#!/usr/bin/python3
import optparse
import signal
import sys
import os

try:
    signal.signal(signal.SIGPIPE, signal.SIG_DFL)
except AttributeError:
    pass

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.client as client
import confluent.sortutil as sortutil




def main():
    argparser = optparse.OptionParser(
        usage='''\n       %prog noderange -o ansible.hosts -a
        ''')
    argparser.add_option('-o', '--output',
                         help='Writes an Ansible hosts file')
    argparser.add_option('-a', '--append', action='store_true',
                         help='Appends to existing hosts file')
    (options, args) = argparser.parse_args()
    try:
        noderange = args[0]
    except IndexError:
        argparser.print_help()
        sys.exit(1)
    if not options.output:
        sys.stderr.write('Output file must be specified by -o\n')
        sys.exit(1)
    sess = client.Command()
    databynode = {}
    for res in sess.read('/noderange/{0}/attributes/all'.format(noderange)):
        for node in res.get('databynode', {}):
            if node not in databynode:
                databynode[node] = {}
            databynode[node].update(res['databynode'][node])

    nodesbygroup = {}
    for node in sortutil.natural_sort(databynode):
        data = databynode[node]
        groups = data.get('groups', [])
        if not groups:
            nodesbygroup.setdefault('', set()).add(node.strip().lower())
        else:
            for g in groups:
                nodesbygroup.setdefault(g, set()).add(node.strip().lower())
    existing_data = {}
    if options.append and os.path.exists(options.output):
        current_group = ''
        with open(options.output, 'r') as f:
            for line in f:
                line = line.strip().lower()
                if not line:
                    continue
                if line.startswith('[') and line.endswith(']'):
                    current_group = line[1:-1]
                    existing_data.setdefault(current_group, set())
                else:
                    existing_data.setdefault(current_group, set()).add(line)

    for group, nodes in nodesbygroup.items():
        nodes = {n.strip().lower() for n in nodes}
        current_nodes = existing_data.get(group, set())
        new_nodes = nodes - current_nodes
        if new_nodes:
            existing_data.setdefault(group, set()).update(nodes)

    with open(options.output, 'w') as importfile:
        for group in sortutil.natural_sort(existing_data.keys()):
            if group:
                importfile.write('[{0}]\n'.format(group))
            for node in sortutil.natural_sort(existing_data[group]):
                importfile.write('{0}\n'.format(node))
            importfile.write('\n')


if __name__ == '__main__':
    main()