import python ;
import feature ;
import feature : feature ;
import project ;
import targets ;
import "class" : new ;
import modules ;

use-project /torrent : ../.. ;

BOOST_ROOT = [ modules.peek : BOOST_ROOT ] ;

CXXFLAGS = [ modules.peek : CXXFLAGS ] ;
LDFLAGS = [ modules.peek : LDFLAGS ] ;

ECHO "CXXFLAGS =" $(CXXFLAGS) ;
ECHO "LDFLAGS =" $(LDFLAGS) ;

# this is used to make bjam use the same version of python which is executing setup.py

feature libtorrent-link : shared static prebuilt : composite propagated ;

feature libtorrent-python-pic : off on : composite propagated link-incompatible ;
feature.compose <libtorrent-python-pic>on : <cxxflags>-fPIC ;

# when invoking the install_module target, this feature can be specified to
# install the python module to a specific directory
feature python-install-path : : free path ;

# when not specifying a custom install path, this controls whether to install
# the python module in the system directory or user-specific directory
feature python-install-scope : user system : ;

# copied from boost 1.63's boost python jamfile
rule find-py3-version
{
	local BOOST_VERSION_TAG = [ modules.peek boostcpp : BOOST_VERSION_TAG ] ;
	if $(BOOST_VERSION_TAG) >= 1_67
	{
		# starting with boost 1.67.0 boost python no longer define a separate
		# target for python3 (boost_python3) so then we just use the regular
		# boost_python target
		return ;
	}
	local versions = [ feature.values python ] ;
	local py3ver ;
	for local v in $(versions)
	{
		if $(v) >= 3.0
		{
			py3ver = $(v) ;
		}
	}
	return $(py3ver) ;
}

if $(BOOST_ROOT)
{
	use-project /boost : $(BOOST_ROOT) ;
	alias boost_python : /boost/python//boost_python : : : <include>$(BOOST_ROOT) ;
	if [ find-py3-version ]
	{
		alias boost_python3 : /boost/python//boost_python3 : : : <include>$(BOOST_ROOT) ;
	}
	else
	{
		alias boost_python3 : boost_python ;
	}
}
else
{
	local boost-lib-search-path =
		<search>/opt/local/lib
		<search>/usr/lib
		<search>/usr/local/lib
		<search>/sw/lib
		<search>/usr/g++/lib
		<search>/opt/homebrew/lib
		;

	local boost-include-path =
		<include>/opt/local/include
		<include>/opt/homebrew/include
		<include>/usr/local/include
		<include>/usr/sfw/include
	;

	import version ;

	rule boost_python_version ( name : type ? : properties * )
	{
		# examples of names for the boost_python library:
		# ubuntu bionic (1.65.1): libboost_python3-py36.so.1.65.1
		# ubuntu bionic (1.65):   libboost_python-py36.so
		#                         libboost_python3-py36.so
		#                         libboost_python3.so
		# ubuntu bionic (1.62.0): libboost_python-py36.so.1.62.0
		# ubuntu focal (1.67.0):  libboost_python38.so.1.67.0
		# ubuntu focal (1.71.0):  libboost_python38.so
		# ubuntu groovy (1.71.0): libboost_python38.so
		# ubuntu hirsute(1.71.0): libboost_python39.so
		# debian buster (1.67.0): libboost_python37.so
		#                         libboost_python3.so
		#                         libboost_python3-py37.so
		# debian sid (1.74.0):    libboost_python39.so
		# debian sid (1.71.0):    libboost_python39.so
		# debian bullseye (1.71): libboost_python39.so
		# devian buster-backports (1.71): libboost_python37.so
		# debian buster (1.67):   libboost_python37.so.1.67.0
		# debian stretch (1.62.0): libboost_python-py35.so.1.62.0
		# debian stretch (1.62):  libboost_python-py35.so
		# debian jessie (1.55.0): libboost_python-py34.so.1.55.0
		# boost Jamfile:          libboost_python38.so.1.73.0

		local py-version-str = [ $(properties).get <python> ] ;
		local py-version = "" ;
		local infix = "" ;
		if $(py-version-str) {
			py-version = [ SPLIT_BY_CHARACTERS $(py-version-str) : "." ] ;

			if [ version.version-less $(py-version) : 3 7 ] && [ $(properties).get <target-os> ] = linux
			{
				infix = "-py" ;
			}
		}
		local boost-python-lib = "boost_python" $(infix) $(py-version) ;

		if $(type) in SEARCHED_LIB
		{
			return $(boost-python-lib:J) ;
		}
		return ;
	}

	lib boost_python : : <tag>@boost_python_version $(boost-lib-search-path) : : $(boost-include-path) ;
	alias boost_python3 : boost_python ;
}

lib prebuilt_libtorrent : : <name>torrent-rasterbar : : <include>../../include ;
lib prebuilt_libtorrent : : <target-os>windows <name>torrent : : <include>../../include ;

rule libtorrent_linking ( properties * )
{
	local result ;

	# allow larger .obj files (with more sections)
	if <toolset>msvc in $(properties) || <toolset>intel-win in $(properties)
	{
		# allow larger .obj files (with more sections)
		result += <cxxflags>/bigobj ;
	}

	if <toolset>gcc in $(properties) && <target-os>windows in $(properties)
	{
		# allow larger .obj files (with more sections)
		result += <cxxflags>-Wa,-mbig-obj ;
	}

	if ! <target-os>windows in $(properties)
		&& <toolset>gcc in $(properties)
		&& <libtorrent-link>static in $(properties)
	{
		result += <libtorrent-python-pic>on ;
	}

	if <toolset>gcc in $(properties)
		|| <toolset>darwin in $(properties)
		|| <toolset>clang in $(properties)
		|| <toolset>clang-darwin in $(properties)
	{
		# hide non-external symbols
		result += <cxxflags>-fvisibility=hidden ;
		result += <cxxflags>-fvisibility-inlines-hidden ;

		if ( <toolset>gcc in $(properties) )
		{
			 result += <linkflags>-Wl,-Bsymbolic ;
		}
	}

	if <link>static in $(properties)
	{
		ECHO "WARNING: you probably want to specify libtorrent-link=static rather than link=static" ;
	}

	local BOOST_VERSION_TAG = [ modules.peek boostcpp : BOOST_VERSION_TAG ] ;
	if <boost-link>static in $(properties) && $(BOOST_VERSION_TAG) < 1_74 && <target-os>linux in $(properties)
	{
		ECHO "WARNING: you cannot link statically against boost-python on linux before version 1.74.0, because it links against pthread statically in that case, which is not allowed" ;
	}

	local boost_python_lib ;

	for local prop in $(properties)
	{
		switch $(prop)
		{
			case <python>2.* : boost_python_lib = boost_python ;
			case <python>3.* : boost_python_lib = boost_python3 ;
		}
	}

	if ! $(boost_python_lib)
	{
		ECHO "WARNING: unknown python version" ;
		boost_python_lib = boost_python ;
	}

	# linux must link dynamically against boost python because it pulls
	# in libpthread, which must be linked dynamically since we're building a .so
	# (the static build of libpthread is not position independent)
	if <boost-link>shared in $(properties) || ( <target-os>linux in $(properties) && $(BOOST_VERSION_TAG) < 1_74 )
	{
		result += <library>$(boost_python_lib)/<link>shared/<warnings>off ;
	}
	else
	{
		result += <library>$(boost_python_lib)/<link>static/<warnings>off ;
	}

	if <libtorrent-link>shared in $(properties)
	{
		result += <library>/torrent//torrent/<link>shared ;
	}
	else if <libtorrent-link>static in $(properties)
	{
		result += <library>/torrent//torrent/<link>static ;
	}
	else
	{
		result += <library>prebuilt_libtorrent ;
	}

	return $(result) ;
}

# this is a copy of the rule from boost-build's python-extension, but without
# specifying <suppress-import-lib>no as a mandatory property. That property
# would otherwise cause build failures because it suppresses linking against the
# runtime library and kernel32 on windows

rule my-python-extension ( name : sources * : requirements * : default-build * :
	usage-requirements * )
{
	requirements += <use>/python//python_for_extensions ;

	local project = [ project.current ] ;

	targets.main-target-alternative
		[ new typed-target $(name) : $(project) : PYTHON_EXTENSION
			: [ targets.main-target-sources $(sources) : $(name) ]
			: [ targets.main-target-requirements $(requirements) : $(project) ]
			: [ targets.main-target-default-build $(default-build) : $(project) ]
		] ;
}

my-python-extension libtorrent
	: # sources
	src/module.cpp
	src/sha1_hash.cpp
	src/sha256_hash.cpp
	src/info_hash.cpp
	src/converters.cpp
	src/create_torrent.cpp
	src/fingerprint.cpp
	src/utility.cpp
	src/session.cpp
	src/entry.cpp
	src/torrent_info.cpp
	src/string.cpp
	src/torrent_handle.cpp
	src/torrent_status.cpp
	src/session_settings.cpp
	src/version.cpp
	src/alert.cpp
	src/datetime.cpp
	src/peer_info.cpp
	src/ip_filter.cpp
	src/magnet_uri.cpp
	src/error_code.cpp
	src/load_torrent.cpp
	: # requirements
	<include>src
	<toolset>gcc:<cxxflags>-Wno-deprecated-declarations
	<toolset>darwin:<cxxflags>-Wno-deprecated-declarations
	<toolset>darwin:<cxxflags>-Wno-unused-command-line-argument
	<conditional>@libtorrent_linking
	<crypto>openssl:<library>/torrent//ssl
	<crypto>openssl:<library>/torrent//crypto
	<cxxflags>"$(CXXFLAGS:J= )"
	<linkflags>"$(LDFLAGS:J= )"
	# C4268: 'identifier' : 'const' static/global data initialized
	#		with compiler generated default constructor fills the object with zeros
	<toolset>msvc:<cxxflags>/wd4268
	: # default-build
	<warnings>all
	<cxxstd>14
	: # usage-requirements
	<suppress-import-lib>false
	;

rule python-install-dir ( properties * )
{
	local install-dir = [ feature.get-values python-install-path : $(properties) ] ;
	if ( $(install-dir) != "" )
	{
		# if the user has provided an install location, use that one
		return <location>$(install-dir) ;
	}

	local python-interpreter = [ feature.get-values python.interpreter : $(properties) ] ;
	if ( $(python-interpreter) = "" )
	{
		return <location>. ;
	}

	# sys.path are defined differently between python2 and python3

	local python-path ;
	if <python-install-scope>system in $(properties)
	{
		python-path = [ SHELL "$(python-interpreter) -c \"import distutils.sysconfig; import sys; sys.stdout.write(distutils.sysconfig.get_python_lib())\"" ] ;
	}
	else
	{
		python-path = [ SHELL "$(python-interpreter) -c \"import site; import sys; sys.stdout.write(site.USER_SITE)\"" ] ;
	}

	if $(python-path) = ""
	{
		return <location>. ;
	}

	ECHO "python install directory:" $(python-path) ;
	return <location>$(python-path) ;
}

install install_module
	: libtorrent
	: <conditional>@python-install-dir
	<install-type>PYTHON_EXTENSION
	;

explicit install_module ;

install stage_module
	: libtorrent
	: <location>.
	<install-type>PYTHON_EXTENSION
	: <cxxstd>14
	;

install stage_dependencies
	: /torrent//torrent
	boost_python
	boost_python3
	: <location>dependencies
	<install-dependencies>on
	<install-type>SHARED_LIB
	: <cxxstd>14
	;

explicit stage_module ;
explicit stage_dependencies ;