//-----------------------------------------------------------------------------
// Copyright (C) 2009 Michael Gernoth <michael at gernoth.net>
// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Main binary
//-----------------------------------------------------------------------------

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include <readline/readline.h>
#include <readline/history.h>
//#include "proxusb.h"
#include "proxmark3.h"
#include "proxgui.h"
#include "cmdmain.h"
#include "uart.h"
#include "ui.h"
#include "sleep.h"
#include "cmdparser.h"
#include "cmdmain.h"

// a global mutex to prevent interlaced printing from different threads
pthread_mutex_t print_lock;

static serial_port sp;
static UsbCommand txcmd;
volatile static bool txcmd_pending = false;

void SendCommand(UsbCommand *c) {
#if 0
  printf("Sending %d bytes\n", sizeof(UsbCommand));
#endif
/*
  if (txcmd_pending) {
    ERR("Sending command failed, previous command is still pending");
  }
*/
  if(offline)
    {
      PrintAndLog("Sending bytes to proxmark failed - offline");
      return;
    }

	/**
	The while-loop below causes hangups at times, when the pm3 unit is unresponsive
	or disconnected. The main console thread is alive, but comm thread just spins here.
	Not good.../holiman
	**/
  while(txcmd_pending);
  txcmd = *c;
  txcmd_pending = true;
}

struct receiver_arg {
  int run;
};

struct main_loop_arg {
  int usb_present;
  char *script_cmds_file;
};

byte_t rx[0x1000000];
byte_t* prx = rx;

static void *uart_receiver(void *targ) {
  struct receiver_arg *arg = (struct receiver_arg*)targ;
  size_t rxlen;
  size_t cmd_count;
  
  while (arg->run) {
    rxlen = sizeof(UsbCommand);
    if (uart_receive(sp,prx,&rxlen)) {
      prx += rxlen;
      if (((prx-rx) % sizeof(UsbCommand)) != 0) {
        continue;
      }
      cmd_count = (prx-rx) / sizeof(UsbCommand);
      //      printf("received %d bytes, which represents %d commands\n",(prx-rx), cmd_count);
      for (size_t i=0; i<cmd_count; i++) {
        UsbCommandReceived((UsbCommand*)(rx+(i*sizeof(UsbCommand))));
      }
    }
    prx = rx;
    
    if(txcmd_pending) {
      if (!uart_send(sp,(byte_t*)&txcmd,sizeof(UsbCommand))) {
        PrintAndLog("Sending bytes to proxmark failed");
      }
      txcmd_pending = false;
    }
  }
  
  pthread_exit(NULL);
  return NULL;
}

static void *main_loop(void *targ) {
  struct main_loop_arg *arg = (struct main_loop_arg*)targ;
  struct receiver_arg rarg;
  char *cmd = NULL;
  pthread_t reader_thread;
  
  if (arg->usb_present == 1) {
    rarg.run=1;
    // pthread_create(&reader_thread, NULL, &usb_receiver, &rarg);
    pthread_create(&reader_thread, NULL, &uart_receiver, &rarg);
  }
  
  FILE *script_file = NULL;
  char script_cmd_buf[256];
  
  if (arg->script_cmds_file)
  {
    script_file = fopen(arg->script_cmds_file, "r");
    if (script_file)
    {
      printf("using 'scripting' commands file %s\n", arg->script_cmds_file);
    }
  }

	read_history(".history");
	while(1)
  {
    // If there is a script file
    if (script_file)
    {
      if (!fgets(script_cmd_buf, sizeof(script_cmd_buf), script_file))
      {
        fclose(script_file);
        script_file = NULL;
      }
      else
      {
        char *nl;
        nl = strrchr(script_cmd_buf, '\r');
        if (nl) *nl = '\0';
        nl = strrchr(script_cmd_buf, '\n');
        if (nl) *nl = '\0';
        
        if ((cmd = (char*) malloc(strlen(script_cmd_buf) + 1)) != NULL)
        {
          memset(cmd, 0, strlen(script_cmd_buf));
          strcpy(cmd, script_cmd_buf);
          printf("%s\n", cmd);
        }
      }
    }
		
		if (!script_file)
		{
      cmd = readline(PROXPROMPT);
		}
		
		if (cmd) {
			while(cmd[strlen(cmd) - 1] == ' ')
        cmd[strlen(cmd) - 1] = 0x00;
			
			if (cmd[0] != 0x00) {
				if (strncmp(cmd, "quit", 4) == 0) {
					exit(0);
					break;
				}
				
				CommandReceived(cmd);
				add_history(cmd);
			}
			free(cmd);
		} else {
			printf("\n");
			break;
		}
	}
  
	write_history(".history");
  
  if (arg->usb_present == 1) {
    rarg.run = 0;
    pthread_join(reader_thread, NULL);
  }
  
  if (script_file)
  {
    fclose(script_file);
    script_file = NULL;
  }
  
  ExitGraphics();
  pthread_exit(NULL);
  return NULL;
}

static void dumpAllHelp(int markdown)
{
  printf("\n%sProxmark3 command dump%s\n\n",markdown?"# ":"",markdown?"":"\n======================");
  printf("Some commands are available only if a Proxmark is actually connected.%s\n",markdown?"  ":"");
  printf("Check column \"offline\" for their availability.\n");
  printf("\n");
  command_t *cmds = getTopLevelCommandTable();
  dumpCommandsRecursive(cmds, markdown);
}

int main(int argc, char* argv[]) {
	srand(time(0));
  
	if (argc < 2) {
		printf("syntax: %s <port>\n\n",argv[0]);
		printf("\tLinux example:'%s /dev/ttyACM0'\n\n", argv[0]);
		printf("help:   %s -h\n\n", argv[0]);
		printf("\tDump all interactive help at once\n");
		printf("markdown:   %s -m\n\n", argv[0]);
		printf("\tDump all interactive help at once in markdown syntax\n");
		return 1;
	}
	if (strcmp(argv[1], "-h") == 0) {
		printf("syntax: %s <port>\n\n",argv[0]);
		printf("\tLinux example:'%s /dev/ttyACM0'\n\n", argv[0]);
		dumpAllHelp(0);
		return 0;
	}
	if (strcmp(argv[1], "-m") == 0) {
		dumpAllHelp(1);
		return 0;
	}
	// Make sure to initialize
	struct main_loop_arg marg = {
		.usb_present = 0,
		.script_cmds_file = NULL
	};
	pthread_t main_loop_t;

  
	sp = uart_open(argv[1]);
	if (sp == INVALID_SERIAL_PORT) {
		printf("ERROR: invalid serial port\n");
		marg.usb_present = 0;
		offline = 1;
	} else if (sp == CLAIMED_SERIAL_PORT) {
		printf("ERROR: serial port is claimed by another process\n");
		marg.usb_present = 0;
		offline = 1;
	} else {
		marg.usb_present = 1;
		offline = 0;
	}

	// If the user passed the filename of the 'script' to execute, get it
	if (argc > 2 && argv[2]) {
		if (argv[2][0] == 'f' &&  //buzzy, if a word 'flush' passed, flush the output after every log entry.
			argv[2][1] == 'l' &&
			argv[2][2] == 'u' &&
			argv[2][3] == 's' &&
			argv[2][4] == 'h')
		{
			printf("Output will be flushed after every print.\n");
			flushAfterWrite = 1;
		}
		else
		marg.script_cmds_file = argv[2];
	}

	// create a mutex to avoid interlacing print commands from our different threads
	pthread_mutex_init(&print_lock, NULL);

	pthread_create(&main_loop_t, NULL, &main_loop, &marg);
	InitGraphics(argc, argv);

	MainGraphics();

	pthread_join(main_loop_t, NULL);

	// Clean up the port
	uart_close(sp);
  
	// clean up mutex
	pthread_mutex_destroy(&print_lock);
  
  return 0;
}