import gradio as gr
import os
import re
from openai import OpenAI
import time

# Function to generate math solution using the Phi-4-reasoning-plus model
def generate_math_solution(api_key, problem_text, history=None):
    if not api_key.strip():
        return "Please enter your OpenRouter API key.", history
    
    if not problem_text.strip():
        return "Please enter a math problem.", history
    
    try:
        client = OpenAI(
            base_url="https://openrouter.ai/api/v1",
            api_key=api_key,
        )
        
        messages = [
            {"role": "system", "content": 
             """You are an expert math tutor who explains concepts clearly and thoroughly.
             Analyze the given math problem and provide a detailed step-by-step solution.
             For each step:
             1. Show the mathematical operation
             2. Explain why this step is necessary
             3. Connect it to relevant mathematical concepts
             
             Format your response with clear section headers using markdown.
             Begin with an "Initial Analysis" section, follow with numbered steps,
             and conclude with a "Final Answer" section."""},
        ]
        
        # Add conversation history if it exists
        if history:
            for exchange in history:
                messages.append({"role": "user", "content": exchange[0]})
                if exchange[1]:  # Check if there's a response
                    messages.append({"role": "assistant", "content": exchange[1]})
        
        # Add the current problem
        messages.append({"role": "user", "content": f"Solve this math problem step-by-step: {problem_text}"})
        
        # Create the completion
        completion = client.chat.completions.create(
            model="microsoft/phi-4-reasoning-plus:free",
            messages=messages,
            extra_headers={
                "HTTP-Referer": "https://advancedmathtutor.edu",
                "X-Title": "Advanced Math Tutor",
            }
        )
        
        solution = completion.choices[0].message.content
        
        # Update history
        if history is None:
            history = []
        history.append((problem_text, solution))
        
        return solution, history
        
    except Exception as e:
        error_message = f"Error: {str(e)}"
        return error_message, history

# Function to verify API key format
def validate_api_key(api_key):
    # This is a simple check - OpenRouter keys typically start with "sk-or-"
    if api_key.startswith("sk-or-") and len(api_key) > 20:
        return True
    return False

# Function to process LaTeX in the solution
def process_solution(solution):
    # Replace $...$ with $$...$$ for better rendering in Gradio markdown
    solution = re.sub(r'(?<!\$)\$(?!\$)(.+?)(?<!\$)\$(?!\$)', r'$$\1$$', solution)
    return solution

# Define the Gradio interface
def create_demo():
    with gr.Blocks(theme=gr.themes.Soft(primary_hue="blue")) as demo:
        gr.Markdown("# 📚 Advanced Math Tutor")
        gr.Markdown("""
        This application uses Microsoft's Phi-4-reasoning-plus model to provide step-by-step solutions 
        to math problems. Enter your math problem, and get a detailed explanation with clear reasoning steps.
        """)
        
        # Main tabs
        with gr.Tabs():
            with gr.TabItem("Problem Solver"):
                with gr.Row():
                    with gr.Column(scale=1):
                        api_key_input = gr.Textbox(
                            label="OpenRouter API Key", 
                            placeholder="Enter your OpenRouter API key (starts with sk-or-)",
                            type="password"
                        )
                        problem_input = gr.Textbox(
                            label="Math Problem", 
                            placeholder="Enter your math problem here...",
                            lines=5
                        )
                        example_problems = gr.Examples(
                            examples=[
                                ["Solve the quadratic equation: 3x² + 5x - 2 = 0"],
                                ["Find the derivative of f(x) = x³ln(x)"],
                                ["Calculate the area of a circle with radius 5 cm"],
                                ["Find all values of x that satisfy the equation: log₂(x-1) + log₂(x+3) = 5"]
                            ],
                            inputs=[problem_input],
                            label="Example Problems"
                        )
                        with gr.Row():
                            submit_btn = gr.Button("Solve Problem", variant="primary")
                            clear_btn = gr.Button("Clear")
                    
                with gr.Column(scale=2):
                    solution_output = gr.Markdown(label="Solution")
                
                # Store conversation history (invisible to user)
                conversation_history = gr.State(value=None)
                
                # Button actions
                submit_btn.click(
                    fn=generate_math_solution,
                    inputs=[api_key_input, problem_input, conversation_history],
                    outputs=[solution_output, conversation_history]
                )
                
                clear_btn.click(
                    fn=lambda: ("", None),
                    inputs=[],
                    outputs=[solution_output, conversation_history]
                )
            
            with gr.TabItem("Help"):
                gr.Markdown("""
                ## How to Use the Advanced Math Tutor
                
                ### Getting Started
                1. You'll need an API key from OpenRouter to use this app
                2. Sign up at [OpenRouter](https://openrouter.ai/) to get your API key
                3. Enter your API key in the designated field
                
                ### Solving Math Problems
                - Type or paste your math problem in the input field
                - Click "Solve Problem" to get a detailed step-by-step solution
                - The solution will include explanations for each step
                - You can also try one of the provided example problems
                
                ### Tips for Best Results
                - Be specific in your problem description
                - Include all necessary information
                - For complex equations, use clear notation
                - For algebraic expressions, use ^ for exponents (e.g., x^2 for x²)
                - Use parentheses to group terms clearly
                
                ### Types of Problems You Can Solve
                - Algebra (equations, inequalities, systems of equations)
                - Calculus (derivatives, integrals, limits)
                - Trigonometry
                - Geometry
                - Statistics and Probability
                - Number Theory
                - And many more!
                """)
        
        # Footer
        gr.Markdown("""
        ---
        ### About
        This application uses Microsoft's Phi-4-reasoning-plus model via OpenRouter to generate step-by-step solutions. 
        Your API key is required but not stored permanently.
        """)
    
    return demo

# Launch the app
if __name__ == "__main__":
    demo = create_demo()
    demo.launch()