#!/usr/bin/python
# build_native.py
# Build native codes


import sys
import os, os.path
import shutil
from optparse import OptionParser

def get_num_of_cpu():
	''' The build process can be accelerated by running multiple concurrent job processes using the -j-option.
	'''
	try:
		platform = sys.platform
		if platform == 'win32':
			if 'NUMBER_OF_PROCESSORS' in os.environ:
				return int(os.environ['NUMBER_OF_PROCESSORS'])
			else:
				return 1
		else:
			from numpy.distutils import cpuinfo
			return cpuinfo.cpu._getNCPUs()
	except Exception:
		print "Can't know cpuinfo, use default 1 cpu"
		return 1

def check_environment_variables_sdk():
    ''' Checking the environment ANDROID_SDK_ROOT, which will be used for building
    '''

    try:
        SDK_ROOT = os.environ['ANDROID_SDK_ROOT']
    except Exception:
        print "ANDROID_SDK_ROOT not defined. Please define ANDROID_SDK_ROOT in your environment"
        sys.exit(1)

    return SDK_ROOT

def check_environment_variables():
    ''' Checking the environment NDK_ROOT, which will be used for building
    '''

    try:
        NDK_ROOT = os.environ['NDK_ROOT']
    except Exception:
        print "NDK_ROOT not defined. Please define NDK_ROOT in your environment"
        sys.exit(1)

    return NDK_ROOT

def select_toolchain_version():
    '''Because ndk-r8e uses gcc4.6 as default. gcc4.6 doesn't support c++11. So we should select gcc4.7 when
    using ndk-r8e. But gcc4.7 is removed in ndk-r9, so we should determine whether gcc4.7 exist.
    Conclution:
    ndk-r8e  -> use gcc4.7
    ndk-r9   -> use gcc4.8
    '''

    ndk_root = check_environment_variables()
    if os.path.isdir(os.path.join(ndk_root,"toolchains/arm-linux-androideabi-4.8")):
        os.environ['NDK_TOOLCHAIN_VERSION'] = '4.8'
        print "The Selected NDK toolchain version was 4.8 !"
    elif os.path.isdir(os.path.join(ndk_root,"toolchains/arm-linux-androideabi-4.7")):
        os.environ['NDK_TOOLCHAIN_VERSION'] = '4.7'
        print "The Selected NDK toolchain version was 4.7 !"
    else:
        print "Couldn't find the gcc toolchain."
        exit(1)

def do_build(cocos_root, ndk_root, app_android_root,ndk_build_param,sdk_root,android_platform,build_mode):

    ndk_path = os.path.join(ndk_root, "ndk-build")

    num_of_cpu = get_num_of_cpu()
	
    if ndk_build_param == None:
        command = '%s -j%d -C %s NDK_DEBUG=%d' % (ndk_path, num_of_cpu, app_android_root, build_mode=='debug')
    else:
        command = '%s -j%d -C %s NDK_DEBUG=%d %s' % (ndk_path, num_of_cpu, app_android_root, build_mode=='debug', ' '.join(str(e) for e in ndk_build_param))
    if os.system(command) != 0:
        raise Exception("Build dynamic library for project [ " + app_android_root + " ] fails!")
    elif android_platform is not None:
    	  sdk_tool_path = os.path.join(sdk_root, "tools/android")
    	  cocoslib_path = os.path.join(cocos_root, "cocos/platform/android/java")
    	  command = '%s update lib-project -t %s -p %s' % (sdk_tool_path,android_platform,cocoslib_path) 
    	  if os.system(command) != 0:
    	  	  raise Exception("update cocos lib-project [ " + cocoslib_path + " ] fails!")  	  
    	  command = '%s update project -t %s -p %s -s' % (sdk_tool_path,android_platform,app_android_root)
    	  if os.system(command) != 0:
    	  	  raise Exception("update project [ " + app_android_root + " ] fails!")    	  	  
    	  buildfile_path = os.path.join(app_android_root, "build.xml")
    	  command = 'ant clean %s -f %s -Dsdk.dir=%s' % (build_mode,buildfile_path,sdk_root)
    	  os.system(command)

def copy_files(src, dst):

    for item in os.listdir(src):
        path = os.path.join(src, item)
        # Android can not package the file that ends with ".gz"
        if not item.startswith('.') and not item.endswith('.gz') and os.path.isfile(path):
            shutil.copy(path, dst)
        if os.path.isdir(path):
            new_dst = os.path.join(dst, item)
            os.mkdir(new_dst)
            copy_files(path, new_dst)

def copy_resources(app_android_root):

    # remove app_android_root/assets if it exists
    assets_dir = os.path.join(app_android_root, "assets")
    if os.path.isdir(assets_dir):
        shutil.rmtree(assets_dir)

    # copy resources
    os.mkdir(assets_dir)
    resources_dir = os.path.join(app_android_root, "../Resources")
    if os.path.isdir(resources_dir):
        copy_files(resources_dir, assets_dir)

def build(ndk_build_param,android_platform,build_mode):

    ndk_root = check_environment_variables()
    sdk_root = None
    select_toolchain_version()

    current_dir = os.path.dirname(os.path.realpath(__file__))
    cocos_root = os.path.join(current_dir, "../cocos2d")

    app_android_root = current_dir
    copy_resources(app_android_root)
    
    if android_platform is not None:
				sdk_root = check_environment_variables_sdk()
				if android_platform.isdigit():
						android_platform = 'android-'+android_platform
				else:
						print 'please use vaild android platform'
						exit(1)
		
    if build_mode is None:
    	  build_mode = 'debug'
    elif build_mode != 'release':
        build_mode = 'debug'
    
    do_build(cocos_root, ndk_root, app_android_root,ndk_build_param,sdk_root,android_platform,build_mode)

# -------------- main --------------
if __name__ == '__main__':

    parser = OptionParser()
    parser.add_option("-n", "--ndk", dest="ndk_build_param", help='parameter for ndk-build', action="append")
    parser.add_option("-p", "--platform", dest="android_platform", 
    help='parameter for android-update.Without the parameter,the script just build dynamic library for project. Valid android-platform are:[10|11|12|13|14|15|16|17|18|19]')
    parser.add_option("-b", "--build", dest="build_mode", 
    help='the build mode for java project,debug[default] or release.Get more information,please refer to http://developer.android.com/tools/building/building-cmdline.html')
    (opts, args) = parser.parse_args()
    
    build(opts.ndk_build_param,opts.android_platform,opts.build_mode)
