from __future__ import print_function
import os
import os.path
import sys
import subprocess
import platform

SUPPORTED_PYTHON_PLATFORMS = ['Windows', 'Linux', 'Darwin']

# The values here must correspond with those in ../docker/prebuild.sh
BUILD_TARGETS = [
    {
        'arch': 'arm',
        'goarch': 'arm',
        'jni_dir': 'armeabi',
        'cc': 'armv7a-linux-androideabi16-clang',
    },
    {
        'arch': 'arm64',
        'goarch': 'arm64',
        'jni_dir': 'arm64-v8a',
        'cc': 'aarch64-linux-android21-clang',
        'min_sdk': 21,
    },
    {
        'arch': 'x86',
        'goarch': '386',
        'jni_dir': 'x86',
        'cc': 'i686-linux-android16-clang',
    },
    {
        'arch': 'x86_64',
        'goarch': 'amd64',
        'jni_dir': 'x86_64',
        'cc': 'x86_64-linux-android21-clang',
        'min_sdk': 21,
    }
]

def fail(message, *args, **kwargs):
    print((message % args).format(**kwargs))
    sys.exit(1)


def get_min_sdk(project_dir):
    with open(os.path.join(project_dir, 'app', 'build.gradle')) as file_handle:
        for line in file_handle:
            tokens = list(filter(None, line.split()))
            if len(tokens) == 2 and tokens[0] == 'minSdkVersion':
                return int(tokens[1])

    fail('Failed to find minSdkVersion')


def get_ndk_home():
    if not os.environ.get('ANDROID_NDK_HOME', ''):
        fail('ANDROID_NDK_HOME environment variable not defined')
    return os.environ['ANDROID_NDK_HOME']


if platform.system() not in SUPPORTED_PYTHON_PLATFORMS:
    fail('Unsupported python platform %s. Supported platforms: %s', platform.system(),
         ', '.join(SUPPORTED_PYTHON_PLATFORMS))

module_dir = os.path.dirname(os.path.realpath(__file__))
project_dir = os.path.realpath(os.path.join(module_dir, '..'))
# Use seperate build dir so standalone ndk isn't deleted by `gradle clean`
build_dir = os.path.join(module_dir, 'gobuild')
go_build_dir = os.path.join(build_dir, 'go-packages')
syncthing_dir = os.path.join(module_dir, 'src', 'github.com', 'syncthing', 'syncthing')
min_sdk = get_min_sdk(project_dir)

# Make sure all tags are available for git describe
# https://github.com/syncthing/syncthing-android/issues/872
subprocess.check_call([
    'git',
    '-C',
    syncthing_dir,
    'fetch',
    '--tags'
])

for target in BUILD_TARGETS:
    target_min_sdk = str(target.get('min_sdk', min_sdk))

    print('Building syncthing for', target['arch'])

    environ = os.environ.copy()
    environ.update({
        'GO111MODULE': 'on',
        'CGO_ENABLED': '1',
    })

    cc = '/'.join([
        get_ndk_home(), "toolchains/llvm/prebuilt/linux-x86_64", "bin",
        target['cc']])
    subprocess.check_call(
        ['go', 'run', 'build.go', '-goos', 'android',
         '-goarch', target['goarch'], '-cc', cc,
         '-pkgdir', os.path.join(go_build_dir, target['goarch']),
         '-no-upgrade', 'build'],
        env=environ, cwd=syncthing_dir)

    # Copy compiled binary to jniLibs folder
    target_dir = os.path.join(project_dir, 'app', 'src', 'main', 'jniLibs', target['jni_dir'])
    if not os.path.isdir(target_dir):
        os.makedirs(target_dir)
    target_artifact = os.path.join(target_dir, 'libsyncthing.so')
    if os.path.exists(target_artifact):
        os.unlink(target_artifact)
    os.rename(os.path.join(syncthing_dir, 'syncthing'), target_artifact)

    print('Finished build for', target['arch'])

print('All builds finished')