import streamlit as st
import numpy as np

# Title of the app
st.title("Scientific Calculator")

# Input field for numbers
num1 = st.number_input("Enter a number", value=0.0, format="%.5f")

# Scientific operations
operation = st.selectbox("Select Operation", [
    "Addition", "Subtraction", "Multiplication", "Division",
    "Square", "Square Root", "Power", "Logarithm", "Exponential",
    "Sine", "Cosine", "Tangent", "Factorial"
])

# Additional input if required
num2 = None
if operation in ["Addition", "Subtraction", "Multiplication", "Division", "Power"]:
    num2 = st.number_input("Enter second number", value=0.0, format="%.5f")

# Perform Calculation
result = None
if st.button("Calculate"):
    try:
        if operation == "Addition":
            result = num1 + num2
        elif operation == "Subtraction":
            result = num1 - num2
        elif operation == "Multiplication":
            result = num1 * num2
        elif operation == "Division":
            if num2 != 0:
                result = num1 / num2
            else:
                st.error("Error: Division by zero is not allowed!")
        elif operation == "Square":
            result = num1 ** 2
        elif operation == "Square Root":
            if num1 >= 0:
                result = np.sqrt(num1)
            else:
                st.error("Error: Square root of a negative number is not allowed!")
        elif operation == "Power":
            result = num1 ** num2
        elif operation == "Logarithm":
            if num1 > 0:
                result = np.log(num1)
            else:
                st.error("Error: Logarithm of zero or a negative number is not allowed!")
        elif operation == "Exponential":
            result = np.exp(num1)
        elif operation == "Sine":
            result = np.sin(np.radians(num1))
        elif operation == "Cosine":
            result = np.cos(np.radians(num1))
        elif operation == "Tangent":
            result = np.tan(np.radians(num1))
        elif operation == "Factorial":
            if num1 >= 0 and num1 == int(num1):
                result = np.math.factorial(int(num1))
            else:
                st.error("Error: Factorial is only defined for non-negative integers!")
    except Exception as e:
        st.error(f"Error: {e}")

# Display Result
if result is not None:
    st.success(f"Result: {result}")