cimport qmsk.net.libc as libc
cimport qmsk.net.py as py

cdef class sockaddr_in6 (sockaddr) :

    def __init__ (self, object addr=None, platform.in_port_t port=0, unsigned int scope_id = 0) :
        """
            Construct using given literal IPv6 address and TCP/UDP port

                addr        - IPv6 address, defaults to platform.in6addr_any (::)
                port        - TCP/UDP port, defaults to 0 (ephemeral)
                scope_id    - (optional) scope ID representing interface index for link-local addresses
        """

        # zero
        libc.memset(&self.sockaddr, 0, sizeof(self.sockaddr))

        # store our family
        # XXX: this should be a class attribute...
        self._init_family(platform.AF_INET6)

        # constant af
        self.sockaddr.sin6_family = self.family
        
        # set the sin_port
        self.sockaddr.sin6_port = platform.htons(port)
        
        if addr :
            # set the sin_addr
            # this automatically converts the addr from str -> char *
            platform.inet_pton(self.family, addr, &self.sockaddr.sin6_addr)

        else :
            # set as INADDR_ANY
            self.sockaddr.sin6_addr = platform.in6addr_any

        # scope ID
        self.sockaddr.sin6_scope_id = scope_id

    cdef int _get_sockaddr (self, platform.sockaddr **sa_ptr, platform.socklen_t *sa_len) except -1 :
        if sa_ptr :
            sa_ptr[0] = <platform.sockaddr *> &self.sockaddr

        if sa_len :
            sa_len[0] = sizeof(self.sockaddr)

        return 0

    cdef int _set_sockaddr (self, platform.sockaddr *sa, size_t sa_len) except -1 :
        assert sa_len == sizeof(self.sockaddr)

        libc.memcpy(&self.sockaddr, sa, sa_len)

    property port :
        """
            The integer port number.

            This will represent it correctly in host byte order.

            >>> sockaddr_in6(port=1234).port
            1234
        """

        def __get__ (self) :
            return platform.ntohs(self.sockaddr.sin6_port)


    property flowinfo :
        """
            The integer flowinfo

            XXX: byteorder?
            
            >>> sockaddr_in6().flowinfo
            0
        """

        def __get__ (self) :
            return self.sockaddr.sin6_flowinfo


    property scope_id :
        """
            The scope ID - corresponds to an interface index for link-scope addresses.

            This should be in host byte order...

            >>> sockaddr_in6(scope_id=1337).scope_id
            1337
        """

        def __get__ (self) :
            return self.sockaddr.sin6_scope_id

    def __cmp__ (self, other_obj) :
        """
            A sockaddr_in6 is equal to any other sockaddr_in6 which has the same addr, port and scope ID.

            XXX: flowinfo?

            XXX: A sockaddr_in6 is also equal to a sockaddr_in if the sockaddr_in6 represents the given v4-mapped address.
            
            >>> assert sockaddr_in6() == sockaddr_in6()
            >>> assert sockaddr_in6('0:0:0::1', 80) == sockaddr_in6('::1', 80)
            >>> assert sockaddr_in6('::127.0.0.1') == sockaddr_in('127.0.0.1')
        """

        if not isinstance(other_obj, sockaddr_in6) :
            return <object> py.Py_NotImplemented

        cdef sockaddr_in6 other = other_obj
        cdef platform.sockaddr_in6 *sa1 = &self.sockaddr, *sa2 = &other.sockaddr

        if other is self :
            return 0

        return (
                libc.memcmp(<void *> &sa1.sin6_port,        <void *> &sa2.sin6_port,        sizeof(sa1.sin6_port))
            or  libc.memcmp(<void *> &sa1.sin6_addr,        <void *> &sa2.sin6_addr,        sizeof(sa1.sin6_addr))
            or  libc.memcmp(<void *> &sa1.sin6_scope_id,    <void *> &sa2.sin6_scope_id,    sizeof(sa1.sin6_scope_id))
        )

    def __str__ (self) :
        """
            Return the literal ASCII representation for this sockaddr as a '[<addr>]:<port> string

            >>> str(sockaddr_in6())
            '[::]:0'

            >>> str(sockaddr_in6('2001:0::05:1'))
            '[2001::5:1]'

            >>> str(sockaddr_in6('fe80::abcd', scope_id=5))
            '[fe80::abcd%5]'
        """

        addr, port = self.getnameinfo()
        scope_id = self.scope_id

        # format with scope_id
        return "[%s%s]:%s" % (
            addr,
            "%%%d" % scope_id if scope_id else "",
            port
        )