# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

import socket

from spack import *


class Raja(CachedCMakePackage, CudaPackage, ROCmPackage):
    """RAJA Parallel Framework."""

    homepage = "https://software.llnl.gov/RAJA/"
    git      = "https://github.com/LLNL/RAJA.git"
    tags     = ['radiuss']

    maintainers = ['davidbeckingsale']

    version('develop', branch='develop', submodules='True')
    version('main',  branch='main',  submodules='True')
    version('0.14.0', tag='v0.14.0', submodules='True')
    version('0.13.0', tag='v0.13.0', submodules='True')
    version('0.12.1', tag='v0.12.1', submodules="True")
    version('0.12.0', tag='v0.12.0', submodules="True")
    version('0.11.0', tag='v0.11.0', submodules="True")
    version('0.10.1', tag='v0.10.1', submodules="True")
    version('0.10.0', tag='v0.10.0', submodules="True")
    version('0.9.0', tag='v0.9.0', submodules="True")
    version('0.8.0', tag='v0.8.0', submodules="True")
    version('0.7.0', tag='v0.7.0', submodules="True")
    version('0.6.0', tag='v0.6.0', submodules="True")
    version('0.5.3', tag='v0.5.3', submodules="True")
    version('0.5.2', tag='v0.5.2', submodules="True")
    version('0.5.1', tag='v0.5.1', submodules="True")
    version('0.5.0', tag='v0.5.0', submodules="True")
    version('0.4.1', tag='v0.4.1', submodules="True")
    version('0.4.0', tag='v0.4.0', submodules="True")

    # export targets when building pre-2.4.0 release with BLT 0.4.0+
    patch('https://github.com/LLNL/RAJA/commit/eca1124ee4af380d6613adc6012c307d1fd4176b.patch',
          sha256='57dd531a50ac791b4bb214d34a4bf3fca1349354927c72915b7ccd20524701a9',
          when='@:0.13.0 ^blt@0.4:')

    variant('openmp', default=True, description='Build OpenMP backend')
    variant('shared', default=True, description='Build Shared Libs')
    variant('examples', default=True, description='Build examples.')
    variant('exercises', default=True, description='Build exercises.')
    # TODO: figure out gtest dependency and then set this default True
    # and remove the +tests conflict below.
    variant('tests', default=False, description='Build tests')

    depends_on('blt')
    depends_on('blt@0.4.1:', type='build', when='@0.14.0:')
    depends_on('blt@0.4.0:', type='build', when='@0.13.0')
    depends_on('blt@0.3.6:', type='build', when='@:0.12.0')

    depends_on('camp@0.2.2', when='@0.14.0:')
    depends_on('camp@0.1.0', when='@0.12.0:0.13.0')

    with when('+rocm @0.12.0:'):
        depends_on('camp+rocm')
        for arch in ROCmPackage.amdgpu_targets:
            depends_on('camp+rocm amdgpu_target={0}'.format(arch),
                       when='amdgpu_target={0}'.format(arch))
        conflicts('+openmp')

    with when('+cuda @0.12.0:'):
        depends_on('camp+cuda')
        for sm_ in CudaPackage.cuda_arch_values:
            depends_on('camp +cuda cuda_arch={0}'.format(sm_),
                       when='cuda_arch={0}'.format(sm_))

    def _get_sys_type(self, spec):
        sys_type = spec.architecture
        if "SYS_TYPE" in env:
            sys_type = env["SYS_TYPE"]
        return sys_type

    @property
    def cache_name(self):
        hostname = socket.gethostname()
        if "SYS_TYPE" in env:
            hostname = hostname.rstrip('1234567890')
        return "{0}-{1}-{2}@{3}.cmake".format(
            hostname,
            self._get_sys_type(self.spec),
            self.spec.compiler.name,
            self.spec.compiler.version
        )

    def initconfig_hardware_entries(self):
        spec = self.spec
        entries = super(Raja, self).initconfig_hardware_entries()

        entries.append(cmake_cache_option("ENABLE_OPENMP", '+openmp' in spec))

        if '+cuda' in spec:
            entries.append(cmake_cache_option("ENABLE_CUDA", True))

            if not spec.satisfies('cuda_arch=none'):
                cuda_arch = spec.variants['cuda_arch'].value
                entries.append(cmake_cache_string(
                    "CUDA_ARCH", 'sm_{0}'.format(cuda_arch[0])))
                entries.append(cmake_cache_string(
                    "CMAKE_CUDA_ARCHITECTURES", '{0}'.format(cuda_arch[0])))
        else:
            entries.append(cmake_cache_option("ENABLE_CUDA", False))

        if '+rocm' in spec:
            entries.append(cmake_cache_option("ENABLE_HIP", True))
            entries.append(cmake_cache_path(
                "HIP_ROOT_DIR", '{0}'.format(spec['hip'].prefix)))
            archs = self.spec.variants['amdgpu_target'].value
            if archs != 'none':
                arch_str = ",".join(archs)
                entries.append(cmake_cache_string(
                    "HIP_HIPCC_FLAGS", '--amdgpu-target={0}'.format(arch_str)))
        else:
            entries.append(cmake_cache_option("ENABLE_HIP", False))

        return entries

    def initconfig_package_entries(self):
        spec = self.spec
        entries = []

        entries.append(cmake_cache_path("BLT_SOURCE_DIR", spec['blt'].prefix))
        entries.append(cmake_cache_path("camp_DIR", spec['camp'].prefix))
        entries.append(cmake_cache_option("BUILD_SHARED_LIBS", '+shared' in spec))
        entries.append(cmake_cache_option("ENABLE_EXAMPLES", '+examples' in spec))
        entries.append(cmake_cache_option("ENABLE_EXERCISES", '+exercises' in spec))

        # Work around spack adding -march=ppc64le to SPACK_TARGET_ARGS which
        # is used by the spack compiler wrapper.  This can go away when BLT
        # removes -Werror from GTest flags
        if self.spec.satisfies('%clang target=ppc64le:') or not self.run_tests:
            entries.append(cmake_cache_option("ENABLE_TESTS", False))
        else:
            entries.append(cmake_cache_option("ENABLE_TESTS", True))

        return entries

    def cmake_args(self):
        options = []
        return options

    @property
    def build_relpath(self):
        """Relative path to the cmake build subdirectory."""
        return join_path('..', self.build_dirname)

    @run_after('install')
    def setup_build_tests(self):
        """Copy the build test files after the package is installed to a
        relative install test subdirectory for use during `spack test run`."""
        # Now copy the relative files
        self.cache_extra_test_sources(self.build_relpath)

        # Ensure the path exists since relying on a relative path at the
        # same level as the normal stage source path.
        mkdirp(self.install_test_root)

    @property
    def _extra_tests_path(self):
        # TODO: The tests should be converted to re-build and run examples
        # TODO: using the installed libraries.
        return join_path(self.install_test_root, self.build_relpath, 'bin')

    def _test_examples(self):
        """Perform very basic checks on a subset of copied examples."""
        checks = [
            ('ex5_line-of-sight_solution',
             [r'RAJA sequential', r'RAJA OpenMP', r'result -- PASS']),
            ('ex6_stencil-offset-layout_solution',
             [r'RAJA Views \(permuted\)', r'result -- PASS']),
            ('ex8_tiled-matrix-transpose_solution',
             [r'parallel top inner loop',
              r'collapsed inner loops', r'result -- PASS']),
            ('kernel-dynamic-tile', [r'Running index', r'(24,24)']),
            ('plugin-example',
             [r'Launching host kernel for the 10 time']),
            ('tut_batched-matrix-multiply', [r'result -- PASS']),
            ('wave-eqn', [r'Max Error = 2', r'Evolved solution to time'])
        ]
        for exe, expected in checks:
            reason = 'test: checking output of {0} for {1}' \
                .format(exe, expected)
            self.run_test(exe, [], expected, installed=False,
                          purpose=reason, skip_missing=True,
                          work_dir=self._extra_tests_path)

    def test(self):
        """Perform smoke tests."""
        self._test_examples()
