src/streamlit_app.py

import streamlit as st
from huggingface_hub import InferenceClient
import requests
from PIL import Image
import tempfile
import os
import cv2
import numpy as np

# -----------------------------
# PAGE CONFIG
# -----------------------------
st.set_page_config(page_title="Cassava Disease Detection", layout="centered")

# -----------------------------
# CONFIGURATION
# -----------------------------
ROBOFLOW_API_KEY = st.secrets["ROBOFLOW_API_KEY"]
OPENROUTER_API_KEY = st.secrets["OPENROUTER_API_KEY"]
MODEL_ID = "cassavadisease/1"
ROBOFLOW_API_URL = "https://detect.roboflow.com"

# -----------------------------
# INITIALIZE HF INFERENCE CLIENT
# -----------------------------
hf_client = InferenceClient(token=OPENROUTER_API_KEY)

# -----------------------------
# FUNCTION: AI EXPLANATION
# -----------------------------
def get_ai_explanation(disease_name):
    prompt = f"""
    Explain briefly the cassava disease: {disease_name}.
    Include:
    - Cause
    - Main Symptoms
    - Prevention
    - Treatment
    Keep answer short.
    """
    response = hf_client.chat(model="minimax/minimax-m2.5", inputs=prompt)
    return response.get("generated_text") if "generated_text" in response else str(response)

# -----------------------------
# UI
# -----------------------------
st.title("Cassava Disease Detection Web App")
st.write("Upload or capture a cassava leaf image for disease detection.")

source = st.radio("Select Image Source:", ["Upload Image", "Use Camera"])
image = None

if source == "Upload Image":
    uploaded_file = st.file_uploader("Upload Image", type=["jpg", "jpeg", "png"])
    if uploaded_file:
        image = Image.open(uploaded_file)
elif source == "Use Camera":
    camera_photo = st.camera_input("Take a picture of the cassava leaf")
    if camera_photo:
        image = Image.open(camera_photo)

# -----------------------------
# MAIN PROCESS
# -----------------------------
if image is not None:
    st.image(image, caption="Captured Image", use_container_width=True)

    # Save temp image
    with tempfile.NamedTemporaryFile(delete=False, suffix=".jpg") as tmp:
        image.save(tmp.name)
        temp_path = tmp.name

    # -----------------------------
    # Roboflow inference (via requests)
    # -----------------------------
    with st.spinner("Analyzing image..."):
        headers = {"Authorization": f"Bearer {ROBOFLOW_API_KEY}"}
        files = {"file": open(temp_path, "rb")}
        response = requests.post(f"{ROBOFLOW_API_URL}/{MODEL_ID}", headers=headers, files=files)
        result = response.json()
    
    os.remove(temp_path)
    
    predictions = result.get("predictions", [])
    
    if predictions:
        img_cv = np.array(image)
        img_cv = cv2.cvtColor(img_cv, cv2.COLOR_RGB2BGR)

        for pred in predictions:
            x, y, w, h = pred["x"], pred["y"], pred["width"], pred["height"]
            label = pred["class"]
            confidence = round(pred["confidence"] * 100, 2)

            x1 = int(x - w / 2)
            y1 = int(y - h / 2)
            x2 = int(x + w / 2)
            y2 = int(y + h / 2)

            cv2.rectangle(img_cv, (x1, y1), (x2, y2), (0, 255, 0), 2)
            cv2.rectangle(img_cv, (x1, y1 - 30), (x1 + 250, y1), (0, 255, 0), -1)
            cv2.putText(img_cv, f"{label} ({confidence}%)", (x1 + 5, y1 - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.6, (0,0,0), 2)

        img_display = cv2.cvtColor(img_cv, cv2.COLOR_BGR2RGB)
        st.image(img_display, caption="Detected & Labeled Image", use_container_width=True)

        top_prediction = max(predictions, key=lambda x: x["confidence"])
        disease_name = top_prediction["class"]
        confidence = round(top_prediction["confidence"] * 100, 2)

        st.success(f"Detected: **{disease_name}**")
        st.info(f"Confidence: {confidence}%")

        with st.spinner("Generating disease explanation..."):
            explanation = get_ai_explanation(disease_name)
        st.markdown("## 📘 Disease Information")
        st.write(explanation)
    else:
        st.warning("No cassava leaf detected.")

# -----------------------------
# FOOTER
# -----------------------------
st.markdown("---")
st.markdown(
    "<div style='text-align: center; font-size: 14px;'>"
    "Developed by <b>Edcel Bogay</b>"
    "</div>",
    unsafe_allow_html=True
)