#!/usr/bin/env python3
import sys
import os
import subprocess

if os.name == 'nt':
	import colorama
	colorama.init()

def error(str):
	print('\n' + '\033[41m' + str + '\033[0m' + '\n')
	sys.exit(1)

def header(str):
	print('\n' + '\033[44m' + str + '\033[0m' + '\n')

def vprint(str):
	if args.verbose:
		print(str)

# Environment checks
if not sys.version_info >= (3, 5):
	error('Requires Python 3.5+')

if 'ANDROID_HOME' not in os.environ:
	error('Please add Android SDK path to ANDROID_HOME environment variable!')

try:
	subprocess.run(['java', '-version'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
except FileNotFoundError:
	error('Please install JDK and make sure \'java\' is available in PATH')

import argparse
import multiprocessing
import zipfile
import datetime
import errno
import shutil
import lzma
import base64
import tempfile

if 'ANDROID_NDK_HOME' in os.environ:
	ndk_build = os.path.join(os.environ['ANDROID_NDK_HOME'], 'ndk-build')
else:
	ndk_build = os.path.join(os.environ['ANDROID_HOME'], 'ndk-bundle', 'ndk-build')

cpu_count = multiprocessing.cpu_count()
gradlew = os.path.join('.', 'gradlew.bat' if os.name == 'nt' else 'gradlew')
archs = ['armeabi-v7a', 'x86']
keystore = 'release-key.jks'
config = {}

def mv(source, target):
	try:
		shutil.move(source, target)
	except:
		pass

def cp(source, target):
	try:
		shutil.copyfile(source, target)
		vprint('cp: {} -> {}'.format(source, target))
	except:
		pass

def rm(file):
	try:
		os.remove(file)
	except OSError as e:
		if e.errno != errno.ENOENT:
			raise

def mkdir(path, mode=0o777):
	try:
		os.mkdir(path, mode)
	except:
		pass

def mkdir_p(path, mode=0o777):
	os.makedirs(path, mode, exist_ok=True)

def zip_with_msg(zipfile, source, target):
	if not os.path.exists(source):
		error('{} does not exist! Try build \'binary\' and \'apk\' before zipping!'.format(source))
	zipfile.write(source, target)
	vprint('zip: {} -> {}'.format(source, target))

def collect_binary():
	for arch in archs:
		mkdir_p(os.path.join('native', 'out', arch))
		for bin in ['magisk', 'magiskinit', 'magiskboot', 'busybox', 'b64xz']:
			source = os.path.join('native', 'libs', arch, bin)
			target = os.path.join('native', 'out', arch, bin)
			mv(source, target)

def execv(cmd, redirect=None):
	return subprocess.run(cmd, stdout=redirect if redirect != None else STDOUT)

def system(cmd, redirect=None):
	return subprocess.run(cmd, shell=True, stdout=redirect if redirect != None else STDOUT)

def xz(data):
	return lzma.compress(data, preset=9, check=lzma.CHECK_NONE)

def sign_zip(unsigned, output, release):
	signer_name = 'zipsigner-3.0.jar'
	zipsigner = os.path.join('utils', 'build', 'libs', signer_name)

	if not os.path.exists(zipsigner):
		header('* Building ' + signer_name)
		proc = execv([gradlew, 'utils:shadowJar'])
		if proc.returncode != 0:
			error('Build {} failed!'.format(signer_name))

	header('* Signing Zip')

	if release:
		proc = execv(['java', '-jar', zipsigner, keystore, config['keyStorePass'], config['keyAlias'], config['keyPass'], unsigned, output])
	else:
		proc = execv(['java', '-jar', zipsigner, unsigned, output])

	if proc.returncode != 0:
		error('Signing zip failed!')

def sign_apk(source, target):
	# Find the latest build tools
	build_tool = os.path.join(os.environ['ANDROID_HOME'], 'build-tools',
		sorted(os.listdir(os.path.join(os.environ['ANDROID_HOME'], 'build-tools')))[-1])

	proc = execv([os.path.join(build_tool, 'zipalign'), '-vpf', '4', source, target], subprocess.DEVNULL)
	if proc.returncode != 0:
		error('Zipalign Magisk Manager failed!')

	# Find apksigner.jar
	apksigner = ''
	for root, dirs, files in os.walk(build_tool):
		if 'apksigner.jar' in files:
			apksigner = os.path.join(root, 'apksigner.jar')
			break
	if not apksigner:
		error('Cannot find apksigner.jar in Android SDK build tools')

	proc = execv(['java', '-jar', apksigner, 'sign', '--ks', keystore, '--ks-pass', 'pass:' + config['keyStorePass'],
		'--ks-key-alias', config['keyAlias'], '--key-pass', 'pass:' + config['keyPass'], target])
	if proc.returncode != 0:
		error('Release sign Magisk Manager failed!')

def binary_dump(src, out, var_name):
	out.write('const static unsigned char {}[] = {{'.format(var_name))
	for i, c in enumerate(xz(src.read())):
		if i % 16 == 0:
			out.write('\n')
		out.write('0x{:02X},'.format(c))
	out.write('\n};\n')
	out.flush()

def gen_update_binary():
	update_bin = []
	binary = os.path.join('native', 'out', 'armeabi-v7a', 'b64xz')
	if not os.path.exists(binary):
		error('Please build \'binary\' before zipping!')
	with open(binary, 'rb') as b64xz:
		update_bin.append('#! /sbin/sh\nEX_ARM=\'')
		update_bin.append(''.join("\\x{:02X}".format(c) for c in b64xz.read()))
	binary = os.path.join('native', 'out', 'x86', 'b64xz')
	with open(binary, 'rb') as b64xz:
		update_bin.append('\'\nEX_X86=\'')
		update_bin.append(''.join("\\x{:02X}".format(c) for c in b64xz.read()))
	binary = os.path.join('native', 'out', 'armeabi-v7a', 'busybox')
	with open(binary, 'rb') as busybox:
		update_bin.append('\'\nBB_ARM=')
		update_bin.append(base64.b64encode(xz(busybox.read())).decode('ascii'))
	binary = os.path.join('native', 'out', 'x86', 'busybox')
	with open(binary, 'rb') as busybox:
		update_bin.append('\nBB_X86=')
		update_bin.append(base64.b64encode(xz(busybox.read())).decode('ascii'))
		update_bin.append('\n')
	with open(os.path.join('scripts', 'update_binary.sh'), 'r') as script:
		update_bin.append(script.read())
	return ''.join(update_bin)

def build_binary(args):
	support_targets = {'magisk', 'magiskinit', 'magiskboot', 'busybox', 'b64xz'}
	if len(args.target) == 0:
		# If nothing specified, build everything
		args.target = support_targets
	else:
		args.target = set(args.target) & support_targets

	if len(args.target) == 0:
		return

	header('* Building binaries: ' + ' '.join(args.target))

	# Force update logging.h timestamp to trigger recompilation for the flags to make a difference
	os.utime(os.path.join('native', 'jni', 'include', 'logging.h'))

	# Basic flags
	base_flags = 'MAGISK_VERSION=\"{}\" MAGISK_VER_CODE={} MAGISK_DEBUG={}'.format(config['version'], config['versionCode'],
		'' if args.release else '-DMAGISK_DEBUG')

	if 'magisk' in args.target:
		# Magisk is special case as it is a dependency of magiskinit
		proc = system('{} -C native {} B_MAGISK=1 -j{}'.format(ndk_build, base_flags, cpu_count))
		if proc.returncode != 0:
			error('Build Magisk binary failed!')
		collect_binary()
		# Dump the binary to header
		for arch in archs:
			bin_file = os.path.join('native', 'out', arch, 'magisk')
			with open(os.path.join('native', 'out', arch, 'binaries_arch.h'), 'w') as out:
				with open(bin_file, 'rb') as src:
					binary_dump(src, out, 'magisk_xz')

	old_plat = False
	flags = base_flags

	if 'b64xz' in args.target:
		flags += ' B_BXZ=1'
		old_plat = True

	if 'magiskinit' in args.target:
		if not os.path.exists(os.path.join('native', 'out', 'x86', 'binaries_arch.h')):
			error('Build "magisk" before building "magiskinit"')
		if not os.path.exists(os.path.join('native', 'out', 'binaries.h')):
			error('Build stub APK before building "magiskinit"')
		flags += ' B_INIT=1'
		old_plat = True

	if 'magiskboot' in args.target:
		flags += ' B_BOOT=1'
		old_plat = True

	if old_plat:
		proc = system('{} -C native {} -j{}'.format(ndk_build, flags, cpu_count))
		if proc.returncode != 0:
			error('Build binaries failed!')
		collect_binary()

	new_plat = False
	flags = base_flags

	if 'busybox' in args.target:
		flags += ' B_BB=1'
		new_plat = True

	if new_plat:
		proc = system('{} -C native NEW_PLAT=1 {} -j{}'.format(ndk_build, flags, cpu_count))
		if proc.returncode != 0:
			error('Build binaries failed!')
		collect_binary()

def build_apk(args):
	header('* Building Magisk Manager')

	source = os.path.join('scripts', 'util_functions.sh')
	target = os.path.join('app', 'src', 'full', 'res', 'raw', 'util_functions.sh')
	cp(source, target)

	if args.release:
		proc = execv([gradlew, 'app:assembleFullRelease'])
		if proc.returncode != 0:
			error('Build Magisk Manager failed!')

		source = os.path.join('app', 'build', 'outputs', 'apk', 'full', 'release', 'app-full-release-unsigned.apk')
		target = os.path.join(config['outdir'], 'app-release.apk')
		sign_apk(source, target)
		rm(source)
	else:
		proc = execv([gradlew, 'app:assembleFullDebug'])
		if proc.returncode != 0:
			error('Build Magisk Manager failed!')

		source = os.path.join('app', 'build', 'outputs', 'apk', 'full', 'debug', 'app-full-debug.apk')
		target = os.path.join(config['outdir'], 'app-debug.apk')
		mv(source, target)

	header('Output: ' + target)

def build_stub(args):
	header('* Building stub Magisk Manager')

	if args.release:
		proc = execv([gradlew, 'app:assembleStubRelease'])
		if proc.returncode != 0:
			error('Build stub Magisk Manager failed!')

		source = os.path.join('app', 'build', 'outputs', 'apk', 'stub', 'release', 'app-stub-release-unsigned.apk')
		target = os.path.join(config['outdir'], 'stub-release.apk')
		sign_apk(source, target)
		rm(source)
	else:
		proc = execv([gradlew, 'app:assembleStubDebug'])
		if proc.returncode != 0:
			error('Build stub Magisk Manager failed!')

		source = os.path.join('app', 'build', 'outputs', 'apk', 'stub', 'debug', 'app-stub-debug.apk')
		target = os.path.join(config['outdir'], 'stub-debug.apk')
		mv(source, target)

	header('Output: ' + target)

	# Dump the stub APK to header
	mkdir(os.path.join('native', 'out'))
	with open(os.path.join('native', 'out', 'binaries.h'), 'w') as out:
		with open(target, 'rb') as src:
			binary_dump(src, out, 'manager_xz');

def build_snet(args):
	proc = execv([gradlew, 'snet:assembleRelease'])
	if proc.returncode != 0:
		error('Build snet extention failed!')
	source = os.path.join('snet', 'build', 'outputs', 'apk', 'release', 'snet-release-unsigned.apk')
	target = os.path.join(config['outdir'], 'snet.apk')
	# Re-compress the whole APK for smaller size
	with zipfile.ZipFile(target, 'w', compression=zipfile.ZIP_DEFLATED, allowZip64=False) as zout:
		with zipfile.ZipFile(source) as zin:
			for item in zin.infolist():
				zout.writestr(item.filename, zin.read(item))
	rm(source)
	header('Output: ' + target)

def zip_main(args):
	header('* Packing Flashable Zip')

	unsigned = tempfile.mkstemp()[1]

	with zipfile.ZipFile(unsigned, 'w', compression=zipfile.ZIP_DEFLATED, allowZip64=False) as zipf:
		# META-INF
		# update-binary
		target = os.path.join('META-INF', 'com', 'google', 'android', 'update-binary')
		vprint('zip: ' + target)
		zipf.writestr(target, gen_update_binary())
		# updater-script
		source = os.path.join('scripts', 'flash_script.sh')
		target = os.path.join('META-INF', 'com', 'google', 'android', 'updater-script')
		zip_with_msg(zipf, source, target)

		# Binaries
		for lib_dir, zip_dir in [('armeabi-v7a', 'arm'), ('x86', 'x86')]:
			for binary in ['magiskinit', 'magiskboot']:
				source = os.path.join('native', 'out', lib_dir, binary)
				target = os.path.join(zip_dir, binary)
				zip_with_msg(zipf, source, target)

		# APK
		source = os.path.join(config['outdir'], 'app-release.apk' if args.release else 'app-debug.apk')
		target = os.path.join('common', 'magisk.apk')
		zip_with_msg(zipf, source, target)

		# Scripts
		# boot_patch.sh
		source = os.path.join('scripts', 'boot_patch.sh')
		target = os.path.join('common', 'boot_patch.sh')
		zip_with_msg(zipf, source, target)
		# util_functions.sh
		source = os.path.join('scripts', 'util_functions.sh')
		with open(source, 'r') as script:
			# Add version info util_functions.sh
			util_func = script.read().replace('#MAGISK_VERSION_STUB',
				'MAGISK_VER="{}"\nMAGISK_VER_CODE={}'.format(config['version'], config['versionCode']))
			target = os.path.join('common', 'util_functions.sh')
			vprint('zip: ' + source + ' -> ' + target)
			zipf.writestr(target, util_func)
		# addon.d.sh
		source = os.path.join('scripts', 'addon.d.sh')
		target = os.path.join('common', 'addon.d.sh')
		zip_with_msg(zipf, source, target)

		# Prebuilts
		for chromeos in ['futility', 'kernel_data_key.vbprivk', 'kernel.keyblock']:
			source = os.path.join('chromeos', chromeos)
			zip_with_msg(zipf, source, source)

		# End of zipping

	output = os.path.join(config['outdir'], 'Magisk-v{}.zip'.format(config['version']) if config['prettyName'] else 
		'magisk-release.zip' if args.release else 'magisk-debug.zip')
	sign_zip(unsigned, output, args.release)
	header('Output: ' + output)

def zip_uninstaller(args):
	header('* Packing Uninstaller Zip')

	unsigned = tempfile.mkstemp()[1]

	with zipfile.ZipFile(unsigned, 'w', compression=zipfile.ZIP_DEFLATED, allowZip64=False) as zipf:
		# META-INF
		# update-binary
		target = os.path.join('META-INF', 'com', 'google', 'android', 'update-binary')
		vprint('zip: ' + target)
		zipf.writestr(target, gen_update_binary())
		# updater-script
		source = os.path.join('scripts', 'magisk_uninstaller.sh')
		target = os.path.join('META-INF', 'com', 'google', 'android', 'updater-script')
		zip_with_msg(zipf, source, target)

		# Binaries
		for lib_dir, zip_dir in [('armeabi-v7a', 'arm'), ('x86', 'x86')]:
			for bin in ['magisk', 'magiskboot']:
				source = os.path.join('native', 'out', lib_dir, bin)
				target = os.path.join(zip_dir, bin)
				zip_with_msg(zipf, source, target)

		# Scripts
		# util_functions.sh
		source = os.path.join('scripts', 'util_functions.sh')
		with open(source, 'r') as script:
			# Remove the stub
			target = os.path.join('util_functions.sh')
			vprint('zip: ' + source + ' -> ' + target)
			zipf.writestr(target, script.read())

		# Prebuilts
		for chromeos in ['futility', 'kernel_data_key.vbprivk', 'kernel.keyblock']:
			source = os.path.join('chromeos', chromeos)
			zip_with_msg(zipf, source, source)

		# End of zipping

	output = os.path.join(config['outdir'], 'Magisk-uninstaller-{}.zip'.format(datetime.datetime.now().strftime('%Y%m%d')) 
		if config['prettyName'] else 'magisk-uninstaller.zip')
	sign_zip(unsigned, output, args.release)
	header('Output: ' + output)

def cleanup(args):
	support_targets = {'native', 'java'}
	if len(args.target) == 0:
		# If nothing specified, clean everything
		args.target = support_targets
	else:
		args.target = set(args.target) & support_targets

	if 'native' in args.target:
		header('* Cleaning native')
		system(ndk_build + ' -C native B_MAGISK=1 B_INIT=1 B_BOOT=1 B_BXZ=1 B_BB=1 clean')
		shutil.rmtree(os.path.join('native', 'out'), ignore_errors=True)

	if 'java' in args.target:
		header('* Cleaning java')
		execv([gradlew, 'app:clean', 'snet:clean', 'utils:clean'])

def build_all(args):
	vars(args)['target'] = []
	build_stub(args)
	build_apk(args)
	build_binary(args)
	zip_main(args)
	zip_uninstaller(args)
	build_snet(args)

with open('config.prop', 'r') as f:
	for line in [l.strip(' \t\r\n') for l in f]:
		if line.startswith('#') or len(line) == 0:
			continue
		prop = line.split('=')
		config[prop[0].strip(' \t\r\n')] = prop[1].strip(' \t\r\n')

if 'version' not in config or 'versionCode' not in config:
	error('"version" and "versionCode" is required in "config.prop"')

try:
	config['versionCode'] = int(config['versionCode'])
except ValueError:
	error('"versionCode" is required to be an integer')

if 'prettyName' not in config:
	config['prettyName'] = 'false'

config['prettyName'] = config['prettyName'].lower() == 'true'

if 'outdir' not in config:
	config['outdir'] = 'out'

mkdir_p(config['outdir'])

parser = argparse.ArgumentParser(description='Magisk build script')
parser.add_argument('-r', '--release', action='store_true', help='compile Magisk for release')
parser.add_argument('-v', '--verbose', action='store_true', help='verbose output')
subparsers = parser.add_subparsers(title='actions')

all_parser = subparsers.add_parser('all', help='build everything (binaries/apks/zips)')
all_parser.set_defaults(func=build_all)

binary_parser = subparsers.add_parser('binary', help='build binaries')
binary_parser.add_argument('target', nargs='*', help='Support: magisk, magiskinit, magiskboot, busybox, b64xz. Leave empty to build all.')
binary_parser.set_defaults(func=build_binary)

apk_parser = subparsers.add_parser('apk', help='build Magisk Manager APK')
apk_parser.set_defaults(func=build_apk)

stub_parser = subparsers.add_parser('stub', help='build stub Magisk Manager APK')
stub_parser.set_defaults(func=build_stub)

snet_parser = subparsers.add_parser('snet', help='build snet extention for Magisk Manager')
snet_parser.set_defaults(func=build_snet)

zip_parser = subparsers.add_parser('zip', help='zip Magisk into a flashable zip')
zip_parser.set_defaults(func=zip_main)

un_parser = subparsers.add_parser('uninstaller', help='create flashable uninstaller')
un_parser.set_defaults(func=zip_uninstaller)

clean_parser = subparsers.add_parser('clean', help='cleanup.')
clean_parser.add_argument('target', nargs='*', help='Support: native, java. Leave empty to clean all.')
clean_parser.set_defaults(func=cleanup)

if len(sys.argv) == 1:
	parser.print_help()
	sys.exit(1)

args = parser.parse_args()
if args.release and not os.path.exists(keystore):
	error('Please generate a java keystore and place it in \'{}\''.format(keystore))
STDOUT = None if args.verbose else subprocess.DEVNULL
args.func(args)