#!/usr/bin/env python3
"""
Scherm OCR — velocidade + SALVA texto extraído (pra medir acurácia depois).
Compara modelos de OCR (NuMarkdown, DeepSeek-OCR, DeepSeek-OCR-2, Qwen-VL) nas MESMAS páginas.

Diferença do run_ocr_pages.py: salva o markdown/texto que cada modelo extrai (pra comparar
qualidade contra ground-truth). Prompt parametrizável (DeepSeek usa formato próprio).

Uso:
  python3 run_ocr_accuracy.py --served-model deepseek-ocr --base-url http://localhost:8000/v1 \
     --pages-dir ./pages --doc-sizes 1 5 50 --concurrencies 1 4 --reps 3 \
     --prompt-style deepseek --out ./results --tag GPU --run-id RID
"""
import argparse, base64, json, os, time, urllib.request, statistics

PROMPTS = {
    # NuMarkdown / Qwen-VL: instrução de extração
    "numarkdown": "Extract all text from this document page as markdown.",
    # DeepSeek-OCR: formato grounding (doc oficial vLLM recipes)
    "deepseek": "<image>\n<|grounding|>Convert the document to markdown.",
}

def quantiles(xs):
    xs=sorted(x for x in xs if x is not None)
    if not xs: return {}
    def q(p):
        if len(xs)==1: return xs[0]
        i=p*(len(xs)-1); lo=int(i); frac=i-lo
        return xs[lo] if lo+1>=len(xs) else xs[lo]*(1-frac)+xs[lo+1]*frac
    return {"median":q(0.5),"q1":q(0.25),"q3":q(0.75),"min":xs[0],"max":xs[-1]}

def ocr_one_page(base_url, model, img_b64, max_tokens, prompt_text):
    """1 OCR. Retorna (ok, tokens_out, TEXTO_extraído)."""
    url=f"{base_url}/chat/completions"
    body={"model":model,"max_tokens":max_tokens,"temperature":0,"messages":[
          {"role":"user","content":[
            {"type":"text","text":prompt_text},
            {"type":"image_url","image_url":{"url":f"data:image/png;base64,{img_b64}"}}]}]}
    last_err=None
    for attempt in range(3):
        try:
            req=urllib.request.Request(url,data=json.dumps(body).encode(),
                                       headers={"Content-Type":"application/json"})
            with urllib.request.urlopen(req,timeout=600) as r:
                d=json.loads(r.read())
            txt=d.get("choices",[{}])[0].get("message",{}).get("content","")
            return True, d.get("usage",{}).get("completion_tokens",0), txt
        except Exception as e:
            last_err=e
            import time as _t; _t.sleep(2*(attempt+1))
    import sys; print(f"[FALHOU 3x] {repr(last_err)}", file=sys.stderr, flush=True)
    return False, 0, ""

def main():
    ap=argparse.ArgumentParser()
    ap.add_argument("--served-model",required=True)
    ap.add_argument("--base-url",required=True)
    ap.add_argument("--pages-dir",required=True)
    ap.add_argument("--doc-sizes",nargs="+",type=int,default=[1,5,50])
    ap.add_argument("--concurrencies",nargs="+",type=int,default=[1,4])
    ap.add_argument("--reps",type=int,default=3)
    ap.add_argument("--max-tokens",type=int,default=2048)  # OCR markdown pode ser longo
    ap.add_argument("--prompt-style",choices=["numarkdown","deepseek"],default="numarkdown")
    ap.add_argument("--model-label",default="")  # nome real do modelo (pra arquivos de texto)
    ap.add_argument("--out",required=True); ap.add_argument("--tag",default=""); ap.add_argument("--run-id",default="")
    a=ap.parse_args()
    os.makedirs(a.out,exist_ok=True)
    label=a.model_label or a.served_model.replace("/","_").replace(":","_")
    txtdir=os.path.join(a.out,"extracted_text",label); os.makedirs(txtdir,exist_ok=True)

    pngs=sorted(f for f in os.listdir(a.pages_dir) if f.endswith(".png") and not f.startswith("._"))
    pages_b64=[base64.b64encode(open(os.path.join(a.pages_dir,f),"rb").read()).decode() for f in pngs]
    prompt_text=PROMPTS[a.prompt_style]

    # 1) SALVAR o texto extraído de CADA página (1 vez, pra acurácia) — page-NN.md
    print(f"[*] {label}: extraindo texto de {len(pngs)} páginas (salvando pra acurácia)...",flush=True)
    for i,(fn,pb) in enumerate(zip(pngs,pages_b64)):
        ok,tok,txt=ocr_one_page(a.base_url,a.served_model,pb,a.max_tokens,prompt_text)
        outp=os.path.join(txtdir,fn.replace(".png",".md"))
        open(outp,"w").write(txt if ok else "[OCR_FAILED]")
        if i==0: print(f"    {fn}: {len(txt)} chars, {tok} tokens",flush=True)
    print(f"[*] textos salvos em {txtdir}",flush=True)

    # 2) matriz de VELOCIDADE (doc N págs sequenciais × conc docs simultâneos)
    from concurrent.futures import ThreadPoolExecutor
    safe=a.served_model.replace("/","_").replace(":","_")
    csv_path=os.path.join(a.out,f"ocr_{a.tag}_{a.run_id}_{safe}.csv")
    fcsv=open(csv_path,"w")
    fcsv.write("gpu,model,prompt_style,doc_pages,concurrency,n_ok,doc_latency_ms_median,ms_per_page_median,total_tok_s_median\n")
    def proc_doc(npages):
        t0=time.time(); tot=0
        for pb in pages_b64[:npages]:
            ok,tok,_=ocr_one_page(a.base_url,a.served_model,pb,a.max_tokens,prompt_text)
            if not ok: return None
            tot+=tok
        return (time.time()-t0)*1000.0, tot
    for npages in a.doc_sizes:
        if npages>len(pages_b64): print(f"[skip] {npages}>{len(pages_b64)}",flush=True); continue
        for conc in a.concurrencies:
            lats=[]; tps=[]
            for _ in range(a.reps):
                with ThreadPoolExecutor(max_workers=conc) as ex:
                    res=list(ex.map(lambda _:proc_doc(npages),range(conc)))
                for r in res:
                    if r: lats.append(r[0]); tps.append(r[1]/(r[0]/1000.0) if r[0]>0 else 0)
            ag=quantiles(lats); mlat=ag.get("median")
            fcsv.write(f"{a.tag},{a.served_model},{a.prompt_style},{npages},{conc},{len(lats)},"
                       f"{mlat or ''},{(mlat/npages) if mlat else ''},{quantiles(tps).get('median','')}\n"); fcsv.flush()
            print(f"  doc={npages}p conc={conc} n_ok={len(lats)} lat={mlat:.0f}ms" if mlat else f"  doc={npages}p conc={conc} n_ok=0",flush=True)
    fcsv.close()
    print(f"[OK] {a.served_model} -> {csv_path}",flush=True)

if __name__=="__main__": main()