# modules/api_utils.py
"""API utility functions for Wikimedia services"""

import requests
from typing import Dict, List, Optional
import time
import random # Import the random module
from config.settings import (
    WIKIPEDIA_API,
    WIKIDATA_API,
    WIKIBOOKS_API,
    WIKI_REST_API,
    CACHE_TIMEOUT,
)

# Cache for API responses
_cache = {}


def _get_cached_or_fetch(url: str, params: Dict = None) -> Optional[Dict]:
    """Get cached response or fetch from API. Uses a simple in-memory cache."""
    cache_key = f"{url}_{str(params)}"

    if cache_key in _cache:
        cached_data, timestamp = _cache[cache_key]
        if time.time() - timestamp < CACHE_TIMEOUT: # Fixed: changed _cache_timeout to CACHE_TIMEOUT
            return cached_data

    try:
        response = requests.get(
            url, params=params, timeout=10
        )  # Increased timeout for robustness
        if response.status_code == 200:
            data = response.json()
            _cache[cache_key] = (data, time.time() + CACHE_TIMEOUT)
            return data
    except requests.exceptions.RequestException as e:
        print(f"API request error: {e}")

    return None


def fetch_wikipedia_summary(topic: str) -> Optional[Dict]:
    """Fetch Wikipedia page summary with caching"""
    return _get_cached_or_fetch(f"{WIKI_REST_API}{topic}")


def search_wikipedia(query: str, limit: int = 5) -> List[str]:
    """Search Wikipedia for topics"""
    params = {"action": "opensearch", "search": query, "limit": limit, "format": "json"}

    data = _get_cached_or_fetch(WIKIPEDIA_API, params)
    if data and len(data) > 1:
        return data[1]
    return []


def fetch_wikidata_entity(entity_id: str) -> Optional[Dict]:
    """Fetch Wikidata entity information"""
    params = {
        "action": "wbgetentities",
        "ids": entity_id,
        "format": "json",
        "languages": "en",
    }

    return _get_cached_or_fetch(WIKIDATA_API, params)


def fetch_wikipedia_categories(page_title: str) -> List[str]:
    """Fetch categories for a Wikipedia page"""
    params = {
        "action": "query",
        "prop": "categories",
        "titles": page_title,
        "format": "json",
        "cllimit": 10,
    }

    data = _get_cached_or_fetch(WIKIPEDIA_API, params)
    if data:
        pages = data.get("query", {}).get("pages", {})
        for page_id, page_data in pages.items():
            categories = page_data.get("categories", [])
            return [cat["title"].replace("Category:", "") for cat in categories]
    return []


def fetch_related_topics(topic: str, limit: int = 5) -> List[str]:
    """Fetch related topics from Wikipedia"""
    params = {
        "action": "query",
        "list": "search",
        "srsearch": topic,
        "srlimit": limit,
        "format": "json",
    }

    data = _get_cached_or_fetch(WIKIPEDIA_API, params)
    if data:
        search_results = data.get("query", {}).get("search", [])
        return [
            result["title"] for result in search_results if result["title"] != topic
        ]
    return []


def fetch_wikibooks_content(topic: str) -> Optional[str]:
    """Fetch content from Wikibooks"""
    params = {"action": "query", "list": "search", "srsearch": topic, "format": "json"}

    data = _get_cached_or_fetch(WIKIBOOKS_API, params)
    if data:
        search_results = data.get("query", {}).get("search", [])
        if search_results:
            return search_results[0].get("snippet", "")
    return None

def fetch_wikipedia_page_details(topic: str) -> Optional[Dict]:
    """Fetch detailed Wikipedia page content and images."""
    params = {
        "action": "query",
        "format": "json",
        "titles": topic,
        "prop": "extracts|pageimages",
        "exintro": False, # Get full extract
        "explaintext": True, # Get plain text
        "pithumbsize": 200, # Thumbnail size for images
        "redirects": 1 # Resolve redirects
    }
    data = _get_cached_or_fetch(WIKIPEDIA_API, params)

    if data and "query" in data and "pages" in data["query"]:
        page_id = next(iter(data["query"]["pages"])) # Get the first page ID
        page_data = data["query"]["pages"][page_id]

        if "missing" in page_data:
            return None # Page not found

        extract = page_data.get("extract", "")
        images = []
        if "pageimages" in page_data and "thumbnail" in page_data["pageimages"]:
            images.append(page_data["pageimages"]["thumbnail"]["source"])
        
        return {
            "title": page_data.get("title"),
            "extract": extract,
            "images": images,
            "full_url": f"https://en.wikipedia.org/wiki/{page_data.get('title').replace(' ', '_')}"
        }
    return None

def fetch_wikipedia_images(topic: str, limit: int = 1) -> List[str]:
    """Fetch image URLs for a given topic from Wikipedia, prioritizing relevant images."""
    image_urls = []

    # First, try to get images directly from pageimages (main image/thumbnail)
    page_details_params = {
        "action": "query",
        "format": "json",
        "titles": topic,
        "prop": "pageimages",
        "pithumbsize": 400, # Larger thumbnail
        "redirects": 1
    }
    page_details_data = _get_cached_or_fetch(WIKIPEDIA_API, page_details_params)
    if page_details_data and "query" in page_details_data and "pages" in page_details_data["query"]:
        page_id = next(iter(page_details_data["query"]["pages"]))
        page_data = page_details_data["query"]["pages"][page_id]
        if "pageimages" in page_data and "thumbnail" in page_data["pageimages"]:
            image_urls.append(page_data["pageimages"]["thumbnail"]["source"])
            if len(image_urls) >= limit:
                return image_urls

    # If not enough images, try fetching all images from the page and filter
    params = {
        "action": "query",
        "format": "json",
        "titles": topic,
        "prop": "images",
        "imlimit": "max", # Fetch all images used on the page
        "redirects": 1
    }
    data = _get_cached_or_fetch(WIKIPEDIA_API, params)

    if data and "query" in data and "pages" in data["query"]:
        page_id = next(iter(data["query"]["pages"]))
        page_data = data["query"]["pages"][page_id]

        if "images" in page_data:
            all_page_images = []
            for img_info in page_data["images"]:
                # Basic relevance heuristic: check if topic keywords are in image title
                if topic.lower() in img_info["title"].lower() or any(keyword.lower() in img_info["title"].lower() for keyword in topic.split()):
                    all_page_images.append(img_info["title"])
            
            random.shuffle(all_page_images) # Shuffle to get different relevant images each time

            for image_title in all_page_images:
                if len(image_urls) >= limit:
                    break
                # Fetch image info to get direct URL
                image_params = {
                    "action": "query",
                    "format": "json",
                    "titles": image_title,
                    "prop": "imageinfo",
                    "iiprop": "url",
                }
                image_data = _get_cached_or_fetch(WIKIPEDIA_API, image_params)
                if image_data and "query" in image_data and "pages" in image_data["query"]:
                    img_page_id = next(iter(image_data["query"]["pages"]))
                    img_page_data = image_data["query"]["pages"][img_page_id]
                    if "imageinfo" in img_page_data and img_page_data["imageinfo"]:
                        image_urls.append(img_page_data["imageinfo"][0]["url"])
    
    return image_urls[:limit] # Ensure limit is respected