#!/usr/bin/env python
from __future__ import print_function
import os
from six.moves import configparser # type: ignore # https://github.com/python/typeshed/issues/307
import sys
import subprocess
import logging

config_file = configparser.RawConfigParser()
config_file.read("/etc/zulip/zulip.conf")
LOCAL_GIT_CACHE_DIR = '/srv/zulip.git'

ZULIP_COM = config_file.get('machine', 'deploy_type') in ['zulip.com-prod',
                                                          'zulip.com-staging']
try:
    git_url = config_file.get('deployment', 'git_repo_url')
except (configparser.NoSectionError, configparser.NoOptionError):
    git_url = "https://github.com/zulip/zulip.git"
try:
    deploy_options = config_file.get('deployment', 'deploy_options').strip().split()
except (configparser.NoSectionError, configparser.NoOptionError):
    deploy_options = []

os.environ["PYTHONUNBUFFERED"] = "y"

sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
from zulip_tools import DEPLOYMENTS_DIR, FAIL, WARNING, ENDC, make_deploy_path, \
    get_deployment_lock, release_deployment_lock, su_to_zulip

logging.basicConfig(format="%(asctime)s update-deployment: %(message)s",
                    level=logging.INFO)

if len(sys.argv) != 2:
    print(FAIL + "Usage: update-deployment refname" + ENDC)
    sys.exit(1)

refname = sys.argv[1]

subprocess.check_call(["mkdir", '-p',
                       DEPLOYMENTS_DIR,
                       '/home/zulip/logs'])

error_rerun_script = "%s/current/tools/update-deployment %s" % (DEPLOYMENTS_DIR, refname)
get_deployment_lock(error_rerun_script)

try:
    deploy_path = make_deploy_path()
    if not os.path.exists(LOCAL_GIT_CACHE_DIR):
        os.chdir('/srv/')
        logging.info("Cloning the repository")
        subprocess.check_call(["git", "clone", "-q", git_url, "--mirror", LOCAL_GIT_CACHE_DIR],
                              stdout=open('/dev/null', 'w'))
        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", "fetch", "-q"], 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)

    if ZULIP_COM:
        # Install the zulip.com settings (local_settings.py) as prod_settings.py
        subprocess.check_call(["ln", "-nsf", os.path.join(deploy_path, "zproject/local_settings.py"),
                               os.path.join(deploy_path, "zproject/prod_settings.py")])
    else:
        # Install the prod_settings.py symlink
        subprocess.check_call(["ln", "-nsf", "/etc/zulip/settings.py",
                               os.path.join(deploy_path, "zproject/prod_settings.py")])

    # Hack to deploy images not included in open source project
    if os.path.exists("/etc/zulip/zulip-dropbox.png"):
        subprocess.check_call(["cp", "-a", "/etc/zulip/zulip-dropbox.png",
                               os.path.join(deploy_path, "static/images/logo")])

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

    logging.info("Deployment complete")
    subprocess.check_call(["./scripts/purge-old-deployments"])
finally:
    release_deployment_lock()