from dotenv import load_dotenv
import os
import gradio as gr
import urllib.parse
import re
from pytube import YouTube
from typing import List, Optional
from r_types import (
    SearchVideosResponse,
    SearchImagesResponse,
    SearchLinksResponse,
    LocalMapResponse,
    KnowledgeBaseResponse
)


def get_video_id(url: str) -> Optional[str]:
    """
    Safely retrieve the YouTube video_id from a given URL using pytube.
    Returns None if the URL is invalid or an error occurs.
    """
    if not url:
        return None

    try:
        yt = YouTube(url)
        return yt.video_id
    except Exception:
        # If the URL is invalid or pytube fails, return None
        return None


def embed_video(videos: List[SearchVideosResponse]) -> str:
    """
    Given a list of video data (with 'link' and 'title'),
    returns an HTML string of embedded YouTube iframes.
    """
    if not videos:
        return "<p>No videos found.</p>"

    # Collect each iframe snippet
    iframes = []
    for video in videos:
        url = video.get("link", "")
        video_id = get_video_id(url)
        if not video_id:
            # Skip invalid or non-parsable links
            continue

        title = video.get("title", "").replace('"', '\\"')  # Escape quotes
        iframe = f"""
        <iframe 
            width="560" 
            height="315" 
            src="https://www.youtube.com/embed/{video_id}" 
            title="{title}" 
            frameborder="0" 
            allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" 
            allowfullscreen>
        </iframe>
        """
        iframes.append(iframe)

    # If no valid videos after processing, return a fallback message
    if not iframes:
        return "<p>No valid YouTube videos found.</p>"

    # Join all iframes into one HTML string
    return "\n".join(iframes)


def embed_image(json_data: SearchImagesResponse) -> str:
    """
    Given image data with 'original' (URL) and 'title',
    returns an HTML string with an <img> tag.
    """
    title = json_data.get("title", "").replace('"', '\\"')
    original = json_data.get("original", "")

    if not original:
        return "<p>No image URL provided.</p>"

    embed_html = f"""
    <img src="{original}" alt="{title}" style="width:100%">
    """
    return embed_html


def build_search_links_response(urls: List[str]) -> List[SearchLinksResponse]:
    """
    Convert raw URLs into a list of dicts,
    each with 'title' and 'link' keys for display.
    """
    results = []
    for url in urls:
        # Extract the last part of the URL as a rough "title"
        raw_title = url.rstrip("/").split("/")[-1]

        # Decode URL-encoded entities like %20
        decoded_title = urllib.parse.unquote(raw_title)

        # Replace hyphens/underscores with spaces
        nice_title = decoded_title.replace("_", " ").replace("-", " ")

        results.append({"title": nice_title, "link": url})
    return results


def format_links(links: List[SearchLinksResponse]) -> str:
    """
    Convert a list of {'title': str, 'link': str} objects
    into a bulleted Markdown string with clickable links.
    """
    if not links:
        return "No links found."

    links_md = "### Links\n\n"
    for item in links:
        links_md += f"- [{item['title']}]({item['link']})\n"
    return links_md


def embed_google_map(map_url: str) -> str:
    """
    Extracts a textual location from the given Google Maps URL
    and returns an embedded Google Map iframe for that location.
    Assumes you have a valid API key in place of 'YOUR_API_KEY'.
    """
    load_dotenv()
    GOOGLE_MAPS_API_KEY = os.getenv("GOOGLE_MAPS_API_KEY")

    if not map_url:
        return "<p>Invalid Google Maps URL.</p>"

    # Attempt to extract "San+Francisco,+CA" from the URL
    match = re.search(r"/maps/place/([^/]+)", map_url)
    if not match:
        return "Invalid Google Maps URL. Could not extract location."

    location_text = match.group(1)
    # Remove query params or additional slashes from the captured group
    location_text = re.split(r"[/?]", location_text)[0]

    # URL-encode location to avoid issues with special characters
    encoded_location = urllib.parse.quote(location_text, safe="")

    embed_html = f"""
    <iframe
      width="600"
      height="450"
      style="border:0"
      loading="lazy"
      allowfullscreen
      src="https://www.google.com/maps/embed/v1/place?key={GOOGLE_MAPS_API_KEY}&q={encoded_location}">
    </iframe>
    """
    return embed_html


def format_knowledge(result: KnowledgeBaseResponse) -> str:
    """
    Given a dictionary of knowledge data (e.g., about a person),
    produce a Markdown string summarizing that info.
    """
    title = result.get("title", "Unknown")
    type_ = result.get("type", "")
    born = result.get("born", "")
    died = result.get("died", "")

    content = f"""
**{title}**  
Type: {type_}  
Born: {born}  
Died: {died}
    """
    return content


def format_followup_questions(questions: List[str]) -> str:
    """
    Given a list of follow-up questions, return a Markdown string
    with each question as a bulleted list item.
    """
    if not questions:
        return "No follow-up questions provided."

    questions_md = "### Follow-up Questions\n\n"
    for question in questions:
        questions_md += f"- {question}\n"
    return questions_md