from trendspy import Trends
import streamlit as st
from datetime import datetime, timezone
tr = Trends()

TREND_TOPICS = {
    1: "Autos and Vehicles",
    2: "Beauty and Fashion",
    3: "Business and Finance",
    20: "Climate",
    4: "Entertainment",
    5: "Food and Drink",
    6: "Games",
    7: "Health",
    8: "Hobbies and Leisure",
    9: "Jobs and Education",
    10: "Law and Government",
    11: "Other",
    13: "Pets and Animals",
    14: "Politics",
    15: "Science",
    16: "Shopping",
    17: "Sports",
    18: "Technology",
    19: "Travel and Transportation"
}
trends_json = {}
def process_trends_for_country(country_code, trends_list):
    if country_code not in trends_json:
        trends_json[country_code] = {"All categories" : {}}
    for trend in trends_list:

        category = None
        for topic_id in trend.topics:
            if topic_id in TREND_TOPICS:
                category = TREND_TOPICS[topic_id]
                break
        if category is None:
            category = TREND_TOPICS[11]  

        if category not in trends_json[country_code]:
            trends_json[country_code][category] = {}

        topic_name = trend.keyword

        try:
            news = tr.trending_now_news_by_ids(trend.news_tokens, max_news=3)
            articles = [
                {"title": article.title, "href": article.url}
                for article in news
            ]
        
        except Exception as e:
            articles=[]
        trends_json[country_code]["All categories"][topic_name] = {
            "searchQueries": trend.volume, 
            "articles": articles,
            "ended_timestamp": convert_to_datetime(trend.started_timestamp[0]),
        }
        trends_json[country_code][category][topic_name] = {
            "searchQueries": trend.volume, 
            "articles": articles,
        }

def convert_to_datetime( raw_time):
    """Converts time in seconds to a datetime object with UTC timezone, if it exists."""
    return datetime.fromtimestamp(raw_time, tz=timezone.utc) if raw_time else None

def get_trends(countries: list):
    for country in countries:
        trends = tr.trending_now(geo=country)
        
        process_trends_for_country(country, trends)
        all_categories = trends_json[country]["All categories"]
    return trends_json