#!/usr/bin/env python3

import gzip
import os
import subprocess
import sys
import tempfile


SCRIPT_DIR = os.path.abspath(os.path.dirname(__file__))

try:
    AOSP_DIR = os.environ['ANDROID_BUILD_TOP']
except KeyError:
    print('error: ANDROID_BUILD_TOP environment variable is not set.',
          file=sys.stderr)
    sys.exit(1)

BUILTIN_HEADERS_DIR = (
    os.path.join(AOSP_DIR, 'bionic', 'libc', 'include'),
    os.path.join(AOSP_DIR, 'external', 'libcxx', 'include'),
    os.path.join(AOSP_DIR, 'prebuilts', 'sdk', 'renderscript', 'clang-include'),
)

EXPORTED_HEADERS_DIR = (
    os.path.join(AOSP_DIR, 'development', 'vndk', 'tools', 'header-checker',
                 'tests'),
)

SO_EXT = '.so'
SOURCE_ABI_DUMP_EXT_END = '.lsdump'
SOURCE_ABI_DUMP_EXT = SO_EXT + SOURCE_ABI_DUMP_EXT_END
COMPRESSED_SOURCE_ABI_DUMP_EXT = SOURCE_ABI_DUMP_EXT + '.gz'
VENDOR_SUFFIX = '.vendor'

DEFAULT_CPPFLAGS = ['-x', 'c++', '-std=c++11']
DEFAULT_CFLAGS = ['-std=gnu99']
DEFAULT_FORMAT = 'ProtobufTextFormat'

TARGET_ARCHS = ['arm', 'arm64', 'x86', 'x86_64', 'mips', 'mips64']


def get_reference_dump_dir(reference_dump_dir_stem,
                           reference_dump_dir_insertion, lib_arch):
    reference_dump_dir = os.path.join(reference_dump_dir_stem, lib_arch)
    reference_dump_dir = os.path.join(reference_dump_dir,
                                      reference_dump_dir_insertion)
    return reference_dump_dir


def copy_reference_dumps(lib_paths, reference_dir_stem,
                         reference_dump_dir_insertion, lib_arch, compress):
    reference_dump_dir = get_reference_dump_dir(reference_dir_stem,
                                                reference_dump_dir_insertion,
                                                lib_arch)
    num_created = 0
    for lib_path in lib_paths:
        copy_reference_dump(lib_path, reference_dump_dir, compress)
        num_created += 1
    return num_created


def copy_reference_dump(lib_path, reference_dump_dir, compress):
    reference_dump_path = os.path.join(
        reference_dump_dir, os.path.basename(lib_path))
    if compress:
        reference_dump_path += '.gz'
    os.makedirs(os.path.dirname(reference_dump_path), exist_ok=True)
    output_content = read_output_content(lib_path, AOSP_DIR)
    if compress:
        with gzip.open(reference_dump_path, 'wb') as f:
            f.write(bytes(output_content, 'utf-8'))
    else:
        with open(reference_dump_path, 'wb') as f:
            f.write(bytes(output_content, 'utf-8'))
    print('Created abi dump at', reference_dump_path)
    return reference_dump_path


def copy_reference_dump_content(lib_name, output_content,
                                reference_dump_dir_stem,
                                reference_dump_dir_insertion, lib_arch):
    reference_dump_dir = get_reference_dump_dir(reference_dump_dir_stem,
                                                reference_dump_dir_insertion,
                                                lib_arch)
    reference_dump_path = os.path.join(reference_dump_dir,
                                       lib_name + SOURCE_ABI_DUMP_EXT)
    os.makedirs(os.path.dirname(reference_dump_path), exist_ok=True)
    with open(reference_dump_path, 'w') as f:
        f.write(output_content)

    print('Created abi dump at', reference_dump_path)
    return reference_dump_path


def read_output_content(output_path, replace_str):
    with open(output_path, 'r') as f:
        return f.read().replace(replace_str, '')


def run_header_abi_dumper(input_path, remove_absolute_paths, cflags=tuple(),
                          export_include_dirs=EXPORTED_HEADERS_DIR):
    with tempfile.TemporaryDirectory() as tmp:
        output_path = os.path.join(tmp, os.path.basename(input_path)) + '.dump'
        run_header_abi_dumper_on_file(input_path, output_path,
                                      export_include_dirs, cflags)
        if remove_absolute_paths:
            return read_output_content(output_path, AOSP_DIR)
        with open(output_path, 'r') as f:
            return f.read()


def run_header_abi_dumper_on_file(input_path, output_path,
                                  export_include_dirs=tuple(), cflags=tuple(),
                                  flags=tuple()):
    input_ext = os.path.splitext(input_path)[1]
    cmd = ['header-abi-dumper', '-o', output_path, input_path,]
    for dir in export_include_dirs:
        cmd += ['-I', dir]
    cmd += flags
    if '-output-format' not in flags:
        cmd += ['-output-format', DEFAULT_FORMAT]
    cmd += ['--']
    cmd += cflags
    if input_ext in ('.cpp', '.cc', '.h'):
        cmd += DEFAULT_CPPFLAGS
    else:
        cmd += DEFAULT_CFLAGS

    for dir in BUILTIN_HEADERS_DIR:
        cmd += ['-isystem', dir]
    # The export include dirs imply local include dirs.
    for dir in export_include_dirs:
        cmd += ['-I', dir]
    subprocess.check_call(cmd)


def run_header_abi_linker(output_path, inputs, version_script, api, arch,
                          flags=tuple()):
    """Link inputs, taking version_script into account"""
    cmd = ['header-abi-linker', '-o', output_path, '-v', version_script,
           '-api', api, '-arch', arch]
    cmd += flags
    if '-input-format' not in flags:
        cmd += ['-input-format', DEFAULT_FORMAT]
    if '-output-format' not in flags:
        cmd += ['-output-format', DEFAULT_FORMAT]
    cmd += inputs
    subprocess.check_call(cmd)
    return read_output_content(output_path, AOSP_DIR)


def make_tree(product):
    # To aid creation of reference dumps.
    make_cmd = ['build/soong/soong_ui.bash', '--make-mode', '-j',
                'vndk', 'findlsdumps', 'TARGET_PRODUCT=' + product]
    subprocess.check_call(make_cmd, cwd=AOSP_DIR)


def make_targets(targets, product):
    make_cmd = ['build/soong/soong_ui.bash', '--make-mode', '-j']
    for target in targets:
        make_cmd.append(target)
    make_cmd.append('TARGET_PRODUCT=' + product)
    subprocess.check_call(make_cmd, cwd=AOSP_DIR, stdout=subprocess.DEVNULL,
                          stderr=subprocess.STDOUT)


def make_libraries(libs, product, llndk_mode):
    # To aid creation of reference dumps. Makes lib.vendor for the current
    # configuration.
    lib_targets = []
    for lib in libs:
        lib = lib if llndk_mode else lib + VENDOR_SUFFIX
        lib_targets.append(lib)
    make_targets(lib_targets, product)


def find_lib_lsdumps(target_arch, target_arch_variant,
                     target_cpu_variant, lsdump_paths,
                     core_or_vendor_shared_str, libs):
    """ Find the lsdump corresponding to lib_name for the given arch parameters
        if it exists"""
    assert 'ANDROID_PRODUCT_OUT' in os.environ
    cpu_variant = '_' + target_cpu_variant
    arch_variant = '_' + target_arch_variant
    arch_lsdump_paths = []
    if target_cpu_variant == 'generic' or target_cpu_variant is None or\
        target_cpu_variant == '':
        cpu_variant = ''
    if target_arch_variant == target_arch or target_arch_variant is None or\
        target_arch_variant == '':
        arch_variant = ''

    target_dir = 'android_' + target_arch + arch_variant +\
        cpu_variant + core_or_vendor_shared_str
    for key in lsdump_paths:
        if libs and key not in libs:
            continue
        for path in lsdump_paths[key]:
            if target_dir in path:
                arch_lsdump_paths.append(os.path.join(AOSP_DIR, path.strip()))
    return arch_lsdump_paths


def run_abi_diff(old_test_dump_path, new_test_dump_path, arch, lib_name,
                 flags=tuple()):
    abi_diff_cmd = ['header-abi-diff', '-new', new_test_dump_path, '-old',
                    old_test_dump_path, '-arch', arch, '-lib', lib_name]
    with tempfile.TemporaryDirectory() as tmp:
        output_name = os.path.join(tmp, lib_name) + '.abidiff'
        abi_diff_cmd += ['-o', output_name]
        abi_diff_cmd += flags
        if '-input-format-old' not in flags:
            abi_diff_cmd += ['-input-format-old', DEFAULT_FORMAT]
        if '-input-format-new' not in flags:
            abi_diff_cmd += ['-input-format-new', DEFAULT_FORMAT]
        try:
            subprocess.check_call(abi_diff_cmd)
        except subprocess.CalledProcessError as err:
            return err.returncode

    return 0


def get_build_vars_for_product(names, product=None):
    """ Get build system variable for the launched target."""

    if product is None and 'ANDROID_PRODUCT_OUT' not in os.environ:
        return None

    cmd = ''
    if product is not None:
        cmd += 'source build/envsetup.sh > /dev/null && '
        cmd += 'lunch ' + product + ' > /dev/null && '
    cmd += 'build/soong/soong_ui.bash --dumpvars-mode -vars \"'
    cmd += ' '.join(names)
    cmd += '\"'

    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                            stderr=subprocess.DEVNULL, cwd=AOSP_DIR, shell=True)
    out, _ = proc.communicate()

    build_vars = out.decode('utf-8').strip().splitlines()

    build_vars_list = []
    for build_var in build_vars:
        value = build_var.partition('=')[2]
        build_vars_list.append(value.replace('\'', ''))
    return build_vars_list