import os
from typing import Dict, List

import requests
from llama_index.core.llms import ChatMessage
from tavily import TavilyClient

from llms import llm_openai

last_news = []


def get_news(query: str) -> List[Dict]:
    """
    Fetches news articles related to the specified query, analyzes their sentiment and named entities, and returns a list of processed news items.

    Args:
        query: A string representing the search query for news articles.

    Returns:
        List[Dict]: A list of dictionaries, each containing:
            - index (int): The position of the article in the result list.
            - title (str): The title of the news article.
            - summary (str): The description or summary of the article.
            - sentiment: The sentiment analysis result of the summary.
            - entities: The named entities recognized in the summary.
        If an error occurs during the API request, returns a list with a single dictionary containing an "error" key and the error message.

    Raises:
        None. All exceptions are caught and returned as error messages in the result.
    """
    global last_news
    print(f"Fetching news for query: {query}")
    last_news.clear()  # Clear previous news to avoid duplication

    search_results = web_search(f'Find the latest news related to: {query}')
    if search_results:
        for res in search_results:
            last_news.append({
                "index": len(last_news) + 1,
                "title": res.get("title", "No title available"),
                "summary": res.get("content", "No summary available"),
            })
    print(f"Found {len(last_news)} articles.")
    return last_news


def generate_implications(article_index: int) -> str:
    """
    Generates a string describing the possible implications of a news article based on its index.

    Args:
        article_index: The 1-based index of the article in the global `last_news` list.

    Returns:
        str: A message containing the implications for the specified article, or an error message if the index is invalid.
    """
    global last_news
    print(f"Generating implications for article index: {article_index}")
    if not (1 <= article_index <= len(last_news)):
        return "Invalid article index."
    article = last_news[article_index - 1]
    summary = article["summary"]
    prompt = f"question: What are the possible implications of this news? context: {summary}"
    try:
        result = llm_openai.chat(
            messages=[ChatMessage(role="user", content=prompt)]
        )
    except Exception as e:
        return f"Error generating implications: {str(e)}"
    print(f"Generated implications: {result.message.content}")
    return f"Implications for article {article_index}: {result.message.content}"


def web_search(query: str) -> List[Dict]:
    """
    Performs a web search and returns a list of results.

    Args:
        query: The search query string.

    Returns:
        List[Dict]: A list of dictionaries containing search results, each with 'title', 'snippet', and 'url'.
    """
    client = TavilyClient(os.environ.get("TAVILY_API_KEY"))
    response = client.search(query)
    print(f"Web search results for query '{query}': {response}")
    return response['results'] if 'results' in response else []


def browse_page(url: str, query: str) -> str:
    """
    Fetches the content of a web page and returns it as a string.

    Args:
        url: The URL of the web page to fetch.
        query: A query string to search within the page content.

    Returns:
        str: The content of the web page, or an error message if the page cannot be fetched.
    """
    try:
        response = requests.get(url)
        response.raise_for_status()
        return response.text
    except requests.RequestException as e:
        return f"Error fetching page: {str(e)}"


def get_lead_up_events(article_index: int) -> str:
    """
    Retrieves a brief timeline or background of events leading up to a news article's topic.
    Given the index of a news article, this function searches for relevant historical context and generates a summary of the lead-up events.

    Args:
        article_index: The 1-based index of the article in the global `last_news` list.

    Returns:
        str: A formatted string summarizing the lead-up events or background information for the article's topic.
    """
    global last_news
    print(f"Getting lead-up events for article index: {article_index}")
    if not (1 <= article_index <= len(last_news)):
        return "Invalid article index."
    article = last_news[article_index - 1]

    historical_context = web_search(
        'What are the events leading up to ' + article["title"])

    prompt = f"""
    Make a chronology of what are the leading events for this article.

    <article>
    {article["title"]}
    </article>
    
    <historical_context>
    {historical_context}
    </historical_context>
    """
    try:
        result = llm_openai.chat(
            messages=[ChatMessage(role="user", content=prompt)]
        )
    except Exception as e:
        return f"Error generating background information: {str(e)}"
    print(f"Generated background information: {result.message.content}")
    return f"Background information for article {article_index}: {result.message.content}"


def call_llm(prompt: str) -> str:
    """
    Calls the LLM with a given prompt and returns the response.

    Args:
        prompt: The input prompt to send to the LLM.

    Returns:
        str: The response from the LLM.
    """
    try:
        result = llm_openai.chat(
            messages=[ChatMessage(role="user", content=prompt)]
        )
        return result.message.content
    except Exception as e:
        return f"Error calling LLM: {str(e)}"


def get_social_media_opinions(article_index: int) -> str:
    """
    Analyzes social media opinions related to a news article by its index.

    Given the index of a news article and a search function, this function retrieves relevant social media posts,
    analyzes their sentiment, and categorizes the number of positive and negative opinions as 'low', 'medium', or 'high'.

    Args:
        article_index: The 1-based index of the article in the global `last_news` list.

    Returns:
        str: A summary string indicating the categorized number of positive and negative opinions about the event.
    """
    global last_news
    print(f"Getting social media opinions for article index: {article_index}")
    if not (1 <= article_index <= len(last_news)):
        return "Invalid article index."
    article = last_news[article_index - 1]
    title = article["title"]

    pos_posts = web_search(
        f'What are the positive social media reactions related to: {title}?')
    neg_posts = web_search(
        f'What are the negative social media reactions related to: {title}?')

    # haz un resumen con el llm de los posts positivos
    pos_summary = call_llm(
        'Make a summary of the following social media posts: ' + str(pos_posts))
    neg_summary = call_llm(
        'Make a summary of the following social media posts: ' + str(neg_posts))

    print(f"Positive summary: {pos_summary}")
    print(f"Negative summary: {neg_summary}")

    return f"""
    Social Media Opinions for Article {article_index}:
    Positive Summary: {pos_summary}
    Negative Summary: {neg_summary}
    """