# Licensed to  ElasticSearch and Shay Banon under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the 'License'); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an 'AS IS' BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import re
import tempfile
import shutil
import os
import datetime
import json
import time
import sys
import argparse
import hmac
import urllib
from http.client import HTTPConnection

LOG = '/tmp/release.log'

def log(msg):
  f = open(LOG, mode='ab')
  f.write(msg.encode('utf-8'))
  f.close()

def run(command, quiet=False):
  log('\n\n%s: RUN: %s\n' % (datetime.datetime.now(), command))
  if os.system('%s >> %s 2>&1' % (command, LOG)):
    msg = '    FAILED: %s [see log %s]' % (command, LOG)
    if not quiet:
      print(msg)
    raise RuntimeError(msg)

env = os.environ
try:
  JAVA_HOME = env['JAVA_HOME']
except KeyError:
  raise RuntimeError("""
  Please set JAVA_HOME in the env before running release tool
  On OSX use: export JAVA_HOME=`/usr/libexec/java_home -v '1.6*'`""")

try:
  JAVA_HOME = env['JAVA6_HOME']
except KeyError:
  pass #no JAVA6_HOME - we rely on JAVA_HOME


try:
  MVN='mvn'
  # make sure mvn3 is used if mvn3 is available
  # some systems use maven 2 as default
  run('mvn3 --version', quiet=True)
  MVN='mvn3'
except RuntimeError:
  pass


def java_exe():
  path = JAVA_HOME
  return 'export JAVA_HOME="%s" PATH="%s/bin:$PATH" JAVACMD="%s/bin/java"' % (path, path, path)

def verify_java_version(version):
  s = os.popen('%s; java -version 2>&1' % java_exe()).read()
  if s.find(' version "%s.' % version) == -1:
    raise RuntimeError('got wrong version for java %s:\n%s' % (version, s))

def verify_mvn_java_version(version, mvn):
  s = os.popen('%s; %s --version 2>&1' % (java_exe(), mvn)).read()
  if s.find('Java version: %s' % version) == -1:
    raise RuntimeError('got wrong java version for %s %s:\n%s' % (mvn, version, s))

def get_head_hash():
  return os.popen('git rev-parse --verify HEAD 2>&1').read().strip()

def get_current_branch():
  return os.popen('git rev-parse --abbrev-ref HEAD  2>&1').read().strip()

verify_java_version('1.6') # we require to build with 1.6
verify_mvn_java_version('1.6', MVN)

def release_branch(release):
  return 'release_branch_%s' % (release)

def create_release_branch(remote, src_branch, release):
  run('git checkout %s' % (src_branch))
  run('git pull --rebase %s %s' % (remote, src_branch))
  run('git checkout -b %s' % (release_branch(release)))


def process_file(file_path, line_callback):
  fh, abs_path = tempfile.mkstemp()
  with open(abs_path,'w') as new_file:
    with open(file_path) as old_file:
      for line in old_file:
        new_file.write(line_callback(line))
      #close temp file
      new_file.close()
      os.close(fh)
      old_file.close()
      #Remove original file
      os.remove(file_path)
      #Move new file
      shutil.move(abs_path, file_path)
  

def remove_maven_snapshot(pom, release):
  pattern = '<version>%s-SNAPSHOT</version>' % (release)
  replacement = '<version>%s</version>' % (release)
  def callback(line):
    return line.replace(pattern, replacement)
  process_file(pom, callback)


def remove_version_snapshot(version_file, release):
  # 1.0.0.Beta1 -> 1_0_0_Beat1
  release = release.replace('.', '_')
  pattern = 'new Version(V_%s_ID, true' % (release)
  replacement = 'new Version(V_%s_ID, false' % (release)
  def callback(line):
    return line.replace(pattern, replacement)
  process_file(version_file, callback)

def add_pending_files(*files):
  for file in files:
    run('git add %s' % (file))

def commit_release(release):
  run('git commit -m "release [%s]"' % release)

def tag_release(release):
  run('git tag -a v%s -m "Tag release version %s"' % (release, release))

def run_mvn(*cmd):
  for c in cmd:
    run('%s; %s %s' % (java_exe(), MVN, c))
def build_release(run_tests=False, dry_run=True, cpus=1):
  target = 'deploy'
  if dry_run:
    target = 'package'
  if run_tests:
    run_mvn('clean',
            'test -Dtests.cpu=%s -Des.node.mode=local' % (cpus),
            'test -Dtests.cpu=%s -Des.node.mode=network' % (cpus))
  run_mvn('clean %s -DskipTests' %(target))


def wait_for_node_startup(host='127.0.0.1', port=9200,timeout=15):
  conn = HTTPConnection(host, port, timeout);
  for _ in range(timeout):
    try:
      time.sleep(1)
      conn.request('GET', '')
      res = conn.getresponse()
      if res.status == 200:
        return True
    except:
      pass #that is ok it might not be there yet

  return False

def find_release_version(src_branch):
  run('git checkout %s' % (src_branch))
  with open('pom.xml') as file:
    for line in file:
      match = re.search(r'<version>(.+)-SNAPSHOT</version>', line)
      if match:
        return match.group(1)
    raise RuntimeError('Could not find release version in branch %s' % (src_branch))

def get_artifacts(release, path='target/releases/'):
  return [os.path.join(path, 'elasticsearch-%s.%s' % (release, t)) for t in ['deb', 'tar.gz', 'zip']]

def generate_checksums(files):
  res = []
  for release_file in files:
    directory = os.path.dirname(release_file)
    file = os.path.basename(release_file)
    checksum_file = '%s.sha1.txt' % file
    
    if os.system('cd %s; shasum %s > %s' % (directory, file, checksum_file)):
      raise RuntimeError('Failed to generate checksum for file %s' % release_file)
    res = res + [os.path.join(directory, checksum_file), release_file]
  return res

def smoke_test_release(release, files):
  for release_file in files:
    if not os.path.isfile(release_file):
      raise RuntimeError('Smoketest failed missing file %s' % (release_file))
    tmp_dir = tempfile.mkdtemp()
    if release_file.endswith('tar.gz'):
      run('tar -xzf %s -C %s' % (release_file, tmp_dir)) 
    elif release_file.endswith('zip'):
      run('unzip %s -d %s' % (release_file, tmp_dir)) 
    else:
      continue # nothing to do here 
    es_run_path = os.path.join(tmp_dir, 'elasticsearch-%s' % (release), 'bin/elasticsearch')
    print('  Smoke testing package [%s]' % release_file)
    print('  Starting elasticsearch deamon from [%s]' % os.path.join(tmp_dir, 'elasticsearch-%s' % release))
    run('%s; %s -Des.node.name=smoke_tester' % (java_exe(), es_run_path))
    conn = HTTPConnection('127.0.0.1', 9200, 20);
    wait_for_node_startup()
    try:
      try:
        conn.request('GET', '')
        res = conn.getresponse()
        if res.status == 200:
          version = json.loads(res.read().decode("utf-8"))['version']
          if release != version['number']:
            raise RuntimeError('Expected version [%s] but was [%s]' % (release, version['number']))
          if version['build_snapshot']:
            raise RuntimeError('Expected non snapshot version')
          if version['build_hash'].strip() !=  get_head_hash():
            raise RuntimeError('HEAD hash does not match expected [%s] but got [%s]' % (get_head_hash(), version['build_hash']))
        else:
          raise RuntimeError('Expected HTTP 200 but got %s' % res.status)
      finally:
        conn.request('POST', '/_cluster/nodes/_local/_shutdown')
        time.sleep(1) # give the node some time to shut down
        if conn.getresponse().status != 200:
          raise RuntimeError('Expected HTTP 200 but got %s on node shutdown' % res.status)

    finally:
      conn.close()
    shutil.rmtree(tmp_dir)

def merge_tag_push(remote, src_branch, release_version, dry_run):
  run('git checkout %s' %  src_branch)
  run('git merge %s' %  release_branch(release_version))
  run('git tag v%s' % release_version)
  if not dry_run:
    run('git push %s %s' % (remote, src_branch)) # push the commit
    run('git push %s v%s' % (remote, release_version)) # push the tag
  else:
    print('  dryrun [True] -- skipping push to remote %s' % remote)

def publish_artifacts(artifacts, base='elasticsearch/elasticsearch', dry_run=True):
  location = os.path.dirname(os.path.realpath(__file__))
  for artifact in artifacts:
    if dry_run:
      print('Skip Uploading %s to Amazon S3' % artifact)
    else:
      print('Uploading %s to Amazon S3' % artifact)
      # requires boto to be installed but it is not available on python3k yet so we use a dedicated tool
      run('python %s/upload-s3.py --file %s ' % (location, os.path.abspath(artifact)))

def print_sonartype_notice():
  settings = os.path.join(os.path.expanduser('~'), '.m2/settings.xml')
  if os.path.isfile(settings):
     with open(settings) as settings_file:
       for line in settings_file:
         if line.strip() == '<id>sonatype-nexus-snapshots</id>':
           # moving out - we found the indicator no need to print the warning
           return 
  print("""
    NOTE: No sonartype settings detected, make sure you have configured
    your sonartype credentials in '~/.m2/settings.xml':

    <settings>
    ...
    <servers>
      <server>
        <id>sonatype-nexus-snapshots</id>
        <username>your-jira-id</username>
        <password>your-jira-pwd</password>
      </server>
      <server>
        <id>sonatype-nexus-staging</id>
        <username>your-jira-id</username>
        <password>your-jira-pwd</password>
      </server>
    </servers>
    ...
  </settings>
  """)

def check_s3_credentials():
  if not env.get('AWS_ACCESS_KEY_ID', None) or not env.get('AWS_SECRET_ACCESS_KEY', None):
    raise RuntimeError('Could not find "AWS_ACCESS_KEY_ID" / "AWS_SECRET_ACCESS_KEY" in the env variables please export in order to upload to S3')

VERSION_FILE = 'src/main/java/org/elasticsearch/Version.java'    
POM_FILE = 'pom.xml'

# we print a notice if we can not find the relevant infos in the ~/.m2/settings.xml 
print_sonartype_notice()
if __name__ == '__main__':
  parser = argparse.ArgumentParser(description='Builds and publishes a Elasticsearch Release')
  parser.add_argument('--branch', '-b', metavar='master', default=get_current_branch(),
                       help='The branch to release from. Defaults to the current branch.')
  parser.add_argument('--cpus', '-c', metavar='1', default=1,
                       help='The number of cpus to use for running the test. Default is [1]')
  parser.add_argument('--skiptests', '-t', dest='tests', action='store_false',
                      help='Skips tests before release. Tests are run by default.')
  parser.set_defaults(tests=True)
  parser.add_argument('--remote', '-r', metavar='origin', default='origin',
                      help='The remote to push the release commit and tag to. Default is [origin]')
  parser.add_argument('--publish', '-d', dest='dryrun', action='store_false',
                      help='Publishes the release. Disable by default.')
  parser.set_defaults(dryrun=True)
  args = parser.parse_args()

  src_branch = args.branch
  remote = args.remote
  run_tests = args.tests
  dry_run = args.dryrun
  cpus = args.cpus
  if not dry_run:
    check_s3_credentials()
    print('WARNING: dryrun is set to "false" - this will push and publish the release') 
    input('Press Enter to continue...')

  print(''.join(['-' for _ in range(80)]))
  print('Preparing Release from branch [%s] running tests: [%s] dryrun: [%s]' % (src_branch, run_tests, dry_run))
  print('  JAVA_HOME is [%s]' % JAVA_HOME)
  print('  Running with maven command: [%s] ' % (MVN))
  release_version = find_release_version(src_branch)
  head_hash = get_head_hash()
  run_mvn('clean') # clean the env!
  print('  Release version: [%s]' % release_version)
  create_release_branch(remote, src_branch, release_version)
  print('  Created release branch [%s]' % (release_branch(release_version)))
  success = False
  try:
    remove_maven_snapshot(POM_FILE, release_version)
    remove_version_snapshot(VERSION_FILE, release_version)
    print('  Done removing snapshot version')
    add_pending_files(VERSION_FILE, POM_FILE)
    commit_release(release_version)
    print('  Committed release version [%s]' % (release_version))
    print(''.join(['-' for _ in range(80)]))
    print('Building Release candidate')
    input('Press Enter to continue...')
    print('  Running maven builds now - run-tests [%s]' % run_tests)
    build_release(run_tests=run_tests, dry_run=True, cpus=cpus)
    artifacts = get_artifacts(release_version)
    artifacts_and_checksum = generate_checksums(artifacts)
    smoke_test_release(release_version, artifacts)
    print(''.join(['-' for _ in range(80)]))
    print('Finish Release -- dry_run: %s' % dry_run)
    input('Press Enter to continue...')
    print('  merge release branch, tag and push to %s %s -- dry_run: %s' % (remote, src_branch, dry_run))
    merge_tag_push(remote, src_branch, release_version, dry_run)
    print('  publish artifacts to S3 -- dry_run: %s' % dry_run)
    publish_artifacts(artifacts_and_checksum, dry_run=dry_run)
    print('  publish maven artifacts -- dry_run: %s' % dry_run)
    if not dry_run:
      build_release(run_tests=False, dry_run=dry_run)
    success = True
  finally:
    if not success:
      run('git reset --hard HEAD')
      run('git checkout %s' %  src_branch)
    elif dry_run:
      run('git reset --hard %s' % head_hash)
      run('git tag -d v%s' % release_version) 
    # we delete this one anyways
    run('git branch -D %s' %  (release_branch(release_version)))