#!/usr/bin/env python2
# vim: expandtab:tabstop=4:shiftwidth=4

import argparse
import traceback
import sys
import os
import re
import ConfigParser

from openshift_ansible import awsutil

CONFIG_MAIN_SECTION = 'main'

class Oscp(object):
    def __init__(self):
        self.host = None
        self.user = ''
        self.file_path = os.path.join(os.path.dirname(os.path.realpath(__file__)))

        # Default the config path to /etc
        self.config_path = os.path.join(os.path.sep, 'etc',  \
                                        'openshift_ansible', \
                                        'openshift_ansible.conf')

        self.parse_cli_args()
        self.parse_config_file()

        # parse host and user
        self.process_host()

        self.aws = awsutil.AwsUtil()

        # get a dict of host inventory
        if self.args.refresh_cache:
            self.get_hosts(True)
        else:
            self.get_hosts()

        if (self.args.src == '' or self.args.dest == '') and not self.args.list:
            self.parser.print_help()
            return

        if self.args.debug:
            print self.host
            print self.args

        # perform the scp
        if self.args.list:
            self.list_hosts()
        else:
            self.scp()

    def parse_config_file(self):
        if os.path.isfile(self.config_path):
            config = ConfigParser.ConfigParser()
            config.read(self.config_path)

    def parse_cli_args(self):
        parser = argparse.ArgumentParser(description='OpenShift Online SSH Tool.')
        parser.add_argument('-d', '--debug', default=False,
                          action="store_true", help="debug mode")
        parser.add_argument('-v', '--verbose', default=False,
                          action="store_true", help="Verbose?")
        parser.add_argument('--refresh-cache', default=False,
                          action="store_true", help="Force a refresh on the host cache.")
        parser.add_argument('--list', default=False,
                          action="store_true", help="list out hosts")
        parser.add_argument('-r', '--recurse', action='store_true', default=False,
                            help='Recursively copy files to or from destination.')
        parser.add_argument('-o', '--ssh_opts', action='store',
                            help='options to pass to SSH.\n \
                                  "-oPort=22,TCPKeepAlive=yes"')

        parser.add_argument('src', nargs='?', default='')
        parser.add_argument('dest',nargs='?', default='')

        self.args = parser.parse_args()
        self.parser = parser


    def process_host(self):
        '''Determine host name and user name for SSH.
        '''
        # is the first param passed a valid file?
        if os.path.isfile(self.args.src) or os.path.isdir(self.args.src):
            self.local_src = True
            self.host = self.args.dest
        else:
            self.local_src = False
            self.host = self.args.src

        if '@' in self.host:
            re_host = re.compile("(.*@)(.*)(:.*$)")
        else:
            re_host = re.compile("(.*)(:.*$)")

        search = re_host.search(self.host)

        if search:
            if len(search.groups()) > 2:
                self.user = search.groups()[0]
                self.host = search.groups()[1]
                self.path = search.groups()[2]
            else:
                self.host = search.groups()[0]
                self.path = search.groups()[1]

    def get_hosts(self, refresh_cache=False):
        '''Query our host inventory and return a dict where the format '''
        if refresh_cache:
            self.host_inventory = self.aws.get_inventory(['--refresh-cache'])['_meta']['hostvars']
        else:
            self.host_inventory = self.aws.get_inventory()['_meta']['hostvars']

    def select_host(self):
        '''select host attempts to match the host specified
           on the command line with a list of hosts.
        '''
        results = None
        if self.host_inventory.has_key(self.host):
           results = (self.host, self.host_inventory[self.host])
        else:
            print "Could not find specified host: %s." % self.host

        # default - no results found.
        return results

    def list_hosts(self, limit=None):
        '''Function to print out the host inventory.

           Takes a single parameter to limit the number of hosts printed.
        '''
        for host_id, server_info in self.host_inventory.items():
            print '{oo_name:<35} {oo_clusterid:<10} {oo_environment:<8} ' \
                '{oo_id:<15} {oo_public_ip:<18} {oo_private_ip:<18}'.format(**server_info)

    def scp(self):
        '''scp files to or from a specified host
        '''
        try:
            # shell args start with the program name in position 1
            scp_args = ['/usr/bin/scp']

            if self.args.verbose:
                scp_args.append('-v')

            if self.args.recurse:
                scp_args.append('-r')

            if self.args.ssh_opts:
                for arg in self.args.ssh_opts.split(","):
                    scp_args.append("-o%s" % arg)

            results = self.select_host()

            if self.args.debug: print results

            if not results:
                return # early exit, no results

            # Assume we have one and only one.
            server_info = results[1]

            host_str = "%s%s%s" % (self.user, server_info['oo_public_ip'], self.path)

            if self.local_src:
                scp_args.append(self.args.src)
                scp_args.append(host_str)
            else:
                scp_args.append(host_str)
                scp_args.append(self.args.dest)

            print "Running: %s\n" % ' '.join(scp_args)

            os.execve('/usr/bin/scp', scp_args, os.environ)
        except:
            print traceback.print_exc()
            print sys.exc_info()


if __name__ == '__main__':
    oscp = Oscp()