# Licensed to the Apache Software Foundation (ASF) 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 argparse
import re
import subprocess
import sys
import urllib.error
import urllib.parse
import urllib.request
import json
import os
from enum import Enum
import time
import urllib.request, urllib.error, urllib.parse

class Version(object):
  def __init__(self, major, minor, bugfix, prerelease):
    self.major = major
    self.minor = minor
    self.bugfix = bugfix
    self.prerelease = prerelease
    self.previous_dot_matcher = self.make_previous_matcher()
    self.dot = '%d.%d.%d' % (self.major, self.minor, self.bugfix)
    self.constant = 'LUCENE_%d_%d_%d' % (self.major, self.minor, self.bugfix)

  @classmethod
  def parse(cls, value):
    match = re.search(r'(\d+)\.(\d+).(\d+)(.1|.2)?', value)
    if match is None:
      raise argparse.ArgumentTypeError('Version argument must be of format x.y.z(.1|.2)?')
    parts = [int(v) for v in match.groups()[:-1]]
    parts.append({ None: 0, '.1': 1, '.2': 2 }[match.groups()[-1]])
    return Version(*parts)

  def __str__(self):
    return self.dot

  def make_previous_matcher(self, prefix='', suffix='', sep='\\.'):
    if self.is_bugfix_release():
      pattern = '%s%s%s%s%d' % (self.major, sep, self.minor, sep, self.bugfix - 1)
    elif self.is_minor_release():
      pattern = '%s%s%d%s\\d+' % (self.major, sep, self.minor - 1, sep)
    else:
      pattern = '%d%s\\d+%s\\d+' % (self.major - 1, sep, sep)

    return re.compile(prefix + '(' + pattern + ')' + suffix)

  def is_bugfix_release(self):
    return self.bugfix != 0

  def is_minor_release(self):
    return self.bugfix == 0 and self.minor != 0

  def is_major_release(self):
    return self.bugfix == 0 and self.minor == 0

  def on_or_after(self, other):
    return (self.major > other.major or self.major == other.major and
           (self.minor > other.minor or self.minor == other.minor and
           (self.bugfix > other.bugfix or self.bugfix == other.bugfix and
           self.prerelease >= other.prerelease)))

  def gt(self, other):
    return (self.major > other.major or
           (self.major == other.major and self.minor > other.minor) or
           (self.major == other.major and self.minor == other.minor and self.bugfix > other.bugfix))

  def is_back_compat_with(self, other):
    if not self.on_or_after(other):
      raise Exception('Back compat check disallowed for newer version: %s < %s' % (self, other))
    return other.major + 1 >= self.major


class CommitterPgp():
    """
    A class to resolve a commiter's committer's PGP key from ASF records.
    The class looks up the committer's ASF id in a json file downloaded from
    https://whimsy.apache.org/public/public_ldap_people.json
    and if the committer has a PGP key, it's fingerprint is made available.
    """
    def __init__(self, asf_id, json_content = None):
        self.asf_id = asf_id
        self.fingerprint = None
        self.ldap_url = 'https://whimsy.apache.org/public/public_ldap_people.json'
        self.fingerprint = None
        self.fingerprint_short = None
        if json_content:
            self.ldap_json = json_content
        else:
            self.ldap_json = self.load_ldap()
        self.resolve()


    def load_ldap(self):
        try:
            with urllib.request.urlopen(self.ldap_url) as f:
                return json.load(f)
        except urllib.error.HTTPError as e:
            raise Exception(f'Failed to load {self.ldap_url}: {e}')


    def resolve(self):
        """ Resolve the PGP key fingerprint for the committer's ASF id """
        try:
            self.fingerprint = self.ldap_json['people'][self.asf_id]['key_fingerprints'][0].replace(" ", "").upper()
            self.fingerprint_short = self.fingerprint[-8:]
        except KeyError:
            raise Exception(f'No PGP key found for {self.asf_id}')


    def get_fingerprint(self):
        return self.fingerprint


    def get_short_fingerprint(self):
        return self.fingerprint_short


def run(cmd, cwd=None):
  try:
    output = subprocess.check_output(cmd, shell=True, stderr=subprocess.STDOUT, cwd=cwd)
  except subprocess.CalledProcessError as e:
    print(e.output.decode('utf-8'))
    raise e
  return output.decode('utf-8')

def update_file(filename, line_re, edit):
  infile = open(filename, 'r')
  buffer = []

  changed = False
  for line in infile:
    if not changed:
      match = line_re.search(line)
      if match:
        changed = edit(buffer, match, line)
        if changed is None:
          return False
        continue
    buffer.append(line)
  if not changed:
    raise Exception('Could not find %s in %s' % (line_re, filename))
  with open(filename, 'w') as f:
    f.write(''.join(buffer))
  return True


# branch types are "release", "stable" and "unstable"
class BranchType(Enum):
  unstable = 1
  stable   = 2
  release  = 3

def find_branch_type():
  output = subprocess.check_output('git status', shell=True)
  for line in output.split(b'\n'):
    if line.startswith(b'On branch '):
      branchName = line.split(b' ')[-1]
      break
  else:
    raise Exception('git status missing branch name')

  if branchName == b'main':
    return BranchType.unstable
  if re.match(r'branch_(\d+)x', branchName.decode('UTF-8')):
    return BranchType.stable
  if re.match(r'branch_(\d+)_(\d+)', branchName.decode('UTF-8')):
    return BranchType.release
  raise Exception('Cannot run %s on feature branch' % sys.argv[0].rsplit('/', 1)[-1])


def download(name, urlString, tmpDir, quiet=False, force_clean=True):
  if not quiet:
      print("Downloading %s" % urlString)
  startTime = time.time()
  fileName = '%s/%s' % (tmpDir, name)
  if not force_clean and os.path.exists(fileName):
    if not quiet and fileName.find('.asc') == -1:
      print('    already done: %.1f MB' % (os.path.getsize(fileName)/1024./1024.))
    return
  try:
    attemptDownload(urlString, fileName)
  except Exception as e:
    print('Retrying download of url %s after exception: %s' % (urlString, e))
    try:
      attemptDownload(urlString, fileName)
    except Exception as e:
      raise RuntimeError('failed to download url "%s"' % urlString) from e
  if not quiet and fileName.find('.asc') == -1:
    t = time.time()-startTime
    sizeMB = os.path.getsize(fileName)/1024./1024.
    print('    %.1f MB in %.2f sec (%.1f MB/sec)' % (sizeMB, t, sizeMB/t))


def attemptDownload(urlString, fileName):
  raw_request = urllib.request.Request(urlString)
  raw_request.add_header('User-Agent', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Firefox/78.0')
  raw_request.add_header('Accept', 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8')
  fIn = urllib.request.urlopen(raw_request)
  fOut = open(fileName, 'wb')
  success = False
  try:
    while True:
      s = fIn.read(65536)
      if s == b'':
        break
      fOut.write(s)
    fOut.close()
    fIn.close()
    success = True
  finally:
    fIn.close()
    fOut.close()
    if not success:
      os.remove(fileName)

version_prop_re = re.compile(r'baseVersion\s*=\s*([\'"])(.*)\1')

lucene_version_prop_re = re.compile(r'org\.apache\.lucene:\*=(.*?)\n')

def find_current_version():
  script_path = os.path.dirname(os.path.realpath(__file__))
  top_level_dir = os.path.join(os.path.abspath("%s/" % script_path), os.path.pardir, os.path.pardir)
  return version_prop_re.search(open('%s/build.gradle' % top_level_dir).read()).group(2).strip()


def find_current_lucene_version():
  script_path = os.path.dirname(os.path.realpath(__file__))
  top_level_dir = os.path.join(os.path.abspath("%s/" % script_path), os.path.pardir, os.path.pardir)
  versions_file = open('%s/versions.props' % top_level_dir).read()
  return lucene_version_prop_re.search(versions_file).group(1).strip()


def extract_jira_issues_from_title(title):
  """Return (cleaned_title, links) where links list unique JIRA issues found in title."""
  jira = re.compile(r'(?:SOLR|LUCENE|INFRA)-\d+')

  seen = set()
  links = [
    {'name': m, 'url': f'https://issues.apache.org/jira/browse/{m}'}
    for m in jira.findall(title)
    if not (m in seen or seen.add(m))
  ]

  cleaned = title
  # Remove variants at start or when slash-separated, then normalize whitespace
  cleaned = re.sub(r'^\s*/\s*' + jira.pattern + r'[\s:]*', '', cleaned)
  cleaned = re.sub(r'\s+/\s*' + jira.pattern + r'[\s:]*', ' ', cleaned)
  cleaned = re.sub(r'^' + jira.pattern + r'[\s:]*', '', cleaned)
  cleaned = re.sub(r'^\s*/\s*', '', cleaned).strip()
  cleaned = re.sub(r'\s+', ' ', cleaned)

  return cleaned, links


if __name__ == '__main__':
  print('This is only a support module, it cannot be run')
  sys.exit(1)