"""Serves the built Vue SPA from frontend/dist/ with history-mode fallback,
and the on-disk image library + thumbnails from /images.
"""

from pathlib import Path

from quart import Blueprint, abort, send_from_directory

FRONTEND_DIST = Path(__file__).resolve().parent.parent.parent / "frontend" / "dist"
IMAGES_ROOT = Path("/images")

frontend_bp = Blueprint("frontend", __name__)


@frontend_bp.route("/images/<path:subpath>")
async def serve_image(subpath: str):
    """Serve a file from the /images volume (originals + thumbnails).

    Without this route the SPA catch-all below would swallow image
    requests and return index.html, leaving the browser to render the
    aspect-ratio-shaped grey placeholder.
    """
    target = (IMAGES_ROOT / subpath).resolve()
    # Defend against path-traversal: refuse anything that escapes /images.
    try:
        target.relative_to(IMAGES_ROOT)
    except ValueError:
        abort(404)
    if not target.is_file():
        abort(404)
    return await send_from_directory(IMAGES_ROOT, subpath)


@frontend_bp.route("/")
@frontend_bp.route("/<path:subpath>")
async def serve_spa(subpath: str = ""):
    if subpath and (FRONTEND_DIST / subpath).is_file():
        return await send_from_directory(FRONTEND_DIST, subpath)
    return await send_from_directory(FRONTEND_DIST, "index.html")