import os, subprocess, shutil, json, re, orjson, requests
from pathlib import Path
from faster_whisper import WhisperModel

MEILI_URL = os.getenv("MEILI_URL", "http://meili:7700")
MEILI_KEY = os.getenv("MEILI_KEY", "")
LIB = Path(os.getenv("LIBRARY_ROOT", "/library"))
TRN = Path(os.getenv("TRANSCRIPT_ROOT", "/transcripts"))
TMP = Path(os.getenv("TMP_ROOT", "/tmpdl"))
MODEL_NAME = os.getenv("WHISPER_MODEL","large-v3")
COMPUTE = os.getenv("WHISPER_PRECISION","int8")

TRN.mkdir(parents=True, exist_ok=True)
LIB.mkdir(parents=True, exist_ok=True)
TMP.mkdir(parents=True, exist_ok=True)

model = WhisperModel(MODEL_NAME, compute_type=COMPUTE)

def log(feed):
    with open(TRN / "_feed.log", "a", encoding="utf-8") as f:
        import orjson as _oj
        f.write(_oj.dumps(feed).decode()+"\n")

def sanitize(name):
    return re.sub(r'[\\/:"*?<>|]+', ' ', name).strip()

def yt_dlp(url, outdir):
    outtmpl = str(outdir / "%(uploader)s/%(upload_date)s - %(title)s.%(ext)s")
    cmd = [
        "yt-dlp", "-o", outtmpl,
        "-f", "bv*+ba/best",
        "-x", "--audio-format", "m4a",
        "--write-thumbnail",
        "--no-playlist", "--no-warnings", "--restrict-filenames",
        url
    ]
    subprocess.check_call(cmd)
    media = list(outdir.rglob("*.[mM][pP]4")) + list(outdir.rglob("*.mkv")) + list(outdir.rglob("*.m4a")) + list(outdir.rglob("*.mp3"))
    return sorted(media, key=lambda p: p.stat().st_mtime)[-1:]

def transcribe(media_path: Path):
    segments, info = model.transcribe(str(media_path), vad_filter=True, language="auto")
    title = media_path.stem
    base = TRN / title
    segs = []
    text_parts = []
    for s in segments:
        segs.append({"start": s.start, "end": s.end, "text": s.text})
        text_parts.append(s.text)
    txt = " ".join(text_parts).strip()

    import orjson as _oj
    open(base.with_suffix(".json"), "wb").write(_oj.dumps({"file": str(media_path), "language": info.language, "segments": segs}))
    open(base.with_suffix(".txt"), "w", encoding="utf-8").write(txt)

    def fmt_ts(t): 
        h=int(t//3600); m=int((t%3600)//60); s=t-(h*3600+m*60)
        return f"{h:02}:{m:02}:{s:06.3f}".replace('.',',')
    with open(base.with_suffix(".srt"), "w", encoding="utf-8") as srt:
        for i,s in enumerate(segs,1):
            srt.write(f"{i}\n{fmt_ts(s['start'])} --> {fmt_ts(s['end'])}\n{s['text'].strip()}\n\n")
    with open(base.with_suffix(".vtt"), "w", encoding="utf-8") as vtt:
        vtt.write("WEBVTT\n\n")
        for s in segs:
            vtt.write(f"{fmt_ts(s['start']).replace(',', '.')} --> {fmt_ts(s['end']).replace(',', '.')} \n{s['text'].strip()}\n\n")
    return base

def index_meili(json_path: Path):
    doc = json.loads(open(json_path, "r", encoding="utf-8").read())
    title = Path(doc["file"]).stem
    date = re.findall(r"\b(\d{8})\b", title)
    payload = {
        "id": title,
        "type": "podcast",
        "title": title,
        "date": date[0] if date else "",
        "source": str(Path(LIB, Path(doc["file"]).name)),
        "text": " ".join(s["text"] for s in doc.get("segments", [])),
        "segments": doc.get("segments", []),
        "meta": {"language": doc.get("language", "")}
    }
    r = requests.post(f"{MEILI_URL}/indexes/library/documents",
                      headers={"Authorization": f"Bearer {MEILI_KEY}", "Content-Type":"application/json"},
                      data=__import__('orjson').dumps(payload))
    r.raise_for_status()

def handle_url(url: str):
    try:
        info = {"url": url, "status":"queued", "title":"", "uploader":"", "date":"", "path":""}
        log({**info, **{"status":"downloading"}})
        files = yt_dlp(url, TMP)
        for f in files:
            parts = f.relative_to(TMP).parts
            uploader = sanitize(parts[0]) if len(parts)>1 else "Unknown"
            dest_dir = LIB / uploader
            dest_dir.mkdir(parents=True, exist_ok=True)
            dest = dest_dir / sanitize(f.name)
            shutil.move(str(f), dest)
            import re as _re
            info.update({"title": dest.stem, "uploader": uploader,
                         "date": _re.findall(r"\b(\d{8})\b", dest.stem)[0] if _re.findall(r"\b(\d{8})\b", dest.stem) else "",
                         "path": str(dest)})
            log({**info, **{"status":"transcribing"}})
            base = transcribe(dest)
            index_meili(base.with_suffix(".json"))
            log({**info, **{"status":"done"}})
    except Exception as e:
        log({"url": url, "status":"error", "error": str(e)})
        raise