import streamlit as st
import numpy as np
import sympy as sp
import math

# Define calculator operations
def calculate(expression):
    try:
        # Evaluate the expression safely
        result = eval(expression, {"__builtins__": None}, {
            "sin": math.sin, "cos": math.cos, "tan": math.tan,
            "asin": math.asin, "acos": math.acos, "atan": math.atan,
            "sinh": math.sinh, "cosh": math.cosh, "tanh": math.tanh,
            "log": math.log, "ln": math.log, "sqrt": math.sqrt,
            "pi": math.pi, "e": math.e, "pow": math.pow,
            "abs": abs, "factorial": math.factorial, 
            "radians": math.radians, "degrees": math.degrees
        })
        return result
    except Exception as e:
        return f"Error: {str(e)}"

# Streamlit app UI
st.title("Scientific Calculator")

# User input for mathematical expression
input_expression = st.text_input("Enter Expression:", value="", placeholder="e.g., sin(pi/4) + log(10)")

# Buttons grid similar to the calculator image
buttons = [
    ["7", "8", "9", "/", "AC"],
    ["4", "5", "6", "*", "π"],
    ["1", "2", "3", "-", "e"],
    ["0", ".", "=", "+", "^"],
    ["sin", "cos", "tan", "log", "ln"],
    ["sqrt", "(", ")", "!", "deg→rad"]
]

# Store the current expression
if "expression" not in st.session_state:
    st.session_state.expression = ""

# Display buttons in a grid
for row in buttons:
    cols = st.columns(len(row))
    for i, button in enumerate(row):
        if cols[i].button(button):
            if button == "=":
                # Calculate the result
                st.session_state.expression = str(calculate(st.session_state.expression))
            elif button == "AC":
                # Clear the input
                st.session_state.expression = ""
            elif button == "π":
                st.session_state.expression += "pi"
            elif button == "e":
                st.session_state.expression += "e"
            elif button == "deg→rad":
                st.session_state.expression += "*pi/180"
            elif button == "!":
                st.session_state.expression += "!"
            else:
                st.session_state.expression += button

# Display the current expression
st.text_input("Expression", st.session_state.expression, key="display", disabled=True)