import os
from langgraph.graph import StateGraph, START, END
from IPython.display import Image, display

# Assuming 'agents' module and its contents (AgentState, nodes, routes) are available.
# For a runnable example, you'd need to define these or mock them.
# Example placeholders if 'agents.py' isn't provided:
class AgentState:
    """A placeholder for AgentState."""
    pass

def analyze_intent_node(state):
    """Placeholder for analyze_intent_node."""
    print("Analyzing intent...")
    # In a real scenario, this would determine the next step
    # For demonstration, let's simulate routing to visualization
    return {"next_step": "visualization"}

def generate_visualization_node(state):
    """Placeholder for generate_visualization_node."""
    print("Generating visualization code...")
    # Simulate success
    return {"code_generated": True}

def generate_transformation_node(state):
    """Placeholder for generate_transformation_node."""
    print("Generating transformation code...")
    return {"code_generated": True}

def generate_statistical_node(state):
    """Placeholder for generate_statistical_node."""
    print("Generating statistical code...")
    return {"code_generated": True}

def execute_code_node(state):
    """Placeholder for execute_code_node."""
    print("Executing code...")
    return {"execution_successful": True}

def error_handler_node(state):
    """Placeholder for error_handler_node."""
    print("Handling error...")
    return {}

def route_based_on_intent(state):
    """Placeholder for route_based_on_intent."""
    # In a real app, this would use state to determine the route
    if state.get("next_step") == "visualization":
        return "visualization"
    elif state.get("next_step") == "transformation":
        return "transformation"
    elif state.get("next_step") == "statistical":
        return "statistical"
    return "error"

def route_to_execution(state):
    """Placeholder for route_to_execution."""
    # In a real app, this would check if code generation was successful
    if state.get("code_generated"):
        return "execute"
    return "error"


def create_visualization():
    """Create and save a visualization of the agent workflow."""
    # Create the state graph
    workflow = StateGraph(AgentState)
    
    # Add nodes
    workflow.add_node("analyze_intent", analyze_intent_node)
    workflow.add_node("visualization", generate_visualization_node)
    workflow.add_node("transformation", generate_transformation_node)
    workflow.add_node("statistical", generate_statistical_node)
    workflow.add_node("execute", execute_code_node)
    workflow.add_node("error_handler", error_handler_node)
    
    # Add edges
    workflow.add_edge(START, "analyze_intent")
    
    # Conditional edges based on intent
    workflow.add_conditional_edges(
        "analyze_intent",
        route_based_on_intent,
        {
            "visualization": "visualization",
            "transformation": "transformation", 
            "statistical": "statistical",
            "error": "error_handler"
        }
    )
    
    # Route from generation nodes to execution
    workflow.add_conditional_edges(
        "visualization",
        route_to_execution,
        {
            "execute": "execute",
            "complete": END, # Added 'complete' to allow direct END from visualization if needed
            "error": "error_handler"
        }
    )
    workflow.add_conditional_edges(
        "transformation",
        route_to_execution,
        {
            "execute": "execute",
            "complete": END,
            "error": "error_handler"
        }
    )
    workflow.add_conditional_edges(
        "statistical",
        route_to_execution,
        {
            "execute": "execute",
            "complete": END,
            "error": "error_handler"
        }
    )
    
    # Final edges
    workflow.add_edge("execute", END)
    workflow.add_edge("error_handler", END)
    
    # Create visualization directory if it doesn't exist
    os.makedirs("visualizations", exist_ok=True)
    
    # Generate and save the visualization
    graph = workflow.compile()
    
    try:
        # Get the graph as a Mermaid diagram and draw it to PNG
        # This requires 'mermaid-py' and potentially 'puppeteer' (for playwright backend)
        png_data = graph.get_graph().draw_mermaid_png()

        # Define the filename
        filename = os.path.join("visualizations", "mermaid_graph.png")

        # Save the PNG data to a file
        with open(filename, "wb") as f:
            f.write(png_data)

        print(f"Image successfully saved as '{filename}'")

        # Optionally, display the image after saving
        display(Image(png_data))
    except ImportError:
        print("Please install 'mermaid-py' to generate PNG visualizations.")
        print("You might also need to install a browser automation tool like 'playwright' for mermaid-py.")
    except Exception as e:
        print(f"An error occurred during visualization: {e}")
        # This requires some extra dependencies and is optional
        pass

if __name__ == "__main__":
    create_visualization()