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import pvl.dhcp.config

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import pvl.hosts.host

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class HostDHCPError(pvl.hosts.host.HostError):

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    pass

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def dhcp_host_options (host, ethernet):

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    """

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    """

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    yield 'option', 'host-name', host.name

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    yield 'hardware', 'ethernet', ethernet

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    if host.ip:

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        yield 'fixed-address', str(host.ip)

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    if not host.boot:

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        next_server = filename = None

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    elif host.boot.startswith('/'):

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        next_server = None

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        filename = host.boot[1:]

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    elif host.boot.endswith(':'):

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        next_server = host.boot[:-1]

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        filename = None

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    elif ':' in host.boot :

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        next_server, filename = host.boot.split(':', 1)

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    else :

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        raise HostError(host, "invalid boot={host.boot}".format(host=host))

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    if next_server:

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        yield 'next-server', next_server

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    if filename:

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        yield 'filename', filename

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def dhcp_host (host):

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    """

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    """

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    if set(host.ethernet) == set([None]) :

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        host_fmt = "{host.name}"

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    elif host.ethernet :

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        host_fmt = "{host.name}-{index}"

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    else :

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        # nothing to be seen here

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        return

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    if host.owner :

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        comment = u"Owner: {host.owner}".format(host=host)

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    else:

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        comment = None

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    for index, ethernet in host.ethernet.iteritems() :

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        name = host_fmt.format(host=host, index=index)

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def dhcp_hosts (hosts):

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    """

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        Verifies that there are no dupliate hosts.

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    """

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    blocks = { }

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    for host in hosts:

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