# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import csv
from io import StringIO

from cosmos_predict1.utils.easy_io.handlers.base import BaseFileHandler


class CsvHandler(BaseFileHandler):
    def load_from_fileobj(self, file, **kwargs):
        del kwargs
        reader = csv.reader(file)
        return list(reader)

    def dump_to_fileobj(self, obj, file, **kwargs):
        del kwargs
        writer = csv.writer(file)
        if not all(isinstance(row, list) for row in obj):
            raise ValueError("Each row must be a list")
        writer.writerows(obj)

    def dump_to_str(self, obj, **kwargs):
        del kwargs
        output = StringIO()
        writer = csv.writer(output)
        if not all(isinstance(row, list) for row in obj):
            raise ValueError("Each row must be a list")
        writer.writerows(obj)
        return output.getvalue()