#!/usr/bin/env python3
"""Download hosted GRDR-TVR release assets from Hugging Face Hub."""

import argparse
import shutil
import tempfile
from pathlib import Path

REPO_ID = "JasonCoderMaker/GRDR-TVR"
DATASETS = ["msrvtt", "actnet", "didemo", "panda", "lsmdc"]
FEATURE_DATASETS = {"msrvtt", "actnet", "didemo", "panda", "lsmdc"}
GRDR_DATASETS = {"msrvtt", "actnet", "didemo", "panda", "lsmdc"}
XPOOL_FILES = {
    "actnet": "actnet_model_best.pth",
    "didemo": "didemo_model_best.pth",
    "lsmdc": "lsmdc_model_best.pth",
    "msrvtt": "msrvtt9k_model_best.pth",
    "panda": "panda_2150k_s42_model_best.pth",
}


def download_features(datasets, output_dir="./dataset/features"):
    from huggingface_hub import snapshot_download

    selected = [d for d in datasets if d in FEATURE_DATASETS]
    skipped = sorted(set(datasets) - set(selected))
    for dataset in skipped:
        print(f"Skipping {dataset} InternVideo2 features: not hosted in this repo")
    for dataset in selected:
        snapshot_download(
            repo_id=REPO_ID,
            repo_type="dataset",
            allow_patterns=f"InternVideo2/{dataset}/**",
            local_dir=output_dir,
            local_dir_use_symlinks=False,
        )
        print(f"Downloaded {dataset} InternVideo2 features")


def download_grdr(datasets, output_dir="./output/checkpoints"):
    from huggingface_hub import snapshot_download

    selected = [d for d in datasets if d in GRDR_DATASETS]
    for dataset in selected:
        snapshot_download(
            repo_id=REPO_ID,
            repo_type="dataset",
            allow_patterns=f"GRDR/{dataset}/best_model/**",
            local_dir=output_dir,
            local_dir_use_symlinks=False,
        )
        print(f"Downloaded {dataset} GRDR checkpoint")


def download_xpool(datasets, output_dir="./reranker/xpool/ckpt"):
    from huggingface_hub import hf_hub_download

    xpool_dir = Path(output_dir)
    xpool_dir.mkdir(parents=True, exist_ok=True)
    for dataset in datasets:
        filename = XPOOL_FILES.get(dataset)
        if filename is None:
            print(f"Skipping {dataset} X-Pool checkpoint: not hosted in this repo")
            continue
        with tempfile.TemporaryDirectory() as tmp:
            src = hf_hub_download(
                repo_id=REPO_ID,
                repo_type="dataset",
                filename=f"Xpool/{filename}",
                local_dir=tmp,
                local_dir_use_symlinks=False,
            )
            shutil.copy2(src, xpool_dir / filename)
        print(f"Downloaded {dataset} X-Pool checkpoint")


def main():
    parser = argparse.ArgumentParser(description="Download hosted GRDR-TVR release assets")
    parser.add_argument("--all", action="store_true", help="Download hosted features, GRDR checkpoints, and X-Pool checkpoints")
    parser.add_argument("--features", action="store_true", help="Download hosted InternVideo2 features")
    parser.add_argument("--grdr", action="store_true", help="Download GRDR checkpoints")
    parser.add_argument("--xpool", action="store_true", help="Download X-Pool checkpoints")
    parser.add_argument("--datasets", nargs="+", choices=DATASETS, default=["msrvtt", "actnet", "didemo", "panda"], help="Datasets to download")
    parser.add_argument("--features-dir", default="./dataset/features")
    parser.add_argument("--grdr-dir", default="./output/checkpoints")
    parser.add_argument("--xpool-dir", default="./reranker/xpool/ckpt")
    args = parser.parse_args()

    if not any([args.all, args.features, args.grdr, args.xpool]):
        parser.error("Select at least one component: --all, --features, --grdr, or --xpool")

    if args.all or args.features:
        download_features(args.datasets, args.features_dir)
    if args.all or args.grdr:
        download_grdr(args.datasets, args.grdr_dir)
    if args.all or args.xpool:
        download_xpool(args.datasets, args.xpool_dir)


if __name__ == "__main__":
    main()