# app.py
import streamlit as st
import math

st.set_page_config(page_title="Enhanced Calculator", page_icon=":calculator:", layout="wide")

# Custom CSS for a more professional look
st.markdown(
    """
    <style>
    body {
        font-family: 'Arial', sans-serif; /* Modern font */
        background-color: #f4f4f4; /* Light background */
    }
    .calculator-container {
        border: 1px solid #ddd;
        padding: 20px;
        border-radius: 10px;
        box-shadow: 5px 5px 15px rgba(0, 0, 0, 0.1);
        background-color: white;
    }
    .input-group {
        margin-bottom: 15px;
    }
    .input-group label {
        font-weight: bold;
        margin-bottom: 5px;
    }
    .stButton>button {
        background-color: #007bff; /* Blue button */
        color: white;
        padding: 12px 20px;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        width: 100%; /* Full width button */
    }
    .stButton>button:hover {
        background-color: #0056b3; /* Darker blue on hover */
    }
    .result-area {
        margin-top: 20px;
        padding: 15px;
        border: 1px solid #ddd;
        border-radius: 5px;
        background-color: #f9f9f9;
        font-size: 1.2em;
        font-weight: bold;
    }
    .error-message {
        color: red;
        margin-top: 10px;
    }
    </style>
    """,
    unsafe_allow_html=True,
)

st.title("Enhanced Calculator")

with st.container() as calculator_container:  # Enclose in a container for styling

    col1, col2 = st.columns([1, 1])  # Two columns for inputs and operations

    with col1:
        st.subheader("Input Numbers")
        num1 = st.number_input("First Number", value=0.0)
        num2 = st.number_input("Second Number", value=0.0)
        num3 = st.number_input("Third Number", value=0.0)

    with col2:
        st.subheader("Select Operation")
        operation = st.selectbox(
            "Operation",
            [
                "+", "-", "*", "/", "Power", "Square Root", "Cube Root", "Average",
                "Logarithm",  # Added Logarithm
                "Sin", "Cos", "Tan",  # Added Trigonometric functions
                "Absolute Value", #Added Absolute Value function
                "Factorial" #Added Factorial function
            ],
        )

    if st.button("Calculate"):
        try:
            if operation == "+":
                result = num1 + num2 + num3
            elif operation == "-":
                result = num1 - num2 - num3
            elif operation == "*":
                result = num1 * num2 * num3
            elif operation == "/":
                if num2 == 0 or num3 == 0:
                    raise ZeroDivisionError("Division by zero is not allowed.")
                else:
                    result = num1 / num2 / num3
            elif operation == "Power":
                result = num1**num2
            elif operation == "Square Root":
                if num1 < 0:
                    raise ValueError("Square root of a negative number is not allowed.")
                else:
                    result = math.sqrt(num1)
            elif operation == "Cube Root":
                result = num1**(1/3)
            elif operation == "Average":
                result = (num1 + num2 + num3) / 3
            elif operation == "Logarithm":
                if num1 <= 0:
                    raise ValueError("Logarithm of a non-positive number is not allowed.")
                else:
                    result = math.log(num1)
            elif operation == "Sin":
                result = math.sin(math.radians(num1)) # Convert to radians
            elif operation == "Cos":
                result = math.cos(math.radians(num1)) # Convert to radians
            elif operation == "Tan":
                result = math.tan(math.radians(num1)) # Convert to radians
            elif operation == "Absolute Value":
                result = abs(num1)
            elif operation == "Factorial":
                if num1 < 0 or not num1.is_integer():
                    raise ValueError("Factorial is only defined for non-negative integers.")
                else:
                     result = math.factorial(int(num1))

            st.markdown(f"<div class='result-area'>Result: {result}</div>", unsafe_allow_html=True)

        except (ZeroDivisionError, ValueError) as e:
            st.markdown(f"<div class='error-message'>{str(e)}</div>", unsafe_allow_html=True)
        except Exception as e:
            st.markdown(f"<div class='error-message'>An error occurred: {e}</div>", unsafe_allow_html=True)


st.markdown("---")
st.write("Made with Streamlit")