# FILE: bot/youtube/uploader.py
# PATH: bot/youtube/uploader.py
from __future__ import annotations

import os
from typing import Any, Awaitable, Callable, Dict, Optional

from bot.youtube.metadata import build_metadata
from bot.youtube.resume import start_resumable_session, upload_resumable

ProgressCB = Callable[[int, int], Awaitable[None]]


def _watch_url(video_id: str) -> str:
    vid = (video_id or "").strip()
    return f"https://youtu.be/{vid}" if vid else ""


async def upload_video(
    *,
    access_token: str,
    file_path: str,
    title: str,
    description: str,
    privacy: str = "private",
    progress_cb: Optional[ProgressCB] = None,
) -> Dict[str, Any]:
    """Upload a video to YouTube via resumable upload.

    Returns:
      {"ok": True, "video_id": "...", "url": "...", "response": {...}}
      {"ok": False, "err": "...", "detail": "..."}
    """
    if not access_token:
        return {"ok": False, "err": "missing_access_token"}
    if not file_path or not os.path.exists(file_path):
        return {"ok": False, "err": "file_not_found"}

    try:
        total_bytes = int(os.path.getsize(file_path))
    except Exception:
        total_bytes = 0

    metadata = build_metadata(title=title, description=description, privacy=privacy)

    # 1) Start session
    start = await start_resumable_session(
        access_token=access_token,
        metadata=metadata,
        total_bytes=total_bytes,
    )
    if not (isinstance(start, dict) and start.get("ok") and start.get("session_url")):
        err = start.get("err", "start_failed") if isinstance(start, dict) else "start_failed"
        detail = start.get("detail") if isinstance(start, dict) else None
        out: Dict[str, Any] = {"ok": False, "err": err}
        if detail:
            out["detail"] = str(detail)[:700]
        return out

    session_url = str(start["session_url"])

    # 2) Upload chunks
    up = await upload_resumable(
        session_url=session_url,
        file_path=file_path,
        access_token=access_token,
        total_bytes=total_bytes,
        progress_cb=progress_cb,
    )
    if not (isinstance(up, dict) and up.get("ok")):
        err = up.get("err", "upload_failed") if isinstance(up, dict) else "upload_failed"
        detail = up.get("detail") if isinstance(up, dict) else None
        out2: Dict[str, Any] = {"ok": False, "err": err}
        if detail:
            out2["detail"] = str(detail)[:900]
        return out2

    resp = up.get("response") if isinstance(up, dict) else None
    if not isinstance(resp, dict):
        resp = {}

    video_id = str(resp.get("id") or resp.get("videoId") or "").strip()
    url = _watch_url(video_id)

    return {
        "ok": True,
        "video_id": video_id,
        "url": url,
        "response": resp,
    }