; // current step
static int progress_total_steps = 0; // total steps for upload
static char* progress_friendly_name; // name of progress section
static int dump_progress = 0; // output computer friendly progress info
static int use_ansi = 0; // output ansi control character stuff
static int erase_only = 0; // only erase, dont't write file
static int timeout = 0;
/*****************************************************************************/

/******************************************************************************
* Main function!
******************************************************************************/
int main(int argc, char **argv) {
  int res;
  char *file = NULL;
  micronucleus *my_device = NULL;

  // parse arguments
  int run = 0;
  int file_type = FILE_TYPE_INTEL_HEX;
  int arg_pointer = 1;
  char* usage = "usage: micronucleus [--run] [--dump-progress] [--type intel-hex|raw] [--no-ansi] [--timeout integer] [--erase-only] filename";
  progress_step = 0;
  progress_total_steps = 5; // steps: waiting, connecting, parsing, erasing, writing, (running)?
  dump_progress = 0;
  erase_only = 0;
  timeout = 0; // no timeout by default
  //#if defined(WIN)
  //  use_ansi = 0;
  //#else
    use_ansi = 1;
  //#endif

  while (arg_pointer < argc) {
    if (strcmp(argv[arg_pointer], "--run") == 0) {
      run = 1;
      progress_total_steps += 1;
    } else if (strcmp(argv[arg_pointer], "--type") == 0) {
      arg_pointer += 1;
      if (strcmp(argv[arg_pointer], "intel-hex") == 0) {
        file_type = FILE_TYPE_INTEL_HEX;
      } else if (strcmp(argv[arg_pointer], "raw") == 0) {
        file_type = FILE_TYPE_RAW;
      } else {
        printf("Unknown File Type specified with --type option");
        return EXIT_FAILURE;
      }
    } else if (strcmp(argv[arg_pointer], "--help") == 0 || strcmp(argv[arg_pointer], "-h") == 0) {
      puts(usage);
      puts("");
      puts("  --type [intel-hex, raw]: Set upload file type to either intel hex or raw");
      puts("                           bytes (intel hex is default)");
      puts("          --dump-progress: Output progress data in computer-friendly form");
      puts("                           for driving GUIs");
      puts("             --erase-only: Erase the device without programming. Fills the");
      puts("                           program memory with 0xFFFF. Any files are ignored.");
      puts("                    --run: Ask bootloader to run the program when finished");
      puts("                           uploading provided program");
      //#ifndef WIN
      puts("                --no-ansi: Don't use ANSI in terminal output");
      //#endif
      puts("      --timeout [integer]: Timeout after waiting specified number of seconds");
      puts("                 filename: Path to intel hex or raw data file to upload,");
      puts("                           or \"-\" to read from stdin");
      return EXIT_SUCCESS;
    } else if (strcmp(argv[arg_pointer], "--dump-progress") == 0) {
      dump_progress = 1;
    } else if (strcmp(argv[arg_pointer], "--no-ansi") == 0) {
      use_ansi = 0;
    } else if (strcmp(argv[arg_pointer], "--erase-only") == 0) {
      erase_only = 1;
    } else if (strcmp(argv[arg_pointer], "--timeout") == 0) {
      arg_pointer += 1;
      if (sscanf(argv[arg_pointer], "%d", &timeout) != 1) {
        printf("Did not understand --timeout value\n");
        return EXIT_FAILURE;
      }
    } else {
      file = argv[arg_pointer];
    }

    arg_pointer += 1;
  }

  if (argc < 2) {
    puts(usage);
    return EXIT_FAILURE;
  }

  setProgressData("waiting", 1);
  if (dump_progress) printProgress(0.5);
  printf("> Please plug in the device ... \n");
  printf("> Press CTRL+C to terminate the program.\n");


  time_t start_time, current_time;
  time(&start_time);

  while (my_device == NULL) {
    delay(100);
    my_device = micronucleus_connect();

    time(&current_time);
    if (timeout && start_time + timeout < current_time) {
      break;
    }
  }

  if (my_device == NULL) {
    printf("> Device search timed out\n");
    return EXIT_FAILURE;
  }

  printf("> Device is found!\n");

  // wait for CONNECT_WAIT milliseconds with progress output
  float wait = 0.0f;
  setProgressData("connecting", 2);
  while (wait < CONNECT_WAIT) {
    printProgress((wait / ((float) CONNECT_WAIT)) * 0.9f);
    wait += 50.0f;
    delay(50);
  }

  //my_device = micronucleus_connect();
  printProgress(1.0);

  // if (my_device->page_size == 64) {
  //   printf("> Device looks like ATtiny85!\n");
  // } else if (my_device->page_size == 32)  {
  //   printf("> Device looks like ATtiny45!\n");
  // } else {
  //   printf("> Unsupported device!\n");
  //   return EXIT_FAILURE;
  // }

  printf("> Available space for user application: %d bytes\n", my_device->flash_size);
  printf("> Suggested sleep time between sending pages: %ums\n", my_device->write_sleep);
  printf("> Whole page count: %d\n", my_device->pages);
  printf("> Erase function sleep duration: %dms\n", my_device->erase_sleep);

  int startAddress = 1, endAddress = 0;

  if (!erase_only)
  {
    setProgressData("parsing", 3);
    printProgress(0.0);
    memset(dataBuffer, 0xFF, sizeof(dataBuffer));

    if (file_type == FILE_TYPE_INTEL_HEX) {
      if (parseIntelHex(file, dataBuffer, &startAddress, &endAddress)) {
        printf("> Error loading or parsing hex file.\n");
        return EXIT_FAILURE;
      }
    } else if (file_type == FILE_TYPE_RAW) {
      if (parseRaw(file, dataBuffer, &startAddress, &endAddress)) {
        printf("> Error loading raw file.\n");
        return EXIT_FAILURE;
      }
    }

    printProgress(1.0);

    if (startAddress >= endAddress) {
      printf("> No data in input file, exiting.\n");
      return EXIT_FAILURE;
    }

    if (endAddress > my_device->flash_size) {
      printf("> Program file is %d bytes too big for the bootloader!\n", endAddress - my_device->flash_size);
      return EXIT_FAILURE;
    }
  }

  printProgress(1.0);

  if (startAddress >= endAddress) {
    printf("> No data in input file, exiting.\n");
    return EXIT_FAILURE;
  }

  if (endAddress > my_device->flash_size) {
    printf("> Program file is %d bytes too big for the bootloader!\n", endAddress - my_device->flash_size);
    return EXIT_FAILURE;
  }

  setProgressData("erasing", 4);
  printf("> Erasing the memory ...\n");
  res = micronucleus_eraseFlash(my_device, printProgress);

  if (res == 1) { // erase disconnection bug workaround
    printf(">> Eep! Connection to device lost during erase! Not to worry\n");
    printf(">> This happens on some computers - reconnecting...\n");
    my_device = NULL;

    delay(CONNECT_WAIT);

    int deciseconds_till_reconnect_notice = 50; // notice after 5 seconds
    while (my_device == NULL) {
      delay(100);
      my_device = micronucleus_connect();
      deciseconds_till_reconnect_notice -= 1;

      if (deciseconds_till_reconnect_notice == 0) {
        printf(">> (!) Automatic reconnection not working. Unplug and reconnect\n");
        printf("   device usb connector, or reset it some other way to continue.\n");
      }
    }

    printf(">> Reconnected! Continuing upload sequence...\n");

  } else if (res != 0) {
    printf(">> Flash erase error %d has occured ...\n", res);
    printf(">> Please unplug the device and restart the program.\n");
    return EXIT_FAILURE;
  }
  printProgress(1.0);

  if (!erase_only)
  {
    printf("> Starting to upload ...\n");
    setProgressData("writing", 5);
    res = micronucleus_writeFlash(my_device, endAddress, dataBuffer, printProgress);
    if (res != 0) {
      printf(">> Flash write error %d has occured ...\n", res);
      printf(">> Please unplug the device and restart the program.\n");
      return EXIT_FAILURE;
    }
  }

  if (run) {

    printf("> Starting the user app ...\n");
    setProgressData("running", 6);
    printProgress(0.0);

    res = micronucleus_startApp(my_device);

    if (res != 0) {
      printf(">> Run error %d has occured ...\n", res);
      printf(">> Please unplug the device and restart the program. \n");
      return EXIT_FAILURE;
    }

    printProgress(1.0);
  }

  printf(">> Micronucleus done. Thank you!\n");

  return EXIT_SUCCESS;
}
/******************************************************************************/

/******************************************************************************/
static void printProgress(float progress) {
  static int last_step;
  static int last_integer_total_progress;

  if (dump_progress) {
    printf("{status:\"%s\",step:%d,steps:%d,progress:%f}\n", progress_friendly_name, progress_step, progress_total_steps, progress);
  } else {
    if (last_step == progress_step && use_ansi) {
      #ifndef WIN
        printf("\033[1F\033[2K"); // move cursor to previous line and erase last update in this progress sequence
      #else
        printf("\r"); // return carriage to start of line so we can type over existing text
      #endif
    }

    float total_progress = ((float) progress_step - 1.0f) / (float) progress_total_steps;
    total_progress += progress / (float) progress_total_steps;
    int integer_total_progress = total_progress * 100.0f;

    if (use_ansi || integer_total_progress >= last_integer_total_progress + 5) {
      printf("%s: %d%% complete\n", progress_friendly_name, integer_total_progress);
      last_integer_total_progress = integer_total_progress;
    }
  }

  last_step = progress_step;
}

static void setProgressData(char* friendly, int step) {
  progress_friendly_name = friendly;
  progress_step = step;
}
/******************************************************************************/

/******************************************************************************/
static int parseUntilColon(FILE *file_pointer) {
  int character;

  do {
    character = getc(file_pointer);
  } while(character != ':' && character != EOF);

  return character;
}
/******************************************************************************/

/******************************************************************************/
static int parseHex(FILE *file_pointer, int num_digits) {
  int iter;
  char temp[9];

  for(iter = 0; iter < num_digits; iter++) {
    temp[iter] = getc(file_pointer);
  }
  temp[iter] = 0;

  return strtol(temp, NULL, 16);
}
/******************************************************************************/

/******************************************************************************/
static int parseIntelHex(char *hexfile, unsigned char *buffer, int *startAddr, int *endAddr) {
  int address, base, d, segment, i, lineLen, sum;
  FILE *input;

  input = strcmp(hexfile, "-") == 0 ? stdin : fopen(hexfile, "r");
  if (input == NULL) {
    printf("> Error opening %s: %s\n", hexfile, strerror(errno));
    return 1;
  }

  while (parseUntilColon(input) == ':') {
    sum = 0;
    sum += lineLen = parseHex(input, 2);
    base = address = parseHex(input, 4);
    sum += address >> 8;
    sum += address;
    sum += segment = parseHex(input, 2);  /* segment value? */
    if (segment != 0) {   /* ignore lines where this byte is not 0 */
      continue;
    }

    for (i = 0; i < lineLen; i++) {
      d = parseHex(input, 2);
      buffer[address++] = d;
      sum += d;
    }

    sum += parseHex(input, 2);
    if ((sum & 0xff) != 0) {
      printf("> Warning: Checksum error between address 0x%x and 0x%x\n", base, address);
    }

    if(*startAddr > base) {
      *startAddr = base;
    }
    if(*endAddr < address) {
      *endAddr = address;
    }
  }

  fclose(input);
  return 0;
}
/******************************************************************************/

/******************************************************************************/
static int parseRaw(char *filename, unsigned char *data_buffer, int *start_address, int *end_address) {
  FILE *input;

  input = strcmp(filename, "-") == 0 ? stdin : fopen(filename, "r");

  if (input == NULL) {
    printf("> Error reading %s: %s\n", filename, strerror(errno));
    return 1;
  }

  *start_address = 0;
  *end_address = 0;

  // read in bytes from file
  int byte = 0;
  while (1) {
    byte = getc(input);
    if (byte == EOF) break;

    *data_buffer = byte;
    data_buffer += 1;
    *end_address += 1;
  }

  fclose(input);
  return 0;
}
/******************************************************************************/