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

# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
# Copyright (C) 2015 Red Hat, 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.name


class URI(dns.rdata.Rdata):

    """URI record"""

    # see RFC 7553

    __slots__ = ['priority', 'weight', 'target']

    def __init__(self, rdclass, rdtype, priority, weight, target):
        super().__init__(rdclass, rdtype)
        object.__setattr__(self, 'priority', priority)
        object.__setattr__(self, 'weight', weight)
        if len(target) < 1:
            raise dns.exception.SyntaxError("URI target cannot be empty")
        if isinstance(target, str):
            object.__setattr__(self, 'target', target.encode())
        else:
            object.__setattr__(self, 'target', target)

    def to_text(self, origin=None, relativize=True, **kw):
        return '%d %d "%s"' % (self.priority, self.weight,
                               self.target.decode())

    @classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True,
                  relativize_to=None):
        priority = tok.get_uint16()
        weight = tok.get_uint16()
        target = tok.get().unescape()
        if not (target.is_quoted_string() or target.is_identifier()):
            raise dns.exception.SyntaxError("URI target must be a string")
        tok.get_eol()
        return cls(rdclass, rdtype, priority, weight, target.value)

    def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
        two_ints = struct.pack("!HH", self.priority, self.weight)
        file.write(two_ints)
        file.write(self.target)

    @classmethod
    def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
        (priority, weight) = parser.get_struct('!HH')
        target = parser.get_remaining()
        if len(target) == 0:
            raise dns.exception.FormError('URI target may not be empty')
        return cls(rdclass, rdtype, priority, weight, target)