#!/usr/bin/env python3
"""Match a captured game frame against candidate .wmv files by frame signature.

Static + previously-captured frames. See docs/re/movie-binding.md."""
import numpy as np, subprocess, sys, os
from PIL import Image
W,H=32,18
def sig_img(path, crop_bottom=False):
    im=Image.open(path).convert("L")
    if crop_bottom:                      # movie frame -> what the capture can see
        w,h=im.size; im=im.crop((0,0,w,int(h*675/720)))
    a=np.asarray(im.resize((W,H)),dtype=np.float32).ravel()
    return (a-a.mean())/(a.std()+1e-6)
def movie_sigs(path, fps=1.0):
    out=f"/tmp/q9/fr_{os.path.basename(path).replace('.wmv','')}"
    os.makedirs(out, exist_ok=True)
    if not os.listdir(out):
        subprocess.run(["ffmpeg","-v","error","-i",path,"-vf",f"fps={fps},scale=160:90",
                        "-y",f"{out}/f%05d.png"],check=True)
    fs=sorted(os.listdir(out))
    return [(int(f[1:6]), sig_img(os.path.join(out,f), crop_bottom=True)) for f in fs]