'''bossac-specific runner (flash only) for Atmel SAM microcontrollers.'''

import os
import platform

from runners.core import ZephyrBinaryRunner, RunnerCaps, BuildConfiguration

DEFAULT_BOSSAC_PORT = '/dev/ttyACM0'


class BossacBinaryRunner(ZephyrBinaryRunner):
    '''Runner front-end for bossac.'''

    def __init__(self, cfg, bossac='bossac', port=DEFAULT_BOSSAC_PORT,
            offset=0):
        super(BossacBinaryRunner, self).__init__(cfg)
        self.bossac = bossac
        self.port = port
        self.offset = offset

    @classmethod
    def name(cls):
        return 'bossac'

    @classmethod
    def capabilities(cls):
        return RunnerCaps(commands={'flash'})

    @classmethod
    def do_add_parser(cls, parser):
        parser.add_argument('--bossac', default='bossac',
                            help='path to bossac, default is bossac')
        parser.add_argument('--offset', default=0,
                            help='start erase/write/read/verify operation '
                                 'at flash OFFSET; OFFSET must be aligned '
                                 ' to a flash page boundary')
        parser.add_argument('--bossac-port', default='/dev/ttyACM0',
                            help='serial port to use, default is /dev/ttyACM0')

    @classmethod
    def create(cls, cfg, args):
        return BossacBinaryRunner(cfg, bossac=args.bossac,
                                  port=args.bossac_port, offset=args.offset)

    def do_run(self, command, **kwargs):
        if platform.system() != 'Linux':
            msg = 'CAUTION: No flash tool for your host system found!'
            raise NotImplementedError(msg)

        cmd_stty = ['stty', '-F', self.port, 'raw', 'ispeed', '1200',
                    'ospeed', '1200', 'cs8', '-cstopb', 'ignpar', 'eol', '255',
                    'eof', '255']
        cmd_flash = [self.bossac, '-p', self.port, '-R', '-e', '-w', '-v',
                     '-o', '%s' % self.offset,
                     '-b', self.cfg.bin_file]

        self.check_call(cmd_stty)
        self.check_call(cmd_flash)
