import streamlit as st
import sqlite3

def get_system_instruction(username):
    conn = sqlite3.connect('users.db')
    c = conn.cursor()
    c.execute('SELECT instruction FROM system_instructions WHERE username=?', (username,))
    instruction = c.fetchone()
    conn.close()
    if instruction:
        return instruction[0]
    else:
        return "Default system instruction."

def save_system_instruction(username, instruction):
    conn = sqlite3.connect('users.db')
    c = conn.cursor()
    c.execute('SELECT * FROM system_instructions WHERE username=?', (username,))
    existing_instruction = c.fetchone()
    if existing_instruction:
        c.execute('UPDATE system_instructions SET instruction=? WHERE username=?', (instruction, username))
    else:
        c.execute('INSERT INTO system_instructions(username, instruction) VALUES (?,?)', (username, instruction))
    conn.commit()
    conn.close()

def show_settings():
    st.subheader("Settings")
    username = st.session_state["username"]
    system_instruction = get_system_instruction(username)
    st.write("System Instruction:")
    instruction = st.text_area("", value=system_instruction, height=200)
    if st.button("Save Changes"):
        save_system_instruction(username, instruction)
        st.success("System instruction saved successfully.")

    st.write("Note: System instruction is not used in this version of the app.")

if st.session_state["authenticated"]:
    show_settings()   
else:
    if not st.session_state["is_starting"]:
        st.write("You are not authenticated. Please log in to access this page.")