#!/usr/bin/python -u
import os
import sys
import subprocess
import logging
import datetime
import shutil
import time
import tempfile

sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
from zulip_tools import DEPLOYMENTS_DIR, LOCK_DIR, TIMESTAMP_FORMAT, FAIL, WARNING, ENDC

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

if len(sys.argv) != 2:
    print FAIL + "Usage: %s <tarball>" % (sys.argv[0],) + ENDC
    sys.exit(1)

tarball_path = sys.argv[1]

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

start_time = time.time()
got_lock = False
while time.time() - start_time < 300:
    try:
        os.mkdir(LOCK_DIR)
        got_lock = True
        break
    except OSError:
        print WARNING + "Another deployment in progress; waiting for lock..." + ENDC
        time.sleep(10)

if not got_lock:
    print FAIL + "Deployment already in progress.  Please run\n" \
               + "  %s/current/scripts/upgrade-zulip %s\n" % (DEPLOYMENTS_DIR, tarball_path) \
               + "manually when the previous deployment finishes, or run\n" \
               + "  rmdir %s\n"  % (LOCK_DIR,) \
               + "if the previous deployment crashed." \
               + ENDC
    sys.exit(1)

timestamp = datetime.datetime.now().strftime(TIMESTAMP_FORMAT)
deploy_path = os.path.join(DEPLOYMENTS_DIR, timestamp)

logging.info("Unpacking the tarball")
extract_path = tempfile.mkdtemp()
subprocess.check_call(["tar", "-xf", tarball_path, "-C", extract_path])
subprocess.check_call(["mv", os.path.join(extract_path, "zulip-server"), deploy_path])
subprocess.check_call(["rmdir", extract_path])
os.chdir(deploy_path)

logging.info("Restarting server...")
subprocess.check_call(["./scripts/restart-server"])

logging.info("Deployment complete")
shutil.rmtree(LOCK_DIR)