# vim: set encoding=utf-8

#  Copyright (c) 2016 Intel Corporation 
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#


def triangle_count(self):
    """
    Counts the number of triangles each vertex is a part of

    Parameters
    ----------

    :return: (Frame) Frame containing the vertex id's and the count of the number of triangle they are in

    Examples
    --------

        >>> vertex_schema = [('id', int)]
        >>> edge_schema = [('src', int), ('dst', int)]

        >>> vertex_rows = [ [1], [2], [3], [4], [5] ]
        >>> edge_rows = [ [1, 2], [1, 3], [2, 3], [1, 4], [4, 5] ]
        >>> vertex_frame = tc.frame.create(vertex_rows, vertex_schema)
        >>> edge_frame = tc.frame.create(edge_rows, edge_schema)

        >>> graph = tc.graph.create(vertex_frame, edge_frame)

        >>> result = graph.triangle_count()
        >>> result.inspect()
        [#]  count  id 
        ==============
        [0]      1   1
        [1]      1   2
        [2]      1   3
        [3]      0   4
        [4]      0   5


    """
    from sparktk.frame.frame import Frame
    return Frame(self._tc, self._scala.triangleCount())