"""
Copyright (c) 2019 Textkernel BV

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""

import functools
from collections import namedtuple
from timeit import default_timer as timer

import py2neo
from neo4j.v1 import GraphDatabase

Test = namedtuple('Test', ['name', 'kwargs'])


class TestRunner:
    def __init__(self):
        username = ''
        password = ''
        self.connectors = [
            py2neoConnector(username, password),
            py2neoConnector(username, password, scheme='http'),
            Neo4jDriverConnector(username, password)
        ]
        self.max_name_len = max(len(connector.name) for connector in self.connectors)

        self.lexical_term_names = [line.strip() for line in open('lexical_term_names.txt')]
        self.tests = [
            Test('count_all', {}),
            Test('retrieve_nodes_by_limit', {'limit': 10}),
            Test('retrieve_nodes_by_limit', {'limit': 100}),
            Test('retrieve_nodes_by_limit', {'limit': 1000}),
            # Test('retrieve_nodes_by_limit', {'limit': 10000}),
            # Test('retrieve_nodes_by_limit', {'limit': 100000}),
            # Test('retrieve_nodes_by_limit', {'limit': 1000000}),
            Test('retrieve_nodes_by_name', {'names': self.lexical_term_names[:10]}),
            Test('retrieve_nodes_by_name', {'names': self.lexical_term_names[:100]}),
            Test('retrieve_nodes_by_name', {'names': self.lexical_term_names[:1000]}),
            Test('retrieve_nodes_by_name', {'names': self.lexical_term_names[:10000]}),
            # Test('retrieve_nodes_by_name', {'names': self.lexical_term_names[:50000]}),
        ]

    def run_tests(self, repetitions=10):
        print(f"Testing with {repetitions} repetitions", end='\n\n')
        for test in self.tests:
            print(str(test)[:250])
            for connector in self.connectors:
                raw_method = getattr(connector, test.name)
                if self.is_method_of_super_class(raw_method, connector):
                    continue

                prepared_method = functools.partial(raw_method, **test.kwargs)
                times = [self.timeit_ms(prepared_method) for _ in range(repetitions)]
                display_times = ', '.join([f'{time:.2f}' for time in times])
                print(
                    f"\t{connector.name:<{self.max_name_len}} took {self.average(times):.1f}ms ({display_times})")

    @staticmethod
    def timeit_ms(method):
        start = timer()
        method()
        end = timer()
        return (end - start) * 1000

    @staticmethod
    def average(values):
        return sum(values) / len(values)

    @staticmethod
    def is_method_of_super_class(method, connector):
        # connector
        class_name_string = str(type(connector))
        cleaned_class_name_string = class_name_string[class_name_string.find('.') + 1:-2]

        # method
        method_string = str(method)
        method_parent_string = method_string[14:method_string.find('.')]

        return cleaned_class_name_string != method_parent_string


class AbstractConnector:
    def count_all(self):
        raise NotImplementedError()

    def retrieve_nodes_by_limit(self, limit):
        raise NotImplementedError

    def retrieve_nodes_by_name(self, names):
        raise NotImplementedError


class py2neoConnector(AbstractConnector):
    def __init__(self, username, password, scheme='bolt', **kwargs):
        self.name = f"py2neo-{scheme}"
        self.connection = py2neo.Graph(auth=(username, password), scheme=scheme, **kwargs)

    def count_all(self):
        return self.connection.run("MATCH (n) RETURN COUNT(*)").data()

    def retrieve_nodes_by_limit(self, limit):
        return self.connection.run("MATCH (n:lexical_term) RETURN n LIMIT {limit}", {'limit': limit}).data()

    def retrieve_nodes_by_name(self, names):
        transaction = self.connection.begin()
        cursors = [
            transaction.run("MATCH (n:lexical_term {name: {name}}) RETURN n", {'name': name})
            for name in names
        ]
        # transaction.process()
        transaction.commit()
        return [cursor.data() for cursor in cursors]


class Neo4jDriverConnector(AbstractConnector):
    def __init__(self, username, password, **kwargs):
        self.name = f"neo4j-driver"
        self.connection = GraphDatabase.driver("bolt://localhost:7687", auth=(username, password))

    def count_all(self):
        with self.connection.session() as session:
            return session.run("MATCH (n) RETURN COUNT(*)").data()

    def retrieve_nodes_by_limit(self, limit):
        with self.connection.session() as session:
            return session.run("MATCH (n:lexical_term) RETURN n LIMIT {limit}", {'limit': limit}).data()

    def retrieve_nodes_by_name(self, names):
        with self.connection.session() as session:
            transaction = session.begin_transaction()
            cursors = [
                transaction.run("MATCH (n:lexical_term {name: {name}}) RETURN n", {'name': name})
                for name in names
            ]
            transaction.sync()
            transaction.close()
            return [cursor.data() for cursor in cursors]


if __name__ == '__main__':
    TestRunner().run_tests()