# Copyright 2012-2017 The Meson development team

# 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.

from pathlib import Path
import typing as T
import subprocess, os

from .. import coredata
from .compilers import (
    clike_debug_args,
    Compiler,
)
from .mixins.clike import CLikeCompiler
from .mixins.gnu import (
    GnuCompiler, gnulike_buildtype_args, gnu_optimization_args,
)
from .mixins.intel import IntelGnuLikeCompiler, IntelVisualStudioLikeCompiler
from .mixins.clang import ClangCompiler
from .mixins.elbrus import ElbrusCompiler
from .mixins.pgi import PGICompiler

from mesonbuild.mesonlib import (
    version_compare, EnvironmentException, MesonException, MachineChoice,
    LibType, OptionKey,
)

if T.TYPE_CHECKING:
    from ..coredata import KeyedOptionDictType
    from ..dependencies import Dependency
    from ..envconfig import MachineInfo
    from ..environment import Environment
    from ..linkers import DynamicLinker
    from ..programs import ExternalProgram
    from .compilers import CompileCheckMode


class FortranCompiler(CLikeCompiler, Compiler):

    language = 'fortran'

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        Compiler.__init__(self, exelist, version, for_machine, info,
                          is_cross=is_cross, full_version=full_version, linker=linker)
        CLikeCompiler.__init__(self, exe_wrapper)

    def has_function(self, funcname: str, prefix: str, env: 'Environment', *,
                     extra_args: T.Optional[T.List[str]] = None,
                     dependencies: T.Optional[T.List['Dependency']] = None) -> T.Tuple[bool, bool]:
        raise MesonException('Fortran does not have "has_function" capability.\n'
                             'It is better to test if a Fortran capability is working like:\n\n'
                             "meson.get_compiler('fortran').links('block; end block; end program')\n\n"
                             'that example is to see if the compiler has Fortran 2008 Block element.')

    def sanity_check(self, work_dir_: str, environment: 'Environment') -> None:
        work_dir = Path(work_dir_)
        source_name = work_dir / 'sanitycheckf.f90'
        binary_name = work_dir / 'sanitycheckf'
        if binary_name.is_file():
            binary_name.unlink()

        source_name.write_text('print *, "Fortran compilation is working."; end', encoding='utf-8')

        extra_flags: T.List[str] = []
        extra_flags += environment.coredata.get_external_args(self.for_machine, self.language)
        extra_flags += environment.coredata.get_external_link_args(self.for_machine, self.language)
        extra_flags += self.get_always_args()
        # %% build the test executable "sanitycheckf"
        # cwd=work_dir is necessary on Windows especially for Intel compilers to avoid error: cannot write on sanitycheckf.obj
        # this is a defect with how Windows handles files and ifort's object file-writing behavior vis concurrent ProcessPoolExecutor.
        # This simple workaround solves the issue.
        # FIXME: cwd=str(work_dir) is for Python 3.5 on Windows, when 3.5 is deprcated, this can become cwd=work_dir
        returncode = subprocess.run(self.exelist + extra_flags + [str(source_name), '-o', str(binary_name)],
                                    cwd=str(work_dir)).returncode
        if returncode != 0:
            raise EnvironmentException('Compiler %s can not compile programs.' % self.name_string())
        if self.is_cross:
            if self.exe_wrapper is None:
                # Can't check if the binaries run so we have to assume they do
                return
            cmdlist = self.exe_wrapper.get_command() + [str(binary_name)]
        else:
            cmdlist = [str(binary_name)]
        # %% Run the test executable
        try:
            returncode = subprocess.run(cmdlist, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL).returncode
            if returncode != 0:
                raise EnvironmentException('Executables created by Fortran compiler %s are not runnable.' % self.name_string())
        except OSError:
            raise EnvironmentException('Executables created by Fortran compiler %s are not runnable.' % self.name_string())

    def get_buildtype_args(self, buildtype: str) -> T.List[str]:
        return gnulike_buildtype_args[buildtype]

    def get_optimization_args(self, optimization_level: str) -> T.List[str]:
        return gnu_optimization_args[optimization_level]

    def get_debug_args(self, is_debug: bool) -> T.List[str]:
        return clike_debug_args[is_debug]

    def get_preprocess_only_args(self) -> T.List[str]:
        return ['-cpp'] + super().get_preprocess_only_args()

    def get_module_incdir_args(self) -> T.Tuple[str, ...]:
        return ('-I', )

    def get_module_outdir_args(self, path: str) -> T.List[str]:
        return ['-module', path]

    def compute_parameters_with_absolute_paths(self, parameter_list: T.List[str],
                                               build_dir: str) -> T.List[str]:
        for idx, i in enumerate(parameter_list):
            if i[:2] == '-I' or i[:2] == '-L':
                parameter_list[idx] = i[:2] + os.path.normpath(os.path.join(build_dir, i[2:]))

        return parameter_list

    def module_name_to_filename(self, module_name: str) -> str:
        if '_' in module_name:  # submodule
            s = module_name.lower()
            if self.id in ('gcc', 'intel', 'intel-cl'):
                filename = s.replace('_', '@') + '.smod'
            elif self.id in ('pgi', 'flang'):
                filename = s.replace('_', '-') + '.mod'
            else:
                filename = s + '.mod'
        else:  # module
            filename = module_name.lower() + '.mod'

        return filename

    def find_library(self, libname: str, env: 'Environment', extra_dirs: T.List[str],
                     libtype: LibType = LibType.PREFER_SHARED) -> T.Optional[T.List[str]]:
        code = 'stop; end program'
        return self._find_library_impl(libname, env, extra_dirs, code, libtype)

    def has_multi_arguments(self, args: T.List[str], env: 'Environment') -> T.Tuple[bool, bool]:
        return self._has_multi_arguments(args, env, 'stop; end program')

    def has_multi_link_arguments(self, args: T.List[str], env: 'Environment') -> T.Tuple[bool, bool]:
        return self._has_multi_link_arguments(args, env, 'stop; end program')

    def get_options(self) -> 'KeyedOptionDictType':
        opts = super().get_options()
        key = OptionKey('std', machine=self.for_machine, lang=self.language)
        opts.update({
            key: coredata.UserComboOption(
                'Fortran language standard to use',
                ['none'],
                'none',
            ),
        })
        return opts


class GnuFortranCompiler(GnuCompiler, FortranCompiler):

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 defines: T.Optional[T.Dict[str, str]] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        GnuCompiler.__init__(self, defines)
        default_warn_args = ['-Wall']
        self.warn_args = {'0': [],
                          '1': default_warn_args,
                          '2': default_warn_args + ['-Wextra'],
                          '3': default_warn_args + ['-Wextra', '-Wpedantic', '-fimplicit-none']}

    def get_options(self) -> 'KeyedOptionDictType':
        opts = FortranCompiler.get_options(self)
        fortran_stds = ['legacy', 'f95', 'f2003']
        if version_compare(self.version, '>=4.4.0'):
            fortran_stds += ['f2008']
        if version_compare(self.version, '>=8.0.0'):
            fortran_stds += ['f2018']
        key = OptionKey('std', machine=self.for_machine, lang=self.language)
        opts[key].choices = ['none'] + fortran_stds
        return opts

    def get_option_compile_args(self, options: 'KeyedOptionDictType') -> T.List[str]:
        args = []
        key = OptionKey('std', machine=self.for_machine, lang=self.language)
        std = options[key]
        if std.value != 'none':
            args.append('-std=' + std.value)
        return args

    def get_dependency_gen_args(self, outtarget: str, outfile: str) -> T.List[str]:
        # Disabled until this is fixed:
        # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62162
        # return ['-cpp', '-MD', '-MQ', outtarget]
        return []

    def get_module_outdir_args(self, path: str) -> T.List[str]:
        return ['-J' + path]

    def language_stdlib_only_link_flags(self) -> T.List[str]:
        return ['-lgfortran', '-lm']

    def has_header(self, hname: str, prefix: str, env: 'Environment', *,
                   extra_args: T.Union[None, T.List[str], T.Callable[['CompileCheckMode'], T.List[str]]] = None,
                   dependencies: T.Optional[T.List['Dependency']] = None,
                   disable_cache: bool = False) -> T.Tuple[bool, bool]:
        '''
        Derived from mixins/clike.py:has_header, but without C-style usage of
        __has_include which breaks with GCC-Fortran 10:
        https://github.com/mesonbuild/meson/issues/7017
        '''
        code = f'{prefix}\n#include <{hname}>'
        return self.compiles(code, env, extra_args=extra_args,
                             dependencies=dependencies, mode='preprocess', disable_cache=disable_cache)


class ElbrusFortranCompiler(GnuFortranCompiler, ElbrusCompiler):
    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 defines: T.Optional[T.Dict[str, str]] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        GnuFortranCompiler.__init__(self, exelist, version, for_machine, is_cross,
                                    info, exe_wrapper, defines=defines,
                                    linker=linker, full_version=full_version)
        ElbrusCompiler.__init__(self)

class G95FortranCompiler(FortranCompiler):

    LINKER_PREFIX = '-Wl,'

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        self.id = 'g95'
        default_warn_args = ['-Wall']
        self.warn_args = {'0': [],
                          '1': default_warn_args,
                          '2': default_warn_args + ['-Wextra'],
                          '3': default_warn_args + ['-Wextra', '-pedantic']}

    def get_module_outdir_args(self, path: str) -> T.List[str]:
        return ['-fmod=' + path]

    def get_no_warn_args(self) -> T.List[str]:
        # FIXME: Confirm that there's no compiler option to disable all warnings
        return []


class SunFortranCompiler(FortranCompiler):

    LINKER_PREFIX = '-Wl,'

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        self.id = 'sun'

    def get_dependency_gen_args(self, outtarget: str, outfile: str) -> T.List[str]:
        return ['-fpp']

    def get_always_args(self) -> T.List[str]:
        return []

    def get_warn_args(self, level: str) -> T.List[str]:
        return []

    def get_module_incdir_args(self) -> T.Tuple[str, ...]:
        return ('-M', )

    def get_module_outdir_args(self, path: str) -> T.List[str]:
        return ['-moddir=' + path]

    def openmp_flags(self) -> T.List[str]:
        return ['-xopenmp']


class IntelFortranCompiler(IntelGnuLikeCompiler, FortranCompiler):

    file_suffixes = ('f90', 'f', 'for', 'ftn', 'fpp', )

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        # FIXME: Add support for OS X and Windows in detect_fortran_compiler so
        # we are sent the type of compiler
        IntelGnuLikeCompiler.__init__(self)
        self.id = 'intel'
        default_warn_args = ['-warn', 'general', '-warn', 'truncated_source']
        self.warn_args = {'0': [],
                          '1': default_warn_args,
                          '2': default_warn_args + ['-warn', 'unused'],
                          '3': ['-warn', 'all']}

    def get_options(self) -> 'KeyedOptionDictType':
        opts = FortranCompiler.get_options(self)
        key = OptionKey('std', machine=self.for_machine, lang=self.language)
        opts[key].choices = ['none', 'legacy', 'f95', 'f2003', 'f2008', 'f2018']
        return opts

    def get_option_compile_args(self, options: 'KeyedOptionDictType') -> T.List[str]:
        args = []
        key = OptionKey('std', machine=self.for_machine, lang=self.language)
        std = options[key]
        stds = {'legacy': 'none', 'f95': 'f95', 'f2003': 'f03', 'f2008': 'f08', 'f2018': 'f18'}
        if std.value != 'none':
            args.append('-stand=' + stds[std.value])
        return args

    def get_preprocess_only_args(self) -> T.List[str]:
        return ['-cpp', '-EP']

    def language_stdlib_only_link_flags(self) -> T.List[str]:
        return ['-lifcore', '-limf']

    def get_dependency_gen_args(self, outtarget: str, outfile: str) -> T.List[str]:
        return ['-gen-dep=' + outtarget, '-gen-depformat=make']


class IntelClFortranCompiler(IntelVisualStudioLikeCompiler, FortranCompiler):

    file_suffixes = ('f90', 'f', 'for', 'ftn', 'fpp', )
    always_args = ['/nologo']

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice,
                 is_cross: bool, info: 'MachineInfo', target: str,
                 exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        IntelVisualStudioLikeCompiler.__init__(self, target)

        default_warn_args = ['/warn:general', '/warn:truncated_source']
        self.warn_args = {'0': [],
                          '1': default_warn_args,
                          '2': default_warn_args + ['/warn:unused'],
                          '3': ['/warn:all']}

    def get_options(self) -> 'KeyedOptionDictType':
        opts = FortranCompiler.get_options(self)
        key = OptionKey('std', machine=self.for_machine, lang=self.language)
        opts[key].choices = ['none', 'legacy', 'f95', 'f2003', 'f2008', 'f2018']
        return opts

    def get_option_compile_args(self, options: 'KeyedOptionDictType') -> T.List[str]:
        args = []
        key = OptionKey('std', machine=self.for_machine, lang=self.language)
        std = options[key]
        stds = {'legacy': 'none', 'f95': 'f95', 'f2003': 'f03', 'f2008': 'f08', 'f2018': 'f18'}
        if std.value != 'none':
            args.append('/stand:' + stds[std.value])
        return args

    def get_module_outdir_args(self, path: str) -> T.List[str]:
        return ['/module:' + path]


class PathScaleFortranCompiler(FortranCompiler):

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        self.id = 'pathscale'
        default_warn_args = ['-fullwarn']
        self.warn_args = {'0': [],
                          '1': default_warn_args,
                          '2': default_warn_args,
                          '3': default_warn_args}

    def openmp_flags(self) -> T.List[str]:
        return ['-mp']


class PGIFortranCompiler(PGICompiler, FortranCompiler):

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        PGICompiler.__init__(self)

        default_warn_args = ['-Minform=inform']
        self.warn_args = {'0': [],
                          '1': default_warn_args,
                          '2': default_warn_args,
                          '3': default_warn_args + ['-Mdclchk']}

    def language_stdlib_only_link_flags(self) -> T.List[str]:
        return ['-lpgf90rtl', '-lpgf90', '-lpgf90_rpm1', '-lpgf902',
                '-lpgf90rtl', '-lpgftnrtl', '-lrt']


class NvidiaHPC_FortranCompiler(PGICompiler, FortranCompiler):

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        PGICompiler.__init__(self)

        self.id = 'nvidia_hpc'
        default_warn_args = ['-Minform=inform']
        self.warn_args = {'0': [],
                          '1': default_warn_args,
                          '2': default_warn_args,
                          '3': default_warn_args + ['-Mdclchk']}


class FlangFortranCompiler(ClangCompiler, FortranCompiler):

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        ClangCompiler.__init__(self, {})
        self.id = 'flang'
        default_warn_args = ['-Minform=inform']
        self.warn_args = {'0': [],
                          '1': default_warn_args,
                          '2': default_warn_args,
                          '3': default_warn_args}

    def language_stdlib_only_link_flags(self) -> T.List[str]:
        return ['-lflang', '-lpgmath']

class Open64FortranCompiler(FortranCompiler):

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        self.id = 'open64'
        default_warn_args = ['-fullwarn']
        self.warn_args = {'0': [],
                          '1': default_warn_args,
                          '2': default_warn_args,
                          '3': default_warn_args}

    def openmp_flags(self) -> T.List[str]:
        return ['-mp']


class NAGFortranCompiler(FortranCompiler):

    def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoice, is_cross: bool,
                 info: 'MachineInfo', exe_wrapper: T.Optional['ExternalProgram'] = None,
                 linker: T.Optional['DynamicLinker'] = None,
                 full_version: T.Optional[str] = None):
        FortranCompiler.__init__(self, exelist, version, for_machine,
                                 is_cross, info, exe_wrapper, linker=linker,
                                 full_version=full_version)
        self.id = 'nagfor'
        # Warnings are on by default; -w disables (by category):
        self.warn_args = {
            '0': ['-w=all'],
            '1': [],
            '2': [],
            '3': [],
        }

    def get_always_args(self) -> T.List[str]:
        return self.get_nagfor_quiet(self.version)

    def get_module_outdir_args(self, path: str) -> T.List[str]:
        return ['-mdir', path]

    @staticmethod
    def get_nagfor_quiet(version: str) -> T.List[str]:
        return ['-quiet'] if version_compare(version, '>=7100') else []

    def get_pic_args(self) -> T.List[str]:
        return ['-PIC']

    def get_preprocess_only_args(self) -> T.List[str]:
        return ['-fpp']

    def get_std_exe_link_args(self) -> T.List[str]:
        return self.get_always_args()

    def openmp_flags(self) -> T.List[str]:
        return ['-openmp']