from fastapi import APIRouter, HTTPException, Query, Request
import json
from .utils import (
    _bucket_key,
    _key_exists,
    _list_prefix,
    _read_bucket_json,
    user_exists,
    BUCKET_ID,
)

router = APIRouter()


@router.get("/view_images")
def view_images(
    request: Request,
    user_id: str = Query(...),
    camera_name: str = Query(...),
    filter_label: str = Query(None, description="Optional filter: Buck, Doe, Mule, Whitetail")
):
    """
    Get images and detection info for a user's camera.
    Returns clickable URLs for each image.
    Optionally filter images based on labels (Buck, Doe, Mule, Whitetail).
    """
    # ── existence checks against the bucket ──────────────────────
    if not user_exists(user_id):
        raise HTTPException(status_code=404, detail="User not found")

    raw_prefix     = _bucket_key(user_id, camera_name, "raw")
    detection_key  = _bucket_key(user_id, camera_name, f"{camera_name}_detections.json")

    raw_files = _list_prefix(raw_prefix)
    if not raw_files:
        raise HTTPException(status_code=404, detail="Camera raw folder not found")

    if not _key_exists(detection_key):
        raise HTTPException(status_code=404, detail="Detection JSON not found")

    # ── load detections from bucket ───────────────────────────────
    detections = _read_bucket_json(detection_key)
    if detections is None:
        raise HTTPException(status_code=500, detail="Failed to read detection file")

    # ── build a set of filenames that exist in the bucket ─────────
    existing_filenames = {item.path.split("/")[-1] for item in raw_files}

    # ── validate filter label ─────────────────────────────────────
    valid_filters ={"doe", "mule bucks", "white tail bucks"}
    filter_lower = filter_label.lower() if filter_label else None
    if filter_lower and filter_lower not in valid_filters:
        raise HTTPException(
            status_code=400,
            detail=f"Invalid filter_label. Must be one of {valid_filters}"
        )

    # ── build response ────────────────────────────────────────────
    images = []
    for item in detections:
        filename = item["filename"]

        if filename in existing_filenames:
            item["image_url"] = f"https://huggingface.co/buckets/{BUCKET_ID}/resolve/{raw_prefix}/{filename}"
        else:
            item["missing"] = True
            item["image_url"] = None

        # Apply label filter if provided
        if filter_lower:
            filtered_detections = [
                det for det in item.get("detections", [])
                if any(lbl.lower().find(filter_lower) != -1 for lbl in det["label"].split("|"))
            ]
            if filtered_detections:
                item["detections"] = filtered_detections
                images.append(item)
        else:
            images.append(item)

    return {
        "success": True,
        "user_id": user_id,
        "camera_name": camera_name,
        "filter_label": filter_label,
        "images": images
    }