"""Flask web application for YouTube RSS feed parsing."""

from flask import Flask, render_template, request, jsonify
from feed_parser import YouTubeFeedParser
from database import init_db, get_db_session
from models import Channel, VideoEntry


app = Flask(__name__)

# Default channel ID for demonstration
DEFAULT_CHANNEL_ID = "UCtTWOND3uyl4tVc_FarDmpw"


# Initialize database on app startup
with app.app_context():
    init_db()


@app.route("/", methods=["GET"])
def index():
    """Render the main page."""
    return render_template("index.html")


@app.route("/api/feed", methods=["GET"])
def get_feed():
    """API endpoint to fetch YouTube channel feed and save to database.

    Query parameters:
        channel_id: YouTube channel ID (optional, uses default if not provided)
        filter_shorts: Whether to filter out Shorts (default: true)
        save: Whether to save to database (default: true)

    Returns:
        JSON response with feed data or error message
    """
    channel_id = request.args.get("channel_id", DEFAULT_CHANNEL_ID)
    filter_shorts = request.args.get("filter_shorts", "true").lower() == "true"
    save_to_db = request.args.get("save", "true").lower() == "true"

    parser = YouTubeFeedParser(channel_id)
    result = parser.fetch_feed(filter_shorts=filter_shorts)

    if result is None:
        return jsonify({"error": "Failed to fetch feed"}), 500

    # Save to database if requested
    if save_to_db:
        try:
            with get_db_session() as session:
                parser.save_to_db(session, result)
        except Exception as e:
            return jsonify({"error": f"Failed to save to database: {str(e)}"}), 500

    return jsonify(result)


@app.route("/api/channels", methods=["GET"])
def get_channels():
    """API endpoint to list all tracked channels.

    Returns:
        JSON response with list of channels
    """
    try:
        with get_db_session() as session:
            channels = session.query(Channel).all()
            return jsonify({
                "channels": [
                    {
                        "id": ch.id,
                        "channel_id": ch.channel_id,
                        "title": ch.title,
                        "link": ch.link,
                        "last_fetched": ch.last_fetched.isoformat(),
                        "video_count": len(ch.videos)
                    }
                    for ch in channels
                ]
            })
    except Exception as e:
        return jsonify({"error": f"Failed to fetch channels: {str(e)}"}), 500


@app.route("/api/history/<channel_id>", methods=["GET"])
def get_history(channel_id: str):
    """API endpoint to get video history for a specific channel.

    Args:
        channel_id: YouTube channel ID

    Query parameters:
        limit: Maximum number of videos to return (default: 50)

    Returns:
        JSON response with channel info and video history
    """
    limit = request.args.get("limit", "50")
    try:
        limit = int(limit)
    except ValueError:
        limit = 50

    try:
        with get_db_session() as session:
            channel = session.query(Channel).filter_by(
                channel_id=channel_id
            ).first()

            if not channel:
                return jsonify({"error": "Channel not found"}), 404

            videos = session.query(VideoEntry).filter_by(
                channel_id=channel.id
            ).order_by(VideoEntry.created_at.desc()).limit(limit).all()

            return jsonify({
                "channel": {
                    "channel_id": channel.channel_id,
                    "title": channel.title,
                    "link": channel.link,
                    "last_fetched": channel.last_fetched.isoformat()
                },
                "videos": [video.to_dict() for video in videos],
                "total_videos": len(channel.videos)
            })
    except Exception as e:
        return jsonify({"error": f"Failed to fetch history: {str(e)}"}), 500


def main():
    """CLI entry point for testing feed parser."""
    parser = YouTubeFeedParser(DEFAULT_CHANNEL_ID)
    result = parser.fetch_feed()

    if result is None:
        print("Failed to retrieve RSS feed")
        return

    print(f"Feed Title: {result['feed_title']}")
    print(f"Feed Link: {result['feed_link']}")

    for entry in result['entries']:
        print(f"\nEntry Title: {entry['title']}")
        print(f"Entry Link: {entry['link']}")


if __name__ == "__main__":
    main()