Upload app.py

app.py

@@ -0,0 +1,133 @@
+import streamlit as st
+import hashlib
+
+# Helper function to hash passwords
+def hash_password(password):
+    return hashlib.sha256(str.encode(password)).hexdigest()
+
+# Initialize session state for login and signup data
+if 'logged_in' not in st.session_state:
+    st.session_state['logged_in'] = False
+if 'users' not in st.session_state:
+    st.session_state['users'] = {}
+
+# Function to handle login
+def handle_login(username, password):
+    if username in st.session_state['users']:
+        hashed_password = hash_password(password)
+        if st.session_state['users'][username] == hashed_password:
+            st.session_state['logged_in'] = True
+            st.session_state['username'] = username
+            st.success(f"Successfully logged in as {username}")
+            st.rerun()  # Redirect to the main page
+        else:
+            st.error("Incorrect password")
+    else:
+        st.error("Username does not exist")
+
+# Function to handle logout
+def handle_logout():
+    st.session_state['logged_in'] = False
+    st.session_state['username'] = None
+    st.rerun()  # Rerun to show the login page
+
+# Signup functionality
+def handle_signup(username, password, confirm_password):
+    if username in st.session_state['users']:
+        st.error("Username already exists! Please choose another.")
+    elif password != confirm_password:
+        st.error("Passwords do not match!")
+    else:
+        st.session_state['users'][username] = hash_password(password)
+        st.success(f"User {username} successfully signed up! You can now log in.")
+
+def main_page():
+    st.title("Main Page")
+    st.write(f"Welcome, {st.session_state['username']}!")
+
+    # Create multiple tabs for different functionalities
+    tab1, tab2, tab3 = st.tabs(["Predict and Save in Blockchain", "Retrieve from Blockchain", "Logout"])
+
+   # Tab 1: Predict and Save in Blockchain
+    with tab1:
+        st.header("Predict and Save in Blockchain")
+
+        # Multiple input fields for crop data
+        nitrogen = st.number_input("Nitrogen (N) content in soil (mg/kg)", min_value=0, step=1)
+        phosphorus = st.number_input("Phosphorus (P) content in soil (mg/kg)", min_value=0, step=1)
+        potassium = st.number_input("Potassium (K) content in soil (mg/kg)", min_value=0, step=1)
+        soil_type = st.selectbox("Select Soil Type", ["Clay", "Loamy", "Sandy", "Silt"])
+        temperature = st.number_input("Temperature (°C)", min_value=-50.0, max_value=60.0, step=0.1)
+        rainfall = st.number_input("Rainfall (mm)", min_value=0.0, step=0.1)
+        humidity = st.number_input("Humidity (%)", min_value=0, max_value=100, step=1)
+        pH = st.number_input("Soil pH", min_value=0.0, max_value=14.0, step=0.1)
+
+        # Button to make predictions and save to blockchain
+        if st.button("Predict and Save"):
+            # Check if all required fields are filled
+            if nitrogen and phosphorus and potassium and temperature and rainfall and humidity and pH:
+                # Placeholder for prediction logic (can use a machine learning model here)
+                prediction_result = f"Best crop based on N: {nitrogen}, P: {phosphorus}, K: {potassium}, Soil Type: {soil_type}, Temp: {temperature}, Rainfall: {rainfall}, Humidity: {humidity}, pH: {pH}"
+                
+                # Display the prediction
+                st.success(prediction_result)
+                
+                # Save the prediction result to the blockchain (replace with actual blockchain logic)
+                st.session_state['blockchain'].add_block(prediction_result)
+                st.success("Prediction saved in the blockchain!")
+            else:
+                st.error("Please fill out all the fields!")
+
+
+    # Tab 2: Retrieve from Blockchain
+    with tab2:
+        st.header("Retrieve Data from Blockchain")
+        if st.button("Retrieve Blockchain Data"):
+            # Assuming blockchain retrieval logic here
+            st.success("Blockchain data retrieved!")
+            # Display blockchain data (assuming JSON format for simplicity)
+            st.json({"block_1": "Sample Data", "block_2": "More Data"})  # Example data
+
+    # Tab 3: Logout
+    with tab3:
+        st.header("Logout")
+        if st.button("Logout"):
+            handle_logout()
+
+# Define a simple logout function
+def handle_logout():
+    st.session_state['logged_in'] = False
+    st.rerun()  # Rerun to show the login page again
+
+
+# Login/signup interface
+def login_page():
+    st.title("Crop Recomendation")
+
+    # Tabs for login and signup
+    tab1, tab2 = st.tabs(["Login", "Signup"])
+
+    # Login Tab
+    with tab1:
+        st.header("Login")
+        login_username = st.text_input("Username", key="login_username")
+        login_password = st.text_input("Password", type="password", key="login_password")
+        
+        if st.button("Login"):
+            handle_login(login_username, login_password)
+
+    # Signup Tab
+    with tab2:
+        st.header("Signup")
+        signup_username = st.text_input("Create Username", key="signup_username")
+        signup_password = st.text_input("Create Password", type="password", key="signup_password")
+        signup_confirm_password = st.text_input("Confirm Password", type="password", key="signup_confirm_password")
+        
+        if st.button("Signup"):
+            handle_signup(signup_username, signup_password, signup_confirm_password)
+
+# Conditional display based on login state
+if st.session_state['logged_in']:
+    main_page()  # Show main page with logout
+else:
+    login_page()  # Show login/signup page