#!/usr/bin/env python3
import os
import sys
import subprocess
import logging
import time
import argparse

LOCAL_GIT_CACHE_DIR = '/srv/zulip.git'
os.environ["PYTHONUNBUFFERED"] = "y"

sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..'))
from scripts.lib.zulip_tools import DEPLOYMENTS_DIR, make_deploy_path, \
    get_deployment_lock, overwrite_symlink, release_deployment_lock, su_to_zulip, assert_running_as_root, \
    get_config_file, get_deploy_options, get_config

config_file = get_config_file()
deploy_options = get_deploy_options(config_file)
remote_url = get_config(config_file, 'deployment', 'git_repo_url', "https://github.com/zulip/zulip.git")

assert_running_as_root(strip_lib_from_paths=True)

# make sure we have appropriate file permissions
os.umask(0o22)

logging.Formatter.converter = time.gmtime
logging.basicConfig(format="%(asctime)s upgrade-zulip-from-git: %(message)s",
                    level=logging.INFO)

parser = argparse.ArgumentParser()
parser.add_argument("refname", help="Git reference, e.g. a branch, tag, or commit ID.")
parser.add_argument("--remote-url", dest="remote_url",
                    help="Override the Git remote URL configured in /etc/zulip/zulip.conf.")
args = parser.parse_args()

refname = args.refname
# Command line remote URL will be given preference above the one
# in /etc/zulip/zulip.conf.
if args.remote_url:
    remote_url = args.remote_url

os.makedirs(DEPLOYMENTS_DIR, exist_ok=True)
os.makedirs('/home/zulip/logs', exist_ok=True)

error_rerun_script = f"{DEPLOYMENTS_DIR}/current/scripts/upgrade-zulip-from-git {refname}"
get_deployment_lock(error_rerun_script)

try:
    deploy_path = make_deploy_path()
    if not os.path.exists(LOCAL_GIT_CACHE_DIR):
        logging.info("Cloning the repository")
        subprocess.check_call(["git", "clone", "-q", remote_url, "--mirror", LOCAL_GIT_CACHE_DIR],
                              stdout=open('/dev/null', 'w'))
    if os.stat(LOCAL_GIT_CACHE_DIR).st_uid == 0:
        subprocess.check_call(["chown", "-R", "zulip:zulip", LOCAL_GIT_CACHE_DIR])

    logging.info("Fetching the latest commits")
    os.chdir(LOCAL_GIT_CACHE_DIR)
    subprocess.check_call(["git", "remote", "set-url", "origin", remote_url], preexec_fn=su_to_zulip)
    subprocess.check_call(["git", "fetch", "-q", "--tags"], preexec_fn=su_to_zulip)

    subprocess.check_call(["git", "clone", "-q", "-b", refname, LOCAL_GIT_CACHE_DIR, deploy_path],
                          stdout=open('/dev/null', 'w'),
                          preexec_fn=su_to_zulip)
    os.chdir(deploy_path)

    overwrite_symlink("/etc/zulip/settings.py", "zproject/prod_settings.py")

    overwrite_symlink(deploy_path, os.path.join(DEPLOYMENTS_DIR, "next"))

    subprocess.check_call([os.path.join(deploy_path, "scripts", "lib", "upgrade-zulip-stage-2"),
                           deploy_path, "--from-git"] + deploy_options)
finally:
    release_deployment_lock()