"""Galerie publique -- accessible sans authentification."""

import asyncio
import logging
from datetime import datetime
from pathlib import Path

import httpx
from fastapi import APIRouter, Request, Query
from fastapi.responses import HTMLResponse, RedirectResponse, Response
from fastapi.templating import Jinja2Templates

logger = logging.getLogger(__name__)
router = APIRouter()

_templates = Jinja2Templates(directory=Path(__file__).parent.parent.parent / "frontend" / "templates")


@router.get("/", response_class=HTMLResponse)
async def index(request: Request):
    return RedirectResponse(url="/gallery")


@router.get("/gallery", response_class=HTMLResponse)
async def gallery_page(request: Request):
    cfg = request.app.state.config
    if not cfg.gallery.public_enabled:
        return HTMLResponse("<h1>Galerie desactivee</h1>", status_code=403)
    return _templates.TemplateResponse(request, "public/gallery.html", {"config": cfg})


@router.get("/api/gallery/photos")
async def api_gallery_photos(
    request: Request,
    page: int = Query(default=1, ge=1),
    limit: int = Query(default=24, ge=1, le=100),
    event_slug: str = Query(default=None, description="Filtrer par slug d'événement"),
):
    pb = request.app.state.photobooth_service
    cfg = request.app.state.config

    all_photos = await pb.get_media_collection(limit=500)
    photos = [p for p in all_photos if _is_image(p)]

    # Filtre par événement si demandé
    if event_slug:
        event_svc = getattr(request.app.state, "event_service", None)
        if event_svc:
            ev = await event_svc.get_event_by_slug(event_slug)
            if ev:
                started_at = ev["started_at"] or 0.0
                ended_at = ev["ended_at"] or datetime.now().timestamp()
                # Construire un index mtime par stem ET par nom complet
                mtime_index: dict[str, float] = {}
                for media_dir_candidate in [
                    Path(cfg.photobooth.media_dir),
                    Path("/home/pi/photobooth-data/media/processed_full"),
                    Path("/home/pi/photobooth-data/media"),
                ]:
                    if media_dir_candidate.exists():
                        for f in media_dir_candidate.iterdir():
                            if f.is_file():
                                mt = f.stat().st_mtime
                                mtime_index[f.name] = mt   # uuid.jpg
                                mtime_index[f.stem] = mt   # uuid
                        break

                def _in_event(p: dict) -> bool:
                    pid = _get_id(p)
                    stem = pid.rsplit(".", 1)[0] if "." in pid else pid
                    mt = mtime_index.get(pid) or mtime_index.get(stem) or 0.0
                    return mt > 0 and started_at <= mt <= ended_at
                photos = [p for p in photos if _in_event(p)]

    total = len(photos)
    start = (page - 1) * limit
    end = start + limit
    page_photos = photos[start:end]

    for p in page_photos:
        pid = _get_id(p)
        p["full_url"] = pb.media_url(pid)
        p["thumb_url"] = pb.thumbnail_url(pid)
        p["download_url"] = f"/api/gallery/download/{pid}"

    return {
        "photos": page_photos,
        "total": total,
        "page": page,
        "pages": max(1, (total + limit - 1) // limit),
        "event_slug": event_slug,
    }


@router.get("/api/gallery/download/{photo_id}")
async def download_photo(request: Request, photo_id: str):
    """Proxy la photo full-res avec Content-Disposition et nom basé sur l'événement + date photo."""
    pb = request.app.state.photobooth_service
    cfg = request.app.state.config
    event_svc = getattr(request.app.state, "event_service", None)

    # Toujours fetcher depuis localhost (base_url), pas l'URL publique
    local_url = f"{pb._base.rstrip('/')}/media/full/{photo_id}"

    # Nom de l'événement (lisible) + date de la photo depuis le disque
    event_name = (cfg.event.name or cfg.event.slug or "Photomaton").replace(" ", "_")
    slug = cfg.event.slug or "photomaton"

    # Tenter de récupérer la vraie date depuis le fichier
    photo_date = datetime.now().strftime("%Y-%m-%d_%H-%M")
    try:
        media_dir = Path(cfg.photobooth.media_dir)
        candidates = list(media_dir.glob(f"{photo_id}*"))
        if candidates:
            mtime = candidates[0].stat().st_mtime
            photo_date = datetime.fromtimestamp(mtime).strftime("%Y-%m-%d_%H-%M")
    except Exception:
        pass

    safe_name = "".join(c if c.isalnum() or c in "-_." else "_" for c in event_name)
    filename = f"{safe_name}_{photo_date}.jpg"

    try:
        async with httpx.AsyncClient(timeout=30.0) as client:
            r = await client.get(local_url)
            r.raise_for_status()

        if event_svc:
            asyncio.create_task(event_svc.increment(slug, "downloads"))

        content_type = r.headers.get("content-type", "image/jpeg")
        return Response(
            content=r.content,
            media_type=content_type,
            headers={
                "Content-Disposition": f'attachment; filename="{filename}"',
                "Content-Length": str(len(r.content)),
                "Cache-Control": "no-cache",
            },
        )
    except Exception as e:
        logger.warning("Download proxy échoue (%s): %s", photo_id, e)
        return RedirectResponse(url=pb.media_url(photo_id))


def _is_image(item: dict) -> bool:
    t = item.get("type", item.get("mediaitem_type", "image"))
    return str(t).lower() in ("image", "still", "photo")


def _get_id(item: dict) -> str:
    return str(item.get("id", item.get("filename", item.get("uid", ""))))