"""Tool definitions and utility functions for the agent"""
from typing import List, Dict, Any
import os
from dotenv import load_dotenv

from llama_index.core.tools import BaseTool, FunctionTool
from llama_index.readers.wikipedia import WikipediaReader
from llama_index.readers.web import SimpleWebPageReader
from llama_index.core.schema import Document

import wikipedia

# Load environment variables
load_dotenv()

# --- Text Processing Tools ---
def text_reverser(text: str) -> str:
    """
    Reverse the given text. Useful for answering questions that are written backwards.
    
    Args:
        text: The text to reverse
    
    Returns:
        The reversed text
    """
    return text[::-1]

# --- Math Tools ---
def simple_calculator(operation: str, a: float, b: float) -> float:
    """
    Perform a simple calculation.
    
    Args:
        operation: One of 'add', 'subtract', 'multiply', 'divide'
        a: First number
        b: Second number
    
    Returns:
        The result of the calculation
    """
    if operation == "add":
        return a + b
    elif operation == "subtract":
        return a - b
    elif operation == "multiply":
        return a * b
    elif operation == "divide":
        if b == 0:
            raise ValueError("Cannot divide by zero")
        return a / b
    else:
        raise ValueError(f"Unknown operation: {operation}")

# --- Information Retrieval Tools ---
def wikipedia_search(query: str, num_results: int = 2) -> str:
    """
    Search Wikipedia for information.
    
    Args:
        query: The search query
        num_results: Number of results to return (default: 2)
    
    Returns:
        A formatted string with the search results
    """
    try:
        # First try with LlamaIndex WikipediaReader
        reader = WikipediaReader()
        docs = reader.load_data(query=query, max_docs=num_results)
        if docs:
            results = []
            for i, doc in enumerate(docs, 1):
                title = doc.metadata.get("title", "Unknown Title")
                content = doc.text[:1000] + "..." if len(doc.text) > 1000 else doc.text
                results.append(f"Result {i}: {title}\n{content}\n")
            
            return "\n".join(results)
        else:
            # If no results from LlamaIndex, try with direct Wikipedia package
            print(f"No results from LlamaIndex WikipediaReader for '{query}', trying direct Wikipedia package...")
            return _fallback_wikipedia_search(query, num_results)
            
    except Exception as e:
        print(f"Error with LlamaIndex WikipediaReader: {str(e)}")
        # Fall back to direct Wikipedia package
        print(f"Falling back to direct Wikipedia package...")
        try:
            return _fallback_wikipedia_search(query, num_results)
        except Exception as fallback_error:
            print(f"Fallback also failed: {fallback_error}")
            return f"Error searching Wikipedia: Unable to retrieve information about '{query}'. Please try a different search term or approach."

def _fallback_wikipedia_search(query: str, num_results: int = 2) -> str:
    """
    Fallback implementation using the direct Wikipedia package.
    """
    # First search for pages
    search_results = wikipedia.search(query, results=num_results)
    
    if not search_results:
        return f"No Wikipedia results found for '{query}'."
    
    results = []
    for i, page_title in enumerate(search_results, 1):
        try:
            # Get the page content
            page = wikipedia.page(page_title)
            title = page.title
            # Get a summary instead of full content
            content = page.summary[:1000] + "..." if len(page.summary) > 1000 else page.summary
            results.append(f"Result {i}: {title}\n{content}\n")
        except wikipedia.exceptions.DisambiguationError as e:
            # Handle disambiguation pages
            options = e.options[:5]  # Limit to 5 options
            results.append(f"Result {i}: Multiple options found for '{page_title}':\n" + 
                          "\n".join([f"- {opt}" for opt in options]))
        except wikipedia.exceptions.PageError:
            # Skip pages that don't exist
            continue
        except Exception as e:
            results.append(f"Result {i}: Error retrieving information for '{page_title}': {str(e)}")
    
    if not results:
        return f"Could not retrieve valid information for '{query}'."
    
    return "\n".join(results)

def web_search(url: str) -> str:
    """
    Fetch and extract content from a specific web page.
    
    Args:
        url: The URL of the web page to search
    
    Returns:
        The extracted content from the web page
    """
    try:
        reader = SimpleWebPageReader()
        docs = reader.load_data(urls=[url])
        if not docs:
            return f"No content found for URL: {url}"
        
        # Just return the content of the first document
        return docs[0].text
    except Exception as e:
        return f"Error retrieving web page: {str(e)}"

# --- Tool Selection and Routing ---
def get_tools() -> List[BaseTool]:
    """Create and return a list of tools for the agent."""
    
    text_reverser_tool = FunctionTool.from_defaults(
        fn=text_reverser,
        name="text_reverser",
        description="Reverses the given text. Useful for processing reversed questions or text.",
    )
    
    calculator_tool = FunctionTool.from_defaults(
        fn=simple_calculator,
        name="calculator",
        description="Performs simple calculations: add, subtract, multiply, divide.",
    )
    
    wikipedia_tool = FunctionTool.from_defaults(
        fn=wikipedia_search,
        name="wikipedia_search",
        description="Searches Wikipedia for information on a topic.",
    )
    
    web_tool = FunctionTool.from_defaults(
        fn=web_search,
        name="web_search",
        description="Fetches and extracts content from a specific web page.",
    )
    
    return [
        text_reverser_tool,
        calculator_tool,
        wikipedia_tool,
        web_tool
    ]

if __name__ == "__main__":
    print("This module defines tools for the agent. Run app.py or standalone_debug.py to test the agent.")