"""Application settings for PunimTag Web."""

from __future__ import annotations

import os
from pathlib import Path

APP_TITLE = "PunimTag Web API"
APP_VERSION = "0.1.0"

# Photo storage settings
PHOTO_STORAGE_DIR = os.getenv("PHOTO_STORAGE_DIR", "data/uploads")


def _project_root() -> Path:
    """Repository root (parent of ``backend/``)."""
    return Path(__file__).resolve().parent.parent


def get_web_video_cache_directory() -> Path:
    """Filesystem directory for browser-safe transcoded MP4 cache.

    Resolution order:

    1. ``WEB_VIDEO_CACHE_DIR`` if set (absolute or relative to project root).
    2. Otherwise ``<parent of UPLOAD_DIR>/web_videos`` when ``UPLOAD_DIR`` or
       ``PENDING_PHOTOS_DIR`` is set (same layout as ``.../pending-photos`` next to
       ``.../web_videos``).
    3. Otherwise ``<project>/data/web_videos`` for local dev when no upload dir
       is configured on the API process.
    """
    explicit = (os.getenv("WEB_VIDEO_CACHE_DIR") or "").strip()
    if explicit:
        path = Path(explicit).expanduser()
        if not path.is_absolute():
            path = (_project_root() / path).resolve()
        else:
            path = path.resolve()
        path.mkdir(parents=True, exist_ok=True)
        return path

    pending_raw = (os.getenv("UPLOAD_DIR") or os.getenv("PENDING_PHOTOS_DIR") or "").strip()
    if pending_raw:
        pending = Path(pending_raw).expanduser()
        if not pending.is_absolute():
            pending = (_project_root() / pending).resolve()
        else:
            pending = pending.resolve()
        out = (pending.parent / "web_videos").resolve()
        out.mkdir(parents=True, exist_ok=True)
        return out

    fallback = (_project_root() / "data" / "web_videos").resolve()
    fallback.mkdir(parents=True, exist_ok=True)
    return fallback