import gradio as gr
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
from peft import PeftModel
from monitoring import PerformanceMonitor, measure_time

# Model configurations
BASE_MODEL = "HuggingFaceTB/SmolLM2-1.7B-Instruct"  # Base model
ADAPTER_MODEL = "Joash2024/Math-SmolLM2-1.7B"       # Our LoRA adapter

# Initialize performance monitor
monitor = PerformanceMonitor()

print("Loading tokenizer...")
tokenizer = AutoTokenizer.from_pretrained(BASE_MODEL)
tokenizer.pad_token = tokenizer.eos_token

print("Loading base model...")
model = AutoModelForCausalLM.from_pretrained(
    BASE_MODEL,
    device_map="auto",
    torch_dtype=torch.float16
)

print("Loading LoRA adapter...")
model = PeftModel.from_pretrained(model, ADAPTER_MODEL)
model.eval()

def format_prompt(problem: str, problem_type: str) -> str:
    """Format input prompt for the model"""
    if problem_type == "Derivative":
        return f"""Given a mathematical function, find its derivative.

Function: {problem}
The derivative of this function is:"""
    elif problem_type == "Addition":
        return f"""Solve this addition problem.

Problem: {problem}
The solution is:"""
    else:  # Roots or Custom
        return f"""Find the derivative of this function.

Function: {problem}
The derivative is:"""

@measure_time
def generate_derivative(problem: str, problem_type: str, max_length: int = 200) -> str:
    """Generate derivative for a given function"""
    # Format the prompt
    prompt = format_prompt(problem, problem_type)
    
    # Tokenize
    inputs = tokenizer(prompt, return_tensors="pt").to(model.device)
    
    # Generate
    with torch.no_grad():
        outputs = model.generate(
            **inputs,
            max_length=max_length,
            num_return_sequences=1,
            temperature=0.1,
            do_sample=True,
            pad_token_id=tokenizer.eos_token_id
        )
    
    # Decode and extract derivative
    generated = tokenizer.decode(outputs[0], skip_special_tokens=True)
    derivative = generated[len(prompt):].strip()
    
    return derivative

def solve_problem(problem: str, problem_type: str) -> tuple:
    """Solve problem and format output"""
    if not problem:
        return "Please enter a problem", None
    
    # Record problem type
    monitor.record_problem_type(problem_type)
    
    # Generate solution
    print(f"\nGenerating solution for: {problem}")
    solution, time_taken = generate_derivative(problem, problem_type)
    
    # Record metrics
    monitor.record_response_time("model", time_taken)
    monitor.record_success("model", not solution.startswith("Error"))
    
    # Format output with step-by-step explanation
    output = f"""Generated solution: {solution}

Let's verify this step by step:
1. Starting with f(x) = {problem}
2. Applying differentiation rules
3. We get f'(x) = {solution}"""
    
    # Get updated statistics
    stats = monitor.get_statistics()
    
    # Format statistics for display
    stats_display = f"""
### Performance Metrics

#### Response Times
- Average: {stats.get('model_avg_response_time', 0):.2f} seconds

#### Success Rate
- {stats.get('model_success_rate', 0):.1f}%

#### Problem Types Used
"""
    for ptype, percentage in stats.get('problem_type_distribution', {}).items():
        stats_display += f"- {ptype}: {percentage:.1f}%\n"
    
    return output, stats_display

# Create Gradio interface
with gr.Blocks(title="Mathematics Problem Solver") as demo:
    gr.Markdown("# Mathematics Problem Solver")
    gr.Markdown("Using our fine-tuned model to solve mathematical problems")
    
    with gr.Row():
        with gr.Column():
            problem_type = gr.Dropdown(
                choices=["Addition", "Root Finding", "Derivative", "Custom"],
                value="Derivative",
                label="Problem Type"
            )
            problem_input = gr.Textbox(
                label="Enter your problem",
                placeholder="Example: x^2 + 3x"
            )
            solve_btn = gr.Button("Solve", variant="primary")
    
    with gr.Row():
        solution_output = gr.Textbox(
            label="Solution with Steps",
            lines=6
        )
    
    # Performance metrics display
    with gr.Row():
        metrics_display = gr.Markdown("### Performance Metrics\n*Solve a problem to see metrics*")
    
    # Example problems
    gr.Examples(
        examples=[
            ["x^2 + 3x", "Derivative"],
            ["144", "Root Finding"],
            ["235 + 567", "Addition"],
            ["\\sin{\\left(x\\right)}", "Derivative"],
            ["e^x", "Derivative"],
            ["\\frac{1}{x}", "Derivative"],
            ["x^3 + 2x", "Derivative"],
            ["\\cos{\\left(x^2\\right)}", "Derivative"]
        ],
        inputs=[problem_input, problem_type],
        outputs=[solution_output, metrics_display],
        fn=solve_problem,
        cache_examples=True,
    )
    
    # Connect the interface
    solve_btn.click(
        fn=solve_problem,
        inputs=[problem_input, problem_type],
        outputs=[solution_output, metrics_display]
    )

if __name__ == "__main__":
    demo.launch()