#!/usr/bin/env python3
"""Verify this capture's prefix-named light/dark media, outside the repo's suffix gate."""
import hashlib
import json
import struct
import subprocess
from pathlib import Path

root = Path(__file__).resolve().parent
manifest = json.loads((root / 'manifest.json').read_text())
assets = {entry['path']: entry for entry in manifest['assets']}
for name, entry in assets.items():
    data = (root / name).read_bytes()
    assert len(data) == entry['bytes'], f'{name}: byte count differs'
    assert hashlib.sha256(data).hexdigest() == entry['sha256'], f'{name}: SHA differs'

def dimensions(path):
    if path.suffix == '.png':
        header = path.read_bytes()[:24]
        assert header[:8] == b'\x89PNG\r\n\x1a\n'
        return {'width': struct.unpack('>I', header[16:20])[0], 'height': struct.unpack('>I', header[20:24])[0]}
    result = subprocess.run(['ffprobe','-v','error','-count_frames','-show_entries','stream=codec_name,width,height,r_frame_rate,nb_read_frames:format=duration','-of','json',str(path)],check=True,text=True,capture_output=True)
    probe = json.loads(result.stdout)
    videos = [stream for stream in probe['streams'] if 'width' in stream]
    audios = [stream for stream in probe['streams'] if 'width' not in stream]
    assert len(videos) == 1 and not audios, f'{path.name}: expected silent video'
    video = videos[0]
    return {'width':video['width'],'height':video['height'],'codec':video['codec_name'],'fps':video['r_frame_rate'],'frames':int(video['nb_read_frames']),'durationSeconds':round(float(probe['format']['duration']),2),'audioStreams':0}

for pair in manifest['pairs']:
    light = dimensions(root / pair['light'])
    dark = dimensions(root / pair['dark'])
    assert light == dark == pair['expected'], f"{pair['name']}: theme mismatch {light} / {dark}"
print(f"Motion assets {len(assets)}/{len(assets)} exact; paired media {len(manifest['pairs'])}/{len(manifest['pairs'])} dimensions, timing and silence match.")