#!/usr/bin/python
# Author: Jon Trulson <jtrulson@ics.com>
# Copyright (c) 2015 Intel Corporation.
#
# 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.

import time, sys, signal, atexit
import pyupm_pn532 as upmPn532

# Instantiate an PN532 on I2C bus 0 (default) using gpio 3 for the
# IRQ, and gpio 2 for the reset pin.
myNFC = upmPn532.PN532(3, 2)

## Exit handlers ##
# This stops python from printing a stacktrace when you hit control-C
def SIGINTHandler(signum, frame):
	raise SystemExit

# This lets you run code on exit
def exitHandler():
	print "Exiting"
	sys.exit(0)

# Register exit handlers
atexit.register(exitHandler)
signal.signal(signal.SIGINT, SIGINTHandler)


if (not myNFC.init()):
	print "init() failed"
	sys.exit(0)

vers = myNFC.getFirmwareVersion()

if (vers):
	print "Got firmware version: %08x" % vers
else:
	print "Could not identify PN532"
	sys.exit(0)

# Now scan and identify any cards that come in range (1 for now)

# Retry forever
myNFC.setPassiveActivationRetries(0xff)

myNFC.SAMConfig()

uidSize = upmPn532.uint8Array(0)
uid = upmPn532.uint8Array(7)

# the URL we want to add as an NDEF record
# NOTE: this cannot exceed 34 characters.
url = "iotdk.intel.com"

foundCard = False

while (not foundCard):
	for i in range(7):
		uid.__setitem__(i, 0)
	if (myNFC.readPassiveTargetID(upmPn532.PN532.BAUD_MIFARE_ISO14443A,
                                      uid, uidSize, 2000)):
		# found a card
		print "Found a card: UID len", uidSize.__getitem__(0)
		print "UID: ",
		for i in range(uidSize.__getitem__(0)):
			print "%02x" % uid.__getitem__(i),
		print
		print "SAK: %02x" % myNFC.getSAK()
		print "ATQA: %04x" % myNFC.getATQA()
                print
                foundCard = True
	else:
		print "Waiting for a card...\n"

if (uidSize.__getitem__(0) != 7):
        print "This example will only write an NDEF URI to preformatted"
        print "Mifare Ultralight or NTAG2XX tags"
        sys.exit(1)

# 48 bytes is maximum data area on ultralight cards, so we use that
# as the maximum datasize here.  Obviously if you have a bigger
# card, you can write more data.
if (not myNFC.ntag2xx_WriteNDEFURI(upmPn532.PN532.NDEF_URIPREFIX_HTTP, url, 48)):
        # failure
        print "Failed to write NDEF record tag."
        sys.exit(1)

print "Success, URL record written to tag."