import gradio as gr
import math
import re

history = []

def calculate(expression):
    try:
        if not re.match(r'^[\d\s\+\-\*/\(\)\^\.\w]+$', expression):
            raise ValueError("Invalid characters in expression")
        
        expression = expression.replace('^', '**')
        safe_dict = {
            'sin': math.sin, 'cos': math.cos, 'tan': math.tan,
            'log': math.log10, 'ln': math.log, 'sqrt': math.sqrt,
            'pi': math.pi, 'e': math.e
        }
        result = eval(expression, {"__builtins__": None}, safe_dict)
        result_str = f"{result:.8f}".rstrip('0').rstrip('.')
        global history
        history.append(f"{expression} = {result_str}")
        history = history[-5:]
        return result_str, "\n".join(reversed(history))
    except Exception as e:
        return f"Error: {str(e)}", "\n".join(reversed(history))

def update_expression(expression, value):
    if expression == "0" and value not in ['.', '(', ')']:
        return value
    if value in ['sin', 'cos', 'tan', 'log', 'ln', 'sqrt']:
        return expression + value + '('
    return expression + value

def backspace(expression):
    return expression[:-1] if len(expression) > 0 else "0"

def clear(expression):
    return "0"

css = """
.calculator-display { font-family: 'Digital-7', 'Courier New', monospace; font-size: 24px; }
.calculator-button { font-family: 'Arial', sans-serif; font-size: 18px; }
.number-button { background-color: #e0e0e0; }
.basic-op-button { background-color: #ffffff; }
.advanced-op-button { background-color: #ffa500; }
.calculator-box { border: 1px solid #ccc; padding: 10px; margin: 5px; border-radius: 5px; }
"""

with gr.Blocks(css=css) as iface:
    gr.Markdown("# Scientific Calculator")
    
    with gr.Row():
        history_display = gr.Textbox(label="History (Last 5 Calculations)", lines=5)
    
    with gr.Row():
        display = gr.Textbox(value="0", label="Display", elem_classes=["calculator-display"])
    
    with gr.Row():
        with gr.Column(scale=3):
            with gr.Column(elem_classes=["calculator-box"]):
                # Number pad
                for i in range(3):
                    with gr.Row():
                        for j in range(3):
                            num = 7 - 3*i + j
                            globals()[f"btn_{num}"] = gr.Button(str(num), elem_classes=["calculator-button", "number-button"])
                with gr.Row():
                    btn_0 = gr.Button("0", elem_classes=["calculator-button", "number-button"])
                    btn_dot = gr.Button(".", elem_classes=["calculator-button", "number-button"])
                    btn_equals = gr.Button("=", elem_classes=["calculator-button", "basic-op-button"])
        
        with gr.Column(scale=2):
            with gr.Column(elem_classes=["calculator-box"]):
                # Basic operations
                for op, symbol in [("add", "+"), ("sub", "-"), ("mul", "*"), ("div", "/")]:
                    globals()[f"btn_{op}"] = gr.Button(symbol, elem_classes=["calculator-button", "basic-op-button"])
                btn_left_paren = gr.Button("(", elem_classes=["calculator-button", "basic-op-button"])
                btn_right_paren = gr.Button(")", elem_classes=["calculator-button", "basic-op-button"])
                btn_clear = gr.Button("C", elem_classes=["calculator-button", "basic-op-button"])
                btn_backspace = gr.Button("⌫", elem_classes=["calculator-button", "basic-op-button"])
        
        with gr.Column(scale=2):
            with gr.Column(elem_classes=["calculator-box"]):
                # Advanced operations
                for func in ["sin", "cos", "tan", "log", "ln", "sqrt"]:
                    globals()[f"btn_{func}"] = gr.Button(func, elem_classes=["calculator-button", "advanced-op-button"])
                btn_power = gr.Button("^", elem_classes=["calculator-button", "advanced-op-button"])
                btn_pi = gr.Button("π", elem_classes=["calculator-button", "advanced-op-button"])
                btn_e = gr.Button("e", elem_classes=["calculator-button", "advanced-op-button"])

    # Define button click events
    for btn in [btn_0, btn_1, btn_2, btn_3, btn_4, btn_5, btn_6, btn_7, btn_8, btn_9,
                btn_dot, btn_add, btn_sub, btn_mul, btn_div, btn_left_paren, btn_right_paren,
                btn_power, btn_sin, btn_cos, btn_tan, btn_log, btn_ln, btn_sqrt, btn_pi, btn_e]:
        btn.click(update_expression, inputs=[display, btn], outputs=display)

    btn_equals.click(calculate, inputs=display, outputs=[display, history_display])
    btn_clear.click(clear, inputs=display, outputs=display)
    btn_backspace.click(backspace, inputs=display, outputs=display)

iface.launch()