# 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,
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# See the License for the specific language governing permissions and
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import argparse
import os
import pickle

import numpy as np
from tqdm import tqdm

from cosmos_predict2._src.predict2.inference.get_t5_emb import (
    T5_MODEL_DIR,
    CosmosT5TextEncoder,
    CosmosT5TextEncoderConfig,
)

"""example command
python -m scripts.get_t5_embeddings_from_groot_dataset --dataset_path datasets/benchmark_train/gr1
"""


def parse_args() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(description="Compute T5 embeddings for text prompts")
    parser.add_argument(
        "--dataset_path", type=str, default="datasets/benchmark_train/gr1", help="Root path to the dataset"
    )
    parser.add_argument(
        "--prompt_prefix", type=str, default="The robot arm is performing a task. ", help="Prefix of the prompt"
    )
    parser.add_argument("--max_length", type=int, help="Maximum length of the text embedding")
    parser.add_argument("--cache_dir", type=str, default=T5_MODEL_DIR, help="Directory to cache the T5 model")
    parser.add_argument(
        "--meta_csv", type=str, default="datasets/benchmark_train/gr1/metadata.csv", help="Metadata csv file"
    )
    return parser.parse_args()


def main(args) -> None:
    meta_csv = args.meta_csv
    meta_lines = open(meta_csv).readlines()[1:]
    t5_xxl_dir = os.path.join(args.dataset_path, "t5_xxl")
    os.makedirs(t5_xxl_dir, exist_ok=True)
    meta_txt_dir = os.path.join(args.dataset_path, "metas")
    os.makedirs(meta_txt_dir, exist_ok=True)

    # Initialize T5
    encoder_config = CosmosT5TextEncoderConfig(ckpt_path=args.cache_dir)
    encoder = CosmosT5TextEncoder(config=encoder_config)

    for meta_line in tqdm(meta_lines):
        video_filename, prompt = meta_line.split(",", 1)
        prompt = prompt.strip("\n")
        if prompt.startswith('"') and prompt.endswith('"'):
            # Remove the quotes for robocasa dataset
            prompt = prompt[1:-1]
        prompt = args.prompt_prefix + prompt
        meta_txt_filename = os.path.join(meta_txt_dir, os.path.basename(video_filename).replace(".mp4", ".txt"))
        with open(meta_txt_filename, "w") as fp:
            fp.write(prompt)

        t5_xxl_filename = os.path.join(t5_xxl_dir, os.path.basename(video_filename).replace(".mp4", ".pickle"))
        if os.path.exists(t5_xxl_filename):
            print(f"Skipping {t5_xxl_filename} because it already exists")
            # Skip if the file already exists
            continue

        print(f"encoding prompt: {prompt}")

        # Compute T5 embeddings
        encoded_text, mask_bool = encoder.encode_prompts(prompt, max_length=args.max_length, return_mask=True)
        attn_mask = mask_bool.long()
        lengths = attn_mask.sum(dim=1).cpu()

        encoded_text = encoded_text.cpu().numpy().astype(np.float16)

        # trim zeros to save space
        encoded_text = [encoded_text[batch_id][: lengths[batch_id]] for batch_id in range(encoded_text.shape[0])]

        # Save T5 embeddings as pickle file
        with open(t5_xxl_filename, "wb") as fp:
            pickle.dump(encoded_text, fp)  # list of np.ndarray in (len, 1024)


if __name__ == "__main__":
    args = parse_args()
    main(args)