import logging
import os
from flask import Flask, render_template, request, Response, abort, jsonify
from werkzeug.exceptions import HTTPException

import dlp
from utils import is_valid_url, get_error_message

app = Flask(__name__)

LOG_LEVEL = os.getenv("LOG_LEVEL", "INFO")
logging.basicConfig(
    level=getattr(logging, LOG_LEVEL),
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
logger = logging.getLogger(__name__)

PORT = int(os.getenv("PORT", 5000))


@app.route("/")
def index():
    return render_template("index.html")


@app.route("/player")
def player():
    video_url = request.args.get("url")
    if not video_url:
        abort(400, description="Missing url parameter")
    
    if not is_valid_url(video_url):
        abort(400, description="Invalid or disallowed URL")
    
    try:
        stream_info = dlp.get_stream_info(video_url)
        from urllib.parse import quote
        
        # URL encode for path (use -- as delimiter)
        encoded_url = quote(video_url, safe="")
        
        # Only set HLS URL if we actually have HLS
        hls_url = stream_info.get("hls_url")
        proxy_hls_url = f"/hls/{encoded_url}--index.m3u8" if hls_url else None
        
        return render_template(
            "player.html",
            video_url=video_url,
            proxy_hls_url=proxy_hls_url,
            direct_url=stream_info.get("direct_url"),
            title=stream_info.get("title", "Video"),
            thumbnail=stream_info.get("thumbnail")
        )
    except Exception as e:
        logger.error(f"Error getting stream info: {e}")
        abort(500, description=str(e))


@app.route("/hls/<path:full_path>")
def hls_proxy(full_path):
    try:
        from urllib.parse import unquote
        
        # Split: last part is filename, rest is video URL
        # Format: /hls/<encoded_video_url>/<filename>
        # Since / is ambiguous (in URL and in video URL), we use a delimiter
        # Format: /hls/<encoded_video_url>--<filename>
        
        if "--" not in full_path:
            abort(400, description="Invalid path format")
        
        parts = full_path.rsplit("--", 1)
        if len(parts) != 2:
            abort(400, description="Invalid path format")
        
        encoded_video_url = parts[0]
        filename = parts[1]
        
        # Decode the video URL
        video_url = unquote(encoded_video_url)
        
        if not is_valid_url(video_url):
            abort(400, description="Invalid URL")
        
        # Main playlist request
        if filename == "index.m3u8":
            playlist = dlp.get_hls_playlist(video_url)
            return Response(playlist, mimetype="application/vnd.apple.mpegurl", headers={"Cache-Control": "public, max-age=31536000"})
        
        # Sub-playlist or segment request
        segment_url = unquote(filename)
        
        segment_data = dlp.get_hls_segment_with_retry(video_url, segment_url)
        
        if segment_data is None:
            abort(500, description="Failed to fetch segment")
        
        # Determine content-type by filename extension
        if filename.endswith(".m3u8"):
            return Response(segment_data, mimetype="application/vnd.apple.mpegurl", headers={"Cache-Control": "public, max-age=31536000"})
        return Response(segment_data, mimetype="video/mp2t", headers={"Cache-Control": "public, max-age=31536000"})
    
    except HTTPException:
        raise
    except ValueError as e:
        logger.warning(f"Validation error: {e}")
        abort(400, description=str(e))
    except Exception as e:
        logger.error(f"HLS proxy error: {e}")
        return Response(str(e), status=500, mimetype="text/plain")


@app.errorhandler(Exception)
def handle_error(e):
    if isinstance(e, HTTPException):
        return jsonify({"error": get_error_message(e.code), "message": str(e.description)}), e.code
    logger.error(f"Unexpected error: {e}")
    return jsonify({"error": "Internal Server Error", "message": str(e)}), 500


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=PORT)