import streamlit as st
import math

def main():
    st.title("Ultimate Scientific Calculator")

    # User chooses between degrees and radians
    angle_mode = st.radio("Select Angle Mode:", ["Degrees", "Radians"], index=0)

    # Display supported operations
    st.markdown("""
    ## 🔹 Supported Operations:
    - **Addition (`+`)** → `5 + 3 = 8`
    - **Subtraction (`-`)** → `10 - 4 = 6`
    - **Multiplication (`*`)** → `7 * 2 = 14`
    - **Division (`/`)** → `8 / 2 = 4.0`
    - **Exponentiation (`**`)** → `3 ** 2 = 9`
    - **Modulus (`%`)** → `10 % 3 = 1`
    - **Floor Division (`//`)** → `10 // 3 = 3`
    - **Absolute Value (`abs(x)`)** → `abs(-5) = 5`
    - **Minimum (`min(x, y, ...)`)** → `min(3, 5, 2) = 2`
    - **Maximum (`max(x, y, ...)`)** → `max(3, 5, 2) = 5`
    - **Sine (`sin(x)`)** → `sin(45) ≈ 0.707` (if Degrees)
    - **Cosine (`cos(x)`)** → `cos(45) ≈ 0.707` (if Degrees)
    - **Tangent (`tan(x)`)** → `tan(45) ≈ 1` (if Degrees)
    - **Parentheses (`()`)** → Ensures correct order of operations → `(5 + 3) * 2 = 16`
    
    ⚠️ **Angle Mode:**
    - If **Degrees Mode is selected**, `sin(45)` is treated as `sin(45°)`.
    - If **Radians Mode is selected**, `sin(3.14)` is treated as `sin(3.14 radians)`.
    """)

    # User input for mathematical expression
    expression = st.text_input("Enter your mathematical expression:", "")

    if expression:
        try:
            # Convert angles to radians if needed
            def sin_angle(x):
                return math.sin(math.radians(x)) if angle_mode == "Degrees" else math.sin(x)

            def cos_angle(x):
                return math.cos(math.radians(x)) if angle_mode == "Degrees" else math.cos(x)

            def tan_angle(x):
                return math.tan(math.radians(x)) if angle_mode == "Degrees" else math.tan(x)

            # Safe evaluation using eval with restricted built-in functions
            result = eval(expression, {"__builtins__": None}, 
                          {"abs": abs, "min": min, "max": max, 
                           "sin": sin_angle, "cos": cos_angle, "tan": tan_angle})  
            
            st.success(f"Result: {result}")
        except Exception as e:
            st.error(f"Error in calculation: {e}")

if __name__ == "__main__":
    main()