from kivy.utils import platform
if platform != 'android':
    raise ImportError

from electrum_gui.kivy.nfc_scanner import NFCBase
from jnius import autoclass, cast
from android.runnable import run_on_ui_thread
from android import activity

NfcAdapter = autoclass('android.nfc.NfcAdapter')
PythonActivity = autoclass('org.renpy.android.PythonActivity')
Intent = autoclass('android.content.Intent')
IntentFilter = autoclass('android.content.IntentFilter')
PendingIntent = autoclass('android.app.PendingIntent')
NdefRecord = autoclass('android.nfc.NdefRecord')
NdefMessage = autoclass('android.nfc.NdefMessage')

class ScannerAndroid(NFCBase):

    def nfc_init(self):
        # print 'nfc_init()'

        # print 'configure nfc'
        self.j_context = context = PythonActivity.mActivity
        self.nfc_adapter = NfcAdapter.getDefaultAdapter(context)
        self.nfc_pending_intent = PendingIntent.getActivity(context, 0,
            Intent(context, context.getClass()).addFlags(
                Intent.FLAG_ACTIVITY_SINGLE_TOP), 0)

        # print 'p2p filter'
        self.ndef_detected = IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED)
        self.ndef_detected.addDataType('text/plain')
        self.ndef_exchange_filters = [self.ndef_detected]

    def on_new_intent(self, intent):
        # print 'on_new_intent()', intent.getAction()
        if intent.getAction() != NfcAdapter.ACTION_NDEF_DISCOVERED:
            # print 'unknow action, avoid.'
            return

        rawmsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES)
        # print 'raw messages', rawmsgs
        if not rawmsgs:
            return

        for message in rawmsgs:
            message = cast(NdefMessage, message)
            # print 'got message', message
            payload = message.getRecords()[0].getPayload()
            self.payload = payload
            print 'payload: {}'.format(''.join(map(chr, payload)))

    def nfc_disable(self):
        # print 'nfc_enable()'
        activity.bind(on_new_intent=self.on_new_intent)

    def nfc_enable(self):
        # print 'nfc_enable()'
        activity.bind(on_new_intent=self.on_new_intent)

    @run_on_ui_thread
    def _nfc_enable_ndef_exchange(self, data):
        # print 'create record'
        ndef_record = NdefRecord(
                NdefRecord.TNF_MIME_MEDIA,
                'text/plain', '', data)
        # print 'create message'
        ndef_message = NdefMessage([ndef_record])

        # print 'enable ndef push'
        self.nfc_adapter.enableForegroundNdefPush(self.j_context, ndef_message)

        # print 'enable dispatch', self.j_context, self.nfc_pending_intent
        self.nfc_adapter.enableForegroundDispatch(self.j_context,
                self.nfc_pending_intent, self.ndef_exchange_filters, [])

    @run_on_ui_thread
    def _nfc_disable_ndef_exchange(self):
        self.nfc_adapter.disableForegroundNdefPush(self.j_context)
        self.nfc_adapter.disableForegroundDispatch(self.j_context)

    def nfc_enable_exchange(self, data):
        self._nfc_enable_ndef_exchange()

    def nfc_disable_exchange(self):
        self._nfc_disable_ndef_exchange()