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"""Acquire debugging information from usb hid devices

cli implementation of https://www.pjrc.com/teensy/hid_listen.html
"""
from pathlib import Path
from threading import Thread
from time import sleep, strftime

import hid
import usb.core

from milc import cli

LOG_COLOR = {
    'next': 0,
    'colors': [
        '{fg_blue}',
        '{fg_cyan}',
        '{fg_green}',
        '{fg_magenta}',
        '{fg_red}',
        '{fg_yellow}',
    ],
}

KNOWN_BOOTLOADERS = {
    # VID  ,  PID
    ('03EB', '2FEF'): 'atmel-dfu: ATmega16U2',
    ('03EB', '2FF0'): 'atmel-dfu: ATmega32U2',
    ('03EB', '2FF3'): 'atmel-dfu: ATmega16U4',
    ('03EB', '2FF4'): 'atmel-dfu: ATmega32U4',
    ('03EB', '2FF9'): 'atmel-dfu: AT90USB64',
    ('03EB', '2FFA'): 'atmel-dfu: AT90USB162',
    ('03EB', '2FFB'): 'atmel-dfu: AT90USB128',
    ('03EB', '6124'): 'Microchip SAM-BA',
    ('0483', 'DF11'): 'stm32-dfu: STM32 BOOTLOADER',
    ('16C0', '05DC'): 'usbasploader: USBaspLoader',
    ('16C0', '05DF'): 'bootloadhid: HIDBoot',
    ('16C0', '0478'): 'halfkay: Teensy Halfkay',
    ('1B4F', '9203'): 'caterina: Pro Micro 3.3V',
    ('1B4F', '9205'): 'caterina: Pro Micro 5V',
    ('1B4F', '9207'): 'caterina: LilyPadUSB',
    ('1C11', 'B007'): 'kiibohd: Kiibohd DFU Bootloader',
    ('1EAF', '0003'): 'stm32duino: Maple 003',
    ('1FFB', '0101'): 'caterina: Polou A-Star 32U4 Bootloader',
    ('2341', '0036'): 'caterina: Arduino Leonardo',
    ('2341', '0037'): 'caterina: Arduino Micro',
    ('239A', '000C'): 'caterina: Adafruit Feather 32U4',
    ('239A', '000D'): 'caterina: Adafruit ItsyBitsy 32U4 3v',
    ('239A', '000E'): 'caterina: Adafruit ItsyBitsy 32U4 5v',
    ('2A03', '0036'): 'caterina: Arduino Leonardo',
    ('2A03', '0037'): 'caterina: Arduino Micro',
    ('314B', '0106'): 'apm32-dfu: APM32 DFU ISP Mode',
    ('03EB', '2067'): 'qmk-hid: HID Bootloader',
    ('03EB', '2045'): 'lufa-ms: LUFA Mass Storage Bootloader'
}


class MonitorDevice(object):
    def __init__(self, hid_device, numeric):
        self.hid_device = hid_device
        self.numeric = numeric
        self.device = hid.Device(path=hid_device['path'])
        self.current_line = ''

        cli.log.info('Console Connected: %(color)s%(manufacturer_string)s %(product_string)s{style_reset_all} (%(color)s%(vendor_id)04X:%(product_id)04X:%(index)d{style_reset_all})', hid_device)

    def read(self, size, encoding='ascii', timeout=1):
        """Read size bytes from the device.
        """
        return self.device.read(size, timeout).decode(encoding)

    def read_line(self):
        """Read from the device's console until we get a \n.
        """
        while '\n' not in self.current_line:
            self.current_line += self.read(32).replace('\x00', '')

        lines = self.current_line.split('\n', 1)
        self.current_line = lines[1]

        return lines[0]

    def run_forever(self):
        while True:
            try:
                message = {**self.hid_device, 'text': self.read_line()}
                identifier = (int2hex(message['vendor_id']), int2hex(message['product_id'])) if self.numeric else (message['manufacturer_string'], message['product_string'])
                message['identifier'] = ':'.join(identifier)
                message['ts'] = '{style_dim}{fg_green}%s{style_reset_all} ' % (strftime(cli.config.general.datetime_fmt),) if cli.args.timestamp else ''

                cli.echo('%(ts)s%(color)s%(identifier)s:%(index)d{style_reset_all}: %(text)s' % message)

            except hid.HIDException:
                break


class FindDevices(object):
    def __init__(self, vid, pid, index, numeric):
        self.vid = vid
        self.pid = pid
        self.index = index
        self.numeric = numeric

    def run_forever(self):
        """Process messages from our queue in a loop.
        """
        live_devices = {}
        live_bootloaders = {}

        while True:
            try:
                for device in list(live_devices):
                    if not live_devices[device]['thread'].is_alive():
                        cli.log.info('Console Disconnected: %(color)s%(manufacturer_string)s %(product_string)s{style_reset_all} (%(color)s%(vendor_id)04X:%(product_id)04X:%(index)d{style_reset_all})', live_devices[device])
                        del live_devices[device]

                for device in self.find_devices():
                    if device['path'] not in live_devices:
                        device['color'] = LOG_COLOR['colors'][LOG_COLOR['next']]
                        LOG_COLOR['next'] = (LOG_COLOR['next'] + 1) % len(LOG_COLOR['colors'])
                        live_devices[device['path']] = device

                        try:
                            monitor = MonitorDevice(device, self.numeric)
                            device['thread'] = Thread(target=monitor.run_forever, daemon=True)

                            device['thread'].start()
                        except Exception as e:
                            device['e'] = e
                            device['e_name'] = e.__class__.__name__
                            cli.log.error("Could not connect to %(color)s%(manufacturer_string)s %(product_string)s{style_reset_all} (%(color)s:%(vendor_id)04X:%(product_id)04X:%(index)d): %(e_name)s: %(e)s", device)
                            if cli.config.general.verbose:
                                cli.log.exception(e)
                            del live_devices[device['path']]

                if cli.args.bootloaders:
                    for device in self.find_bootloaders():
                        if device.address in live_bootloaders:
                            live_bootloaders[device.address]._qmk_found = True
                        else:
                            name = KNOWN_BOOTLOADERS[(int2hex(device.idVendor), int2hex(device.idProduct))]
                            cli.log.info('Bootloader Connected: {style_bright}{fg_magenta}%s', name)
                            device._qmk_found = True
                            live_bootloaders[device.address] = device

                    for device in list(live_bootloaders):
                        if live_bootloaders[device]._qmk_found:
                            live_bootloaders[device]._qmk_found = False
                        else:
                            name = KNOWN_BOOTLOADERS[(int2hex(live_bootloaders[device].idVendor), int2hex(live_bootloaders[device].idProduct))]
                            cli.log.info('Bootloader Disconnected: {style_bright}{fg_magenta}%s', name)
                            del live_bootloaders[device]

                sleep(.1)

            except KeyboardInterrupt:
                break

    def is_bootloader(self, hid_device):
        """Returns true if the device in question matches a known bootloader vid/pid.
        """
        return (int2hex(hid_device.idVendor), int2hex(hid_device.idProduct)) in KNOWN_BOOTLOADERS

    def is_console_hid(self, hid_device):
        """Returns true when the usage page indicates it's a teensy-style console.
        """
        return hid_device['usage_page'] == 0xFF31 and hid_device['usage'] == 0x0074

    def is_filtered_device(self, hid_device):
        """Returns True if the device should be included in the list of available consoles.
        """
        return int2hex(hid_device['vendor_id']) == self.vid and int2hex(hid_device['product_id']) == self.pid

    def find_devices_by_report(self, hid_devices):
        """Returns a list of available teensy-style consoles by doing a brute-force search.

        Some versions of linux don't report usage and usage_page. In that case we fallback to reading the report (possibly inaccurately) ourselves.
        """
        devices = []

        for device in hid_devices:
            path = device['path'].decode('utf-8')

            if path.startswith('/dev/hidraw'):
                number = path[11:]
                report = Path(f'/sys/class/hidraw/hidraw{number}/device/report_descriptor')

                if report.exists():
                    rp = report.read_bytes()

                    if rp[1] == 0x31 and rp[3] == 0x09:
                        devices.append(device)

        return devices

    def find_bootloaders(self):
        """Returns a list of available bootloader devices.
        """
        return list(filter(self.is_bootloader, usb.core.find(find_all=True)))

    def find_devices(self):
        """Returns a list of available teensy-style consoles.
        """
        hid_devices = hid.enumerate()
        devices = list(filter(self.is_console_hid, hid_devices))

        if not devices:
            devices = self.find_devices_by_report(hid_devices)

        if self.vid and self.pid:
            devices = list(filter(self.is_filtered_device, devices))

        # Add index numbers
        device_index = {}
        for device in devices:
            id = ':'.join((int2hex(device['vendor_id']), int2hex(device['product_id'])))

            if id not in device_index:
                device_index[id] = 0

            device_index[id] += 1
            device['index'] = device_index[id]

        return devices


def int2hex(number):
    """Returns a string representation of the number as hex.
    """
    return "%04X" % number


def list_devices(device_finder):
    """Show the user a nicely formatted list of devices.
    """
    devices = device_finder.find_devices()

    if devices:
        cli.log.info('Available devices:')
        for dev in devices:
            color = LOG_COLOR['colors'][LOG_COLOR['next']]
            LOG_COLOR['next'] = (LOG_COLOR['next'] + 1) % len(LOG_COLOR['colors'])
            cli.log.info("\t%s%s:%s:%d{style_reset_all}\t%s %s", color, int2hex(dev['vendor_id']), int2hex(dev['product_id']), dev['index'], dev['manufacturer_string'], dev['product_string'])

    if cli.args.bootloaders:
        bootloaders = device_finder.find_bootloaders()

        if bootloaders:
            cli.log.info('Available Bootloaders:')

            for dev in bootloaders:
                cli.log.info("\t%s:%s\t%s", int2hex(dev.idVendor), int2hex(dev.idProduct), KNOWN_BOOTLOADERS[(int2hex(dev.idVendor), int2hex(dev.idProduct))])


@cli.argument('--bootloaders', arg_only=True, default=True, action='store_boolean', help='displaying bootloaders.')
@cli.argument('-d', '--device', help='Device to select - uses format <pid>:<vid>[:<index>].')
@cli.argument('-l', '--list', arg_only=True, action='store_true', help='List available hid_listen devices.')
@cli.argument('-n', '--numeric', arg_only=True, action='store_true', help='Show VID/PID instead of names.')
@cli.argument('-t', '--timestamp', arg_only=True, action='store_true', help='Print the timestamp for received messages as well.')
@cli.argument('-w', '--wait', type=int, default=1, help="How many seconds to wait between checks (Default: 1)")
@cli.subcommand('Acquire debugging information from usb hid devices.', hidden=False if cli.config.user.developer else True)
def console(cli):
    """Acquire debugging information from usb hid devices
    """
    vid = None
    pid = None
    index = 1

    if cli.config.console.device:
        device = cli.config.console.device.split(':')

        if len(device) == 2:
            vid, pid = device

        elif len(device) == 3:
            vid, pid, index = device

            if not index.isdigit():
                cli.log.error('Device index must be a number! Got "%s" instead.', index)
                exit(1)

            index = int(index)

            if index < 1:
                cli.log.error('Device index must be greater than 0! Got %s', index)
                exit(1)

        else:
            cli.log.error('Invalid format for device, expected "<pid>:<vid>[:<index>]" but got "%s".', cli.config.console.device)
            cli.print_help()
            exit(1)

        vid = vid.upper()
        pid = pid.upper()

    device_finder = FindDevices(vid, pid, index, cli.args.numeric)

    if cli.args.list:
        return list_devices(device_finder)

    print('Looking for devices...', flush=True)
    device_finder.run_forever()