import os, string, sys, subprocess

Import('env')

boost_env = env.Clone()

modules = ['thread','program_options', 'system', 'date_time']

target_os = env.get('TARGET_OS')
target_arch = env.get('TARGET_ARCH')
src_dir = env.get('SRC_DIR')

boost_version   = '1.60.0'

# TODO: Remove coupling between build scripts and 1_58_0 version for Android
if target_os in ['android']:
    boost_version   = '1.58.0'

boost_base_name  = 'boost_'+string.replace(boost_version,'.','_')
boost_arch_name  = boost_base_name+'.tar.bz2'
boost_b2_name    = boost_base_name+os.sep+'b2'
boost_url       = 'http://downloads.sourceforge.net/project/boost/boost/'+boost_version+'/'+boost_arch_name+'?r=&ts=1421801329&use_mirror=iweb'

boost_dir = os.path.join(src_dir,'extlibs','boost','boost')
boost_bootstrap = os.path.join(boost_dir,'bootstrap.bat')

if 'linux' == target_os :
    # Check for Boost libraries in /usr/boost
    print 'TODO: Perform platform check for linux'
    raise SCons.Errors.EnvironmentError('Unsupported platform')

elif target_os in ['windows']:
    boost_zip_file   = os.path.join(src_dir,'extlibs','boost',boost_arch_name)

    if not os.path.exists(boost_bootstrap):

        # Download if necessary
        if os.path.exists(boost_zip_file):
            boost_zip = boost_zip_file
        else:
            print '*** Downloading Boost zip file (> 100MB). Please wait... ***'
            boost_zip = env.Download(boost_zip_file, boost_url)

        # Unzip boost
        print '*** Unpacking boost %s zip file ... ***' % boost_version
        env.UnpackAll(boost_dir, boost_zip)

        # Rename from boost_1_60_0 -> boost
        os.rename(boost_base_name, 'boost')

    # Sanity check, in case the above method didn't work
    if not os.path.exists(boost_bootstrap):
        print '''
*********************************** Error: ****************************************
* Please download boost from the following website:
*
*   ''' + boost_url + '''
*
* and extract the contents directly into
*
*    ''' + boost_dir + '''
*
* such that this build system can find:
*
* ''' + boost_bootstrap + '''
*
***********************************************************************************
'''
        Exit(1)

elif target_os in ['android']:
    env.Tool('URLDownload',    toolpath=['../../tools/scons'])
    env.Tool('UnpackAll',      toolpath=['../../tools/scons'])
    env.Tool('BoostBootstrap', toolpath=['../../tools/scons'])
    env.Tool('BoostBuild',     toolpath=['../../tools/scons'])

    host_os = sys.platform

    if host_os == 'linux2' :
        boost_bootstrap = boost_base_name+os.sep+'bootstrap.sh'
    else :
        msg="Host platform (%s) is currently not supported for boost builds" % host_os
        raise SCons.Errors.EnvironmentError(msg)

    if not os.path.exists(boost_arch_name) and not os.path.exists(boost_base_name):
        boost_arch_name = env.URLDownload(boost_arch_name, boost_url)

    if not os.path.exists(boost_base_name):
	boost_arch_name = env.UnpackAll(boost_bootstrap, boost_arch_name)

    boost_b2  = env.BoostBootstrap(boost_b2_name, boost_arch_name)

    dep_sys_root = env['DEP_SYS_ROOT']
    dep_src_dir =  dep_sys_root + os.sep + 'include'
    dep_lib_dir =  dep_sys_root + os.sep + 'lib'

    boost_targets = [
        os.path.join(dep_src_dir, 'boost', 'config.hpp'),
        os.path.join(dep_src_dir, 'boost', 'variant.hpp'),
        os.path.join(dep_src_dir, 'boost', 'program_options.hpp'),
        os.path.join(dep_src_dir, 'boost', 'thread.hpp'),
        os.path.join(dep_src_dir, 'boost', 'date_time.hpp'),
        os.path.join(dep_src_dir, 'libboost_thread.a'),        
        os.path.join(dep_src_dir, 'libboost_date_time.a'),
        os.path.join(dep_src_dir, 'libboost_atomic.a'),
        os.path.join(dep_src_dir, 'libboost_system.a'),
        os.path.join(dep_src_dir, 'libboost_program_options.a')
        ]

    boost_build = env.BoostBuild(boost_targets, boost_b2, PREFIX=dep_sys_root, MODULES=modules)