# -*- coding: utf-8 -*-
# vim:set expandtab tabstop=4 shiftwidth=4:
#
# The MIT License (MIT)
# LdapCherry
# Copyright (c) 2014 Carpentier Pierre-Francois

import os
import sys
import re

from ldapcherry.pyyamlwrapper import loadNoDump
from ldapcherry.pyyamlwrapper import DumplicatedKey
from ldapcherry.exceptions import *
import yaml

if sys.version < '3':
    from sets import Set as set

# List of available types for form
types = ['string', 'textfield', 'email', 'int', 'stringlist',
         'fix', 'password']


class Attributes:

    def __init__(self, attributes_file):
        self.attributes_file = attributes_file
        self.backends = set([])
        self.self_attributes = {}
        self.backend_attributes = {}
        self.displayed_attributes = {}
        self.key = None
        try:
            stream = open(attributes_file, 'r')
        except Exception as e:
            raise MissingAttributesFile(attributes_file)
        try:
            self.attributes = loadNoDump(stream)
        except DumplicatedKey as e:
            raise DumplicateAttributesKey(e.key)

        for attrid in self.attributes:
            self._mandatory_check(attrid)
            attr = self.attributes[attrid]
            if not attr['type'] in types:
                raise WrongAttributeType(
                    attr['type'],
                    attrid,
                    attributes_file
                    )
            if attr['type'] == 'password':
                if attrid + '1' in self.attributes or \
                        attrid + '2' in self.attributes:
                    raise PasswordAttributesCollision(attrid)
            if 'self' in attr and attr['self']:
                self.self_attributes[attrid] = attr
            if 'key' in attr and attr['key']:
                if self.key is not None:
                    raise DumplicateUserKey(attrid, self.key)
                self.key = attrid
            for b in attr['backends']:
                self.backends.add(b)
                if b not in self.backend_attributes:
                    self.backend_attributes[b] = {}
                self.backend_attributes[b][attr['backends'][b]] = attrid
            if 'search_displayed' in attr and attr['search_displayed']:
                self.displayed_attributes[attrid] = attr

        if self.key is None:
            raise MissingUserKey()

    def _is_email(self, email):
        pattern = r'[\.\w]{1,}[@]\w+[.]\w+'
        if re.match(pattern, email):
            return True
        else:
            return False

    def check_attr(self, attr, value):
        attrid = attr
        if attrid not in self.attributes:
            raise AttrNotDefined(attrid)
        attr_type = self.attributes[attrid]['type']
        if attr_type == 'string':
            return
        elif attr_type == 'textfield':
            return
        elif attr_type == 'email':
            if self._is_email(value):
                return
            else:
                raise WrongAttrValue(attrid, attr_type)
        elif attr_type == 'int':
            try:
                int(value)
                return
            except ValueError:
                raise WrongAttrValue(attrid, attr_type)
        elif attr_type == 'stringlist':
            if value in self.attributes[attrid]['values']:
                return
            else:
                raise WrongAttrValue(attrid, attr_type)
        elif attr_type == 'fix':
            if value != self.attributes[attrid]['value']:
                raise WrongAttrValue(attrid, attr_type)
        elif attr_type == 'password':
            return

    def get_search_attributes(self):
        return self.displayed_attributes

    def get_key(self):
        return self.key

    def _mandatory_check(self, attr):
        for m in ['description', 'display_name', 'type', 'backends', 'weight']:
            if m not in self.attributes[attr]:
                raise MissingKey(m, attr, self.attributes_file)

    def get_selfattributes(self):
        """get the list of groups from roles"""
        return self.self_attributes

    def get_backends(self):
        """return the list of backends in roles file"""
        return self.backends

    def get_backend_attributes(self, backend):
        if backend not in self.backends:
            raise WrongBackend(backend)
        ret = list(self.backend_attributes[backend].keys())
        ret.sort()
        return ret

    def get_backend_key(self, backend):
        if backend not in self.backends:
            raise WrongBackend(backend)
        return self.attributes[self.key]['backends'][backend]

    def get_attributes(self):
        """get the list of groups from roles"""
        return self.attributes.keys()

    def get_backends_attributes(self, attribute):
        return self.attributes[attribute]['backends']