import numpy as np
import pystencils as ps
import pystencils.config


def test_create_kernel_config():
    c = pystencils.config.CreateKernelConfig()
    assert c.backend == ps.Backend.C
    assert c.target == ps.Target.CPU

    c = pystencils.config.CreateKernelConfig(target=ps.Target.GPU)
    assert c.backend == ps.Backend.CUDA

    c = pystencils.config.CreateKernelConfig(backend=ps.Backend.CUDA)
    assert c.target == ps.Target.CPU
    assert c.backend == ps.Backend.CUDA


def test_kernel_decorator_config():
    config = pystencils.config.CreateKernelConfig()
    a, b, c = ps.fields(a=np.ones(100), b=np.ones(100), c=np.ones(100))

    @ps.kernel_config(config)
    def test():
        a[0] @= b[0] + c[0]

    ps.create_kernel(**test)