from elasticsearch import *
from elasticsearch_dsl import *
from os import path
import os
from typing import List
from swagger_server.models import Scholix, ObjectType, DSType, IdentifierType, RelationshipType, ObjectType, \
    ObjectTypeObjectType, CreatorType


def get_property():
    f = open(path.join(os.path.dirname(os.path.realpath(__file__)), '../../../api.properties'))
    p = {}
    for line in f:
        if not line.startswith("#"):
            data = line.strip().split("=")
            p[data[0].strip()] = data[1].strip()
    return p


class DLIESConnector(object):
    def __init__(self, index_host):
        props = get_property()
        index_name = props['api.index']

        self.index_host = [x.strip() for x in props['es_index'].split(',')]
        print "start with index " + index_name
        print index_host
        self.client = Elasticsearch(hosts=self.index_host)
        self.index_name = index_name

    def create_pid_pidType_query(self, pidType, pid):
        args = {'source.identifier.schema': pidType}
        args2 = {'source.identifier.identifier': pid}
        return Q('nested', path='source.identifier', query=Q('bool', must=[Q('match', **args), Q('match', **args2)]))

    def create_source_pid_query(self, value):
        args = {'source.identifier.identifier': value}
        return Q('nested', path='source.identifier', query=Q('bool', must=[Q('match', **args)]))

    def create_typology_query(self, value):
        args = {'target.objectType': value}
        return Q('nested', path='target', query=Q('bool', must=[Q('match', **args)]))

    def create_dataSource_query(self, value):
        args = {'linkprovider.name': value}
        return Q('nested', path='linkprovider', query=Q('bool', must=[Q('match', **args)]))

    def create_publisher_query(self, value):
        args = {'target.publisher.name': value}
        q = Q('nested', path='target.publisher', query=Q('bool', must=[Q('match', **args)]))
        return Q('nested', path='target', query=q)

    def list_datasources(self):
        search_object = Search(using=self.client, index=self.index_name).doc_type('scholix').query()
        search_object.aggs.bucket('all_datasources', 'nested', path='linkprovider').bucket('all_names', 'terms',
                                                                                           field='linkprovider.name',
                                                                                           size=100)

        response = search_object.execute()
        return [item.key for item in response.aggs.all_datasources.all_names.buckets]

    def convertLinkProvider(self, lp):
        result = []
        for item in lp:
            current_identifiers = []
            for ids in item['identifiers']:
                current_identifiers.append(IdentifierType(identifier=ids['identifier'], schema=ids['schema']))
            tmp = DSType(name=item['name'],
                         identifiers=[IdentifierType(x['identifier'], x['schema']) for x in item['identifiers']])
            result.append(tmp)
        return result

    def convertObject(self, inputObj):
        result = ObjectType()
        result.identifiers = []
        for item in inputObj.identifier:
            result.identifiers.append(IdentifierType(item.identifier, item.schema))
        result.identifiers.append(IdentifierType(inputObj.dnetIdentifier, 'dnetIdentifier'))
        result.object_provider = self.convertLinkProvider([x.provider for x in inputObj.collectedFrom])
        result.object_type = ObjectTypeObjectType(inputObj.objectType, '')
        if 'title' in inputObj:
            result.title = inputObj.title.replace(""","")
        if 'creator' in inputObj:
            result.creators = [CreatorType(x.name) for x in inputObj.creator]
        if 'publisher' in inputObj:
            publishers = []
            for p in inputObj.publisher:
                publishers.append(dict(name=p.name))
            result.publisher = publishers
        return result

    def convertScholix(self, response):
        result = []
        for item in response.hits:
            s = Scholix()
            s.relationship = RelationshipType(item.relationship.name, item.relationship.schema, '')
            s.link_provider = self.convertLinkProvider(item['linkprovider'])
            s.source = self.convertObject(item.source)
            s.target = self.convertObject(item.target)
            result.append(s)
        return result

    def realtionToPid(self, pid, pidType=None, datasource=None, typology=None, page=0):
        if pidType:
            query = self.create_pid_pidType_query(pidType.lower(), pid.lower())
        else:
            query = self.create_source_pid_query(pid.lower())
        filters = []
        if datasource and len(datasource):
            filters.append(self.create_dataSource_query(datasource))
        if typology and len(typology):
            filters.append(self.create_typology_query(typology))
        search_object = Search(using=self.client, index=self.index_name).doc_type('scholix').query(query)

        if len(filters):
            search_object = search_object.filter(Q('bool', must=filters))
        return self.convertScholix(search_object[page:page + 100].execute())

    def realtionToTypology(self, typology, page=0):
        search_object = Search(using=self.client, index=self.index_name).doc_type('scholix').query(
            self.create_typology_query(typology))
        return self.convertScholix(search_object[page:page + 100].execute())

    def realtionFromDatasource(self, datasource, page=0):
        search_object = Search(using=self.client, index=self.index_name).doc_type('scholix').query(
            self.create_dataSource_query(datasource))
        return self.convertScholix(search_object[page:page + 100].execute())

    def realtionFromPublisher(self, publisher, page=0):
        search_object = Search(using=self.client, index=self.index_name).doc_type('scholix').query(
            self.create_publisher_query(publisher))
        return self.convertScholix(search_object[page:page + 100].execute())