# -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-

import os
import subprocess
from waflib import Context, Logs

VERSION = '0.5.0'
APPNAME = 'PSync'
GIT_TAG_PREFIX = ''

BOOST_COMPRESSION_CODE = '''
#include <boost/iostreams/filter/{0}.hpp>
int main() {{ boost::iostreams::{0}_compressor test; }}
'''
COMPRESSION_SCHEMES = ['zlib', 'gzip', 'bzip2', 'lzma', 'zstd']

def options(opt):
    opt.load(['compiler_cxx', 'gnu_dirs'])
    opt.load(['default-compiler-flags',
              'coverage', 'sanitizers', 'boost',
              'doxygen', 'sphinx'],
             tooldir=['.waf-tools'])

    optgrp = opt.add_option_group('PSync Options')
    optgrp.add_option('--with-examples', action='store_true', default=False,
                      help='Build examples')
    optgrp.add_option('--with-tests', action='store_true', default=False,
                      help='Build unit tests')

    for scheme in COMPRESSION_SCHEMES:
        optgrp.add_option(f'--without-{scheme}', action='store_true', default=False,
                          help=f'Disable support for {scheme} (de)compression')

def configure(conf):
    conf.load(['compiler_cxx', 'gnu_dirs',
               'default-compiler-flags', 'boost',
               'doxygen', 'sphinx'])

    conf.env.WITH_EXAMPLES = conf.options.with_examples
    conf.env.WITH_TESTS = conf.options.with_tests

    conf.find_program('dot', mandatory=False)

    # Prefer pkgconf if it's installed, because it gives more correct results
    # on Fedora/CentOS/RHEL/etc. See https://bugzilla.redhat.com/show_bug.cgi?id=1953348
    # Store the result in env.PKGCONFIG, which is the variable used inside check_cfg()
    conf.find_program(['pkgconf', 'pkg-config'], var='PKGCONFIG')

    pkg_config_path = os.environ.get('PKG_CONFIG_PATH', f'{conf.env.LIBDIR}/pkgconfig')
    conf.check_cfg(package='libndn-cxx', args=['libndn-cxx >= 0.9.0', '--cflags', '--libs'],
                   uselib_store='NDN_CXX', pkg_config_path=pkg_config_path)

    conf.check_boost(lib='iostreams', mt=True)
    if conf.env.BOOST_VERSION_NUMBER < 107100:
        conf.fatal('The minimum supported version of Boost is 1.71.0.\n'
                   'Please upgrade your distribution or manually install a newer version of Boost.\n'
                   'For more information, see https://redmine.named-data.net/projects/nfd/wiki/Boost')

    for scheme in COMPRESSION_SCHEMES:
        if getattr(conf.options, f'without_{scheme}'):
            continue
        conf.check_cxx(fragment=BOOST_COMPRESSION_CODE.format(scheme),
                       use='BOOST', execute=False, mandatory=False,
                       msg=f'Checking for {scheme} support in boost iostreams',
                       define_name=f'HAVE_{scheme.upper()}')

    if conf.env.WITH_TESTS:
        conf.check_boost(lib='unit_test_framework', mt=True, uselib_store='BOOST_TESTS')

    conf.check_compiler_flags()

    # Loading "late" to prevent tests from being compiled with profiling flags
    conf.load('coverage')
    conf.load('sanitizers')

    # If there happens to be a static library, waf will put the corresponding -L flags
    # before dynamic library flags.  This can result in compilation failure when the
    # system has a different version of the PSync library installed.
    conf.env.prepend_value('STLIBPATH', ['.'])

    conf.define_cond('WITH_TESTS', conf.env.WITH_TESTS)
    # The config header will contain all defines that were added using conf.define()
    # or conf.define_cond().  Everything that was added directly to conf.env.DEFINES
    # will not appear in the config header, but will instead be passed directly to the
    # compiler on the command line.
    conf.write_config_header('PSync/detail/config.hpp', define_prefix='PSYNC_')

def build(bld):
    bld.shlib(
        target='PSync',
        vnum=VERSION,
        cnum=VERSION,
        source=bld.path.ant_glob('PSync/**/*.cpp'),
        use='BOOST NDN_CXX',
        includes='.',
        export_includes='.')

    if bld.env.WITH_TESTS:
        bld.recurse('tests')

    if bld.env.WITH_EXAMPLES:
        bld.recurse('examples')

    # Install header files
    headers = bld.path.ant_glob('PSync/**/*.hpp')
    bld.install_files('${INCLUDEDIR}', headers, relative_trick=True)
    bld.install_files('${INCLUDEDIR}/PSync/detail', 'PSync/detail/config.hpp')

    bld(features='subst',
        source='PSync.pc.in',
        target='PSync.pc',
        install_path='${LIBDIR}/pkgconfig',
        VERSION=VERSION)

def docs(bld):
    from waflib import Options
    Options.commands = ['doxygen', 'sphinx'] + Options.commands

def doxygen(bld):
    version(bld)

    if not bld.env.DOXYGEN:
        bld.fatal('Cannot build documentation ("doxygen" not found in PATH)')

    bld(features='subst',
        name='doxygen.conf',
        source=['docs/doxygen.conf.in',
                'docs/named_data_theme/named_data_footer-with-analytics.html.in'],
        target=['docs/doxygen.conf',
                'docs/named_data_theme/named_data_footer-with-analytics.html'],
        VERSION=VERSION,
        HAVE_DOT='YES' if bld.env.DOT else 'NO',
        HTML_FOOTER='../build/docs/named_data_theme/named_data_footer-with-analytics.html' \
                        if os.getenv('GOOGLE_ANALYTICS', None) \
                        else '../docs/named_data_theme/named_data_footer.html',
        GOOGLE_ANALYTICS=os.getenv('GOOGLE_ANALYTICS', ''))

    bld(features='doxygen',
        doxyfile='docs/doxygen.conf',
        use='doxygen.conf')

def sphinx(bld):
    version(bld)

    if not bld.env.SPHINX_BUILD:
        bld.fatal('Cannot build documentation ("sphinx-build" not found in PATH)')

    bld(features='sphinx',
        config='docs/conf.py',
        outdir='docs',
        source=bld.path.ant_glob('docs/**/*.rst'),
        version=VERSION_BASE,
        release=VERSION)

def version(ctx):
    # don't execute more than once
    if getattr(Context.g_module, 'VERSION_BASE', None):
        return

    Context.g_module.VERSION_BASE = Context.g_module.VERSION
    Context.g_module.VERSION_SPLIT = VERSION_BASE.split('.')

    # first, try to get a version string from git
    version_from_git = ''
    try:
        cmd = ['git', 'describe', '--abbrev=8', '--always', '--match', f'{GIT_TAG_PREFIX}*']
        version_from_git = subprocess.run(cmd, capture_output=True, check=True, text=True).stdout.strip()
        if version_from_git:
            if GIT_TAG_PREFIX and version_from_git.startswith(GIT_TAG_PREFIX):
                Context.g_module.VERSION = version_from_git[len(GIT_TAG_PREFIX):]
            elif not GIT_TAG_PREFIX and ('.' in version_from_git or '-' in version_from_git):
                Context.g_module.VERSION = version_from_git
            else:
                # no tags matched (or we are in a shallow clone)
                Context.g_module.VERSION = f'{VERSION_BASE}+git.{version_from_git}'
    except (OSError, subprocess.SubprocessError):
        pass

    # fallback to the VERSION.info file, if it exists and is not empty
    version_from_file = ''
    version_file = ctx.path.find_node('VERSION.info')
    if version_file is not None:
        try:
            version_from_file = version_file.read().strip()
        except OSError as e:
            Logs.warn(f'{e.filename} exists but is not readable ({e.strerror})')
    if version_from_file and not version_from_git:
        Context.g_module.VERSION = version_from_file
        return

    # update VERSION.info if necessary
    if version_from_file == Context.g_module.VERSION:
        # already up-to-date
        return
    if version_file is None:
        version_file = ctx.path.make_node('VERSION.info')
    try:
        version_file.write(Context.g_module.VERSION)
    except OSError as e:
        Logs.warn(f'{e.filename} is not writable ({e.strerror})')

def dist(ctx):
    ctx.algo = 'tar.xz'
    version(ctx)

def distcheck(ctx):
    ctx.algo = 'tar.xz'
    version(ctx)