# The MIT License (MIT)
#
# Copyright (c) 2019 Dan Halbert for Adafruit Industries
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""
`adafruit_bluefruit_connect.location_packet`
====================================================

Bluefruit Connect App geographical location packet.

* Author(s): Dan Halbert for Adafruit Industries

"""

import struct

from .packet import Packet

class LocationPacket(Packet):
    """A packet of latitude, longitude, and altitude values."""

    _FMT_PARSE = '<xxfffx'
    PACKET_LENGTH = struct.calcsize(_FMT_PARSE)
    # _FMT_CONSTRUCT doesn't include the trailing checksum byte.
    _FMT_CONSTRUCT = '<2sfff'
    PACKET_LENGTH = struct.calcsize(_FMT_CONSTRUCT)
    _TYPE_HEADER = b'!L'

    def __init__(self, latitude, longitude, altitude):
        """Construct a LocationPacket from the given values."""
        self._latitude = latitude
        self._longitude = longitude
        self._altitude = altitude

    def to_bytes(self):
        """Return the bytes needed to send this packet.
        """
        partial_packet = struct.pack(self._FMT_CONSTRUCT, self._TYPE_HEADER,
                                     self._latitude, self._longitude, self._altitude)
        return self.add_checksum(partial_packet)

    @property
    def latitude(self):
        """The latitude value."""
        return self._latitude

    @property
    def longitude(self):
        """The longitude value."""
        return self._longitude

    @property
    def altitude(self):
        """The altitude value."""
        return self._altitude

# Register this class with the superclass. This allows the user to import only what is needed.
LocationPacket.register_packet_type()
