#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (c) 2011 The Chromium OS Authors.
#

"""See README for more information"""

from optparse import OptionParser
import os
import re
import sys
import unittest

if __name__ == "__main__":
    # Allow 'from patman import xxx to work'
    our_path = os.path.dirname(os.path.realpath(__file__))
    sys.path.append(os.path.join(our_path, '..'))

# Our modules
from patman import checkpatch
from patman import command
from patman import gitutil
from patman import patchstream
from patman import project
from patman import settings
from patman import terminal
from patman import test


parser = OptionParser()
parser.add_option('-H', '--full-help', action='store_true', dest='full_help',
       default=False, help='Display the README file')
parser.add_option('-c', '--count', dest='count', type='int',
       default=-1, help='Automatically create patches from top n commits')
parser.add_option('-i', '--ignore-errors', action='store_true',
       dest='ignore_errors', default=False,
       help='Send patches email even if patch errors are found')
parser.add_option('-l', '--limit-cc', dest='limit', type='int',
       default=None, help='Limit the cc list to LIMIT entries [default: %default]')
parser.add_option('-m', '--no-maintainers', action='store_false',
       dest='add_maintainers', default=True,
       help="Don't cc the file maintainers automatically")
parser.add_option('-n', '--dry-run', action='store_true', dest='dry_run',
       default=False, help="Do a dry run (create but don't email patches)")
parser.add_option('-p', '--project', default=project.DetectProject(),
                  help="Project name; affects default option values and "
                  "aliases [default: %default]")
parser.add_option('-r', '--in-reply-to', type='string', action='store',
                  help="Message ID that this series is in reply to")
parser.add_option('-s', '--start', dest='start', type='int',
       default=0, help='Commit to start creating patches from (0 = HEAD)')
parser.add_option('-t', '--ignore-bad-tags', action='store_true',
                  default=False, help='Ignore bad tags / aliases')
parser.add_option('-v', '--verbose', action='store_true', dest='verbose',
       default=False, help='Verbose output of errors and warnings')
parser.add_option('-T', '--thread', action='store_true', dest='thread',
                  default=False, help='Create patches as a single thread')
parser.add_option('--cc-cmd', dest='cc_cmd', type='string', action='store',
       default=None, help='Output cc list for patch file (used by git)')
parser.add_option('--no-binary', action='store_true', dest='ignore_binary',
                  default=False,
                  help="Do not output contents of changes in binary files")
parser.add_option('--no-check', action='store_false', dest='check_patch',
                  default=True,
                  help="Don't check for patch compliance")
parser.add_option('--no-tags', action='store_false', dest='process_tags',
                  default=True, help="Don't process subject tags as aliases")
parser.add_option('--smtp-server', type='str',
                  help="Specify the SMTP server to 'git send-email'")
parser.add_option('--test', action='store_true', dest='test',
                  default=False, help='run tests')

parser.usage += """

Create patches from commits in a branch, check them and email them as
specified by tags you place in the commits. Use -n to do a dry run first."""


# Parse options twice: first to get the project and second to handle
# defaults properly (which depends on project).
(options, args) = parser.parse_args()
settings.Setup(gitutil, parser, options.project, '')
(options, args) = parser.parse_args()

if __name__ != "__main__":
    pass

# Run our meagre tests
elif options.test:
    import doctest
    from patman import func_test

    sys.argv = [sys.argv[0]]
    result = unittest.TestResult()
    for module in (test.TestPatch, func_test.TestFunctional):
        suite = unittest.TestLoader().loadTestsFromTestCase(module)
        suite.run(result)

    for module in ['gitutil', 'settings', 'terminal']:
        suite = doctest.DocTestSuite(module)
        suite.run(result)

    # TODO: Surely we can just 'print' result?
    print(result)
    for test, err in result.errors:
        print(err)
    for test, err in result.failures:
        print(err)

# Called from git with a patch filename as argument
# Printout a list of additional CC recipients for this patch
elif options.cc_cmd:
    fd = open(options.cc_cmd, 'r')
    re_line = re.compile('(\S*) (.*)')
    for line in fd.readlines():
        match = re_line.match(line)
        if match and match.group(1) == args[0]:
            for cc in match.group(2).split('\0'):
                cc = cc.strip()
                if cc:
                    print(cc)
    fd.close()

elif options.full_help:
    pager = os.getenv('PAGER')
    if not pager:
        pager = 'more'
    fname = os.path.join(os.path.dirname(os.path.realpath(sys.argv[0])),
                         'README')
    command.Run(pager, fname)

# Process commits, produce patches files, check them, email them
else:
    gitutil.Setup()

    if options.count == -1:
        # Work out how many patches to send if we can
        options.count = gitutil.CountCommitsToBranch() - options.start

    col = terminal.Color()
    if not options.count:
        str = 'No commits found to process - please use -c flag'
        sys.exit(col.Color(col.RED, str))

    # Read the metadata from the commits
    if options.count:
        series = patchstream.GetMetaData(options.start, options.count)
        cover_fname, args = gitutil.CreatePatches(options.start, options.count,
                options.ignore_binary, series)

    # Fix up the patch files to our liking, and insert the cover letter
    patchstream.FixPatches(series, args)
    if cover_fname and series.get('cover'):
        patchstream.InsertCoverLetter(cover_fname, series, options.count)

    # Do a few checks on the series
    series.DoChecks()

    # Check the patches, and run them through 'git am' just to be sure
    if options.check_patch:
        ok = checkpatch.CheckPatches(options.verbose, args)
    else:
        ok = True

    cc_file = series.MakeCcFile(options.process_tags, cover_fname,
                                not options.ignore_bad_tags,
                                options.add_maintainers, options.limit)

    # Email the patches out (giving the user time to check / cancel)
    cmd = ''
    its_a_go = ok or options.ignore_errors
    if its_a_go:
        cmd = gitutil.EmailPatches(series, cover_fname, args,
                options.dry_run, not options.ignore_bad_tags, cc_file,
                in_reply_to=options.in_reply_to, thread=options.thread,
                smtp_server=options.smtp_server)
    else:
        print(col.Color(col.RED, "Not sending emails due to errors/warnings"))

    # For a dry run, just show our actions as a sanity check
    if options.dry_run:
        series.ShowActions(args, cmd, options.process_tags)
        if not its_a_go:
            print(col.Color(col.RED, "Email would not be sent"))

    os.remove(cc_file)