# -*- coding: utf-8 -*-
#
# Copyright © 2019 Stephan Seitz <stephan.seitz@fau.de>
#
# Distributed under terms of the GPLv3 license.

"""

"""
from subprocess import CalledProcessError

import pycuda.driver
import pytest
import sympy

import pystencils
import pystencils.cpu.cpujit
import pystencils.gpucuda.cudajit
from pystencils.backends.cbackend import CBackend
from pystencils.backends.cuda_backend import CudaBackend


class ScreamingBackend(CBackend):

    def _print(self, node):
        normal_code = super()._print(node)
        return normal_code.upper()


class ScreamingGpuBackend(CudaBackend):

    def _print(self, node):
        normal_code = super()._print(node)
        return normal_code.upper()


def test_custom_backends():
    z, x, y = pystencils.fields("z, y, x: [2d]")

    normal_assignments = pystencils.AssignmentCollection([pystencils.Assignment(
        z[0, 0], x[0, 0] * sympy.log(x[0, 0] * y[0, 0]))], [])

    ast = pystencils.create_kernel(normal_assignments, target='cpu')
    print(pystencils.show_code(ast, ScreamingBackend()))
    with pytest.raises(CalledProcessError):
        pystencils.cpu.cpujit.make_python_function(ast, custom_backend=ScreamingBackend())

    ast = pystencils.create_kernel(normal_assignments, target='gpu')
    print(pystencils.show_code(ast, ScreamingGpuBackend()))
    with pytest.raises(pycuda.driver.CompileError):
        pystencils.gpucuda.cudajit.make_python_function(ast, custom_backend=ScreamingGpuBackend())


def main():

    test_custom_backends()


if __name__ == "__main__":
    main()