##############################################################################
# Copyright (c) 2017 Mark Olesen, OpenCFD Ltd.
#
# This file was authored by Mark Olesen <mark.olesen@esi-group.com>
# and is released as part of spack under the LGPL license.
# LLNL-CODE-647188
#
# For details, see https://github.com/spack/spack
# Please also see the NOTICE and LICENSE files for the LLNL notice and LGPL.
#
# License
# -------
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License (as
# published by the Free Software Foundation) version 2.1, February 1999.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
# conditions of the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Legal Notice
# ------------
# OPENFOAM is a trademark owned by OpenCFD Ltd
# (producer and distributor of the OpenFOAM software via www.openfoam.com).
# The trademark information must remain visible and unadulterated in this
# file and via the "spack info" and comply with the term set by
# http://openfoam.com/legal/trademark-policy.php
#
# This file is not part of OpenFOAM, nor does it constitute a component of an
# OpenFOAM distribution.
#
##############################################################################
#
# Notes
# - The openfoam-org package is a modified version of the openfoam-com package.
#   If changes are needed here, consider if they should also be applied there.
#
# - Building with boost/cgal is not included, since some of the logic is not
#   entirely clear and thus untested.
# - Resolution of flex, zlib needs more attention (within OpenFOAM)
#
# - mpi handling: WM_MPLIB=SYSTEMMPI and use spack to populate prefs.sh for it.
#   Provide wmake rules for special purpose 'USER' and 'USERMPI'
#   mpi implementations, in case these are required.
#
# Known issues
# - Combining +zoltan with +int64 has not been tested, but probably won't work.
# - Combining +mgridgen with +int64 or +float32 probably won't work.
#
##############################################################################
import glob
import re
import shutil
import os

import llnl.util.tty as tty

from spack import *
from spack.pkg.builtin.openfoam_com import add_extra_files
from spack.pkg.builtin.openfoam_com import write_environ
from spack.pkg.builtin.openfoam_com import rewrite_environ_files
from spack.pkg.builtin.openfoam_com import mplib_content
from spack.pkg.builtin.openfoam_com import OpenfoamArch


class OpenfoamOrg(Package):
    """OpenFOAM is a GPL-opensource C++ CFD-toolbox.
    The openfoam.org release is managed by the OpenFOAM Foundation Ltd as
    a licensee of the OPENFOAM trademark.
    This offering is not approved or endorsed by OpenCFD Ltd,
    producer and distributor of the OpenFOAM software via www.openfoam.com,
    and owner of the OPENFOAM trademark.
    """

    homepage = "http://www.openfoam.org/"
    baseurl  = "https://github.com/OpenFOAM"
    url      = "https://github.com/OpenFOAM/OpenFOAM-4.x/archive/version-4.1.tar.gz"

    version('4.1', '318a446c4ae6366c7296b61184acd37c',
            url=baseurl + '/OpenFOAM-4.x/archive/version-4.1.tar.gz')
    version('develop', git='https://github.com/OpenFOAM/OpenFOAM-dev.git')

    variant('int64', default=False,
            description='Compile with 64-bit label')
    variant('float32', default=False,
            description='Compile with 32-bit scalar (single-precision)')
    variant('source', default=True,
            description='Install library/application sources and tutorials')

    provides('openfoam')
    depends_on('mpi')
    depends_on('zlib')
    depends_on('flex',  type='build')
    depends_on('cmake', type='build')

    # Require scotch with ptscotch - corresponds to standard OpenFOAM setup
    depends_on('scotch~metis+mpi~int64', when='~int64')
    depends_on('scotch~metis+mpi+int64', when='+int64')

    # General patches - foamEtcFile as per openfoam.com (robuster)
    common = ['spack-Allwmake', 'README-spack']
    assets = ['bin/foamEtcFile']

    # Version-specific patches
    patch('41-etc.patch', when='@4.1')
    patch('41-site.patch', when='@4.1')

    # Some user config settings
    config = {
        'mplib': 'SYSTEMMPI',   # Use system mpi for spack
        # Add links into bin/, lib/ (eg, for other applications)
        'link': False
    }

    # The openfoam architecture, compiler information etc
    _foam_arch = None

    # Content for etc/prefs.{csh,sh}
    etc_prefs = {}

    # Content for etc/config.{csh,sh}/ files
    etc_config = {}

    phases = ['configure', 'build', 'install']
    build_script = './spack-Allwmake'  # <- Added by patch() method.

    #
    # - End of definitions / setup -
    #

    def setup_environment(self, spack_env, run_env):
        run_env.set('FOAM_PROJECT_DIR', self.projectdir)
        run_env.set('WM_PROJECT_DIR', self.projectdir)
        for d in ['wmake', self.archbin]:  # bin already added automatically
            run_env.prepend_path('PATH', join_path(self.projectdir, d))

    def setup_dependent_environment(self, spack_env, run_env, dependent_spec):
        """Provide location of the OpenFOAM project.
        This is identical to the WM_PROJECT_DIR value, but we avoid that
        variable since it would mask the normal OpenFOAM cleanup of
        previous versions.
        """
        spack_env.set('FOAM_PROJECT_DIR', self.projectdir)

    @property
    def projectdir(self):
        """Absolute location of project directory: WM_PROJECT_DIR/"""
        return self.prefix  # <- install directly under prefix

    @property
    def foam_arch(self):
        if not self._foam_arch:
            self._foam_arch = OpenfoamArch(self.spec, **self.config)
        return self._foam_arch

    @property
    def archbin(self):
        """Relative location of architecture-specific executables"""
        return join_path('platforms', self.foam_arch, 'bin')

    @property
    def archlib(self):
        """Relative location of architecture-specific libraries"""
        return join_path('platforms', self.foam_arch, 'lib')

    def rename_source(self):
        """This is fairly horrible.
        The github tarfiles have weird names that do not correspond to the
        canonical name. We need to rename these, but leave a symlink for
        spack to work with.
        """
        # Note that this particular OpenFOAM requires absolute directories
        # to build correctly!
        parent   = os.path.dirname(self.stage.source_path)
        original = os.path.basename(self.stage.source_path)
        target   = 'OpenFOAM-{0}'.format(self.version)
        # Could also grep through etc/bashrc for WM_PROJECT_VERSION
        with working_dir(parent):
            if original != target and not os.path.lexists(target):
                os.rename(original, target)
                os.symlink(target, original)
                tty.info('renamed {0} -> {1}'.format(original, target))

    def patch(self):
        """Adjust OpenFOAM build for spack.
           Where needed, apply filter as an alternative to normal patching."""
        self.rename_source()
        add_extra_files(self, self.common, self.assets)

        # Avoid WM_PROJECT_INST_DIR for ThirdParty, site or jobControl.
        # Use openfoam-site.patch to handle jobControl, site.
        #
        # Filtering: bashrc,cshrc (using a patch is less flexible)
        edits = {
            'WM_THIRD_PARTY_DIR':
            r'$WM_PROJECT_DIR/ThirdParty #SPACK: No separate third-party',
            'WM_VERSION': self.version,    # consistency
            'FOAMY_HEX_MESH': '',          # This is horrible (unset variable?)
        }
        rewrite_environ_files(  # Adjust etc/bashrc and etc/cshrc
            edits,
            posix=join_path('etc', 'bashrc'),
            cshell=join_path('etc', 'cshrc'))

    def configure(self, spec, prefix):
        """Make adjustments to the OpenFOAM configuration files in their various
        locations: etc/bashrc, etc/config.sh/FEATURE and customizations that
        don't properly fit get placed in the etc/prefs.sh file (similiarly for
        csh).
        """
        # Filtering bashrc, cshrc
        edits = {}
        edits.update(self.foam_arch.foam_dict())
        rewrite_environ_files(  # Adjust etc/bashrc and etc/cshrc
            edits,
            posix=join_path('etc', 'bashrc'),
            cshell=join_path('etc', 'cshrc'))

        # MPI content, with absolute paths
        user_mpi = mplib_content(spec)

        # Content for etc/prefs.{csh,sh}
        self.etc_prefs = {
            r'MPI_ROOT': spec['mpi'].prefix,  # Absolute
            r'MPI_ARCH_FLAGS': '"%s"' % user_mpi['FLAGS'],
            r'MPI_ARCH_INC':   '"%s"' % user_mpi['PINC'],
            r'MPI_ARCH_LIBS':  '"%s"' % user_mpi['PLIBS'],
        }

        # Content for etc/config.{csh,sh}/ files
        self.etc_config = {
            'CGAL': {},
            'scotch': {},
            'metis': {},
            'paraview': [],
            'gperftools': [],  # Currently unused
        }

        if True:
            self.etc_config['scotch'] = {
                'SCOTCH_ARCH_PATH': spec['scotch'].prefix,
                # For src/parallel/decompose/Allwmake
                'SCOTCH_VERSION': 'scotch-{0}'.format(spec['scotch'].version),
            }

        # Write prefs files according to the configuration.
        # Only need prefs.sh for building, but install both for end-users
        if self.etc_prefs:
            write_environ(
                self.etc_prefs,
                posix=join_path('etc', 'prefs.sh'),
                cshell=join_path('etc', 'prefs.csh'))

        # Adjust components to use SPACK variants
        for component, subdict in self.etc_config.items():
            write_environ(
                subdict,
                posix=join_path('etc', 'config.sh',  component),
                cshell=join_path('etc', 'config.csh', component))

    def build(self, spec, prefix):
        """Build using the OpenFOAM Allwmake script, with a wrapper to source
        its environment first.
        Only build if the compiler is known to be supported.
        """
        self.foam_arch.has_rule(self.stage.source_path)
        self.foam_arch.create_rules(self.stage.source_path, self)

        args = []
        if self.parallel:  # Build in parallel? - pass via the environment
            os.environ['WM_NCOMPPROCS'] = str(make_jobs)
        builder = Executable(self.build_script)
        builder(*args)

    def install(self, spec, prefix):
        """Install under the projectdir"""
        mkdirp(self.projectdir)
        projdir = os.path.basename(self.projectdir)
        # Filtering: bashrc, cshrc
        edits = {
            'WM_PROJECT_INST_DIR': os.path.dirname(self.projectdir),
            'WM_PROJECT_DIR': join_path('$WM_PROJECT_INST_DIR', projdir),
        }

        # All top-level files, except spack build info and possibly Allwmake
        if '+source' in spec:
            ignored = re.compile(r'^spack-.*')
        else:
            ignored = re.compile(r'^(Allwmake|spack-).*')

        files = [
            f for f in glob.glob("*")
            if os.path.isfile(f) and not ignored.search(f)
        ]
        for f in files:
            install(f, self.projectdir)

        # Having wmake and ~source is actually somewhat pointless...
        # Install 'etc' before 'bin' (for symlinks)
        dirs = ['etc', 'bin', 'wmake']
        if '+source' in spec:
            dirs.extend(['applications', 'src', 'tutorials'])

        for d in dirs:
            install_tree(
                d,
                join_path(self.projectdir, d),
                symlinks=True)

        dirs = ['platforms']
        if '+source' in spec:
            dirs.extend(['doc'])

        # Install platforms (and doc) skipping intermediate targets
        ignored = ['src', 'applications', 'html', 'Guides']
        for d in dirs:
            install_tree(
                d,
                join_path(self.projectdir, d),
                ignore=shutil.ignore_patterns(*ignored),
                symlinks=True)

        etc_dir = join_path(self.projectdir, 'etc')
        rewrite_environ_files(  # Adjust etc/bashrc and etc/cshrc
            edits,
            posix=join_path(etc_dir, 'bashrc'),
            cshell=join_path(etc_dir, 'cshrc'))
        self.install_links()

    def install_links(self):
        """Add symlinks into bin/, lib/ (eg, for other applications)"""
        # Make build log visible - it contains OpenFOAM-specific information
        with working_dir(self.projectdir):
            os.symlink(
                join_path('.spack', 'build.out'),
                join_path('log.' + str(self.foam_arch)))

        if not self.config['link']:
            return

        # ln -s platforms/linux64GccXXX/lib lib
        with working_dir(self.projectdir):
            if os.path.isdir(self.archlib):
                os.symlink(self.archlib, 'lib')

        # (cd bin && ln -s ../platforms/linux64GccXXX/bin/* .)
        with working_dir(join_path(self.projectdir, 'bin')):
            for f in [
                f for f in glob.glob(join_path('..', self.archbin, "*"))
                if os.path.isfile(f)
            ]:
                os.symlink(f, os.path.basename(f))

# -----------------------------------------------------------------------------