"""Frozen legacy references, captured before retirement; compare the WebGPU world only."""
import base64, pathlib, sys, subprocess
sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent.parent / 'tools'))
from use_venv import ensure_playwright; ensure_playwright()
from browser import launch, consume_gpu_option
consume_gpu_option()
ROOT = pathlib.Path(__file__).resolve().parent.parent
GOLD = ROOT / 'test/fixtures/golden'
with launch(viewport={'width': 640, 'height': 480}) as (_, pg, url):
    errors=[]
    pg.on('pageerror', lambda e: errors.append(str(e)))
    pg.on('console', lambda m: errors.append(m.text) if m.type=='error' else None)
    pg.add_init_script('requestAnimationFrame=()=>0;')
    pg.goto(url); pg.evaluate('CAPS_CHECK')
    assert pg.evaluate('GPU.ok'), pg.evaluate('GPU.error')
    for scene in ['renderer','joins','sky','lamp','opening','magma','fire']:
        for look in ['pixel','smooth']:
            for zoom in [12,2]:
                pg.evaluate('(h)=>{generateWorld(424242,640,h,null);enterGame();GAME.paused=true;}',512 if scene=='joins' else 384)
                name = 'joins' if scene=='joins' else 't88-renderer' if scene in ['renderer','sky'] else 't88-light'
                pg.evaluate('() => {'+(ROOT / f'tools/scenes/{name}.js').read_text()+'}')
                if scene not in ['renderer','joins','sky']:
                    pg.evaluate('s=>lightScene(s)',scene)
                if scene=='joins':
                    pg.evaluate('SET.fog=false; CAM=[280,98];')
                if scene=='sky':
                    pg.evaluate('CAM=[320,55]; SET.fog=false;')
                pg.evaluate("""([look,zoom])=>{
                  SET.look=look;SET.zoom=zoom;SET.lighting='full';SET.lightEvery=1;SET.glow='low';
                  SM.t0=0; SM.surf=-1;
                  performance.now=()=>5000;resizeRender();bot.x=CAM[0]-bot.w/2;bot.y=CAM[1]-bot.h/2;
                  snapCamera();R.frame=1000;drawWorld();
                }""",[look,zoom])
                raw=pg.evaluate("""() => {
                  const c=document.createElement('canvas');c.width=384;c.height=288;
                  c.getContext('2d').drawImage(worldPixelContext().canvas,128,96,384,288,0,0,384,288);
                  return c.toDataURL().split(',')[1];
                }""")
                path=GOLD/f'{scene}-{look}-{zoom}.png'
                actual=base64.b64decode(raw)
                rgb=lambda data: subprocess.run(['magick','png:-','-alpha','off','-depth','8','rgb:-'],input=data,capture_output=True,check=True).stdout
                a,b=rgb(actual),rgb(path.read_bytes())
                ds=[abs(x-y) for x,y in zip(a,b)]
                mean=sum(ds)/len(ds);bad=sum(max(ds[i:i+3])>8 for i in range(0,len(ds),3))
                assert mean<0.5 and bad<384*288*0.003, (path.name,mean,bad)
                print('PASS golden',path.name,round(mean,4),bad)
                (ROOT/'shots'/('golden-'+path.name)).write_bytes(actual)
    assert not errors,errors