app.py

# app.py
import os
import uuid
import io
from PIL import Image
import gradio as gr
from sentence_transformers import SentenceTransformer
from google import genai
from qdrant_client import QdrantClient
from qdrant_client.http.models import VectorParams, Distance, PointStruct

GEMINI_API_KEY = os.environ.get("GEMINI_API_KEY")
QDRANT_URL = os.environ.get("QDRANT_URL")
QDRANT_API_KEY = os.environ.get("QDRANT_API_KEY")

print("Loading CLIP model...")
MODEL_ID = "sentence-transformers/clip-ViT-B-32-multilingual-v1"
clip_model = SentenceTransformer(MODEL_ID)

genai_client = genai.Client(api_key=GEMINI_API_KEY) if GEMINI_API_KEY else None

if not QDRANT_URL:
    raise RuntimeError("Set QDRANT_URL env var")
qclient = QdrantClient(url=QDRANT_URL, api_key=QDRANT_API_KEY)

COLLECTION = "lost_found_items"
VECTOR_SIZE = 512
if not qclient.collection_exists(COLLECTION):
    qclient.create_collection(
        collection_name=COLLECTION,
        vectors_config=VectorParams(size=VECTOR_SIZE, distance=Distance.COSINE),
    )

def embed_text(text: str):
    return clip_model.encode(text, convert_to_numpy=True)

def embed_image_pil(pil_img: Image.Image):
    return clip_model.encode(pil_img, convert_to_numpy=True)

def gen_tags_from_image_file(img_bytes: io.BytesIO) -> str:
    if not genai_client:
        return ""
    try:
        file_obj = genai_client.files.upload(file=img_bytes)
        prompt = ("Give 4 short tags (comma-separated) describing this item in the image. "
                  "Respond only with tags.")
        resp = genai_client.models.generate_content(model="gemini-2.5-flash",
                                                   contents=[prompt, file_obj])
        return resp.text.strip()
    except Exception:
        return ""

def add_item(mode: str, uploaded_image, text_description: str):
    item_id = str(uuid.uuid4())
    payload = {"mode": mode, "text": text_description}

    if uploaded_image:
        img_bytes = io.BytesIO()
        uploaded_image.save(img_bytes, format="PNG")
        img_bytes.seek(0)
        vec = embed_image_pil(uploaded_image).tolist()
        payload["has_image"] = True
        payload["tags"] = gen_tags_from_image_file(img_bytes)
        img_bytes.seek(0)
        payload["image_b64"] = base64.b64encode(img_bytes.read()).decode("utf-8")
    else:
        vec = embed_text(text_description).tolist()
        payload["has_image"] = False
        payload["tags"] = ""
    
    point = PointStruct(id=item_id, vector=vec, payload=payload)
    qclient.upsert(collection_name=COLLECTION, points=[point], wait=True)

    return f"Saved item id: {item_id}\nTags: {payload.get('tags','')}"

def search_items(query_image, query_text, limit: int = 5):
    if query_image:
        qvec = embed_image_pil(query_image).tolist()
    elif query_text:
        qvec = embed_text(query_text).tolist()
    else:
        return "Provide query image or text."

    hits = qclient.search(collection_name=COLLECTION, query_vector=qvec, limit=limit)
    if not hits:
        return "No results."

    results = []
    for h in hits:
        payload = h.payload or {}
        score = getattr(h, "score", 0)
        results.append(
            f"ID:{h.id}\nScore:{float(score):.4f}\nMode:{payload.get('mode','')}\n"
            f"Tags:{payload.get('tags','')}\nText:{payload.get('text','')}\n"
        )

    return "\n\n".join(results)

with gr.Blocks() as demo:
    gr.Markdown("## Lost & Found Helper")
    with gr.Row():
        with gr.Column():
            mode = gr.Radio(["lost", "found"], value="lost", label="Add as")
            upload_img = gr.Image(type="pil", label="Item photo (optional)")
            text_desc = gr.Textbox(lines=2, placeholder="Short description", label="Description")
            add_btn = gr.Button("Add item")
            add_out = gr.Textbox(interactive=False, label="Result")
        with gr.Column():
            query_img = gr.Image(type="pil", label="Search by image (optional)")
            query_text = gr.Textbox(lines=2, label="Search by text (optional)")
            search_btn = gr.Button("Search")
            search_out = gr.Textbox(interactive=False, label="Search results")

    add_btn.click(add_item, inputs=[mode, upload_img, text_desc], outputs=[add_out])
    search_btn.click(search_items, inputs=[query_img, query_text], outputs=[search_out])

if __name__ == "__main__":
    demo.launch(server_name="0.0.0.0", server_port=7860)