#!/usr/bin/env sh

# Shell commands follow
# Next line is bilingual: it starts a comment in Python, but do nothing in shell
""":"

# Find a suitable python interpreter
for cmd in python3 python; do
    command -v > /dev/null $cmd && exec `command -v $cmd` $0 "$@"
done

echo "Python interpreter is not found in this system, please, install python or contact DEVTOOLSSUPPORT" >2

exit 2

":"""
# Previous line is bilingual: it ends a comment in Python, but do nothing in shell
# Shell commands end here
# Python script follows

import os
import sys
import platform
import json

URLS = ['https://proxy.sandbox.yandex-team.ru/4910542326', 'https://storage.yandex-team.ru/get-devtools/1942671/64e25bd1bfaf98ac60ca046793bd2100/by_platform.json']
MD5 = '64e25bd1bfaf98ac60ca046793bd2100'

URLS3 = ['https://proxy.sandbox.yandex-team.ru/4910548121', 'https://storage.yandex-team.ru/get-devtools/1809005/bb466a0bd1bc53f76e2db2ef0dbbac06/by_platform.json']
MD53 = 'bb466a0bd1bc53f76e2db2ef0dbbac06'

DEFAULT_PY_VER = 2

RETRIES = 5
HASH_PREFIX = 10

PY3_HANDLERS = {
    "ya3bin0", "ya3bin3",  # handers for tests
    "krevedko",
    "curl", "nvim", "gdb", "emacs", "grep", "jstyle", "nile", "sed", "vim",
    "py23_utils",
    'ydb',
    'upload', 'download', 'paste', 'whoami',
}

PY2_HANDLERS = {
    "ya2bin0", "ya2bin2",
}

EXPERIMENTAL_PY3_HANDLERS = set()

DEVTOOLS_PY3_HANDLERS = set()


def is_devtools():
    # type: () -> bool
    devtools_users = {'tldr', 'yetty', 'prettyboy', 'neksard', 'ival83', 'mikhnenko', 'aokhotin', 'somov', 'shadchin', 'albazh', 'grasscat', 'nogert', 'jolex007', 'aakuz', 'aripinen', 'sudilovskiy', 'tutelka', 'tutelka', 'vlasovskikh', 'vlasovskikh', 'and42', 'say', 'rudeshko', 'pg', 'artanis', 'hiddenpath', 'hiddenpath', 'khoden', 'bulatkhr', 'v-korovin', 'viknet', 'saxumcordis', 'vpozdyayev', 'vturov', 'vturov', 'vlad-savinov', 'slava', 'miripiruni', 'trushkin', 'griddic', 'ligreen', 'zaverden', 'kirpadmitriy', 'dmitko', 'dldmitry', 'lix0', 'yak-dmitriy', 'dankolesnikov', 'keepitsimple', 'workfork', 'vania-pooh', 'ilezhankin', 'igorart', 'thevery', 'ilia-vashurov', 'iaz1607', 'il2kondr4', 'ilyasiluyanov', 'trofimenkov', 'kirkharitonov', 'korum', 'tilacyn', 'maratik', 'miroslav2', 'spasitel', 'nslus', 'nsamokhin', 'r2d2', 'zhukoff-pavel', 'r-vetrov', 'gotocoding', 'svkov42', 'sabevzenko', 'belesev', 'svidyuk', 'snermolaev', 'spreis', 's-repalov', 'golovin-stan', 'ilikepugs', 'tekireeva', 'zumra6a', 'sareyu', 'thegeorg', 'snowball'}

    user = os.environ.get('USER')
    return bool(user and user in devtools_users)


def create_dirs(path):
    try:
        os.makedirs(path)
    except OSError as e:
        import errno

        if e.errno != errno.EEXIST:
            raise

    return path


def home_dir():
    # Do not trust $HOME, as it is unreliable in certain environments
    # Temporarily delete os.environ["HOME"] to force reading current home directory from /etc/passwd
    home_from_env = os.environ.pop("HOME", None)
    try:
        home_from_passwd = os.path.expanduser("~")
        if os.path.isabs(home_from_passwd):
            # This home dir is valid, prefer it over $HOME
            return home_from_passwd
        else:
            # When python is built with musl (this is quire weird though),
            # only users from /etc/passwd will be properly resolved,
            # as musl does not have nss module for LDAP integration.
            return home_from_env

    finally:
        if home_from_env is not None:
            os.environ["HOME"] = home_from_env


def misc_root():
    return create_dirs(os.getenv('YA_CACHE_DIR') or os.path.join(home_dir(), '.ya'))


def tool_root():
    return create_dirs(os.getenv('YA_CACHE_DIR_TOOLS') or os.path.join(misc_root(), 'tools'))


def ya_token():
    def get_token_from_file():
        try:
            with open(os.environ.get('YA_TOKEN_PATH', os.path.join(home_dir(), '.ya_token')), 'r') as f:
                return f.read().strip()
        except:
            pass
    return os.getenv('YA_TOKEN') or get_token_from_file()


TOOLS_DIR = tool_root()


def uniq(size=6):
    import string
    import random

    return ''.join(random.choice(string.ascii_lowercase + string.digits) for _ in range(size))


_ssl_is_tuned = False


def _tune_ssl():
    global _ssl_is_tuned
    if _ssl_is_tuned:
        return
    try:
        import ssl
        ssl._create_default_https_context = ssl._create_unverified_context
    except AttributeError:
        pass

    try:
        import urllib3
        urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
    except (AttributeError, ImportError):
        pass
    _ssl_is_tuned = True


def _fetch(url, into):
    import hashlib
    _tune_ssl()

    try:
        from urllib2 import urlopen
        from urllib2 import Request
        from urlparse import urlparse
    except ImportError:
        from urllib.request import urlopen
        from urllib.request import Request
        from urllib.parse import urlparse

    request = Request(str(url))
    request.add_header('User-Agent', 'ya-bootstrap')
    if urlparse(url).netloc == 'proxy.sandbox.yandex-team.ru':
        token = ya_token()
        if token:
            request.add_header('Authorization', 'OAuth {}'.format(token))

    md5 = hashlib.md5()
    sys.stderr.write('Downloading %s ' % url)
    sys.stderr.flush()
    conn = urlopen(request, timeout=10)
    sys.stderr.write('[')
    sys.stderr.flush()
    try:
        with open(into, 'wb') as f:
            while True:
                block = conn.read(1024 * 1024)
                sys.stderr.write('.')
                sys.stderr.flush()
                if block:
                    md5.update(block)
                    f.write(block)
                else:
                    break
        return md5.hexdigest()

    finally:
        sys.stderr.write('] ')
        sys.stderr.flush()


def _atomic_fetch(url, into, md5):
    tmp_dest = into + '.' + uniq()
    try:
        real_md5 = _fetch(url, tmp_dest)
        if real_md5 != md5:
            raise Exception('MD5 mismatched: %s differs from %s' % (real_md5, md5))
        os.rename(tmp_dest, into)
        sys.stderr.write('OK\n')
    except Exception as e:
        sys.stderr.write('ERROR: ' + str(e) + '\n')
        raise
    finally:
        try:
            os.remove(tmp_dest)
        except OSError:
            pass


def _extract(path, into):
    import tarfile

    tar = tarfile.open(path, errorlevel=2)

    # tar.extractall() will try to set file ownership according to the attributes stored in the archive
    # by calling TarFile.chown() method.
    # As this information is hardly relevant to the point of deployment / extraction,
    # it will just fail (python2) if ya is executed with root euid, or silently set non-existent numeric owner (python3)
    # to the files being extracted.
    # mock it with noop to retain current user ownership.
    tar.chown = lambda *args, **kwargs: None

    tar.extractall(path=into)
    tar.close()


def _get(urls, md5):
    dest_path = os.path.join(TOOLS_DIR, md5[:HASH_PREFIX])

    if not os.path.exists(dest_path):
        for iter in range(RETRIES):
            try:
                _atomic_fetch(urls[iter % len(urls)], dest_path, md5)
                break
            except Exception:
                if iter + 1 == RETRIES:
                    raise
                else:
                    import time
                    time.sleep(iter)

    return dest_path


def _get_dir(urls, md5, ya_name):
    dest_dir = os.path.join(TOOLS_DIR, md5[:HASH_PREFIX] + '_d')

    if os.path.isfile(os.path.join(dest_dir, ya_name)):
        return dest_dir

    try:
        packed_path = _get(urls, md5)
    except Exception:
        if os.path.isfile(os.path.join(dest_dir, ya_name)):
            return dest_dir
        raise

    tmp_dir = dest_dir + '.' + uniq()
    try:
        try:
            _extract(packed_path, tmp_dir)
        except Exception:
            if os.path.isfile(os.path.join(dest_dir, ya_name)):
                return dest_dir
            raise

        try:
            os.rename(tmp_dir, dest_dir)
        except OSError as e:
            import errno
            if e.errno != errno.ENOTEMPTY:
                raise

        return dest_dir
    finally:
        import shutil
        shutil.rmtree(tmp_dir, ignore_errors=True)
        try:
            os.remove(packed_path)
        except Exception:
            pass


def _mine_arc_root():
    return os.path.dirname(os.path.realpath(__file__))


def _parse_arguments():
    use_python = None
    use_python_set_force = False
    print_sandbox_id = False
    result_args = list(sys.argv[1:])
    handler = None

    if len(sys.argv) > 1:
        for index, arg in enumerate(sys.argv[1:]):
            if arg == "-3" or arg == "-2":
                if arg == "-3":
                    new_value = 3
                elif arg == "-2":
                    new_value = 2
                else:
                    raise NotImplementedError("Unknown argument: {}".format(arg))

                if use_python is not None and use_python != new_value:
                    sys.stderr.write("You can use only python2 (-2) OR python3 (-3) -based ya-bin, not both\n")
                    exit(2)

                use_python = new_value
                use_python_set_force = True
            elif arg.startswith("--print-sandbox-id="):
                if print_sandbox_id:
                    sys.stderr.write("You can print only one sandbox id at a time")
                    exit(2)

                print_sandbox_id = arg.split('=')[1]
            else:
                # Do not try to parse remaining part of command
                result_args = result_args[index:]
                break

        # All ya script specific arguments found, search for handler

        skippable_flags = ('--error-file',)
        skip_next = False
        for arg in result_args:
            if not arg.startswith("-") and not skip_next:
                handler = arg
                break

            skip_next = arg in skippable_flags

    ENV_TRUE = ('yes', '1')

    py3_handlers_disabled = os.environ.get('YA_DISABLE_PY3_HANDLERS') in ENV_TRUE

    if py3_handlers_disabled:
        use_python = 2
        use_python_set_force = True  # Prevent ya-bin respawn
    elif use_python == 3:
        if not print_sandbox_id:
            # will be shown only if user set `-3` by force
            sys.stderr.write("!! python3-based ya-bin will be used, "
                             "be prepared for some strange effects, "
                             "don't be ashamed to write in DEVTOOLSSUPPORT about it\n")
        pass
    elif use_python == 2:
        pass
    elif handler in PY2_HANDLERS:
        use_python = 2
    elif handler in PY3_HANDLERS:
        use_python = 3
    else:
        use_python = 23  # ya-bin/3 makes a decision

    if not use_python_set_force and not py3_handlers_disabled and use_python != 3:
        # User didn't set python version by force, didn't disable it, handler is under python2, so lets check experiments

        ya_experimental = os.environ.get("YA_EXPERIMENTAL") in ENV_TRUE
        if ya_experimental and handler in EXPERIMENTAL_PY3_HANDLERS:
            sys.stderr.write("!! python3-based ya-bin will be used because of:\n"
                            " * You enable `YA_EXPERIMENTAL` environment variable\n"
                            " * Handler `{}` in the list of experimental python3-compatible handlers\n"
                            "".format(handler))
            use_python = 3
        elif is_devtools() and handler in DEVTOOLS_PY3_HANDLERS:
            sys.stderr.write("!! python3-based ya-bin will be used because of:\n"
                                " * You are member of DEVTOOLS (it's just list of logins in `ya` script)\n"
                                " * Handler `{}` in the list of experimental python3-compatible handlers for DEVTOOLS members\n"
                                "".format(handler) )
            use_python = 3

    if use_python == 2:
        urls, md5 = URLS, MD5
    elif use_python == 3:
        urls, md5 = URLS3, MD53
    elif use_python == 23:
        if DEFAULT_PY_VER == 2:
            urls, md5 = URLS, MD5
        elif DEFAULT_PY_VER == 3:
            urls, md5 = URLS3, MD53
        else:
            raise NotImplementedError("Unknown default python version: {}".format(DEFAULT_PY_VER))
    else:
        raise NotImplementedError("Unknown python version: {}".format(use_python))
    return md5, print_sandbox_id, result_args, urls, use_python, use_python_set_force


def main():
    if not os.path.exists(TOOLS_DIR):
        os.makedirs(TOOLS_DIR)

    md5, print_sandbox_id, result_args, urls, use_python, use_python_set_force = _parse_arguments()

    with open(_get(urls, md5), 'r') as fp:
        meta = json.load(fp)['data']
    my_platform = platform.system().lower()
    my_machine = platform.machine().lower()
    if my_platform == 'linux':
        if 'ppc64le' in platform.platform():
            my_platform = 'linux-ppc64le'
        elif 'aarch64' in platform.platform():
            my_platform = 'linux-aarch64'
        else:
            my_platform = 'linux_musl'
    if my_platform == 'darwin' and my_machine == 'arm64':
        my_platform = 'darwin-arm64'

    def _platform_key(target_platform):
        """ match by max prefix length, prefer shortest """
        def _key_for_platform(platform):
            return len(os.path.commonprefix([target_platform, platform])), -len(platform)

        return _key_for_platform

    best_key = max(meta.keys(), key=_platform_key(my_platform))
    value = meta[best_key]

    if print_sandbox_id:
        target = print_sandbox_id
        best_target = max(meta.keys(), key=_platform_key(target))
        sys.stdout.write(str(meta[best_target]['resource_id']) + '\n')
        exit(0)

    ya_name = {'win32': 'ya-bin.exe', 'win32-clang-cl': 'ya-bin.exe'}.get(best_key, 'ya-bin')  # XXX
    ya_dir = _get_dir(value['urls'], value['md5'], ya_name)

    # Popen `args` must have `str` type
    ya_path = str(os.path.join(ya_dir, ya_name))

    env = os.environ.copy()
    if 'YA_SOURCE_ROOT' not in env:
        src_root = _mine_arc_root()
        if src_root is not None:
            env['YA_SOURCE_ROOT'] = src_root

    # For more info see YT-14105
    for env_name in [
        'LD_PRELOAD',
        'Y_PYTHON_SOURCE_ROOT',
    ]:
        if env_name in os.environ:
            sys.stderr.write("Warn: {}='{}' is specified and may affect the correct operation of the ya\n".format(env_name, env[env_name]))

    env['YA_PYVER_REQUIRE'] = str(use_python)
    if use_python_set_force:
        env['YA_PYVER_SET_FORCED'] = 'yes'

    if os.name == 'nt':
        import subprocess

        p = subprocess.Popen([ya_path] + result_args, env=env)
        p.wait()
        sys.exit(p.returncode)
    else:
        os.execve(ya_path, [ya_path] + result_args, env)


if __name__ == '__main__':
    try:
        main()
    except Exception as e:
        sys.stderr.write('ERROR: ' + str(e) + '\n')
        from traceback import format_exc
        sys.stderr.write(format_exc() + "\n")
        sys.exit(1)