# -*- coding: utf-8 -*-
#
# SPDX-License-Identifier: MIT
"""Driver for FreeStyle InsuLinx devices.

Supported features:
    - get readings;
    - get and set date and time;
    - get serial number and software version.

Expected device path: /dev/hidraw9 or similar HID device. Optional when using
HIDAPI.

WARNING: currently untested! Based off reverse engineering notes provided by
Xavier Claessens.

"""

import collections
import datetime

from glucometerutils import common
from glucometerutils.support import freestyle

# The type is a string because it precedes the parsing of the object.
_TYPE_GLUCOSE_READING = "0"

_InsulinxReading = collections.namedtuple(
    "_InsulinxReading",
    (
        "type",  # 0 = blood glucose
        "id",
        "month",
        "day",
        "year",  # year is two-digits
        "hour",
        "minute",
        "unknown1",
        "unknown2",
        "unknown3",
        "unknown4",
        "unknown5",
        "unknown6",
        "value",
        "unknown7",
        "unknown8",
    ),
)


class Device(freestyle.FreeStyleHidDevice):
    """Glucometer driver for FreeStyle InsuLinux devices."""

    USB_PRODUCT_ID = 0x3460

    def get_meter_info(self):
        """Return the device information in structured form."""
        return common.MeterInfo(
            "FreeStyle InsuLinx",
            serial_number=self.get_serial_number(),
            version_info=("Software version: " + self._get_version(),),
            native_unit=self.get_glucose_unit(),
        )

    def get_glucose_unit(self):  # pylint: disable=no-self-use
        """Returns the glucose unit of the device."""
        return common.Unit.MG_DL

    def get_readings(self):
        """Iterate through the reading records in the device."""
        for record in self._get_multirecord(b"$result?"):
            if not record or record[0] != _TYPE_GLUCOSE_READING:
                continue

            # Build a reading object by parsing each of the entries in the CSV
            # as integers.
            raw_reading = _InsulinxReading._make([int(v) for v in record])

            timestamp = datetime.datetime(
                raw_reading.year + 2000,
                raw_reading.month,
                raw_reading.day,
                raw_reading.hour,
                raw_reading.minute,
            )

            yield common.GlucoseReading(timestamp, raw_reading.value)

    def zero_log(self):
        raise NotImplementedError