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# Copyright 2024 The HuggingFace Inc. team. All rights reserved.
#
# 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.
# keys
import os
from pathlib import Path

from huggingface_hub.constants import HF_HOME

OBS_STR = "observation"
OBS_PREFIX = OBS_STR + "."
OBS_ENV_STATE = OBS_STR + ".environment_state"
OBS_STATE = OBS_STR + ".state"
# OBS_IMAGE (singular, legacy single-camera) and OBS_IMAGES (plural, modern
# multi-camera prefix) serve different purposes — keep them independent; do NOT
# collapse into "OBS_IMAGE + 's'".
OBS_IMAGE = "observation.image"            # legacy single-camera key
OBS_IMAGES = "observation.images"          # modern multi-camera prefix
NUM_IMAGE_SLOTS = 3                        # Qwen3-VL processor consumes image0..image2
OBS_LANGUAGE = OBS_STR + ".language"
OBS_LANGUAGE_TOKENS = OBS_LANGUAGE + ".tokens"
OBS_LANGUAGE_ATTENTION_MASK = OBS_LANGUAGE + ".attention_mask"

ACTION = "action"
REWARD = "next.reward"
TRUNCATED = "next.truncated"
DONE = "next.done"

ROBOTS = "robots"
TELEOPERATORS = "teleoperators"

# files & directories
CHECKPOINTS_DIR = "checkpoints"
LAST_CHECKPOINT_LINK = "last"
PRETRAINED_MODEL_DIR = "pretrained_model"
TRAINING_STATE_DIR = "training_state"

POLICY_PREPROCESSOR_DEFAULT_NAME = "policy_preprocessor"
POLICY_POSTPROCESSOR_DEFAULT_NAME = "policy_postprocessor"

if "LEROBOT_HOME" in os.environ:
    raise ValueError(
        f"You have a 'LEROBOT_HOME' environment variable set to '{os.getenv('LEROBOT_HOME')}'.\n"
        "'LEROBOT_HOME' is deprecated, please use 'HF_LEROBOT_HOME' instead."
    )

# cache dir
default_cache_path = Path(HF_HOME) / "lerobot"
HF_LEROBOT_HOME = Path(os.getenv("HF_LEROBOT_HOME", default_cache_path)).expanduser()

# calibration dir
default_calibration_path = HF_LEROBOT_HOME / "calibration"
HF_LEROBOT_CALIBRATION = Path(os.getenv("HF_LEROBOT_CALIBRATION", default_calibration_path)).expanduser()


# streaming datasets
LOOKBACK_BACKTRACKTABLE = 100
LOOKAHEAD_BACKTRACKTABLE = 100

# openpi
OPENPI_ATTENTION_MASK_VALUE = -65504.0

# LIBERO_KEY_* constants were removed (unused). A future LIBERO integration
# should put them in a dedicated module to keep utils robot-agnostic.