<gh_stars>1000+
"""!

@brief CCORE Wrapper for K-Medians algorithm.

@authors <NAME> (<EMAIL>)
@date 2014-2020
@copyright BSD-3-Clause

"""


from ctypes import c_double, c_size_t, POINTER

from pyclustering.core.wrapper import ccore_library
from pyclustering.core.pyclustering_package import pyclustering_package, package_extractor, package_builder


def kmedians(sample, centers, tolerance, itermax, metric_pointer):
    pointer_data = package_builder(sample, c_double).create()
    pointer_centers = package_builder(centers, c_double).create()
    
    ccore = ccore_library.get()
    
    ccore.kmedians_algorithm.restype = POINTER(pyclustering_package)
    package = ccore.kmedians_algorithm(pointer_data, pointer_centers, c_double(tolerance), c_size_t(itermax), metric_pointer)
    
    result = package_extractor(package).extract()
    ccore.free_pyclustering_package(package)
    
    return result[0], result[1]