app.py

import gradio as gr
from roboflow import Roboflow
import cv2
import numpy as np
import tempfile
import os

# ----------------------------
# Roboflow setup
# ----------------------------
API_KEY = "DIAhXQf6AUsyM1PRfdFa"  # Replace with your API key if needed
PROJECT_NAME = "garbage-detection-pbcjq"
VERSION_NUMBER = 7

rf = Roboflow(api_key=API_KEY)
project = rf.workspace().project(PROJECT_NAME)
model = project.version(VERSION_NUMBER).model

# ----------------------------
# Image prediction function
# ----------------------------
def predict_image(image):
    """
    Accepts a PIL image or NumPy array, returns image with bounding boxes.
    """
    temp_file = tempfile.NamedTemporaryFile(delete=False, suffix=".jpg")
    cv2.imwrite(temp_file.name, cv2.cvtColor(np.array(image), cv2.COLOR_RGB2BGR))

    # Make prediction
    result = model.predict(temp_file.name).json()
    img = np.array(image).copy()

    # Draw bounding boxes
    for pred in result.get("predictions", []):
        x1, y1, w, h = pred["x"], pred["y"], pred["width"], pred["height"]
        x2, y2 = x1 + w, y1 + h
        label = f"{pred['class']} {pred['confidence']:.2f}"
        cv2.rectangle(img, (int(x1), int(y1)), (int(x2), int(y2)), (0, 255, 0), 2)
        cv2.putText(img, label, (int(x1), int(y1)-10), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0), 2)

    os.unlink(temp_file.name)
    return img

# ----------------------------
# Video prediction function
# ----------------------------
def predict_video(video_file):
    """
    Accepts a video file path, returns path to video with bounding boxes.
    """
    temp_output = tempfile.NamedTemporaryFile(delete=False, suffix=".mp4").name
    cap = cv2.VideoCapture(video_file)
    fourcc = cv2.VideoWriter_fourcc(*'mp4v')
    fps = int(cap.get(cv2.CAP_PROP_FPS))
    width  = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
    height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
    out = cv2.VideoWriter(temp_output, fourcc, fps, (width, height))

    while True:
        ret, frame = cap.read()
        if not ret:
            break

        # Save frame temporarily
        temp_frame_file = tempfile.NamedTemporaryFile(delete=False, suffix=".jpg").name
        cv2.imwrite(temp_frame_file, frame)
        result = model.predict(temp_frame_file).json()
        os.unlink(temp_frame_file)

        # Draw bounding boxes
        for pred in result.get("predictions", []):
            x1, y1, w, h = pred["x"], pred["y"], pred["width"], pred["height"]
            x2, y2 = x1 + w, y1 + h
            label = f"{pred['class']} {pred['confidence']:.2f}"
            cv2.rectangle(frame, (int(x1), int(y1)), (int(x2), int(y2)), (0, 255, 0), 2)
            cv2.putText(frame, label, (int(x1), int(y1)-10), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0), 2)

        out.write(frame)

    cap.release()
    out.release()
    return temp_output

# ----------------------------
# Gradio Interface
# ----------------------------
with gr.Blocks() as demo:
    gr.Markdown("## 🗑 Garbage Detection App (Image & Video)")
    gr.Markdown("Upload an image or video to detect objects using Roboflow.")

    with gr.Tabs():
        with gr.Tab("Image"):
            image_input = gr.Image(type="pil")
            image_output = gr.Image()
            image_button = gr.Button("Predict Image")
            image_button.click(predict_image, inputs=image_input, outputs=image_output)

        with gr.Tab("Video"):
            video_input = gr.Video()
            video_output = gr.Video()
            video_button = gr.Button("Predict Video")
            video_button.click(predict_video, inputs=video_input, outputs=video_output)

demo.launch()