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import argparse
import json
from pathlib import Path
import sys
from typing import Optional

import pandas as pd


PROJECT_ROOT = Path(__file__).resolve().parents[1]
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

from rr_label_study.oven_study import (  # noqa: E402
    MotionTemplates,
    _aggregate_summary,
    _annotate_phase_columns,
    _episode_metrics_from_frames,
    _interventional_validity,
    _load_demo,
)


INTERVENTION_KEYS = [
    "pre_ready_open_more_increases_pext",
    "pre_ready_open_more_trials",
    "pre_ready_hold_open_increases_pext",
    "pre_ready_hold_open_trials",
    "pre_ready_extract_success",
    "pre_ready_extract_trials",
    "pre_ready_wait_extract_success",
    "pre_ready_wait_trials",
    "post_ready_extract_success",
    "post_ready_extract_trials",
    "post_ready_open_more_low_gain",
    "post_ready_open_more_trials",
    "post_ready_hold_open_low_gain",
    "post_ready_hold_open_trials",
]


def _load_templates(result_dir: Path) -> MotionTemplates:
    with result_dir.joinpath("templates.json").open("r", encoding="utf-8") as handle:
        payload = json.load(handle)
    return MotionTemplates(**payload["templates"])


def _refresh_episode(
    result_dir: Path,
    episode_name: str,
    dataset_root: Optional[Path],
    checkpoint_stride: int,
) -> dict:
    dense_path = result_dir / f"{episode_name}.dense.csv"
    keyframes_path = result_dir / f"{episode_name}.keyframes.csv"
    metrics_path = result_dir / f"{episode_name}.metrics.json"

    dense_df = pd.read_csv(dense_path)
    dense_df = _annotate_phase_columns(dense_df)

    old_key_df = pd.read_csv(keyframes_path)
    keyframe_indices = old_key_df["frame_index"].astype(int).tolist()
    key_df = dense_df[dense_df["frame_index"].isin(keyframe_indices)].copy()
    key_df = key_df.sort_values("frame_index").reset_index(drop=True)
    key_df["keyframe_ordinal"] = range(len(key_df))

    with metrics_path.open("r", encoding="utf-8") as handle:
        old_metrics = json.load(handle)
    if dataset_root is None:
        interventions = {
            key: float(old_metrics[key]) for key in INTERVENTION_KEYS if key in old_metrics
        }
    else:
        episode_dir = dataset_root / "all_variations" / "episodes" / episode_name
        demo = _load_demo(episode_dir)
        templates = _load_templates(result_dir)
        interventions = _interventional_validity(
            demo=demo,
            templates=templates,
            frame_df=dense_df,
            checkpoint_stride=checkpoint_stride,
        )

    metrics = _episode_metrics_from_frames(
        frame_df=dense_df,
        key_df=key_df,
        episode_name=episode_name,
        description=str(old_metrics.get("description", "")),
        interventions=interventions,
    )

    dense_df.to_csv(dense_path, index=False)
    key_df.to_csv(keyframes_path, index=False)
    with metrics_path.open("w", encoding="utf-8") as handle:
        json.dump(metrics, handle, indent=2)
    return metrics


def main(argv=None) -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument("--result-dir", required=True)
    parser.add_argument("--dataset-root")
    parser.add_argument("--checkpoint-stride", type=int, default=16)
    parser.add_argument("--episodes", nargs="*")
    args = parser.parse_args(argv)

    result_dir = Path(args.result_dir)
    dataset_root = Path(args.dataset_root) if args.dataset_root else None
    episode_metrics = []
    if args.episodes:
        episode_names = args.episodes
    else:
        episode_names = sorted(
            path.stem.replace(".metrics", "")
            for path in result_dir.glob("episode*.metrics.json")
        )

    for episode_name in episode_names:
        episode_metrics.append(
            _refresh_episode(
                result_dir=result_dir,
                episode_name=episode_name,
                dataset_root=dataset_root,
                checkpoint_stride=args.checkpoint_stride,
            )
        )

    summary = _aggregate_summary(episode_metrics)
    with result_dir.joinpath("summary.json").open("w", encoding="utf-8") as handle:
        json.dump(summary, handle, indent=2)
    print(json.dumps(summary, indent=2))
    return 0


if __name__ == "__main__":
    raise SystemExit(main())