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import optparse, sys

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from pvl.syslog.parser import SyslogParser

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from pvl.syslog.filter import SyslogFilter

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from pvl.syslog.syslog import SyslogSource

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from pvl.syslog import fifo, tail

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# XXX: use optparse parser.error()?

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import logging; log = logging.getLogger('pvl.syslog.args')

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def parser (parser, prog=None) :

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    """

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        Optparse option group

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            prog        - filter to only process lines from given process

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    """

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    syslog = optparse.OptionGroup(parser, 'Syslog collector')

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    syslog.add_option('--syslog-fifo',          metavar='PATH',

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            help="Read syslog messages from given fifo")

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    syslog.add_option('--syslog-file',          metavar='FILE',

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            help="Read syslog messages from given file")

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    syslog.add_option('--syslog-tail',          metavar='FILE',

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            help="Continuously poll syslog messages given file")

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    syslog.add_option('--syslog-raw',           action='store_true',

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            help="Parse raw syslog lines without timestamp/etc")

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    syslog.add_option('--syslog-facility',      metavar='FACILITY',

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            help="Set/filter by given facility")

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    syslog.add_option('--syslog-prog',          metavar='PROG',     default=prog,

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            help="Filter by given prog: %default")

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    return syslog

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def apply (options, optional=False) :

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    """

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        Handle options, returning a SyslogSource, if any.

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        May log.error/sys.exit

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    """

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    if options.syslog_fifo :

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        # fifo pipe

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        source = fifo.Fifo(options.syslog_fifo)

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        poll = True # select(source)

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    elif options.syslog_tail :

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        # tail file

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        source = tail.TailFile(options.syslog_tail, skip=True)

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        poll = 2.0 # select(float)

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    elif options.syslog_file :

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        # read file

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        source = tail.Tail(open(options.syslog_file))

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        poll = False # do not loop, just read up to EOF

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    elif optional :

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        return None

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    else :

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        # from stdin

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        if sys.stdin.isatty() :

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            log.warning("Reading syslog messages from TTY?")

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        source = tail.Tail(sys.stdin)

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        poll = False # XXX: tty vs pipe vs file?

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    # options

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    parser = SyslogParser(

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        raw         = options.syslog_raw,

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        facility    = options.syslog_facility,

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    )

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    filter = SyslogFilter(

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        # glob pattern

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        prog        = options.syslog_prog,

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        facility    = options.syslog_facility,

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    )

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    # polling

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    return SyslogSource(source, parser, filter, poll)