app.py

import gradio as gr
import requests
import os
import re

# Fetch the keys from the environment variable and convert them into a list
YOUTUBE_API_KEYS = os.getenv("YOUTUBE_API_KEYS")

if YOUTUBE_API_KEYS:
    YOUTUBE_API_KEYS = [key.strip() for key in YOUTUBE_API_KEYS.split(",")]
else:
    raise ValueError("API keys not found. Make sure the secret 'YOUTUBE_API_KEYS' is set.")

# Index to keep track of which API key to use
key_index = 0

def get_api_key():
    global key_index
    # Get the current API key and increment the index
    api_key = YOUTUBE_API_KEYS[key_index]
    key_index = (key_index + 1) % len(YOUTUBE_API_KEYS)  # Rotate to the next key
    return api_key

# Function to search YouTube videos using the API with pagination to get up to 1,000 results
def youtube_search(query, max_results=50):
    search_url = "https://www.googleapis.com/youtube/v3/search"
    all_results = []
    params = {
        "part": "snippet",
        "q": query,
        "type": "video",
        "maxResults": 50  # YouTube API allows a maximum of 50 per request
    }

    try:
        while len(all_results) < max_results:
            params["key"] = get_api_key()  # Get the current API key
            response = requests.get(search_url, params=params)

            # If we get a bad response, try the next API key
            if response.status_code == 403 or response.status_code == 429:
                print(f"Quota exceeded or forbidden for API key. Trying next key...")
                continue
            response.raise_for_status()  # Raise an error for other bad responses (4xx or 5xx)

            results = response.json().get("items", [])
            for result in results:
                video_info = {
                    'thumbnail_url': result["snippet"]["thumbnails"]["medium"]["url"],
                    'video_id': result["id"]["videoId"],
                    'title': result["snippet"]["title"],
                    'description': result["snippet"]["description"]
                }
                all_results.append(video_info)

            # If there is no nextPageToken, we've reached the end
            if 'nextPageToken' not in response.json() or len(all_results) >= max_results:
                break

            # Update params with the nextPageToken to get the next batch of results
            params['pageToken'] = response.json()['nextPageToken']

        return all_results

    except requests.exceptions.RequestException as e:
        # Print the error message to help debug issues
        print(f"Error during YouTube API request: {e}")
        return [], f"Error retrieving video results: {str(e)}"

# Function to display the video using the video URL
def show_video(video_url):
    # Regular expression to extract the YouTube video ID from the URL
    video_id = None
    patterns = [
        r"youtube\.com/watch\?v=([^\&\?\/]+)",
        r"youtube\.com/embed/([^\&\?\/]+)",
        r"youtube\.com/v/([^\&\?\/]+)",
        r"youtu\.be/([^\&\?\/]+)"
    ]

    for pattern in patterns:
        match = re.search(pattern, video_url)
        if match:
            video_id = match.group(1)
            break

    # If no video ID is found, return an error message
    if not video_id:
        return "Invalid YouTube URL. Please enter a valid YouTube video link."

    # Create the embed URL
    embed_url = f"https://www.youtube.com/embed/{video_id}"

    # Return an iframe with the video
    html_code = f'''
    <iframe width="560" height="315" src="{embed_url}" 
    frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" 
    allowfullscreen></iframe>
    '''
    return html_code

# Create the Gradio interface
with gr.Blocks() as demo:
    gr.Markdown("## YouTube Video Search, Selection, and Playback")
    video_ids_state = gr.State()  # To store video IDs corresponding to the search results

    with gr.Row():
        with gr.Column(scale=3):
            search_query_input = gr.Textbox(label="Search YouTube", placeholder="Enter your search query here")
            search_button = gr.Button("Search")
            search_output = gr.Gallery(label="Search Results", columns=1, height="800px")
        
        with gr.Column(scale=2):
            selected_video_link = gr.Textbox(label="Selected Video Link", interactive=False)
            play_video_button = gr.Button("Play Video")
            video_output = gr.HTML(label="Video Player")

    # Update the search results and store video IDs
    def update_search_results(query):
        search_results = youtube_search(query)
        gallery_items = []
        video_ids = []
        for item in search_results:
            image_url = item['thumbnail_url']
            title = item['title']
            description = item['description']
            caption = f"{title}\n{description}"
            gallery_items.append((image_url, caption))
            video_ids.append(item['video_id'])
        return gallery_items, video_ids

    # When a video is selected
    def on_video_select(evt: gr.SelectData, video_ids):
        index = evt.index
        selected_video_id = video_ids[index]
        video_url = f"https://www.youtube.com/watch?v={selected_video_id}"
        return video_url

    # Play the video
    def play_video(video_url):
        return show_video(video_url)

    search_button.click(update_search_results, inputs=search_query_input, outputs=[search_output, video_ids_state])
    search_output.select(on_video_select, inputs=video_ids_state, outputs=selected_video_link)
    play_video_button.click(play_video, inputs=selected_video_link, outputs=video_output)

# Launch the Gradio interface
demo.launch()