# http://developer.intel.com/software/products/compilers/flin/
import re
import sys
import platform
from os import environ

from numpy.distutils.exec_command import exec_command
from numpy.distutils.ccompiler import simple_version_match
from numpy.distutils.fcompiler import FCompiler, dummy_fortran_file

compilers = ['IntelFCompiler', 'IntelVisualFCompiler',
             'IntelItaniumFCompiler', 'IntelItaniumVisualFCompiler',
             'IntelEM64VisualFCompiler', 'IntelEM64TFCompiler']


def intel_version_match(type):
    # Match against the important stuff in the version string
    return simple_version_match(start=r'Intel.*?Fortran.*?(?:%s).*?Version' % (type,))


class BaseIntelFCompiler(FCompiler):
    def update_executables(self):
        f = dummy_fortran_file()
        self.executables['version_cmd'] = ['<F77>', '-FI', '-V', '-c',
                                           f + '.f', '-o', f + '.o']

    def runtime_library_dir_option(self, dir):
        # TODO: could use -Xlinker here, if it's supported
        assert "," not in dir

        return '-Wl,-rpath=%s' % dir


    def get_version(self):
        if platform.system() == 'Windows':
            version_cmd = "icl -dummy"
            status, output = exec_command(version_cmd, use_tee=0)
            version = re.search(r'Version\s*([\d.]+)', output).group(1)
        else:
            version_cmd = "icc -dumpversion"
            status, version = exec_command(version_cmd, use_tee=0)
        return version


class IntelFCompiler(BaseIntelFCompiler):

    compiler_type = 'intel'
    compiler_aliases = ('ifort',)
    description = 'Intel Fortran Compiler for 32-bit apps'
    version_match = intel_version_match('32-bit|IA-32')

    possible_executables = ['ifort', 'ifc']

    executables = {
        'version_cmd'  : None,          # set by update_executables
        'compiler_f77' : [None, "-72", "-w90", "-w95"],
        'compiler_f90' : [None],
        'compiler_fix' : [None, "-FI"],
        'linker_so'    : ["<F90>", "-shared"],
        'archiver'     : ["ar", "-cr"],
        'ranlib'       : ["ranlib"]
        }

    pic_flags = ['-fPIC']
    module_dir_switch = '-module '  # Don't remove ending space!
    module_include_switch = '-I'

    def get_flags_free(self):
        return ['-FR']

    def get_flags(self):
        return ['-fPIC']

    def get_flags_opt(self):  # Scipy test failures with -O2
        v = self.get_version()
        return ['-fp-model', 'strict', '-O3']

    def get_flags_arch(self):
        return []

    def get_flags_linker_so(self):
        opt = FCompiler.get_flags_linker_so(self)
        v = self.get_version()
        if v and v >= '8.0':
            opt.append('-nofor_main')
        if sys.platform == 'darwin':
            # Here, it's -dynamiclib
            try:
                idx = opt.index('-shared')
                opt.remove('-shared')
            except ValueError:
                idx = 0
            opt[idx:idx] = ['-dynamiclib', '-Wl,-undefined,dynamic_lookup']
        return opt


class IntelItaniumFCompiler(IntelFCompiler):
    compiler_type = 'intele'
    compiler_aliases = ()
    description = 'Intel Fortran Compiler for Itanium apps'

    version_match = intel_version_match('Itanium|IA-64')

    possible_executables = ['ifort', 'efort', 'efc']

    executables = {
        'version_cmd'  : None,
        'compiler_f77' : [None, "-FI", "-w90", "-w95"],
        'compiler_fix' : [None, "-FI"],
        'compiler_f90' : [None],
        'linker_so'    : ['<F90>', "-shared"],
        'archiver'     : ["ar", "-cr"],
        'ranlib'       : ["ranlib"]
        }


class IntelEM64TFCompiler(IntelFCompiler):
    compiler_type = 'intelem'
    compiler_aliases = ()
    description = 'Intel Fortran Compiler for 64-bit apps'

    version_match = intel_version_match('EM64T-based|Intel\\(R\\) 64|64|IA-64|64-bit')

    possible_executables = ['ifort', 'efort', 'efc']

    executables = {
        'version_cmd'  : None,
        'compiler_f77' : [None, "-FI"],
        'compiler_fix' : [None, "-FI"],
        'compiler_f90' : [None],
        'linker_so'    : ['<F90>', "-shared"],
        'archiver'     : ["ar", "-cr"],
        'ranlib'       : ["ranlib"]
        }

# Is there no difference in the version string between the above compilers
# and the Visual compilers?


class IntelVisualFCompiler(BaseIntelFCompiler):
    compiler_type = 'intelv'
    description = 'Intel Visual Fortran Compiler for 32-bit apps'
    version_match = intel_version_match('32-bit|IA-32')

    def update_executables(self):
        f = dummy_fortran_file()
        self.executables['version_cmd'] = ['<F77>', '/FI', '/c',
                                           f + '.f', '/o', f + '.o']

    ar_exe = 'lib.exe'
    possible_executables = ['ifort', 'ifl']

    executables = {
        'version_cmd'  : None,
        'compiler_f77' : [None],
        'compiler_fix' : [None],
        'compiler_f90' : [None],
        'linker_so'    : [None],
        'archiver'     : [ar_exe, "/verbose", "/OUT:"],
        'ranlib'       : None
        }

    compile_switch = '/c '
    object_switch = '/Fo'     # No space after /Fo!
    library_switch = '/OUT:'  # No space after /OUT:!
    module_dir_switch = '/module:'  # No space after /module:
    module_include_switch = '/I'

    def get_flags(self):
        opt = ['/nologo', '/MD', '/nbs', '/names:lowercase', 
               '/assume:underscore', '/fpp']
        return opt

    def get_flags_free(self):
        return []

    def get_flags_debug(self):
        return ["/4Yb", "/d2"]

    def get_flags_opt(self):
        return ["/O3", "/fp:strict"]  # Scipy test failures with /O

    def get_flags_arch(self):
        return ["/arch:IA32", "/QaxSSE3"]

    def runtime_library_dir_option(self, dir):
        raise NotImplementedError


class IntelItaniumVisualFCompiler(IntelVisualFCompiler):
    compiler_type = 'intelev'
    description = 'Intel Visual Fortran Compiler for Itanium apps'

    version_match = intel_version_match('Itanium')

    possible_executables = ['efl']  # XXX this is a wild guess
    ar_exe = IntelVisualFCompiler.ar_exe

    executables = {
        'version_cmd'  : None,
        'compiler_f77' : [None, "-FI", "-w90", "-w95"],
        'compiler_fix' : [None, "-FI", "-4L72", "-w"],
        'compiler_f90' : [None],
        'linker_so'    : ['<F90>', "-shared"],
        'archiver'     : [ar_exe, "/verbose", "/OUT:"],
        'ranlib'       : None
        }


class IntelEM64VisualFCompiler(IntelVisualFCompiler):
    compiler_type = 'intelvem'
    description = 'Intel Visual Fortran Compiler for 64-bit apps'

    version_match = simple_version_match(start=r'Intel\(R\).*?64,')

    def get_flags_arch(self):
        return environ.get('ARCH_FLAGS', '/QxSSE4.2 /QaxCORE-AVX2,COMMON-AVX512').strip().split()


if __name__ == '__main__':
    from distutils import log
    log.set_verbosity(2)
    from numpy.distutils import customized_fcompiler
    print(customized_fcompiler(compiler='intel').get_version())
