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import time
import struct
import logging

try:
    import queue
except ImportError:
    import Queue as queue

from mdb.utils import compute_checksum, compute_chk, bcd_decode
from mdb.constants import *
from mdb.backend import RaspiBackend, DummyBackend, pigpio

class MDBRequest(object):
    timestamp = None
    data = None
    command = None
    processed = False

    def __init__(self, command):
        self.timestamp = time.time()
        self.command = command
        self.data = bytearray()

    def validate_checksum(self):
        if not self.data:
            return False

        try:
            if self.ack:
                if len(self.data) == 1 and self.processed:
                    return True # Only ACK

                return self.data[-2] == compute_checksum(self.command, self.data[:-2])
            else:
                return self.data[-1] == compute_checksum(self.command, self.data[:-1])
        except KeyboardInterrupt:
            raise
        except:
            logging.exception('Checksum validation failed for: %r %r', self.command, self.data)
            return False
    @property
    def ack(self):
        return self.data[-1] == 0x00

    def __repr__(self):
        return '<MDBRequest 0x%02x [%s] chk:%r>' % (
            self.command,
            ' '.join(['0x%02x' % b for b in self.data]),
            self.validate_checksum()
            )


class MDBDevice(object):
    current_request = None
    send_buffer = None

    def __init__(self, app=None):
        self.logger = logging.getLogger(type(self).__name__)
        self.poll_queue = queue.Queue()
        if pigpio:
            self.backend = RaspiBackend()
        else:
            self.logger.warning('Running with dummy backend device')
            self.backend = DummyBackend()

    def initialize(self):
        self.logger.info('Initializing...')
        self.backend.open()
        # here should IO / connection initizliation go

    def run(self):
        self.initialize()

        while True:
            data = self.backend.read()
            for b in range(0, len(data), 2):
                if data[b+1]:
                    if self.current_request: # and not self.current_request.processed:
                        self.logger.debug(self.current_request)
                        if self.current_request.processed and self.current_request.ack:
                            self.logger.info('Got response: %d',self.current_request.data[-1])

                    self.current_request = MDBRequest(data[b])
                    self.send_buffer = None
                elif self.current_request:
                    if self.current_request.processed and data[b] == 0xaa and self.send_buffer:
                        self.logger.warning('Received RETRANSMIT %r %r', self.current_request, self.send_buffer)
                        #self.send(self.send_buffer, checksum=False)
                    else:
                        self.current_request.data.append(data[b])
                else:
                    self.logger.warning('Received unexpected data: 0x%02x', data[b])

                if self.current_request and not self.current_request.processed:
                    try:
                        resp = self.process_request(self.current_request)

                        if resp is not None and not self.current_request.processed:
                            self.current_request.processed = True
                            self.send(resp)
                    except KeyboardInterrupt:
                        raise
                    except:
                        self.logger.exception('Request process failed!')

    def send(self, data, checksum=True):
        data = list(data)
        if checksum:
            data.append(0x100 | compute_chk(data))

        msg = struct.pack('<%dh' % len(data), *data)

        self.send_buffer = data

        self.logger.debug('>> [%d bytes] %s', len(data), ' '.join(['0x%02x' % b for b in data]))

        self.backend.write(msg)

    def process_request(self, req):
        # Unimplemented...
        return

#
# This is mostly working cashless device implementation
#

class CashlessMDBDevice(MDBDevice):
    base_address = CASHLESS_RESET
    state = 'IDLE'
    last_poll = 0
    config_data = [
        0x01, # Feature level
        0x19, 0x85, # PLN x---DD
        1, # scaling factor
        0x00, # decimal places factor
        10, # 10s response time
        0x00, # misc options...
        ]

    manufacturer = 'GMD'
    serial_number = '123456789012'
    model_number = '123456789012'
    software_version = (0x21, 0x37)

    def process_request(self, req):
        if (req.command & self.base_address) != self.base_address:
            # Target mismatch
            return

        if not req.validate_checksum():
            # Invalid checksum
            return

        if req.command == CASHLESS_RESET:
            self.state = 'RESET'
            self.logger.info('RESET: Device reset')
            self.poll_queue.put([0x00])

            return []

        elif req.command == CASHLESS_POLL:
            self.last_poll = time.time()
            try:
                msg = self.poll_queue.get_nowait()
                self.logger.info('Sending POLL response: %r', msg)
                return msg
            except queue.Empty:
                return []

        elif req.command == CASHLESS_VEND:
            if req.data[0] == 0x00: # vend request
                self.logger.info('VEND: request %r', req)
                value, product_bcd = struct.unpack('>xhhx', req.data)
                product = bcd_decode(product_bcd)
                self.logger.info('VEND: requested %d for %d', product, value)
                if self.vend_request(product, value):
                    # accept. two latter bytes are value subtracted from balance
                    # displayed after purchase FIXME
                    return [0x05, 0x00, 0xff]
                else:
                    # welp?
                    return [0x06]

            elif req.data[0] == 0x01: # vend cancel
                self.logger.info('VEND: cancel')
                return [0x06] # deny == ok

            elif req.data[0] == 0x02: # vend succ
                self.logger.info('VEND: success %r', req)
                return []

            elif req.data[0] == 0x03:
                self.logger.info('VEND: failure')
                return []

            elif req.data[0] == 0x04:
                self.logger.info('VEND: session complete %r', req)
                self.state = 'OK'
                return [0x07]

            elif req.data[0] == 0x05:
                self.logger.info('VEND: cash sale')
                return []

            elif req.data[0] == 0x06:
                self.logger.info('VEND: negative vend request')
                return [0x06] # deny
            else:
                self.logger.warning('VEND: unknown command %r', req)

        elif req.command == CASHLESS_EXP and req.data[0] == CASHLESS_EXP_ID:
            self.logger.info('EXP_ID request: %r', req)
            return (
                bytearray([0x09]) + # peripheral ID
                bytearray(self.manufacturer.rjust(3, ' ').encode('ascii')) +
                bytearray(self.serial_number.rjust(12, '0').encode('ascii')) +
                bytearray(self.model_number.rjust(12, '0').encode('ascii')) +
                bytearray(self.software_version)
                )

        elif req.command == CASHLESS_SETUP and req.data[0] == 0x00 and len(req.data) == 6:
            vmc_level, disp_cols, disp_rows, disp_info = req.data[1:-1]

            self.logger.info('SETUP config')
            self.logger.info('  -> VMC level: %d', vmc_level)
            self.logger.info('  -> Disp cols: %d', disp_cols)
            self.logger.info('  -> Disp rows: %d', disp_rows)
            self.logger.info('  -> Disp info: %d', disp_info)

            self.state = 'OK'

            return [0x01] + self.config_data

        elif req.command == CASHLESS_SETUP and req.data[0] == 0x01:
            self.logger.info('SETUP max/min price: %r', req)
            return []

        elif req.command == CASHLESS_READER:
            self.logger.info('READER update: %r', req.data[0])
            return []

    def begin_session(self, amount):
        # Begins new session with balance provided
        if amount > 65535:
            amount = 65535

        self.poll_queue.put([0x03, (amount >> 8) & 0xff, amount & 0xff])

    def cancel_session(self):
        # Cancels current session
        self.poll_queue.put([0x04])

    def vend_request(self, product, value):
        # Called when user selects a product
        return True

    @property
    def online(self):
        return time.time() - self.last_poll < 5


#
# This is mostly unfinished Bill validator implementation
#

class BillMDBDevice(MDBDevice):
    scaling_factor = 50

    bills = [
        50, 100, 200, 500, 1000, 2000, 5000, 10000,
        0, 0, 0, 0, 0, 0, 0, 0,
        ]

    feed_bills = []

    def feed_amount(self, amount):
        if amount % self.scaling_factor:
            raise Exception('Invalid amount')

        while amount > 0:
            bills_list = filter(lambda v: v <= amount, self.bills)
            bills_list.sort()

            self.feed_bills.append(self.bills.index(bills_list[-1]))
            amount -= bills_list[-1]