#!/usr/bin/env python3
"""Compact first-frame grid for one subdir, exo view only (37149196_left)."""
import subprocess, sys
from io import BytesIO
from pathlib import Path
from PIL import Image, ImageDraw, ImageFont

ROOT = Path("/home/jimin/droid/collected_datasets/rlwrld_datasets_jonghoon/ICLR")
SUB = sys.argv[1] if len(sys.argv) > 1 else "white_spray"
VIEW = sys.argv[2] if len(sys.argv) > 2 else "37149196_left"   # exo
NCOL = 6
TW, PAD, LBL = 320, 6, 20


def first_frame(mp4):
    out = subprocess.run(["ffmpeg", "-nostdin", "-loglevel", "error", "-i", str(mp4),
                          "-frames:v", "1", "-f", "image2pipe", "-vcodec", "png", "pipe:1"],
                         capture_output=True).stdout
    return Image.open(BytesIO(out)).convert("RGB") if out else None


def font(s):
    p = "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf"
    return ImageFont.truetype(p, s) if Path(p).exists() else ImageFont.load_default()


eps = sorted([d for d in (ROOT / SUB).iterdir() if d.is_dir() and d.name.isdigit()])
imgs, th = [], None
for ep in eps:
    im = first_frame(ep / "recorded_videos" / f"{VIEW}.mp4")
    if im:
        w, h = im.size; nh = round(TW * h / w); im = im.resize((TW, nh)); th = th or nh
    imgs.append((ep.name, im))
th = th or 180

n = len(imgs); ncol = min(NCOL, n); nrow = (n + ncol - 1) // ncol
cw, ch = TW, th + LBL
W = ncol * cw + (ncol + 1) * PAD
H = 30 + nrow * ch + (nrow + 1) * PAD
cv = Image.new("RGB", (W, H), (24, 24, 28)); d = ImageDraw.Draw(cv)
d.text((8, 7), f"{SUB} — exo ({VIEW}) — {n} episodes", fill=(235, 235, 240), font=font(16))
for i, (name, im) in enumerate(imgs):
    r, c = divmod(i, ncol)
    x = PAD + c * (cw + PAD); y = 30 + PAD + r * (ch + PAD)
    if im: cv.paste(im, (x, y))
    else:
        d.rectangle([x, y, x + cw, y + th], fill=(50, 40, 40)); d.text((x + 8, y + th // 2), "missing", fill=(200, 120, 120), font=font(13))
    d.text((x + 3, y + th + 3), name, fill=(255, 210, 90), font=font(14))
out = ROOT / f"first_frame_grid_{SUB}_exo.png"
cv.save(out); print(f"saved {out} ({W}x{H}), {n} eps")