#!/usr/bin/env python

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# Checks Python's known list of committers against lists.webkit.org and SVN history.


import os
import subprocess
import re
import urllib2
from datetime import date, datetime, timedelta
from webkitpy.common.config.committers import CommitterList
from webkitpy.common.system.deprecated_logging import log, error
from webkitpy.common.checkout.scm import Git

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

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:
    committers_list_url = "http://lists.webkit.org/mailman/roster.cgi/webkit-committers"
    reviewers_list_url = "http://lists.webkit.org/mailman/roster.cgi/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 committer.py:" % 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 committer.py:" % 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 committers.py" % list_name, missing_from_committers)


class CommitterListFromGit:
    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:
                error("Failed to match line: %s" % output_line)
            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("%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 print_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_cuttof = date.today() - timedelta(days=365)
        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 authors_and_last_commits:
            last_commit_date = date.fromtimestamp(last_commit)
            if committer_cuttof > last_commit_date:
                committer_record = committer_list.committer_by_email(author)
                self._print_three_column_row(column_widths, (str(last_commit_date), author, committer_record))

    def print_committers_missing_from_committer_list(self, committer_list):
        missing_from_committers_py = []
        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_committers_py.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 committer.py:", missing_from_committers_py)
        print_list_if_non_empty("Committers in committer.py who have never committed:", never_committed)


def main():
    committer_list = CommitterList()
    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 committers ordered by last commit
 - List of historical committers missing from committers.py
"""
        return 1
    svn_committer_list = CommitterListFromGit()
    svn_committer_list.print_possibly_expired_committers(committer_list)
    svn_committer_list.print_committers_missing_from_committer_list(committer_list)

if __name__ == "__main__":
    main()