# coding=utf-8
# Copyright 2025 HuggingFace Inc.
#
# 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 logging
import os
import sys
import tempfile


sys.path.append("..")
from test_examples_utils import ExamplesTestsAccelerate, run_command  # noqa: E402


logging.basicConfig(level=logging.DEBUG)

logger = logging.getLogger()
stream_handler = logging.StreamHandler(sys.stdout)
logger.addHandler(stream_handler)


class InstructPix2Pix(ExamplesTestsAccelerate):
    def test_instruct_pix2pix_checkpointing_checkpoints_total_limit(self):
        with tempfile.TemporaryDirectory() as tmpdir:
            test_args = f"""
                examples/instruct_pix2pix/train_instruct_pix2pix.py
                --pretrained_model_name_or_path=hf-internal-testing/tiny-stable-diffusion-pipe
                --dataset_name=hf-internal-testing/instructpix2pix-10-samples
                --resolution=64
                --random_flip
                --train_batch_size=1
                --max_train_steps=6
                --checkpointing_steps=2
                --checkpoints_total_limit=2
                --output_dir {tmpdir}
                --seed=0
                """.split()

            run_command(self._launch_args + test_args)

            self.assertEqual(
                {x for x in os.listdir(tmpdir) if "checkpoint" in x},
                {"checkpoint-4", "checkpoint-6"},
            )

    def test_instruct_pix2pix_checkpointing_checkpoints_total_limit_removes_multiple_checkpoints(self):
        with tempfile.TemporaryDirectory() as tmpdir:
            test_args = f"""
                examples/instruct_pix2pix/train_instruct_pix2pix.py
                --pretrained_model_name_or_path=hf-internal-testing/tiny-stable-diffusion-pipe
                --dataset_name=hf-internal-testing/instructpix2pix-10-samples
                --resolution=64
                --random_flip
                --train_batch_size=1
                --max_train_steps=4
                --checkpointing_steps=2
                --output_dir {tmpdir}
                --seed=0
                """.split()

            run_command(self._launch_args + test_args)

            # check checkpoint directories exist
            self.assertEqual(
                {x for x in os.listdir(tmpdir) if "checkpoint" in x},
                {"checkpoint-2", "checkpoint-4"},
            )

            resume_run_args = f"""
                examples/instruct_pix2pix/train_instruct_pix2pix.py
                --pretrained_model_name_or_path=hf-internal-testing/tiny-stable-diffusion-pipe
                --dataset_name=hf-internal-testing/instructpix2pix-10-samples
                --resolution=64
                --random_flip
                --train_batch_size=1
                --max_train_steps=8
                --checkpointing_steps=2
                --output_dir {tmpdir}
                --seed=0
                --resume_from_checkpoint=checkpoint-4
                --checkpoints_total_limit=2
                """.split()

            run_command(self._launch_args + resume_run_args)

            # check checkpoint directories exist
            self.assertEqual(
                {x for x in os.listdir(tmpdir) if "checkpoint" in x},
                {"checkpoint-6", "checkpoint-8"},
            )
