import streamlit as st
import math

# Title of the application
st.title('Advanced Calculator')

# Sidebar for choosing operation
operation = st.sidebar.selectbox(
    "Choose operation",
    ("Basic", "Advanced", "Trigonometric", "Logarithmic", "Factorial", "Percentage", "Memory")
)

# User input for numbers
num1 = st.number_input('Enter first number', value=0.0)
num2 = st.number_input('Enter second number (optional)', value=0.0)

# Memory variable (to store previous result)
if 'memory' not in st.session_state:
    st.session_state.memory = 0.0

# Basic Operations
if operation == "Basic":
    basic_op = st.selectbox("Choose basic operation", ("Add", "Subtract", "Multiply", "Divide"))
    if basic_op == "Add":
        result = num1 + num2
    elif basic_op == "Subtract":
        result = num1 - num2
    elif basic_op == "Multiply":
        result = num1 * num2
    elif basic_op == "Divide":
        if num2 != 0:
            result = num1 / num2
        else:
            result = "Error: Division by Zero"

# Advanced Operations
elif operation == "Advanced":
    advanced_op = st.selectbox("Choose advanced operation", ("Power", "Square Root"))
    if advanced_op == "Power":
        result = num1 ** num2
    elif advanced_op == "Square Root":
        if num1 >= 0:
            result = math.sqrt(num1)
        else:
            result = "Error: Cannot take square root of negative number"

# Trigonometric Operations
elif operation == "Trigonometric":
    trig_op = st.selectbox("Choose trigonometric function", ("Sine", "Cosine", "Tangent"))
    angle_in_degrees = st.checkbox("Use degrees instead of radians?")
    
    if trig_op == "Sine":
        if angle_in_degrees:
            result = math.sin(math.radians(num1))
        else:
            result = math.sin(num1)
    elif trig_op == "Cosine":
        if angle_in_degrees:
            result = math.cos(math.radians(num1))
        else:
            result = math.cos(num1)
    elif trig_op == "Tangent":
        if angle_in_degrees:
            result = math.tan(math.radians(num1))
        else:
            result = math.tan(num1)

# Logarithmic Operations
elif operation == "Logarithmic":
    log_op = st.selectbox("Choose logarithmic operation", ("Log Base 10", "Natural Log"))
    if log_op == "Log Base 10":
        if num1 > 0:
            result = math.log10(num1)
        else:
            result = "Error: Logarithm only defined for positive numbers"
    elif log_op == "Natural Log":
        if num1 > 0:
            result = math.log(num1)
        else:
            result = "Error: Logarithm only defined for positive numbers"

# Factorial
elif operation == "Factorial":
    if num1 >= 0 and num1 == int(num1):
        result = math.factorial(int(num1))
    else:
        result = "Error: Factorial is only defined for non-negative integers"

# Percentage Calculation
elif operation == "Percentage":
    percentage_op = st.selectbox("Choose percentage operation", ("Find Percentage", "Find Percentage of"))
    if percentage_op == "Find Percentage":
        result = (num1 * num2) / 100
    elif percentage_op == "Find Percentage of":
        result = (num1 * 100) / num2

# Memory Feature
elif operation == "Memory":
    memory_op = st.selectbox("Choose memory operation", ("Store Result", "Recall Result", "Clear Memory"))
    if memory_op == "Store Result":
        st.session_state.memory = result
        result = f"Result stored in memory: {st.session_state.memory}"
    elif memory_op == "Recall Result":
        result = f"Memory contains: {st.session_state.memory}"
    elif memory_op == "Clear Memory":
        st.session_state.memory = 0.0
        result = "Memory cleared"

# Display the result
st.write(f"Result: {result}")