# SPDX-License-Identifier: GPL-2.0+
#
# Copyright 2023 Google LLC
#

"""Handles parsing of buildman arguments

This creates the argument parser and uses it to parse the arguments passed in
"""

import argparse
import os
import pathlib
import sys

from u_boot_pylib import gitutil
from patman import project
from patman import settings

PATMAN_DIR = pathlib.Path(__file__).parent
HAS_TESTS = os.path.exists(PATMAN_DIR / "func_test.py")


class ErrorCatchingArgumentParser(argparse.ArgumentParser):
    def __init__(self, **kwargs):
        self.exit_state = None
        self.catch_error = False
        super().__init__(**kwargs)

    def error(self, message):
        if self.catch_error:
            self.message = message
        else:
            super().error(message)

    def exit(self, status=0, message=None):
        if self.catch_error:
            self.exit_state = True
        else:
            super().exit(status, message)


def add_send_args(par):
    """Add arguments for the 'send' command

    Arguments:
        par (ArgumentParser): Parser to add to
    """
    par.add_argument(
        '-c', '--count', dest='count', type=int, default=-1,
        help='Automatically create patches from top n commits')
    par.add_argument(
        '-e', '--end', type=int, default=0,
        help='Commits to skip at end of patch list')
    par.add_argument(
        '-i', '--ignore-errors', action='store_true',
        dest='ignore_errors', default=False,
        help='Send patches email even if patch errors are found')
    par.add_argument(
        '-l', '--limit-cc', dest='limit', type=int, default=None,
        help='Limit the cc list to LIMIT entries [default: %(default)s]')
    par.add_argument(
        '-m', '--no-maintainers', action='store_false',
        dest='add_maintainers', default=True,
        help="Don't cc the file maintainers automatically")
    default_arg = None
    top_level = gitutil.get_top_level()
    if top_level:
        default_arg = os.path.join(top_level, 'scripts',
                                   'get_maintainer.pl') + ' --norolestats'
    par.add_argument(
        '--get-maintainer-script', dest='get_maintainer_script', type=str,
        action='store',
        default=default_arg,
        help='File name of the get_maintainer.pl (or compatible) script.')
    par.add_argument(
        '-r', '--in-reply-to', type=str, action='store',
        help="Message ID that this series is in reply to")
    par.add_argument(
        '-s', '--start', dest='start', type=int, default=0,
        help='Commit to start creating patches from (0 = HEAD)')
    par.add_argument(
        '-t', '--ignore-bad-tags', action='store_true', default=False,
        help='Ignore bad tags / aliases (default=warn)')
    par.add_argument(
        '--no-binary', action='store_true', dest='ignore_binary',
        default=False,
        help="Do not output contents of changes in binary files")
    par.add_argument(
        '--no-check', action='store_false', dest='check_patch', default=True,
        help="Don't check for patch compliance")
    par.add_argument(
        '--tree', dest='check_patch_use_tree', default=False,
        action='store_true',
        help=("Set `tree` to True. If `tree` is False then we'll pass "
              "'--no-tree' to checkpatch (default: tree=%(default)s)"))
    par.add_argument(
        '--no-tree', dest='check_patch_use_tree', action='store_false',
        help="Set `tree` to False")
    par.add_argument(
        '--no-tags', action='store_false', dest='process_tags', default=True,
        help="Don't process subject tags as aliases")
    par.add_argument(
        '--no-signoff', action='store_false', dest='add_signoff',
        default=True, help="Don't add Signed-off-by to patches")
    par.add_argument(
        '--smtp-server', type=str,
        help="Specify the SMTP server to 'git send-email'")
    par.add_argument(
        '--keep-change-id', action='store_true',
        help='Preserve Change-Id tags in patches to send.')


def _add_show_comments(parser):
    parser.add_argument('-c', '--show-comments', action='store_true',
                        help='Show comments from each patch')


def add_send_subparser(subparsers):
    """Add the 'send' subparser

    Args:
        subparsers (argparse action): Subparser parent

    Return:
        ArgumentParser: send subparser
    """
    send = subparsers.add_parser(
        'send', help='Format, check and email patches (default command)')
    send.add_argument(
        '-b', '--branch', type=str,
        help="Branch to process (by default, the current branch)")
    send.add_argument(
        '-n', '--dry-run', action='store_true', dest='dry_run',
        default=False, help="Do a dry run (create but don't email patches)")
    send.add_argument(
        '--cc-cmd', dest='cc_cmd', type=str, action='store',
        default=None, help='Output cc list for patch file (used by git)')
    add_send_args(send)
    send.add_argument('patchfiles', nargs='*')
    return send


def add_status_subparser(subparsers):
    """Add the 'status' subparser

    Args:
        subparsers (argparse action): Subparser parent

    Return:
        ArgumentParser: status subparser
    """
    status = subparsers.add_parser('status',
                                   help='Check status of patches in patchwork')
    _add_show_comments(status)
    status.add_argument(
        '-d', '--dest-branch', type=str,
        help='Name of branch to create with collected responses')
    status.add_argument('-f', '--force', action='store_true',
                        help='Force overwriting an existing branch')
    status.add_argument('-T', '--single-thread', action='store_true',
                        help='Disable multithreading when reading patchwork')
    return status


def setup_parser():
    """Set up command-line parser

    Returns:
        argparse.Parser object
    """
    epilog = '''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.'''

    parser = ErrorCatchingArgumentParser(epilog=epilog)
    parser.add_argument(
        '-D', '--debug', action='store_true',
        help='Enabling debugging (provides a full traceback on error)')
    parser.add_argument(
        '-N', '--no-capture', action='store_true',
        help='Disable capturing of console output in tests')
    parser.add_argument('-p', '--project', default=project.detect_project(),
                        help="Project name; affects default option values and "
                        "aliases [default: %(default)s]")
    parser.add_argument('-P', '--patchwork-url',
                        default='https://patchwork.ozlabs.org',
                        help='URL of patchwork server [default: %(default)s]')
    parser.add_argument(
        '-T', '--thread', action='store_true', dest='thread',
        default=False, help='Create patches as a single thread')
    parser.add_argument(
        '-v', '--verbose', action='store_true', dest='verbose', default=False,
        help='Verbose output of errors and warnings')
    parser.add_argument(
        '-X', '--test-preserve-dirs', action='store_true',
        help='Preserve and display test-created directories')
    parser.add_argument(
        '-H', '--full-help', action='store_true', dest='full_help',
        default=False, help='Display the README file')

    subparsers = parser.add_subparsers(dest='cmd')
    add_send_subparser(subparsers)
    add_status_subparser(subparsers)

    # Only add the 'test' action if the test data files are available.
    if HAS_TESTS:
        test_parser = subparsers.add_parser('test', help='Run tests')
        test_parser.add_argument('testname', type=str, default=None, nargs='?',
                                 help="Specify the test to run")

    parsers = {
        'main': parser,
        }
    return parsers


def parse_args(argv=None, config_fname=None, parsers=None):
    """Parse command line arguments from sys.argv[]

    Args:
        argv (str or None): Arguments to process, or None to use sys.argv[1:]
        config_fname (str): Config file to read, or None for default, or False
            for an empty config

    Returns:
        tuple containing:
            options: command line options
            args: command lin arguments
    """
    if not parsers:
        parsers = setup_parser()
    parser = parsers['main']

    # Parse options twice: first to get the project and second to handle
    # defaults properly (which depends on project)
    # Use parse_known_args() in case 'cmd' is omitted
    if not argv:
        argv = sys.argv[1:]

    args, rest = parser.parse_known_args(argv)
    if hasattr(args, 'project'):
        settings.Setup(parser, args.project, argv, config_fname)
        args, rest = parser.parse_known_args(argv)

    # If we have a command, it is safe to parse all arguments
    if args.cmd:
        args = parser.parse_args(argv)
    elif not args.full_help:
        # No command, so insert it after the known arguments and before the ones
        # that presumably relate to the 'send' subcommand
        nargs = len(rest)
        argv = argv[:-nargs] + ['send'] + rest
        args = parser.parse_args(argv)

    return args