#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2017 Lenovo
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# This is a utility to bring xcoll (plus enhancements) to confluent
# the core engine is textgroup.py, this simply provides a CLI to use
# generically

import optparse
import os
import select
import sys

path = os.path.dirname(os.path.realpath(__file__))
path = os.path.realpath(os.path.join(path, '..', 'lib', 'python'))
if path.startswith('/opt'):
    sys.path.append(path)

import confluent.textgroup as tg
import confluent.client

argparser = optparse.OptionParser(usage="Usage: <other command> | %prog [options]")
argparser.add_option('-a', '--abbreviate', action='store_true',
                     help='Attempt to use confluent server to shorten noderanges')
argparser.add_option('-d', '--diff', action='store_true',
                     help='Show what differs between most common '
                          'output group and others')
argparser.add_option('-w', '--watch', action='store_true',
                     help='Show intermediate results while running')
argparser.add_option('-s', '--skipcommon', action='store_true',
                     help='Do not print most common result, only non modal '
                          'groups, useful when combined with -d')
argparser.add_option('-c', '--count', action='store_true',
                     help='Also display count of nodes in a given group')
argparser.add_option('-r', '--reverse', action='store_true',
                     help='Reverse sort order to show biggest output group '
                          'last')
argparser.add_option('-l', '--log', action='store', type='string', dest='log',
                     help='Log each output to file, using {node} as a placeholder for node.')
(options, args) = argparser.parse_args()
if sys.stdin.isatty():
    argparser.print_help()
    sys.exit(1)

grouped = tg.GroupedData()

if options.abbreviate:
    grouped = tg.GroupedData(confluent.client.Command())
else:
    grouped = tg.GroupedData()

def print_current():
    if options.diff:
        grouped.print_deviants(skipmodal=options.skipcommon, count=options.count,
                          reverse=options.reverse)
    elif options.log:
        grouped.print_all(skipmodal=options.skipcommon,
                               count=options.count,
                               reverse=options.reverse)
    sys.stdout.flush()

fullline = sys.stdin.readline()
printpending = True
clearpending = False
holdoff = 0
while fullline:
    for line in fullline.split('\n'):
        if not line:
            continue
        if ': ' not in line:
            line = 'UNKNOWN: ' + line
        if options.log:
            node, output = line.split(': ', 1)
            currlog = options.log.format(node=node, nodename=node)
            with open(currlog, mode='a')  as log:
                log.write(output + '\n')
            continue
        grouped.add_line(*line.split(': ', 1))
        if options.watch:
            if not holdoff:
                holdoff = os.times()[4] + 0.250
            if (holdoff < os.times()[4] or
                    not select.select((sys.stdin,), (), (), 0.250)[0]):
                # print now, nothing pending
                holdoff = 0
                sys.stdout.write('\x1b[2J\x1b[;H')  # clear screen
                print_current()
                printpending = False
                clearpending = True
            else:
                printpending = True
    fullline = sys.stdin.readline()

if printpending:
    if clearpending:
        sys.stdout.write('\x1b[2J\x1b[;H')  # clear screen
    print_current()