import subprocess
import os
from config import settings
import requests

def detect_query_type(query: str):
    if "youtube.com/playlist" in query or "list=" in query:
        return "playlist"
    elif "youtube.com/watch" in query or "youtu.be/" in query:
        return "video"
    else:
        return "search"

def download_song(query: str):
    output_template = os.path.join(settings.MUSIC_DIR, "%(uploader)s/%(title)s.%(ext)s")

    query_type = detect_query_type(query)

    if query_type == "video":
        yt_query = query
        playlist_flag = "--no-playlist"
        extra_filters = []
    elif query_type == "playlist":
        yt_query = query
        playlist_flag = None
        extra_filters = []
    else:
        yt_query = f"ytsearch20:{query}"
        playlist_flag = "--no-playlist"
        filter_expr = f"'{query.lower()}' in uploader.lower()"  # ✅ valid expression
        extra_filters = ["--match-filter", filter_expr]

    command = [
        "yt-dlp",
        yt_query,
        "--extract-audio",
        "--audio-format", "mp3",
        "--output", output_template,
        "--quiet"
    ]

    if playlist_flag:
        command.append(playlist_flag)
    if extra_filters:
        command.extend(extra_filters)

    result = subprocess.run(command, capture_output=True, text=True)

    if result.returncode != 0:
        raise Exception(f"❌ Download failed:\n{result.stderr}")

    if settings.NAVIDROME_SCAN_URL:
        try:
            res = requests.get(settings.NAVIDROME_SCAN_URL, timeout=5)
            res.raise_for_status()
        except Exception as e:
            print(f"⚠️ Failed to trigger Navidrome rescan: {e}")

    return {
        "status": "success",
        "query": query,
        "log": result.stdout + "\n" + result.stderr
    }