#!/usr/bin/env python3
"""Check how much motion each joint video actually shows.
Compares each frame against frame 0; fraction of pixels with abs diff > 30.
"""
import sys
from pathlib import Path

import imageio.v2 as imageio
import numpy as np

ROOT = Path(sys.argv[1] if len(sys.argv) > 1 else
            "/home/zhanghao/scene/scenesmith_full/outputs/demo")

if ROOT.name.startswith("home_"):
    scenes = [ROOT]
else:
    scenes = sorted(d for d in ROOT.iterdir() if d.is_dir() and d.name.startswith("home_"))
moved_total, total = 0, 0
for sc in scenes:
    vd = sc / "joint_videos"
    if not vd.is_dir():
        continue
    vids = sorted(vd.glob("*.mp4"))
    n_vis, n_ok = 0, 0
    per = []
    for v in vids:
        a = imageio.mimread(str(v))
        f0 = a[0].astype(np.int16)
        best = 0.0
        for f in a[1:]:
            d = np.abs(f.astype(np.int16) - f0).max(axis=2)
            best = max(best, float((d > 30).mean()))
        per.append((v.stem, best))
        if best > 0.005:
            n_vis += 1
        n_ok += 1
    total += len(per)
    moved_total += n_vis
    vis = ", ".join(f"{s}:{m*100:.1f}%" for s, m in per if m > 0.005)
    print(f"{sc.name}: {n_vis}/{n_ok} visible motion  {vis}")
print(f"TOTAL: {moved_total}/{total} videos with visible motion")