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# -*- coding: utf-8 -*-

# Copyright (c) 2021, Andrew Pantuso (@ajpantuso) <ajpantuso@gmail.com>
# Copyright (c) 2018, Dag Wieers (@dagwieers) <dag@wieers.com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import absolute_import, division, print_function
__metaclass__ = type

import csv
from io import BytesIO, StringIO

from ansible.module_utils.common.text.converters import to_native
from ansible.module_utils.six import PY3


class CustomDialectFailureError(Exception):
    pass


class DialectNotAvailableError(Exception):
    pass


CSVError = csv.Error


def initialize_dialect(dialect, **kwargs):
    # Add Unix dialect from Python 3
    class unix_dialect(csv.Dialect):
        """Describe the usual properties of Unix-generated CSV files."""
        delimiter = ','
        quotechar = '"'
        doublequote = True
        skipinitialspace = False
        lineterminator = '\n'
        quoting = csv.QUOTE_ALL

    csv.register_dialect("unix", unix_dialect)

    if dialect not in csv.list_dialects():
        raise DialectNotAvailableError("Dialect '%s' is not supported by your version of python." % dialect)

    # Create a dictionary from only set options
    dialect_params = dict((k, v) for k, v in kwargs.items() if v is not None)
    if dialect_params:
        try:
            csv.register_dialect('custom', dialect, **dialect_params)
        except TypeError as e:
            raise CustomDialectFailureError("Unable to create custom dialect: %s" % to_native(e))
        dialect = 'custom'

    return dialect


def read_csv(data, dialect, fieldnames=None):
    BOM = to_native(u'\ufeff')
    data = to_native(data, errors='surrogate_or_strict')
    if data.startswith(BOM):
        data = data[len(BOM):]

    if PY3:
        fake_fh = StringIO(data)
    else:
        fake_fh = BytesIO(data)

    reader = csv.DictReader(fake_fh, fieldnames=fieldnames, dialect=dialect)

    return reader