#!/usr/bin/env python
import jinja2
import tempfile
import os
import json
import pdb
import string
import random
import re
import traceback
import subprocess
from xos.config import Config, XOS_DIR
from xos.logger import observer_logger as logger

step_dir = Config().observer_steps_dir
sys_dir = Config().observer_sys_dir

os_template_loader = jinja2.FileSystemLoader( searchpath=[step_dir, "/opt/xos/synchronizers/shared_templates"])
os_template_env = jinja2.Environment(loader=os_template_loader)

def id_generator(size=6, chars=string.ascii_uppercase + string.digits):
    return ''.join(random.choice(chars) for _ in range(size))

def shellquote(s):
    return "'" + s.replace("'", "'\\''") + "'"

def get_playbook_fn(opts, path):
    if not opts.get("ansible_tag", None):
        # if no ansible_tag is in the options, then generate a unique one
        objname= id_generator()
        opts = opts.copy()
        opts["ansible_tag"] = objname

    objname = opts["ansible_tag"]

    pathed_sys_dir = os.path.join(sys_dir, path)
    if not os.path.isdir(pathed_sys_dir):
        os.makedirs(pathed_sys_dir)

    # symlink steps/roles into sys/roles so that playbooks can access roles
    roledir = os.path.join(step_dir,"roles")
    rolelink = os.path.join(pathed_sys_dir, "roles")
    if os.path.isdir(roledir) and not os.path.islink(rolelink):
        os.symlink(roledir,rolelink)

    return (opts, os.path.join(pathed_sys_dir,objname))

def run_template(name, opts, path='', expected_num=None, ansible_config=None, ansible_hosts=None, run_ansible_script=None, object=None):
    template = os_template_env.get_template(name)
    buffer = template.render(opts)

    (opts, fqp) = get_playbook_fn(opts, path)

    f = open(fqp,'w')
    f.write(buffer)
    f.flush()

    if ansible_config:
       os.environ["ANSIBLE_CONFIG"] = ansible_config
    if ansible_hosts:
       os.environ["ANSIBLE_HOSTS"] = ansible_hosts

    # This import needs to be here, otherwise ANSIBLE_CONFIG does not take effect
    from ansible_runner import Runner


    # Dropped support for observer_pretend - to be redone
    runner = Runner(
        playbook=fqp,
        run_data=opts,
        host_file=ansible_hosts)

    stats,aresults = runner.run()

    try:
        ok_results = []
        total_unreachable = 0
        failed = 0

        error_msg = []
        for x in aresults:
            if not x.is_failed() and not x.is_unreachable() and not x.is_skipped():
                ok_results.append(x)
            elif x.is_unreachable():
                failed+=1
                total_unreachable+=1
                try:
                    error_msg.append(x._result['msg'])
                except:
                    pass
            elif x.is_failed():
                failed+=1
                try:
                    error_msg.append(x._result['msg'])
                except:
                    pass

	    if (object):
		oprops = object.tologdict()
		ansible = x._result
		oprops['ansible']=1
		oprops['failed']=failed
		oprops['ansible_results']=json.dumps(ansible)

		logger.info(x._task, extra=oprops)


        if (expected_num is not None) and (len(ok_results) != expected_num):
            raise ValueError('Unexpected num %s!=%d' % (str(expected_num), len(ok_results)) )

        #total_unreachable = stats.unreachable

	if (failed):
		raise ValueError('Ansible playbook failed.')

    except ValueError,e:
        try:
            error = ' // '.join(error_msg)
        except:
            pass
        raise Exception(error)

    
    processed_results = map(lambda x:x._result, ok_results)
    return processed_results[1:] # 0 is setup

def run_template_ssh(name, opts, path='', expected_num=None, object=None):
    instance_name = opts["instance_name"]
    hostname = opts["hostname"]
    private_key = opts["private_key"]
    baremetal_ssh = opts.get("baremetal_ssh",False)
    if baremetal_ssh:
        # no instance_id or ssh_ip for baremetal
        # we never proxy to baremetal
        proxy_ssh = False
    else:
        instance_id = opts["instance_id"]
        ssh_ip = opts["ssh_ip"]
        try:
            proxy_ssh = Config().observer_proxy_ssh
        except:
            proxy_ssh = True

    if (not ssh_ip):
        raise Exception('IP of ssh proxy not available. Synchronization deferred')

    (opts, fqp) = get_playbook_fn(opts, path)
    private_key_pathname = fqp + ".key"
    config_pathname = fqp + ".config"
    hosts_pathname = fqp + ".hosts"

    f = open(private_key_pathname, "w")
    f.write(private_key)
    f.close()

    f = open(config_pathname, "w")
    f.write("[ssh_connection]\n")
    if proxy_ssh:
        proxy_ssh_key = getattr(Config(), "observer_proxy_ssh_key", None)
        proxy_ssh_user = getattr(Config(), "observer_proxy_ssh_user", "root")
        if proxy_ssh_key:
            # If proxy_ssh_key is known, then we can proxy into the compute
            # node without needing to have the OpenCloud sshd machinery in
            # place.
            proxy_command = "ProxyCommand ssh -q -i %s -o StrictHostKeyChecking=no %s@%s nc %s 22" % (proxy_ssh_key, proxy_ssh_user, hostname, ssh_ip)
        else:
            proxy_command = "ProxyCommand ssh -q -i %s -o StrictHostKeyChecking=no %s@%s" % (private_key_pathname, instance_id, hostname)
        f.write('ssh_args = -o "%s"\n' % proxy_command)
    f.write('scp_if_ssh = True\n')
    f.write('pipelining = True\n')
    f.write('\n[defaults]\n')
    f.write('host_key_checking = False\n')
    f.write('timeout = 30\n')
    f.close()

    f = open(hosts_pathname, "w")
    f.write("[%s]\n" % instance_name)
    if proxy_ssh or baremetal_ssh:
        f.write("%s ansible_ssh_private_key_file=%s\n" % (hostname, private_key_pathname))
    else:
        # acb: Login user is hardcoded, this is not great
        f.write("%s ansible_ssh_private_key_file=%s ansible_ssh_user=ubuntu\n" % (ssh_ip, private_key_pathname))
    f.close()

    # SSH will complain if private key is world or group readable
    os.chmod(private_key_pathname, 0600)

    print "ANSIBLE_CONFIG=%s" % config_pathname
    print "ANSIBLE_HOSTS=%s" % hosts_pathname

    return run_template(name, opts, path, ansible_config = config_pathname, ansible_hosts = hosts_pathname, run_ansible_script="/opt/xos/synchronizers/base/run_ansible_verbose", object=object)


def main():
    run_template('ansible/sync_user_deployments.yaml',{ "endpoint" : "http://172.31.38.128:5000/v2.0/",
             "name" : "Sapan Bhatia",
             "email": "gwsapan@gmail.com",
             "password": "foobar",
             "admin_user":"admin",
             "admin_password":"6a789bf69dd647e2",
             "admin_tenant":"admin",
             "tenant":"demo",
             "roles":['user','admin'] })