#!/usr/bin/env python

# Copyright (c) 2009, Google Inc. All rights reserved.
#
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# modification, are permitted provided that the following conditions are
# met:
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#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# Checks Python's known list of committers against lists.webkit.org and SVN history.


import logging
import os
import subprocess
import re
import urllib2
from datetime import date, datetime, timedelta
from optparse import OptionParser

from webkitpy.common.config.committers import CommitterList
from webkitpy.common.checkout.changelog import ChangeLogEntry
from webkitpy.common.checkout.scm import Git
from webkitpy.common.net.bugzilla import Bugzilla

# WebKit includes a built copy of BeautifulSoup in Scripts/webkitpy
# so this import should always succeed.
from webkitpy.thirdparty.BeautifulSoup import BeautifulSoup

_log = logging.getLogger(__name__)

def print_list_if_non_empty(title, list_to_print):
    if not list_to_print:
        return
    print # Newline before the list
    print title
    for item in list_to_print:
        print item


class CommitterListFromMailingList(object):
    committers_list_url = "http://lists.webkit.org/mailman/roster/webkit-committers"
    reviewers_list_url = "http://lists.webkit.org/mailman/roster/webkit-reviewers"

    def _fetch_emails_from_page(self, url):
        page = urllib2.urlopen(url)
        soup = BeautifulSoup(page)

        emails = []
        # Grab the cells in the first column (which happens to be the bug ids).
        for email_item in soup('li'):
            email_link = email_item.find("a")
            email = email_link.string.replace(" at ", "@") # The email is obfuscated using " at " instead of "@".
            emails.append(email)
        return emails

    @staticmethod
    def _commiters_not_found_in_email_list(committers, emails):
        missing_from_mailing_list = []
        for committer in committers:
            for email in committer.emails:
                if email in emails:
                    break
            else:
                missing_from_mailing_list.append(committer)
        return missing_from_mailing_list

    @staticmethod
    def _emails_not_found_in_committer_list(committers, emails):
        email_to_committer_map = {}
        for committer in committers:
            for email in committer.emails:
                email_to_committer_map[email] = committer

        return filter(lambda email: not email_to_committer_map.get(email), emails)

    def check_for_emails_missing_from_list(self, committer_list):
        committer_emails = self._fetch_emails_from_page(self.committers_list_url)
        list_name = "webkit-committers@lists.webkit.org"

        missing_from_mailing_list = self._commiters_not_found_in_email_list(committer_list.committers(), committer_emails)
        print_list_if_non_empty("Committers missing from %s:" % list_name, missing_from_mailing_list)

        users_missing_from_committers = self._emails_not_found_in_committer_list(committer_list.committers(), committer_emails)
        print_list_if_non_empty("Subcribers to %s missing from contributors.json:" % list_name, users_missing_from_committers)


        reviewer_emails = self._fetch_emails_from_page(self.reviewers_list_url)
        list_name = "webkit-reviewers@lists.webkit.org"

        missing_from_mailing_list = self._commiters_not_found_in_email_list(committer_list.reviewers(), reviewer_emails)
        print_list_if_non_empty("Reviewers missing from %s:" % list_name, missing_from_mailing_list)

        missing_from_reviewers = self._emails_not_found_in_committer_list(committer_list.reviewers(), reviewer_emails)
        print_list_if_non_empty("Subcribers to %s missing from reviewers in contributors.json:" % list_name, missing_from_reviewers)

        missing_from_committers = self._emails_not_found_in_committer_list(committer_list.committers(), reviewer_emails)
        print_list_if_non_empty("Subcribers to %s completely missing from contributors.json:" % list_name, missing_from_committers)


class CommitterListFromGit(object):
    login_to_email_address = {
        'aliceli1' : 'alice.liu@apple.com',
        'bdash' : 'mrowe@apple.com',
        'bdibello' : 'bdibello@apple.com', # Bruce DiBello, only 4 commits: r10023, r9548, r9538, r9535
        'cblu' : 'cblu@apple.com',
        'cpeterse' : 'cpetersen@apple.com',
        'eseidel' : 'eric@webkit.org',
        'gdennis' : 'gdennis@webkit.org',
        'goldsmit' : 'goldsmit@apple.com', # Debbie Goldsmith, only one commit r8839
        'gramps' : 'gramps@apple.com',
        'honeycutt' : 'jhoneycutt@apple.com',
        'jdevalk' : 'joost@webkit.org',
        'jens' : 'jens@apple.com',
        'justing' : 'justin.garcia@apple.com',
        'kali' : 'kali@apple.com', # Christy Warren, did BIDI work, 5 commits: r8815, r8802, r8801, r8791, r8773, r8603
        'kjk' : 'kkowalczyk@gmail.com',
        'kmccullo' : 'kmccullough@apple.com',
        'kocienda' : 'kocienda@apple.com',
        'lamadio' : 'lamadio@apple.com', # Lou Amadio, only 2 commits: r17949 and r17783
        'lars' : 'lars@kde.org',
        'lweintraub' : 'lweintraub@apple.com',
        'lypanov' : 'lypanov@kde.org',
        'mhay' : 'mhay@apple.com', # Mike Hay, 3 commits: r3813, r2552, r2548
        'ouch' : 'ouch@apple.com', # John Louch
        'pyeh' : 'patti@apple.com', # Patti Yeh, did VoiceOver work in WebKit
        'rjw' : 'rjw@apple.com',
        'seangies' : 'seangies@apple.com', # Sean Gies?, only 5 commits: r16600, r16592, r16511, r16489, r16484
        'sheridan' : 'sheridan@apple.com', # Shelly Sheridan
        'thatcher' : 'timothy@apple.com',
        'tomernic' : 'timo@apple.com',
        'trey' : 'trey@usa.net',
        'tristan' : 'tristan@apple.com',
        'vicki' : 'vicki@apple.com',
        'voas' : 'voas@apple.com', # Ed Voas, did some Carbon work in WebKit
        'zack' : 'zack@kde.org',
        'zimmermann' : 'zimmermann@webkit.org',
    }

    def __init__(self):
        self._last_commit_time_by_author_cache = {}

    def _fetch_authors_and_last_commit_time_from_git_log(self):
        last_commit_dates = {}
        git_log_args = ['git', 'log', '--reverse', '--pretty=format:%ae %at']
        process = subprocess.Popen(git_log_args, stdout=subprocess.PIPE)

        # eric@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc 1257090899
        line_regexp = re.compile("^(?P<author>.+)@\S+ (?P<timestamp>\d+)$")
        while True:
            output_line = process.stdout.readline()
            if output_line == '' and process.poll() != None:
                return last_commit_dates

            match_result = line_regexp.match(output_line)
            if not match_result:
                _log.error("Failed to match line: %s" % output_line)
                exit(1)
            last_commit_dates[match_result.group('author')] = float(match_result.group('timestamp'))

    def _fill_in_emails_for_old_logins(self):
        authors_missing_email = filter(lambda author: author.find('@') == -1, self._last_commit_time_by_author_cache)
        authors_with_email = filter(lambda author: author.find('@') != -1, self._last_commit_time_by_author_cache)
        prefixes_of_authors_with_email = map(lambda author: author.split('@')[0], authors_with_email)

        for author in authors_missing_email:
            # First check to see if we have a manual mapping from login to email.
            author_email = self.login_to_email_address.get(author)

            # Most old logins like 'darin' are now just 'darin@apple.com', so check for a prefix match if a manual mapping was not found.
            if not author_email and author in prefixes_of_authors_with_email:
                author_email_index = prefixes_of_authors_with_email.index(author)
                author_email = authors_with_email[author_email_index]

            if not author_email:
                # No known email mapping, likely not an active committer.  We could log here.
                continue

            # _log.info("%s -> %s" % (author, author_email)) # For sanity checking.
            no_email_commit_time = self._last_commit_time_by_author_cache.get(author)
            email_commit_time = self._last_commit_time_by_author_cache.get(author_email)
            # We compare the timestamps for extra sanity even though we could assume commits before email address were used for login are always going to be older.
            if not email_commit_time or email_commit_time < no_email_commit_time:
                self._last_commit_time_by_author_cache[author_email] = no_email_commit_time
            del self._last_commit_time_by_author_cache[author]

    def _last_commit_by_author(self):
        if not self._last_commit_time_by_author_cache:
            self._last_commit_time_by_author_cache = self._fetch_authors_and_last_commit_time_from_git_log()
            self._fill_in_emails_for_old_logins()
            del self._last_commit_time_by_author_cache['(no author)'] # The initial svn import isn't very useful.
        return self._last_commit_time_by_author_cache

    @staticmethod
    def _print_three_column_row(widths, values):
        print "%s%s%s" % (values[0].ljust(widths[0]), values[1].ljust(widths[1]), values[2])

    def possibly_expired_committers(self, committer_list):
        authors_and_last_commits = self._last_commit_by_author().items()
        authors_and_last_commits.sort(lambda a,b: cmp(a[1], b[1]), reverse=True)
        committer_cutof = date.today() - timedelta(days=365)
        retired_authors_and_last_commits = []
        for (author, last_commit) in authors_and_last_commits:
            last_commit_date = date.fromtimestamp(last_commit)
            if committer_cutof > last_commit_date:
                retired_authors_and_last_commits.append((author, last_commit))
        return retired_authors_and_last_commits

    def possibly_inactive_reviewers(self, committer_list):
        git_log_args = ['git', 'log', '--since=1.year']
        process = subprocess.Popen(git_log_args, stdout=subprocess.PIPE)
        git_output, err = process.communicate()

        comment_regex = re.compile(r'^Date: .+?\n+(.+?)(?:^commit |\Z)', re.MULTILINE | re.DOTALL)
        reviewed_by_regexp = re.compile(ChangeLogEntry.reviewed_by_regexp, re.MULTILINE)
        
        reviewers = committer_list.reviewers()

        for comment in comment_regex.findall(git_output):
            reviewer_match = reviewed_by_regexp.search(comment)
            if reviewer_match:
                reviewers_text = reviewer_match.group('reviewer').decode('utf-8', 'backslashreplace')
                # reviewers might be something like "Darin Adler and Dave Hyatt".
                # Rather than trying to fuzzy match names, find known reviewers and remove them from the list.
                for reviewer in reviewers:
                    if reviewer.mentioned_in_text(reviewers_text):
                        reviewers.remove(reviewer)
                        break

        return reviewers

    def print_possibly_expired_committers(self, committer_list):
        retired_authors_and_last_commits = self.possibly_expired_committers(committer_list)
        column_widths = [13, 25]
        print
        print "Committers who have not committed within one year:"
        self._print_three_column_row(column_widths, ("Last Commit", "Committer Email", "Committer Record"))
        for (author, last_commit) in retired_authors_and_last_commits:
            committer_record = committer_list.committer_by_email(author)
            last_commit_date = date.fromtimestamp(last_commit)
            self._print_three_column_row(column_widths, (str(last_commit_date), author, committer_record))

    def print_possibly_inactive_reviewers(self, committer_list):
        inactive_reviewers = self.possibly_inactive_reviewers(committer_list)
        
        column_widths = [13, 25]
        print
        print "Reviewers who have not reviewed within one year:"
        for contributor in inactive_reviewers:
            print "\"{}\" {}".format(contributor.full_name.encode("utf-8"), contributor.bugzilla_email())

    def print_committers_missing_from_committer_list(self, committer_list):
        missing_from_contributors_json = []
        last_commit_time_by_author = self._last_commit_by_author()
        for author in last_commit_time_by_author:
            if not committer_list.committer_by_email(author):
                missing_from_contributors_json.append(author)

        never_committed = []
        for committer in committer_list.committers():
            for email in committer.emails:
                if last_commit_time_by_author.get(email):
                    break
            else:
                never_committed.append(committer)

        print_list_if_non_empty("Historical committers missing from contributors.json:", missing_from_contributors_json)
        print_list_if_non_empty("Committers in contributors.json who have never committed:", never_committed)


class CommitterListBugzillaChecker(object):
    def __init__(self):
        self._bugzilla = Bugzilla()

    def _has_invalid_bugzilla_email(self, committer):
        return self._bugzilla.queries.is_invalid_bugzilla_email(committer.bugzilla_email())

    def print_committers_with_invalid_bugzilla_emails(self, committer_list):
        print # Print a newline before we start hitting bugzilla (it logs about logging in).
        print "Checking committer emails against bugzilla (this will take a long time)"
        committers_with_invalid_bugzilla_email = filter(self._has_invalid_bugzilla_email, committer_list.committers())
        print_list_if_non_empty("Committers with invalid bugzilla email:", committers_with_invalid_bugzilla_email)


def main():
    parser = OptionParser()
    parser.add_option("-b", "--check-bugzilla-emails", action="store_true", help="Check the bugzilla_email for each committer against bugs.webkit.org")
    parser.add_option("-d", "--dump", action="store_true", help="Dump the contributor list as JSON to stdout (suitable for saving to contributors.json)")
    parser.add_option("-c", "--canonicalize", action="store_true", help="Canonicalize contributors.json, rewriting it in-place")

    (options, args) = parser.parse_args()

    committer_list = CommitterList()
    if options.dump:
        print committer_list.as_json()
        return 0;

    if options.canonicalize:
        print "Updating contributors.json in-place..."
        committer_list.reformat_in_place()
        print "Done"
        return 0;

    CommitterListFromMailingList().check_for_emails_missing_from_list(committer_list)
 
    if not Git.in_working_directory("."):
        print """\n\nWARNING: validate-committer-lists requires a git checkout.
The following checks are disabled:
 - List of inactive committers
 - List of inactive reviewers
 - List of historical committers missing from contributors.json
"""
        return 1

    svn_committer_list = CommitterListFromGit()
    svn_committer_list.print_possibly_expired_committers(committer_list)
    svn_committer_list.print_possibly_inactive_reviewers(committer_list)
    svn_committer_list.print_committers_missing_from_committer_list(committer_list)

    if options.check_bugzilla_emails:
        CommitterListBugzillaChecker().print_committers_with_invalid_bugzilla_emails(committer_list)


if __name__ == "__main__":
    main()