import pdb
import copy
import logging
import itertools
from time import sleep
import threading
from multiprocessing import Process
import sklearn.preprocessing

import pytest
from milvus import IndexType, MetricType
from utils import *

nb = 1
dim = 128
collection_id = "create_collection"
default_segment_size = 1024
drop_collection_interval_time = 3
segment_size = 10
default_fields = gen_default_fields() 
entities = gen_entities(nb)

class TestCreateCollection:

    """
    ******************************************************************
      The following cases are used to test `create_collection` function
    ******************************************************************
    """
    @pytest.fixture(
        scope="function",
        params=gen_single_filter_fields()
    )
    def get_filter_field(self, request):
        yield request.param

    @pytest.fixture(
        scope="function",
        params=gen_single_vector_fields()
    )
    def get_vector_field(self, request):
        yield request.param

    @pytest.fixture(
        scope="function",
        params=gen_segment_sizes()
    )
    def get_segment_size(self, request):
        yield request.param

    def test_create_collection_fields(self, connect, get_filter_field, get_vector_field):
        '''
        target: test create normal collection with different fields
        method: create collection with diff fields: metric/field_type/...
        expected: no exception raised
        '''
        filter_field = get_filter_field
        logging.getLogger().info(filter_field)
        vector_field = get_vector_field
        collection_name = gen_unique_str(collection_id)
        fields = {
                "fields": [filter_field, vector_field],
                "segment_size": segment_size
        }
        logging.getLogger().info(fields)
        connect.create_collection(collection_name, fields)
        assert connect.has_collection(collection_name)

    # TODO
    def test_create_collection_fields_create_index(self, connect, get_filter_field, get_vector_field):
        '''
        target: test create normal collection with different fields
        method: create collection with diff fields: metric/field_type/...
        expected: no exception raised
        '''
        filter_field = get_filter_field
        vector_field = get_vector_field
        collection_name = gen_unique_str(collection_id)
        fields = {
                "fields": [filter_field, vector_field],
                "segment_size": segment_size
        }
        connect.create_collection(collection_name, fields)
        assert connect.has_collection(collection_name)
        
    def test_create_collection_segment_size(self, connect, get_segment_size):
        '''
        target: test create normal collection with different fields
        method: create collection with diff segment_size
        expected: no exception raised
        '''
        collection_name = gen_unique_str(collection_id)
        fields = copy.deepcopy(default_fields)
        fields["segment_size"] = get_segment_size
        connect.create_collection(collection_name, fields)
        assert connect.has_collection(collection_name)

    def test_create_collection_auto_flush_disabled(self, connect):
        '''
        target: test create normal collection, with large auto_flush_interval
        method: create collection with corrent params
        expected: create status return ok
        '''
        disable_flush(connect)
        collection_name = gen_unique_str(collection_id)
        try:
            connect.create_collection(collection_name, default_fields)
        finally:
            enable_flush(connect)
        # pdb.set_trace()

    def test_create_collection_after_insert(self, connect, collection):
        '''
        target: test insert vector, then create collection again
        method: insert vector and create collection
        expected: error raised
        '''
        # pdb.set_trace()
        connect.insert(collection, entities)

        with pytest.raises(Exception) as e:
            connect.create_collection(collection, default_fields)

    def test_create_collection_after_insert_flush(self, connect, collection):
        '''
        target: test insert vector, then create collection again
        method: insert vector and create collection
        expected: error raised
        '''
        connect.insert(collection, entities)
        connect.flush([collection])
        with pytest.raises(Exception) as e:
            connect.create_collection(collection, default_fields)

    # TODO: assert exception
    @pytest.mark.level(2)
    def test_create_collection_without_connection(self, dis_connect):
        '''
        target: test create collection, without connection
        method: create collection with correct params, with a disconnected instance
        expected: create raise exception
        '''
        collection_name = gen_unique_str(collection_id)
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, default_fields)

    def test_create_collection_existed(self, connect):
        '''
        target: test create collection but the collection name have already existed
        method: create collection with the same collection_name
        expected: create status return not ok
        '''
        collection_name = gen_unique_str(collection_id)
        connect.create_collection(collection_name, default_fields)
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, default_fields)

    @pytest.mark.level(2)
    def test_create_collection_multithread(self, connect):
        '''
        target: test create collection with multithread
        method: create collection using multithread, 
        expected: collections are created
        '''
        threads_num = 8 
        threads = []
        collection_names = []

        def create():
            collection_name = gen_unique_str(collection_id)
            collection_names.append(collection_name)
            connect.create_collection(collection_name, default_fields)
        for i in range(threads_num):
            t = threading.Thread(target=create, args=())
            threads.append(t)
            t.start()
            time.sleep(0.2)
        for t in threads:
            t.join()
        
        res = connect.list_collections()
        for item in collection_names:
            assert item in res


class TestCreateCollectionInvalid(object):
    """
    Test creating collections with invalid params
    """
    @pytest.fixture(
        scope="function",
        params=gen_invalid_metric_types()
    )
    def get_metric_type(self, request):
        yield request.param

    @pytest.fixture(
        scope="function",
        params=gen_invalid_ints()
    )
    def get_segment_size(self, request):
        yield request.param

    @pytest.fixture(
        scope="function",
        params=gen_invalid_ints()
    )
    def get_dim(self, request):
        yield request.param

    @pytest.fixture(
        scope="function",
        params=gen_invalid_strs()
    )
    def get_invalid_string(self, request):
        yield request.param

    @pytest.fixture(
        scope="function",
        params=gen_invalid_field_types()
    )
    def get_field_type(self, request):
        yield request.param

    @pytest.mark.level(2)
    def test_create_collection_with_invalid_segment_size(self, connect, get_segment_size):
        collection_name = gen_unique_str()
        fields = copy.deepcopy(default_fields)
        fields["segment_size"] = get_segment_size
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, fields)

    @pytest.mark.level(2)
    def test_create_collection_with_invalid_metric_type(self, connect, get_metric_type):
        collection_name = gen_unique_str()
        fields = copy.deepcopy(default_fields)
        fields["fields"][-1]["params"]["metric_type"] = get_metric_type
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, fields)

    @pytest.mark.level(2)
    def test_create_collection_with_invalid_dimension(self, connect, get_dim):
        dimension = get_dim
        collection_name = gen_unique_str()
        fields = copy.deepcopy(default_fields)
        fields["fields"][-1]["params"]["dimension"] = dimension
        with pytest.raises(Exception) as e:
             connect.create_collection(collection_name, fields)

    @pytest.mark.level(2)
    def test_create_collection_with_invalid_collectionname(self, connect, get_invalid_string):
        collection_name = get_invalid_string
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, default_fields)

    @pytest.mark.level(2)
    def test_create_collection_with_empty_collectionname(self, connect):
        collection_name = ''
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, default_fields)

    @pytest.mark.level(2)
    def test_create_collection_with_none_collectionname(self, connect):
        collection_name = None
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, default_fields)

    def test_create_collection_None(self, connect):
        '''
        target: test create collection but the collection name is None
        method: create collection, param collection_name is None
        expected: create raise error
        '''
        with pytest.raises(Exception) as e:
            connect.create_collection(None, default_fields)

    def test_create_collection_no_dimension(self, connect):
        '''
        target: test create collection with no dimension params
        method: create collection with corrent params
        expected: create status return ok
        '''
        collection_name = gen_unique_str(collection_id)
        fields = copy.deepcopy(default_fields)
        fields["fields"][-1]["params"].pop("dimension")
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, fields)

    def test_create_collection_no_segment_size(self, connect):
        '''
        target: test create collection with no segment_size params
        method: create collection with corrent params
        expected: use default default_segment_size
        '''
        collection_name = gen_unique_str(collection_id)
        fields = copy.deepcopy(default_fields)
        fields.pop("segment_size")
        connect.create_collection(collection_name, fields)
        res = connect.get_collection_info(collection_name)
        logging.getLogger().info(res)
        assert res["segment_size"] == default_segment_size

    # TODO:
    def _test_create_collection_no_metric_type(self, connect):
        '''
        target: test create collection with no metric_type params
        method: create collection with corrent params
        expected: use default L2
        '''
        collection_name = gen_unique_str(collection_id)
        fields = copy.deepcopy(default_fields)
        fields["fields"][-1]["params"].pop("metric_type")
        connect.create_collection(collection_name, fields)
        res = connect.get_collection_info(collection_name)
        logging.getLogger().info(res)
        assert res["metric_type"] == "L2"

    # TODO: assert exception
    def test_create_collection_limit_fields(self, connect):
        collection_name = gen_unique_str(collection_id)
        limit_num = 64
        fields = copy.deepcopy(default_fields)
        for i in range(limit_num):
            field_name = gen_unique_str("field_name")
            field = {"field": field_name, "type": DataType.INT8}
            fields["fields"].append(field)
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, fields)

    # TODO: assert exception
    def test_create_collection_invalid_field_name(self, connect, get_invalid_string):
        collection_name = gen_unique_str(collection_id)
        fields = copy.deepcopy(default_fields)
        field_name = get_invalid_string
        field = {"field": field_name, "type": DataType.INT8}
        fields["fields"].append(field)
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, fields)

    # TODO: assert exception
    def test_create_collection_invalid_field_type(self, connect, get_field_type):
        collection_name = gen_unique_str(collection_id)
        fields = copy.deepcopy(default_fields)
        field_type = get_field_type
        field = {"field": "test_field", "type": field_type}
        fields["fields"].append(field)
        with pytest.raises(Exception) as e:
            connect.create_collection(collection_name, fields)