##
# Copyright 2009-2021 Ghent University
#
# This file is part of EasyBuild,
# originally created by the HPC team of Ghent University (http://ugent.be/hpc/en),
# with support of Ghent University (http://ugent.be/hpc),
# the Flemish Supercomputer Centre (VSC) (https://www.vscentrum.be),
# Flemish Research Foundation (FWO) (http://www.fwo.be/en)
# and the Department of Economy, Science and Innovation (EWI) (http://www.ewi-vlaanderen.be/en).
#
# https://github.com/easybuilders/easybuild
#
# EasyBuild is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation v2.
#
# EasyBuild 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
# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
# along with EasyBuild.  If not, see <http://www.gnu.org/licenses/>.
##
"""
EasyBuild support for building and installing Gate, implemented as an easyblock

@author: Stijn De Weirdt (Ghent University)
@author: Dries Verdegem (Ghent University)
@author: Kenneth Hoste (Ghent University)
@author: Pieter De Baets (Ghent University)
@author: Jens Timmerman (Ghent University)
@author: Toon Willems (Ghent University)
"""
import os
import shutil
from distutils.version import LooseVersion

import easybuild.tools.toolchain as toolchain
from easybuild.easyblocks.generic.cmakemake import CMakeMake
from easybuild.framework.easyconfig import CUSTOM
from easybuild.tools.build_log import EasyBuildError
from easybuild.tools.run import run_cmd
from easybuild.tools.systemtools import get_shared_lib_ext


class EB_GATE(CMakeMake):
    """Support for building/installing GATE."""

    @staticmethod
    def extra_options():
        extra_vars = CMakeMake.extra_options()
        extra_vars.update({
            'default_platform': ['openPBS', "Default cluster platform to set", CUSTOM],
        })
        # Out of source build doesn't work due to sub tools beeing 'make'd
        extra_vars['separate_build_dir'][0] = False
        return extra_vars

    def __init__(self, *args, **kwargs):
        """Initialise class variables."""
        super(EB_GATE, self).__init__(*args, **kwargs)
        self.g4system = None
        self.gate_subdirs = [
            '.',
            os.path.join('cluster_tools', 'filemerger'),
            os.path.join('cluster_tools', 'jobsplitter'),
        ]

    def configure_step(self):
        """Custom configure procedure for GATE: CMake for versions 6.2 or more recent."""

        if LooseVersion(self.version) >= '6.2':
            super(EB_GATE, self).configure_step()

    def build_step(self):
        """Custom build procedure for GATE, including cluster tools."""

        if LooseVersion(self.version) < '6.2':
            # build procedure for versions older than v6.2: source env_gate.sh and run 'make'
            env_gate_script = os.path.join(self.cfg['start_dir'], 'env_gate.sh')
            self.cfg['prebuildopts'] = "source %s && %s " % (env_gate_script, self.cfg['prebuildopts'])

        if LooseVersion(self.version) <= '6.2':
            if self.toolchain.comp_family() in [toolchain.INTELCOMP]:
                # include missing library path in linker command
                self.cfg.update('buildopts', 'LD="$CXX -L$EBROOTICC/compiler/lib/intel64"')

        # redefine $CFLAGS/$CXXFLAGS via options to build command ('make')
        cflags = os.getenv('CFLAGS')
        cxxflags = "%s -DGC_DEFAULT_PLATFORM='\\\"%s\\\"'" % (os.getenv('CXXFLAGS'), self.cfg['default_platform'])
        if self.toolchain.comp_family() in [toolchain.INTELCOMP]:
            # make sure GNU macros are defined by Intel compiler
            cflags += " -gcc"
            cxxflags += " -gcc"

        # make sure right compilers and compiler options are used for building
        make_opts = {
            'CC': os.getenv('CC'),
            'CFLAGS': cflags,
            'CXX': os.getenv('CXX'),
            'CXXFLAGS': cxxflags,
            # filemerger Makefile hardcodes $LD to g++, so make sure right compiler is used for linking
            'LD': os.getenv('CXX'),
        }
        for key in sorted(make_opts):
            self.cfg.update('buildopts', '%s="%s"' % (key, make_opts[key]))

        for subdir in self.gate_subdirs:
            try:
                os.chdir(os.path.join(os.path.join(self.cfg['start_dir'], subdir)))
            except OSError as err:
                raise EasyBuildError("Failed to move to %s: %s", subdir, err)

            super(EB_GATE, self).build_step()

        try:
            os.chdir(self.cfg['start_dir'])
        except OSError as err:
            raise EasyBuildError("Failed to return to start dir %s: %s", self.cfg['start_dir'], err)

    def install_step(self):
        """Custom installation procedure for GATE."""

        if LooseVersion(self.version) >= '6.2':
            # make sure installation prefix is honored (for cluster tools, requires Makefile patch)
            self.cfg.update('installopts', 'PREFIX=%(installdir)s')

            for subdir in self.gate_subdirs:
                try:
                    os.chdir(os.path.join(os.path.join(self.cfg['start_dir'], subdir)))
                except OSError as err:
                    raise EasyBuildError("Failed to move to %s: %s", subdir, err)

                super(EB_GATE, self).install_step()
        else:
            # manually copy files for versions prior to v6.2

            # copy all the things
            try:
                shutil.rmtree(self.installdir)
                shutil.copytree(self.cfg['start_dir'], self.installdir)
            except OSError as err:
                raise EasyBuildError("Failed to copy %s to %s: %s", self.cfg['start_dir'], self.installdir, err)

            cmd = "source %s &> /dev/null && echo $G4SYSTEM" % os.path.join(self.cfg['start_dir'], 'env_gate.sh')
            out, _ = run_cmd(cmd, simple=False)
            self.g4system = out.strip()
            if self.g4system:
                self.log.debug("Value obtained for $G4SYSTEM: %s" % self.g4system)
            else:
                raise EasyBuildError("Failed to obtain value for $G4SYSTEM, not set?")

            # copy Gate libraries to 'lib' subdir in installation directory
            try:
                shlib_ext = get_shared_lib_ext()
                libdir = os.path.join(self.installdir, "lib")
                os.mkdir(libdir)
                srclibdir = os.path.join(self.cfg['start_dir'], "tmp", self.g4system, "Gate")
                for fil in os.listdir(srclibdir):
                    if fil.endswith('.%s' % shlib_ext):
                        shutil.copy2(os.path.join(srclibdir, fil), os.path.join(libdir, fil))
                        self.log.debug("Copied library %s to 'lib' install subdirectory" % fil)
            except OSError as err:
                raise EasyBuildError("Failed to copy GATE library/ies to lib directory: %s", err)

            # add link from tmp/<OS>-<comp>/gjs to lib
            js_dir = os.path.join(self.installdir, 'cluster_tools', 'jobsplitter')
            try:
                os.symlink(os.path.join(js_dir, 'tmp', self.g4system, 'gjs'), os.path.join(js_dir, 'lib'))
            except OSError as err:
                raise EasyBuildError("Failed to symlink tmp js dir to lib in %s: %s", js_dir, err)

    def make_module_extra(self):
        """Overwritten from Application to add extra txt"""
        subdir = os.getenv('G4SYSTEM', '')
        txt = super(EB_GATE, self).make_module_extra()
        path_dirs = []
        fm_bin = os.path.join('cluster_tools', 'filemerger', 'bin', subdir)
        js_dir = os.path.join('cluster_tools', 'jobsplitter')
        js_bin = os.path.join(js_dir, 'bin', subdir)
        for path_dir in [os.path.join('bin', subdir), fm_bin, js_bin]:
            if os.path.exists(os.path.join(self.installdir, path_dir)):
                path_dirs.append(path_dir)
        txt += self.module_generator.prepend_paths('PATH', path_dirs)
        txt += self.module_generator.prepend_paths('LD_LIBRARY_PATH', [os.path.join(js_dir, 'lib')])
        txt += self.module_generator.set_environment('GATEHOME', self.installdir)
        txt += self.module_generator.set_environment('GC_GATE_EXE_DIR', os.path.join(self.installdir, 'bin', subdir))
        return txt

    def sanity_check_step(self):
        """Custom sanity check for GATE."""

        if LooseVersion(self.version) >= '6.2':
            subdir = ''
            extra_files = ["bin/gjm", "bin/gjs"]
            dirs = []
            if LooseVersion(self.version) < '7.0':
                extra_files += ["Utilities/itkzlib/%s" % x for x in ['itk_zlib_mangle.h', 'zconf.h',
                                                                     'zlibDllConfig.h', 'zlib.h']]
                extra_files += ["Utilities/MetaIO/%s" % x for x in ['localMetaConfiguration.h', 'metaDTITube.h',
                                                                    'metaImage.h', 'metaMesh.h', 'metaTubeGraph.h',
                                                                    'metaUtils.h']]
        else:
            subdir = self.g4system
            extra_files = [
                os.path.join('cluster_tools', 'filemerger', 'bin', subdir, 'gjm'),
                os.path.join('cluster_tools', 'jobsplitter', 'bin', subdir, 'gjs'),
                'lib/libGate.%s' % get_shared_lib_ext(),
            ]
            dirs = ['benchmarks', 'examples']

        custom_paths = {
            'files': [os.path.join('bin', subdir, 'Gate')] + extra_files,
            'dirs': dirs,
        }
        custom_commands = ["gjs -h | grep 'This executable is compiled with %s as default'"
                           % self.cfg['default_platform']]
        super(EB_GATE, self).sanity_check_step(custom_paths=custom_paths, custom_commands=custom_commands)
