#!/usr/bin/env python
"""
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you 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.

"""

import re
import socket
from resource_management import *

def escape_yaml_propetry(value):
  # pre-process value for any "_HOST" tokens
  value = value.replace('_HOST', socket.getfqdn())

  unquouted = False
  unquouted_values = ["null","Null","NULL","true","True","TRUE","false","False","FALSE","YES","Yes","yes","NO","No","no","ON","On","on","OFF","Off","off"]
  
  if value in unquouted_values:
    unquouted = True

  # if is list [a,b,c]
  if re.match('^\w*\[.+\]\w*$', value):
    unquouted = True

  # if is map {'a':'b'}
  if re.match('^\w*\{.+\}\w*$', value):
    unquouted = True

  try:
    int(value)
    unquouted = True
  except ValueError:
    pass
  
  try:
    float(value)
    unquouted = True
  except ValueError:
    pass
  
  if not unquouted:
    value = value.replace("'","''")
    value = "'"+value+"'"
    
  return value

def yaml_inline_template(configurations):
  return source.InlineTemplate('''{% for key, value in configurations_dict.items() %}{{ key }}: {{ escape_yaml_propetry(value) }}
{% endfor %}''', configurations_dict=configurations, extra_imports=[escape_yaml_propetry])

def yaml_config(
  filename,
  configurations = None,
  conf_dir = None,
  mode = None,
  owner = None,
  group = None
):
    config_content = yaml_inline_template(configurations)

    File (format("{conf_dir}/{filename}"),
      content = config_content,
      owner = owner,
      group = group,
      mode = mode
    )