import itertools
import os
import re
from collections import OrderedDict
from copy import copy

try:
	string_types = basestring
except NameError:
	string_types = str


# search any file, not just executables
def WhereIsFile(file, paths):
	for d in paths:
		f = os.path.join(d, file)
		if os.path.isfile(f):
			try:
				st = os.stat(f)
			except OSError:
				# os.stat() raises OSError, not IOError if the file
				# doesn't exist, so in this case we let IOError get
				# raised so as to not mask possibly serious disk or
				# network issues.
				continue
			return os.path.normpath(f)
	return None

def FlattenLibs(libs):
	if isinstance(libs, string_types):
		return [libs]
	else:
		return [item for sublibs in libs for item in FlattenLibs(sublibs)]

# removes all but the *LAST* occurance of a lib in the list
def RemoveDuplicateLibs(libs):
	libs = FlattenLibs(libs)
	# remove empty strings from list
	libs = list(filter(lambda x: x != '', libs))
	return list(reversed(OrderedDict.fromkeys(reversed(libs))))

Import('env')

def WorkaroundFreeBSDLibOrder(libs):
	# lib(re)ssl includes (weak) arc4random functions
	# which "on purpose" might conflict with those in libc
	# => link libc first solves this
	# (required for FreeBSD11 fullstatic build)
	import platform
	if ('c' in libs) and (platform.system() == 'FreeBSD'):
		return ['c'] + libs
	return libs

def GatherLibs(env, *libs):
	libs = RemoveDuplicateLibs(env['LIBS'] + list(libs) + [env['APPEND_LIBS']])
	return WorkaroundFreeBSDLibOrder(libs)

common_src = Split("base64.c buffer.c burl.c log.c \
	http_header.c http_kv.c keyvalue.c chunk.c  \
	http_chunk.c fdevent.c fdevent_fdnode.c gw_backend.c \
	stat_cache.c http_etag.c array.c \
	algo_md5.c algo_sha1.c algo_splaytree.c \
	configfile-glue.c \
	http-header-glue.c \
	http_cgi.c \
	http_date.c \
	plugin.c \
	reqpool.c \
	request.c \
	sock_addr.c \
	rand.c \
	fdlog_maint.c \
	fdlog.c \
	sys-setjmp.c \
	ck.c \
")

src = Split("server.c response.c connections.c h1.c \
	sock_addr_cache.c \
	fdevent_impl.c \
	http_range.c \
	network.c \
	network_write.c \
	data_config.c \
	configfile.c configparser.c")

builtin_mods = Split(" \
  mod_rewrite.c \
  mod_redirect.c \
  mod_access.c \
  mod_alias.c \
  mod_indexfile.c \
  mod_staticfile.c \
  mod_setenv.c \
  mod_expire.c \
  mod_simple_vhost.c \
  mod_evhost.c \
  mod_fastcgi.c \
  mod_scgi.c \
  ")

lemon = env.Program('lemon', 'lemon.c', LIBS = GatherLibs(env))

def Lemon(env, input):
	parser = env.Command([input.replace('.y', '.c'),input.replace('.y', '.h')], input, lemon[0].path + ' -q -dsconsbuild/build -Tsrc/lempar.c $SOURCE')
	env.Depends(parser, lemon)

configparser = Lemon(env, 'configparser.y')

## the modules and how they are built
modules = {
	'mod_accesslog' : { 'src' : [ 'mod_accesslog.c' ] },
	'mod_ajp13' : { 'src' : [ 'mod_ajp13.c' ] },
	'mod_auth' : { 'src' : [ 'mod_auth.c', 'mod_auth_api.c' ], 'lib' : [ env['LIBCRYPTO'] ] },
	'mod_authn_file' : { 'src' : [ 'mod_authn_file.c' ], 'lib' : [ env['LIBCRYPT'], env['LIBCRYPTO'] ] },
	'mod_cgi' : { 'src' : [ 'mod_cgi.c' ] },
	'mod_deflate' : { 'src' : [ 'mod_deflate.c' ], 'lib' : [ env['LIBZ'], env['LIBZSTD'], env['LIBBZ2'], env['LIBBROTLI'], env['LIBDEFLATE'], 'm' ] },
	'mod_dirlisting' : { 'src' : [ 'mod_dirlisting.c' ] },
	'mod_extforward' : { 'src' : [ 'mod_extforward.c' ] },
	'mod_h2' : { 'src' : [ 'h2.c', 'ls-hpack/lshpack.c', 'algo_xxhash.c' ], 'lib' : [ env['LIBXXHASH'] ] },
	'mod_proxy' : { 'src' : [ 'mod_proxy.c' ] },
	'mod_rrdtool' : { 'src' : [ 'mod_rrdtool.c' ] },
	'mod_sockproxy' : { 'src' : [ 'mod_sockproxy.c' ] },
	'mod_ssi' : { 'src' : [ 'mod_ssi.c' ] },
	'mod_status' : { 'src' : [ 'mod_status.c' ] },
	'mod_userdir' : { 'src' : [ 'mod_userdir.c' ] },
	'mod_vhostdb' : { 'src' : [ 'mod_vhostdb.c', 'mod_vhostdb_api.c' ] },
	'mod_webdav' : { 'src' : [ 'mod_webdav.c' ], 'lib' : [ env['LIBXML2'], env['LIBSQLITE3'], env['LIBUUID'] ] },
	'mod_wstunnel' : { 'src' : [ 'mod_wstunnel.c' ], 'lib' : [ env['LIBCRYPTO'] ] },
}

if env['with_maxminddb']:
	modules['mod_maxminddb'] = { 'src' : [ 'mod_maxminddb.c' ], 'lib' : [ env['LIBMAXMINDDB'] ] }

if env['with_krb5']:
	modules['mod_authn_gssapi'] = { 'src' : [ 'mod_authn_gssapi.c' ], 'lib' : [ env['LIBKRB5'], env['LIBGSSAPI_KRB5'] ] }

if env['with_ldap']:
	modules['mod_authn_ldap'] = { 'src' : [ 'mod_authn_ldap.c' ], 'lib' : [ env['LIBLDAP'], env['LIBLBER'] ] }
	modules['mod_vhostdb_ldap'] = { 'src' : [ 'mod_vhostdb_ldap.c' ], 'lib' : [ env['LIBLDAP'], env['LIBLBER'] ] }

if env['with_lua']:
	modules['mod_magnet'] = {
		'src' : [ 'mod_magnet.c', 'mod_magnet_cache.c', 'algo_hmac.c' ],
		'lib' : [ env['LIBLUA'], env['LIBCRYPTO'] ]
	}

if env['with_pam']:
	modules['mod_authn_pam'] = { 'src' : [ 'mod_authn_pam.c' ], 'lib' : [ env['LIBPAM'] ] }

if env['with_mysql']:
	modules['mod_vhostdb_mysql'] = { 'src' : [ 'mod_vhostdb_mysql.c' ], 'lib' : [ env['LIBMYSQL'] ] }

if env['with_pgsql']:
	modules['mod_vhostdb_pgsql'] = { 'src' : [ 'mod_vhostdb_pgsql.c' ], 'lib' : [ env['LIBPGSQL'] ] }

if env['with_dbi']:
	modules['mod_authn_dbi'] = { 'src' : [ 'mod_authn_dbi.c' ], 'lib' : [ env['LIBCRYPT'], env['LIBDBI'], env['LIBCRYPTO'] ] }
	modules['mod_vhostdb_dbi'] = { 'src' : [ 'mod_vhostdb_dbi.c' ], 'lib' : [ env['LIBDBI'] ] }

if env['with_sasl']:
	modules['mod_authn_sasl'] = { 'src' : [ 'mod_authn_sasl.c' ], 'lib' : [ env['LIBSASL'] ] }

if env['with_openssl']:
	modules['mod_openssl'] = { 'src' : [ 'mod_openssl.c' ], 'lib' : [ env['LIBSSL'], env['LIBSSLCRYPTO'] ] }

if env['with_wolfssl']:
	modules['mod_wolfssl'] = { 'src' : [ 'mod_wolfssl.c' ], 'lib' : [ env['LIBWOLFSSL'], 'm' ] }

if env['with_mbedtls']:
	modules['mod_mbedtls'] = { 'src' : [ 'mod_mbedtls.c' ], 'lib' : [ env['LIBMBEDTLS'], env['LIBMBEDX509'], env['LIBMBEDCRYPTO'] ] }

if env['with_nss']:
	modules['mod_nss'] = { 'src' : [ 'mod_nss.c' ], 'lib' : [ env['LIBNSS'] ] }

if env['with_gnutls']:
	modules['mod_gnutls'] = { 'src' : [ 'mod_gnutls.c' ], 'lib' : [ env['LIBGNUTLS'] ] }

staticenv = env.Clone(CPPFLAGS=[ env['CPPFLAGS'], '-DLIGHTTPD_STATIC' ])

## all the core-sources + the modules
staticsrc = src + common_src

staticlib = copy(env['LIBS'])
staticinit = ''
staticsrc += builtin_mods
for module in builtin_mods:
	staticinit += "PLUGIN_INIT(%s)\n"%module[0:-2]
for module in modules.keys():
	if module == "mod_h2":
		continue
	staticsrc += modules[module]['src']
	staticinit += "PLUGIN_INIT(%s)\n"%module
	if 'lib' in modules[module]:
		staticlib += modules[module]['lib']

def WriteStaticPluginHeader(target, source, env):
	do_write = True
	data = env['STATICINIT']
	# only touch the file if content actually changes
	try:
		with open(target[0].abspath, 'r') as f:
			do_write = (data != f.read())
	except IOError:
		pass
	if do_write:
		with open(target[0].abspath, 'w+') as f:
			f.write(env['STATICINIT'])

env['STATICINIT'] = staticinit
staticheader = env.AlwaysBuild(env.Command('plugin-static.h', [], WriteStaticPluginHeader))

## turn all src-files into objects
staticobj = []
static_plugin_obj = None
for cfile in staticsrc:
	if cfile == 'plugin.c':
		static_plugin_obj = [ staticenv.Object('static-' + cfile.replace('.c', ''), cfile) ]
		staticobj += static_plugin_obj
	else:
		staticobj += [ staticenv.Object('static-' + cfile.replace('.c', ''), cfile) ]
env.Depends(static_plugin_obj, 'plugin-static.h')

## includes all modules, but links dynamically against other libs
staticbin = staticenv.Program('../static/build/lighttpd',
	staticobj,
	LIBS = GatherLibs(env, env['LIBPCRE'], staticlib)
	)

## you might have to adjust the list of libs and the order for your setup
## this is tricky, be warned
fullstaticlib = []

## try to calculate the libs for fullstatic with ldd
## 1. find the lib
## 2. check the deps
## 3. add them to the libs
#searchlibs = os.pathsep.join([ '/lib/', '/usr/lib/', '/usr/local/lib/' ])
searchlibs = []
searchpathre = re.compile(r'\bSEARCH_DIR\("=([^"]+)"\)')
f = os.popen('ld --verbose | grep SEARCH_DIR', 'r')
for aword in searchpathre.findall(f.read()):
	searchlibs += [ aword]
f.close

lddre = re.compile(r'^\s+lib([^=-]+)(?:-[\.0-9]+)?\.so\.[0-9]+ =>', re.MULTILINE)
for libs in staticlib:
	if isinstance(libs, string_types): libs = [ libs ]
	for lib in libs:
		fullstaticlib += [ lib ]
		solibpath = WhereIsFile('lib' + lib + '.so', paths = searchlibs)
		if solibpath is None:
			continue

		f = os.popen('ldd ' + solibpath, 'r')
		for aword in lddre.findall(f.read()):
			fullstaticlib += [ aword ]
		f.close

## glibc pthread needs to be linked completely (especially nptl-init.o)
## or not at all, or else pthread structures may not be initialized correctly
import platform
fullstatic_libs = GatherLibs(env, env['LIBPCRE'], fullstaticlib)
fullstatic_linkflags = [staticenv['LINKFLAGS'], '-static']
if (('pthread' in fullstatic_libs) or ('pcre' in fullstatic_libs)) and (platform.system() == 'Linux'):
	fullstatic_linkflags += ['-Wl,--whole-archive','-lpthread','-Wl,--no-whole-archive']
	if 'pthread' in fullstatic_libs:
		fullstatic_libs.remove('pthread')
if 'gcc_s' in fullstatic_libs:
	fullstatic_linkflags += ['-static-libgcc']
	fullstatic_libs.remove('gcc_s')

## includes all modules, linked statically
fullstaticbin = staticenv.Program('../fullstatic/build/lighttpd',
	staticobj,
	LIBS = fullstatic_libs,
	LINKFLAGS= fullstatic_linkflags
	)

Alias('static', staticbin)
Alias('fullstatic', fullstaticbin)

implib = 'lighttpd.exe.a'
bin_targets = ['lighttpd']
bin_linkflags = [ env['LINKFLAGS'] ]
if env['COMMON_LIB'] == 'lib':
	common_lib = env.SharedLibrary('liblighttpd', common_src, LINKFLAGS = [ env['LINKFLAGS'], '-Wl,--export-dynamic' ])
else:
	src += common_src
	common_lib = []
	if env['COMMON_LIB'] == 'bin':
		bin_linkflags += [ '-Wl,--export-all-symbols', '-Wl,--out-implib=build/' + implib ]
		bin_targets += [ implib ]
	else:
		bin_linkflags += [ '-Wl,--export-dynamic' ]

instbin = env.Program(bin_targets, src + builtin_mods, LINKFLAGS = bin_linkflags,
	LIBS = GatherLibs(
		env,
		common_lib,
		env['LIBCRYPTO'],
		env['LIBDL'],
		env['LIBPCRE'],
		env['LIBXXHASH'],
	)
)
env.Depends(instbin, configparser)

if env['COMMON_LIB'] == 'bin':
	common_lib = instbin[1]

env['SHLIBPREFIX'] = ''
instlib = []
for module in modules.keys():
	libs = [ common_lib ]
	if 'lib' in modules[module]:
		libs +=  modules[module]['lib']
	instlib += env.SharedLibrary(module, modules[module]['src'], LIBS = GatherLibs(env, libs))
env.Alias('modules', instlib)

inst = []

if env['build_dynamic']:
	Default(instbin[0], instlib)
	inst += env.Install('${sbindir}', instbin[0])
	inst += env.Install('${libdir}', instlib)
	if env['COMMON_LIB'] == 'lib':
		Default(common_lib)
		inst += env.Install('${bindir}', common_lib)

if env['build_static']:
	Default(staticbin)
	inst += env.Install('${sbindir}', staticbin)

if env['build_fullstatic']:
	Default(fullstaticbin)
	inst += env.Install('${sbindir}', fullstaticbin)

env.Alias('dynamic', instbin)
# default all to be installed
env.Alias('install', inst)

pkgdir = '.'
tarname = env['package'] + '-' + env['version']