#! /usr/bin/env python
# encoding: utf-8
# mittorn, 2018

from waflib import Logs, Configure
from waflib.extras import gitversion
import os

top = '.'

TGMATH_H_TEST = '''#include <tgmath.h>
const float val = 2, val2 = 3;
int main(void){ return (int)(-asin(val) + cos(val2)); }'''

STRNCASECMP_TEST = '''#include <string.h>
int main(int argc, char **argv) { return strncasecmp(argv[1], argv[2], 10); }'''

STRCASECMP_TEST = '''#include <string.h>
int main(int argc, char **argv) { return strcasecmp(argv[1], argv[2]); }'''

STRCASESTR_TEST = '''#include <string.h>
int main(int argc, char **argv) { argv[0] = strcasestr(argv[1], argv[2]); return 0; }'''

STRCHRNUL_TEST = '''#include <string.h>
int main(int argc, char **argv) { argv[2] = strchrnul(argv[1], 'x'); return 0; }'''

STRLCPY_TEST = '''#include <string.h>
int main(int argc, char **argv) { return strlcpy(argv[1], argv[2], 10); }'''

STRLCAT_TEST = '''#include <string.h>
int main(int argc, char **argv) { return strlcat(argv[1], argv[2], 10); }'''

STRNLEN_TEST = '''#include <string.h>
int main(int argc, char **argv) { return (int)strnlen(argv[0], 10); }
'''

ALLOCA_TEST = '''#include <%s>
int main(void) { alloca(1); return 0; }'''

HEADER_TEST = '''#include <%s>
int main(void) { return 0; }
'''

def options(opt):
	# stub
	return

def header_frag(header_name):
	return '#include <%s>' % header_name + EMPTY_PROGRAM

@Configure.conf
def export_define(conf, define, value=1):
	if not value:
		return
	if value is True:
		value = 1 # so python won't define it as string True

	conf.env.EXPORT_DEFINES_LIST += ['%s=%s' % (define, value)]

@Configure.conf
def simple_check(conf, fragment, msg, mandatory=False, **kw):
	return conf.check_cc(fragment=fragment, msg='Checking for %s' % msg, mandatory=mandatory, **kw)

@Configure.conf
def get_git_commit_date(conf):
	node = conf.srcnode.find_node('.git')

	if not node:
		Logs.debug('can\'t find .git in conf.srcnode')
		return None

	return gitversion.run_git(conf, ['log', '-1', '--format=%ci'])

def options(opt):
	pass

def configure(conf):
	# private to libpublic
	conf.load('gitversion')

	conf.start_msg('Git commit date')
	conf.env.GIT_COMMIT_DATE = conf.get_git_commit_date()
	conf.end_msg(conf.env.GIT_COMMIT_DATE)

	# need to expose it for everyone using libpublic headers
	conf.env.EXPORT_DEFINES_LIST = []
	conf.export_define('_CRT_SILENCE_NONCONFORMING_TGMATH_H', conf.env.COMPILER_CC == 'msvc')
	conf.export_define('_GNU_SOURCE', conf.env.DEST_OS != 'win32')

	# create temporary uselib that just enables extensions
	conf.env.DEFINES_export = list(conf.env.EXPORT_DEFINES_LIST)

	# check platform-specific header name for alloca(3)
	if conf.env.DEST_OS == 'win32':
		# don't waste time on Win32, it's documented to be always in malloc.h.
		# (plus test can fail because alloca is underscore-prefixed, e.g. _alloca)
		conf.export_define('ALLOCA_H', '<malloc.h>')
	elif conf.simple_check(ALLOCA_TEST % 'alloca.h', msg='alloca in alloca.h'):
		conf.export_define('ALLOCA_H', '<alloca.h>')
	elif conf.simple_check(ALLOCA_TEST % 'malloc.h', msg='alloca in malloc.h'):
		conf.export_define('ALLOCA_H', '<malloc.h>')
	elif conf.simple_check(ALLOCA_TEST % 'stdlib.h', msg='alloca in stdlib.h'):
		conf.export_define('ALLOCA_H', '<stdlib.h>')

	# save some time on Windows, msvc is too slow
	# these calls must be available with both msvc and mingw
	if conf.env.DEST_OS == 'win32':
		conf.export_define('HAVE_TGMATH_H', conf.simple_check(TGMATH_H_TEST, 'tgmath.h', use='M werror export'))
		conf.export_define('HAVE_STRNICMP')
		conf.export_define('HAVE_STRICMP')
	else:
		exports_list = []

		def check_libc_extension(frag, msg, define):
			exports_list.append(define)
			return {'fragment': frag, 'msg': 'Checking for ' + msg, 'define_name': define, 'mandatory': False, 'use': 'M werror export', 'compiler': 'c'}

		conf.multicheck(
			check_libc_extension(TGMATH_H_TEST, 'tgmath.h', 'HAVE_TGMATH_H'),
			check_libc_extension(STRNCASECMP_TEST, 'strncasecmp', 'HAVE_STRNCASECMP'),
			check_libc_extension(STRCASECMP_TEST, 'strcasecmp', 'HAVE_STRCASECMP'),
			check_libc_extension(STRCASESTR_TEST, 'strcasestr', 'HAVE_STRCASESTR'),
			check_libc_extension(STRCHRNUL_TEST, 'strchrnul', 'HAVE_STRCHRNUL'),
			check_libc_extension(STRLCPY_TEST, 'strlcpy', 'HAVE_STRLCPY'),
			check_libc_extension(STRLCAT_TEST, 'strlcat', 'HAVE_STRLCAT'),
			check_libc_extension(STRNLEN_TEST, 'strnlen', 'HAVE_STRNLEN'),
		)

		for export in exports_list:
			if conf.env[export]:
				conf.export_define(export)

	# kill temporary uselib
	del conf.env.DEFINES_export

def build(bld):
	bld(name = 'sdk_includes',
		export_includes = '. ../common ../pm_shared ../engine',
		export_defines = bld.env.EXPORT_DEFINES_LIST,
		use = 'library_suffix_includes')

	# build it separately to slightly improve rebuild times
	bld.stlib(source = 'build_vcs.c',
		target = 'build_vcs',
		defines = ['XASH_BUILD_COMMIT=\"%s\"' % bld.env.GIT_VERSION, 'XASH_BUILD_BRANCH=\"%s\"' % bld.env.GIT_BRANCH, 'XASH_BUILD_COMMIT_DATE=\"%s\"' % bld.env.GIT_COMMIT_DATE])

	bld.stlib(source = bld.path.ant_glob('*.c', excl='build_vcs.c'),
		target = 'public',
		use = 'sdk_includes werror build_vcs')

	if bld.env.TESTS:
		tests = {
			'strings': 'tests/test_strings.c',
			'build': 'tests/test_build.c',
			'filebase': 'tests/test_filebase.c',
			'fileext': 'tests/test_fileext.c',
			'efp': 'tests/test_efp.c',
			'atoi': 'tests/test_atoi.c',
			'parsefile': 'tests/test_parsefile.c',
		}

		for i in tests:
			bld.program(features = 'test',
				source = tests[i],
				target = 'test_%s' % i,
				use = 'public',
				install_path = None)
