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

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 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'])

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/update-deployment %s\n" % (DEPLOYMENTS_DIR, refname) \
               + "manually when the current deployment finishes." + ENDC
    sys.exit(1)

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

logging.info("Cloning the repository")
subprocess.check_call(["git", "clone", "-q", "-b", refname,
                       "git@git.zulip.net:eng/zulip.git",
                       deploy_path], stdout=open('/dev/null', 'w'))
os.chdir(deploy_path)

# Delete all .pyc files to avoid old module files hanging around
subprocess.check_call(["find", ".", "-name", "*.pyc", "-delete"], stdout=open('/dev/null', 'w'))

# Update static files
logging.info("Updating static files")
subprocess.check_call(["./scripts/update-prod-static", "--prev-deploy",
                      os.path.join(DEPLOYMENTS_DIR, 'current')])

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

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

subprocess.check_call(["./scripts/purge-deployments"])