from langchain_community.tools import DuckDuckGoSearchResults
from langchain_community.document_loaders import WikipediaLoader
from langchain_community.document_loaders import ArxivLoader

from langchain_core.documents import Document


SEP_CHAR = "\n\n---\n\n"


def multiply(a: int, b: int) -> int:
    """Multiply two numbers.
    Args:
        a: first int
        b: second int
    """
    return a * b


def add(a: int, b: int) -> int:
    """Add two numbers.
    
    Args:
        a: first int
        b: second int
    """
    return a + b


def subtract(a: int, b: int) -> int:
    """Subtract two numbers.
    
    Args:
        a: first int
        b: second int
    """
    return a - b


def divide(a: int, b: int) -> int:
    """Divide two numbers.
    
    Args:
        a: first int
        b: second int
    """
    if b == 0:
        raise ValueError("Cannot divide by zero.")
    return a / b


def modulus(a: int, b: int) -> int:
    """Get the modulus of two numbers.
    
    Args:
        a: first int
        b: second int
    """
    return a % b


def wiki_search(query: str) -> dict:
    """Search Wikipedia for a query and return maximum 2 results.
    
    Args:
        query: The search query."""
    search_docs: list[Document] = WikipediaLoader(query=query, load_max_docs=2).load()
    formatted_search_docs = SEP_CHAR.join(
        [
            f'<Document source="{doc.metadata["source"]}"/>\n{doc.page_content}\n</Document>'
            for doc in search_docs
        ])
    return formatted_search_docs


def web_search(query: str) -> dict:
    """Search Web for a query and return maximum 3 results.
    
    Args:
        query: The search query."""
    search_docs: list[dict] = DuckDuckGoSearchResults(num_results=3, output_format='list').invoke(input=query)
    formatted_search_docs = SEP_CHAR.join(
        [
            f'<Document source="{doc["link"]}" title="{doc.get("title", "")}"/>\n{doc["snippet"]}\n</Document>'
            for doc in search_docs
        ])
    return formatted_search_docs


def arvix_search(query: str) -> dict:
    """Search Arxiv for a query and return maximum 3 result.
    
    Args:
        query: The search query."""
    search_docs: list[Document] = ArxivLoader(query=query).load()
    formatted_search_docs = SEP_CHAR.join(
        [
            f'<Document title="{doc.metadata["Title"]}" authors="{doc.metadata.get("Authors", "")}"/>\n{doc.page_content[:1000]}\n</Document>'
            for doc in search_docs
        ])
    return formatted_search_docs

tools = [
    multiply,
    add,
    subtract,
    divide,
    modulus,
    wiki_search,
    web_search,
    arvix_search,
]