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# Original Python Recipe for Proxy:
# http://code.activestate.com/recipes/496741-object-proxying/
# Author: Tomer Filiba

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import json

from ansible.module_utils.six import string_types, text_type
from ansible.module_utils._text import to_text


__all__ = ['UnsafeProxy', 'AnsibleUnsafe', 'AnsibleJSONUnsafeEncoder', 'AnsibleJSONUnsafeDecoder', 'wrap_var']


class AnsibleUnsafe(object):
    __UNSAFE__ = True


class AnsibleUnsafeText(text_type, AnsibleUnsafe):
    pass


class UnsafeProxy(object):
    def __new__(cls, obj, *args, **kwargs):
        # In our usage we should only receive unicode strings.
        # This conditional and conversion exists to sanity check the values
        # we're given but we may want to take it out for testing and sanitize
        # our input instead.
        if isinstance(obj, string_types):
            obj = to_text(obj, errors='surrogate_or_strict')
            return AnsibleUnsafeText(obj)
        return obj


class AnsibleJSONUnsafeEncoder(json.JSONEncoder):
    def encode(self, obj):
        if isinstance(obj, AnsibleUnsafe):
            return super(AnsibleJSONUnsafeEncoder, self).encode(dict(__ansible_unsafe=True,
                                                                     value=to_text(obj, errors='surrogate_or_strict', nonstring='strict')))
        else:
            return super(AnsibleJSONUnsafeEncoder, self).encode(obj)


class AnsibleJSONUnsafeDecoder(json.JSONDecoder):
    def decode(self, obj):
        value = super(AnsibleJSONUnsafeDecoder, self).decode(obj)
        if isinstance(value, dict) and '__ansible_unsafe' in value:
            return UnsafeProxy(value.get('value', ''))
        else:
            return value


def _wrap_dict(v):
    for k in v.keys():
        if v[k] is not None:
            v[wrap_var(k)] = wrap_var(v[k])
    return v


def _wrap_list(v):
    for idx, item in enumerate(v):
        if item is not None:
            v[idx] = wrap_var(item)
    return v


def wrap_var(v):
    if isinstance(v, dict):
        v = _wrap_dict(v)
    elif isinstance(v, list):
        v = _wrap_list(v)
    else:
        if v is not None and not isinstance(v, AnsibleUnsafe):
            v = UnsafeProxy(v)
    return v