# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import struct

import dns.exception
import dns.rdata
import dns.tokenizer


def _validate_float_string(what):
    if len(what) == 0:
        raise dns.exception.FormError
    if what[0] == b'-'[0] or what[0] == b'+'[0]:
        what = what[1:]
    if what.isdigit():
        return
    try:
        (left, right) = what.split(b'.')
    except ValueError:
        raise dns.exception.FormError
    if left == b'' and right == b'':
        raise dns.exception.FormError
    if not left == b'' and not left.decode().isdigit():
        raise dns.exception.FormError
    if not right == b'' and not right.decode().isdigit():
        raise dns.exception.FormError


def _sanitize(value):
    if isinstance(value, str):
        return value.encode()
    return value


class GPOS(dns.rdata.Rdata):

    """GPOS record"""

    # see: RFC 1712

    __slots__ = ['latitude', 'longitude', 'altitude']

    def __init__(self, rdclass, rdtype, latitude, longitude, altitude):
        super().__init__(rdclass, rdtype)
        if isinstance(latitude, float) or \
           isinstance(latitude, int):
            latitude = str(latitude)
        if isinstance(longitude, float) or \
           isinstance(longitude, int):
            longitude = str(longitude)
        if isinstance(altitude, float) or \
           isinstance(altitude, int):
            altitude = str(altitude)
        latitude = _sanitize(latitude)
        longitude = _sanitize(longitude)
        altitude = _sanitize(altitude)
        _validate_float_string(latitude)
        _validate_float_string(longitude)
        _validate_float_string(altitude)
        object.__setattr__(self, 'latitude', latitude)
        object.__setattr__(self, 'longitude', longitude)
        object.__setattr__(self, 'altitude', altitude)
        flat = self.float_latitude
        if flat < -90.0 or flat > 90.0:
            raise dns.exception.FormError('bad latitude')
        flong = self.float_longitude
        if flong < -180.0 or flong > 180.0:
            raise dns.exception.FormError('bad longitude')

    def to_text(self, origin=None, relativize=True, **kw):
        return '{} {} {}'.format(self.latitude.decode(),
                                 self.longitude.decode(),
                                 self.altitude.decode())

    @classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True,
                  relativize_to=None):
        latitude = tok.get_string()
        longitude = tok.get_string()
        altitude = tok.get_string()
        tok.get_eol()
        return cls(rdclass, rdtype, latitude, longitude, altitude)

    def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
        l = len(self.latitude)
        assert l < 256
        file.write(struct.pack('!B', l))
        file.write(self.latitude)
        l = len(self.longitude)
        assert l < 256
        file.write(struct.pack('!B', l))
        file.write(self.longitude)
        l = len(self.altitude)
        assert l < 256
        file.write(struct.pack('!B', l))
        file.write(self.altitude)

    @classmethod
    def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
        latitude = parser.get_counted_bytes()
        longitude = parser.get_counted_bytes()
        altitude = parser.get_counted_bytes()
        return cls(rdclass, rdtype, latitude, longitude, altitude)

    @property
    def float_latitude(self):
        "latitude as a floating point value"
        return float(self.latitude)

    @property
    def float_longitude(self):
        "longitude as a floating point value"
        return float(self.longitude)

    @property
    def float_altitude(self):
        "altitude as a floating point value"
        return float(self.altitude)