##########################################################################
#
# Copyright 2015 Samsung Electronics All Rights Reserved.
#
#
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
##########################################################################

##
# This script includes generic build options:
#    release/debug, target os, target arch, cross toolchain, build environment etc
##
import os
import platform

print "Inside the Config SConscript"
# Map of host os and allowed target os (host: allowed target os)
host_target_map = {
        'linux': ['linux', 'android', 'arduino', 'yocto', 'tizen'],
        'windows': ['windows', 'winrt', 'android', 'arduino', 'tizen'],
        'darwin': ['darwin', 'ios', 'android', 'arduino'],
        }

# Map of os and allowed archs (os: allowed archs)
os_arch_map = {
        'linux': ['x86', 'x86_64', 'arm', 'arm64'],
        'android': ['x86', 'x86_64', 'armeabi', 'armeabi-v7a', 'armeabi-v7a-hard', 'arm64-v8a'],
        'windows': ['x86', 'amd64', 'arm'],
        'winrt': ['arm'],
        'darwin': ['i386', 'x86_64'],
        'ios': ['i386', 'x86_64', 'armv7', 'armv7s', 'arm64'],
        'arduino': ['avr', 'arm'],
                'yocto': ['x86', 'x86_64'],
        'tizen': ['armv7'],
        }

host = platform.system().lower()

if not host_target_map.has_key(host):
    print "\nError: Current system (%s) isn't supported\n" % host
    Exit(1)

######################################################################
# Get build options (the optins from command line)
######################################################################
target_os = ARGUMENTS.get('TARGET_OS', host).lower() # target os

if target_os not in host_target_map[host]:
    print "\nError: Unknown target os: %s (Allow values: %s)\n" % (target_os, host_target_map[host])
    Exit(1)

default_arch = platform.machine()
if default_arch not in os_arch_map[target_os]:
    default_arch = os_arch_map[target_os][0].lower()

target_arch = ARGUMENTS.get('TARGET_ARCH', default_arch) # target arch

######################################################################
# Common build options (release, target os, target arch)
######################################################################
help_vars = Variables()
help_vars.Add(BoolVariable('RELEASE', 'Build for release?', True)) # set to 'no', 'false' or 0 for debug
help_vars.Add(EnumVariable('TARGET_OS', 'Target platform', host, host_target_map[host]))
help_vars.Add(ListVariable('TARGET_TRANSPORT', 'Target transport', 'ALL', ['ALL', 'IP', 'BT', 'BLE']))
help_vars.Add(EnumVariable('TARGET_ARCH', 'Target architecture', default_arch, os_arch_map[target_os]))
help_vars.Add(EnumVariable('SECURED', 'Build with DTLS', '0', allowed_values=('0', '1')))
help_vars.Add(EnumVariable('ROUTING', 'Enable routing', 'EP', allowed_values=('GW', 'EP')))

######################################################################
# Platform(build target) specific options: SDK/NDK & toolchain
######################################################################
targets_support_cc = ['tizen']

if target_os in targets_support_cc:
    # Set cross compile toolchain
    help_vars.Add('TC_PREFIX', "Toolchain prefix (Generally only be required for cross-compiling)", os.environ.get('TC_PREFIX'))
    help_vars.Add(PathVariable('TC_PATH',
            'Toolchain path (Generally only be required for cross-compiling)',
            os.environ.get('TC_PATH')))

if target_os in ['android', 'arduino']: # Android/Arduino always uses GNU compiler regardless of the host
    env = Environment(variables = help_vars,
            tools = ['gnulink', 'gcc', 'g++', 'ar', 'as']
            )
else:
    env = Environment(variables = help_vars, TARGET_ARCH = target_arch, TARGET_OS = target_os)

Help(help_vars.GenerateHelpText(env))

tc_set_msg = '''
************************************ Warning **********************************
*   Enviornment variable TC_PREFIX/TC_PATH is set. It will change the default *
* toolchain, if it isn't what you expect you should unset it, otherwise it may*
* cause inexplicable errors.                                                  *
*******************************************************************************
'''

if target_os in targets_support_cc:
    prefix = env.get('TC_PREFIX')
    tc_path = env.get('TC_PATH')
    if prefix:
        env.Replace(CC = prefix + 'gcc')
        env.Replace(CXX = prefix + 'g++')
        env.Replace(AR = prefix + 'ar')
        env.Replace(AS = prefix + 'as')
        env.Replace(LINK = prefix + 'ld')
        env.Replace(RANLIB = prefix + 'ranlib')

    if tc_path:
        env.PrependENVPath('PATH', tc_path)
        sys_root = os.path.abspath(tc_path + '/../')
        env.AppendUnique(CCFLAGS = ['--sysroot=' + sys_root])
        env.AppendUnique(LINKFLAGS = ['--sysroot=' + sys_root])

    if prefix or tc_path:
        print tc_set_msg

# Ensure scons be able to change its working directory
env.SConscriptChdir(1)

# Set the source directory and build directory
#   Source directory: 'dir'
#   Build directory: 'dir'/out/<target_os>/<target_arch>/<release or debug>/
#
# You can get the directory as following:
#   env.get('SRC_DIR')
#   env.get('BUILD_DIR')

def __set_dir(env, dir):
    if not os.path.exists(dir + '/SConstruct'):
        print '''
*************************************** Error *********************************
* The directory(%s) seems isn't a source code directory, no SConstruct file is
* found. *
*******************************************************************************
''' % dir
        Exit(1)

    if env.get('RELEASE'):
        build_dir = dir + '/out/' + target_os + '/' + target_arch + '/release/'
    else:
        build_dir = dir + '/out/' + target_os + '/' + target_arch + '/debug/'
    env.VariantDir(build_dir, dir, duplicate=0)

    env.Replace(BUILD_DIR = build_dir)
    env.Replace(SRC_DIR = dir)

def __src_to_obj(env, src, home = ''):
    obj = env.get('BUILD_DIR') + src.replace(home, '')
    if env.get('OBJSUFFIX'):
        obj += env.get('OBJSUFFIX')
    return env.Object(obj, src)

def __install(ienv, targets, name):
    i_n = ienv.Install(env.get('BUILD_DIR'), targets)
    Alias(name, i_n)
    env.AppendUnique(TS = [name])

def __append_target(ienv, target):
    env.AppendUnique(TS = [target])

def __print_targets(env):
    Help('''
===============================================================================
Targets:\n    ''')
    for t in env.get('TS'):
        Help(t + ' ')
    Help('''
\nDefault all targets will be built. You can specify the target to build:

    $ scons [options] [target]
===============================================================================
''')

env.AddMethod(__set_dir, 'SetDir')
env.AddMethod(__print_targets, 'PrintTargets')
env.AddMethod(__src_to_obj, 'SrcToObj')
env.AddMethod(__append_target, 'AppendTarget')
env.AddMethod(__install, 'InstallTarget')
env.SetDir(env.GetLaunchDir())
env['ROOT_DIR']=env.GetLaunchDir()

env.AppendUnique(CPPDEFINES = ['TB_LOG'])
if env.get('ROUTING') == 'GW':
    env.AppendUnique(CPPDEFINES = ['ROUTING_GATEWAY'])
elif env.get('ROUTING') == 'EP':
    env.AppendUnique(CPPDEFINES = ['ROUTING_EP'])
env.AppendUnique(CPPDEFINES = ['__TIZEN__'])

Export('env')

######################################################################
# continue with the regular build process. Load config of target os
######################################################################
env.SConscript(target_os + '/SConscript')

# Delete the temp files of configuration
if env.GetOption('clean'):
    dir = env.get('SRC_DIR')

    if os.path.exists(dir + '/config.log'):
        Execute(Delete(dir + '/config.log'))
        Execute(Delete(dir + '/.sconsign.dblite'))
        Execute(Delete(dir + '/.sconf_temp'))

Return('env')

