#!/usr/bin/env python3
"""Download 360+x panoramic mp4s one-by-one, cut into 15fps/100-frame clips,
keep only clips overlapping a 'dynamic' action, delete the rest + the source mp4.

Usage:
  python3 extract_dynamic_clips.py --only <uuid> --max-clips 2 --keep-src   # test one
  python3 extract_dynamic_clips.py                                          # full run (resume-safe)
"""
import argparse, json, os, subprocess, sys, glob, shutil, traceback

BASE = os.path.dirname(os.path.abspath(__file__))
TAL_DIR = os.path.join(BASE, "TAL_annotations")
INDEX = os.path.join(BASE, "index.json")
OUT_DIR = os.path.join(BASE, "dynamic_clips")
DL_DIR = os.path.join(BASE, "_dl_tmp")
DONE_FILE = os.path.join(OUT_DIR, "_done.txt")
REPO = "quchenyuan/360x_dataset_HR"

FPS = 15
CLIP_FRAMES = 100
CLIP_SEC = CLIP_FRAMES / FPS  # 6.6667s

DYNAMIC = {
    "walking", "running", "dancing", "workout", "driving", "pushing", "clapping",
    "firework", "moving things", "pouring", "farming", "cleaning", "housekeeping",
    "playing", "playing instrument", "dressing", "cooking", "preparing food",
    "opening", "hygiene practices", "eating", "drinking",
}


def log(*a):
    print(*a, flush=True)


def dynamic_segments(uuid):
    """Return list of (start_sec, end_sec, action) for dynamic actions in this uuid."""
    f = os.path.join(TAL_DIR, uuid + ".json")
    if not os.path.exists(f):
        return []
    d = json.load(open(f))
    segs = []
    for v in d.get("metadata", {}).values():
        dur = v.get("duration")
        if not dur or len(dur) != 2:
            continue
        acts = [a for a in v.get("action", {}).values() if a in DYNAMIC]
        if acts:
            segs.append((float(dur[0]), float(dur[1]), acts[0]))
    return segs


def ffprobe_duration(path):
    out = subprocess.check_output([
        "ffprobe", "-v", "error", "-select_streams", "v:0",
        "-show_entries", "format=duration", "-of", "default=nw=1:nk=1", path,
    ]).decode().strip()
    return float(out)


def planned_clips(duration, segs):
    """Yield (clip_idx, start_sec, end_sec, matched_actions) for clips kept."""
    n_full = int(duration * FPS) // CLIP_FRAMES  # full 100-frame clips only
    for i in range(n_full):
        cs = i * CLIP_SEC
        ce = (i + 1) * CLIP_SEC
        matched = sorted({a for (as_, ae, a) in segs if cs < ae and as_ < ce})
        if matched:
            yield i, cs, ce, matched


def extract_clip(src, cs, out_path):
    cmd = [
        "ffmpeg", "-nostdin", "-y", "-v", "error",
        "-ss", f"{cs:.5f}", "-i", src,
        "-vf", f"fps={FPS}", "-frames:v", str(CLIP_FRAMES),
        "-an", "-c:v", "libx264", "-preset", "veryfast", "-pix_fmt", "yuv420p",
        out_path,
    ]
    subprocess.run(cmd, check=True)


def download(uuid):
    from huggingface_hub import hf_hub_download
    return hf_hub_download(
        repo_id=REPO, repo_type="dataset",
        filename=f"panoramic/{uuid}.mp4", local_dir=DL_DIR,
    )


def process(uuid, max_clips=None, keep_src=False):
    segs = dynamic_segments(uuid)
    if not segs:
        log(f"[{uuid}] no dynamic segments -> skip (no download)")
        return {"uuid": uuid, "clips": 0, "skipped": "no_dynamic"}
    log(f"[{uuid}] {len(segs)} dynamic segments; downloading...")
    src = download(uuid)
    try:
        dur = ffprobe_duration(src)
        plan = list(planned_clips(dur, segs))
        if max_clips:
            plan = plan[:max_clips]
        outdir = os.path.join(OUT_DIR, uuid)
        os.makedirs(outdir, exist_ok=True)
        manifest = {"uuid": uuid, "duration": dur, "fps": FPS,
                    "clip_frames": CLIP_FRAMES, "clips": []}
        log(f"[{uuid}] dur={dur:.1f}s -> {len(plan)} dynamic clips")
        for idx, cs, ce, acts in plan:
            out = os.path.join(outdir, f"clip_{idx:04d}.mp4")
            extract_clip(src, cs, out)
            manifest["clips"].append({
                "idx": idx, "start": round(cs, 3), "end": round(ce, 3),
                "actions": acts, "file": os.path.basename(out),
            })
        json.dump(manifest, open(os.path.join(outdir, "manifest.json"), "w"),
                  ensure_ascii=False, indent=1)
        return {"uuid": uuid, "clips": len(manifest["clips"])}
    finally:
        if not keep_src:
            try:
                os.remove(src)
            except OSError:
                pass
            # clear hf metadata cache for this file
            for p in glob.glob(os.path.join(DL_DIR, ".cache", "huggingface", "**"),
                               recursive=True):
                pass
            shutil.rmtree(os.path.join(DL_DIR, "panoramic"), ignore_errors=True)


def load_done():
    if os.path.exists(DONE_FILE):
        return set(open(DONE_FILE).read().split())
    return set()


def mark_done(uuid):
    with open(DONE_FILE, "a") as f:
        f.write(uuid + "\n")


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--only", help="process a single uuid")
    ap.add_argument("--max-clips", type=int, default=None)
    ap.add_argument("--keep-src", action="store_true")
    args = ap.parse_args()

    os.makedirs(OUT_DIR, exist_ok=True)
    os.makedirs(DL_DIR, exist_ok=True)

    if args.only:
        uuids = [args.only]
    else:
        uuids = [e["uuid"] for e in json.load(open(INDEX))]

    done = load_done()
    total = len(uuids)
    for n, uuid in enumerate(uuids, 1):
        if uuid in done and not args.only:
            continue
        log(f"=== ({n}/{total}) {uuid} ===")
        try:
            r = process(uuid, max_clips=args.max_clips, keep_src=args.keep_src)
            if not args.only:
                mark_done(uuid)
            log(f"    done: {r}")
        except Exception:
            log(f"    ERROR on {uuid}:\n{traceback.format_exc()}")


if __name__ == "__main__":
    main()