#!/usr/bin/env python3
import os
import platform
import shlex
import subprocess
import sys
from typing import Callable, List

TOOLS_DIR = os.path.dirname(__file__)
ROOT_DIR = os.path.dirname(TOOLS_DIR)
sys.path.insert(0, ROOT_DIR)
from scripts.lib.zulip_tools import get_dev_uuid_var_path

UUID_VAR_PATH = get_dev_uuid_var_path()


def run(check_func: Callable[[], bool]) -> None:
    """
    This decorator simply runs functions.  It makes it more
    convenient to add new checks without a big main() function.
    """
    rc = check_func()
    if not rc:
        sys.exit(1)


def run_command(args: List[str]) -> None:
    print(shlex.join(args))
    subprocess.check_call(args)


@run
def check_python_version() -> bool:
    subprocess.check_call(["/usr/bin/env", "python", "-V"])
    return True


@run
def pwd() -> bool:
    print(os.getcwd())
    return True


@run
def host_info() -> bool:
    print(platform.platform())
    return True


@run
def check_django() -> bool:
    try:
        import django

        print("Django version:", django.get_version())
        return True
    except ImportError:
        print(
            """
            ERROR!
            We cannot import Django, which is usually a
            symptom of not having your Python venv
            set up correctly.

            Make sure your shell does this at init time:

            source /srv/zulip-py3-venv/bin/activate

            Or maybe you forget to run inside your VM?
            """
        )
        return False


@run
def provision_version() -> bool:
    fn = os.path.join(UUID_VAR_PATH, "provision_version")
    with open(fn) as f:
        version = tuple(map(int, f.read().strip().split(".")))
    print("latest version provisioned:", version)
    from version import PROVISION_VERSION

    print("desired version:", PROVISION_VERSION)
    if not (PROVISION_VERSION <= version < (PROVISION_VERSION[0] + 1,)):
        print("You need to provision!")
        return False
    return True


@run
def node_stuff() -> bool:
    print("node version:")
    subprocess.check_call(["node", "--version"])
    return True


@run
def test_models() -> bool:
    settings_module = "zproject.settings"
    os.environ["DJANGO_SETTINGS_MODULE"] = settings_module
    import django

    django.setup()
    from zerver.models import Realm, UserProfile

    print("Num realms: ", Realm.objects.count())
    print("Num users: ", UserProfile.objects.count())
    return True


@run
def check_venv() -> bool:
    path = os.path.join(ROOT_DIR, "scripts", "lib", "hash_reqs.py")
    cache_dir = "/srv/zulip-venv-cache/"
    for fn in ["dev.txt"]:
        requirements_file = os.path.join(ROOT_DIR, "requirements", fn)
        output = subprocess.check_output([path, requirements_file], text=True)
        sha1sum = output.split()[0]
        print(fn, "venv sha: ", sha1sum)
        if not os.path.exists(os.path.join(cache_dir, sha1sum)):
            print("Your venv may be improperly installed!")
            return False
    return True


@run
def check_migrations() -> bool:
    print()
    rc = subprocess.check_call("./tools/test-migrations")
    return rc == 0
