import asyncio
import urllib.parse
from typing import List, Dict, Any, Optional
import httpx
import yt_dlp
from app.config import settings
from app.providers.yandex import YandexMusicProvider

yandex_provider = YandexMusicProvider()

def format_duration(ms: Optional[int]) -> str:
    if not ms:
        return "00:00"
    total_sec = ms // 1000
    m = total_sec // 60
    s = total_sec % 60
    return f"{m:02d}:{s:02d}"

async def search_yandex(query: str) -> Dict[str, List[Dict[str, Any]]]:
    """Search tracks and albums via Yandex Music."""
    loop = asyncio.get_event_loop()
    return await loop.run_in_executor(None, _search_yandex_sync, query)

def _search_yandex_sync(query: str) -> Dict[str, List[Dict[str, Any]]]:
    tracks = []
    albums = []
    try:
        client = yandex_provider.get_client()
        res = client.search(query, type_="all")
        
        if res.tracks and res.tracks.results:
            for t in res.tracks.results[:6]:
                if not t:
                    continue
                artists = ", ".join(a.name for a in t.artists) if t.artists else "Unknown"
                album_title = t.albums[0].title if t.albums else "Single"
                year = t.albums[0].year if t.albums and t.albums[0].year else None
                cover = "https://" + t.cover_uri.replace("%%", "400x400") if t.cover_uri else None
                tracks.append({
                    "service": "yandex",
                    "service_name": "Яндекс Музыка",
                    "id": str(t.id),
                    "title": t.title,
                    "artist": artists,
                    "album": album_title,
                    "year": year,
                    "duration": format_duration(t.duration_ms),
                    "cover": cover,
                    "url": f"https://music.yandex.ru/track/{t.id}"
                })

        if res.albums and res.albums.results:
            for a in res.albums.results[:4]:
                if not a:
                    continue
                artists = ", ".join(art.name for art in a.artists) if a.artists else "Unknown"
                cover = "https://" + a.cover_uri.replace("%%", "400x400") if a.cover_uri else None
                albums.append({
                    "service": "yandex",
                    "service_name": "Яндекс Музыка",
                    "id": str(a.id),
                    "title": a.title,
                    "artist": artists,
                    "year": a.year,
                    "track_count": a.track_count,
                    "cover": cover,
                    "url": f"https://music.yandex.ru/album/{a.id}"
                })
    except Exception as e:
        print(f"Yandex search error: {e}")
    return {"tracks": tracks, "albums": albums}

async def search_apple(query: str) -> Dict[str, List[Dict[str, Any]]]:
    """Search tracks and albums via Apple Music / iTunes public API."""
    tracks = []
    albums = []
    try:
        encoded = urllib.parse.quote(query)
        url = f"https://itunes.apple.com/search?term={encoded}&entity=song&limit=5"
        async with httpx.AsyncClient(timeout=8.0) as client:
            resp = await client.get(url)
            if resp.status_code == 200:
                data = resp.json()
                for r in data.get("results", []):
                    cover = r.get("artworkUrl100", "").replace("100x100bb", "400x400bb")
                    duration_ms = r.get("trackTimeMillis", 0)
                    release_date = r.get("releaseDate", "")
                    year = int(release_date[:4]) if release_date else None
                    tracks.append({
                        "service": "apple",
                        "service_name": "Apple Music",
                        "id": str(r.get("trackId")),
                        "title": r.get("trackName"),
                        "artist": r.get("artistName"),
                        "album": r.get("collectionName"),
                        "year": year,
                        "duration": format_duration(duration_ms),
                        "cover": cover,
                        "url": r.get("trackViewUrl")
                    })
    except Exception as e:
        print(f"Apple search error: {e}")
    return {"tracks": tracks, "albums": albums}

async def search_youtube(query: str) -> Dict[str, List[Dict[str, Any]]]:
    """Search tracks via YouTube Music."""
    loop = asyncio.get_event_loop()
    return await loop.run_in_executor(None, _search_youtube_sync, query)

def _search_youtube_sync(query: str) -> Dict[str, List[Dict[str, Any]]]:
    tracks = []
    ydl_opts = {
        "extract_flat": True,
        "quiet": True,
        "no_warnings": True,
    }
    try:
        with yt_dlp.YoutubeDL(ydl_opts) as ydl:
            info = ydl.extract_info(f"ytsearch3:{query}", download=False)
            if info and "entries" in info:
                for entry in info["entries"]:
                    if not entry:
                        continue
                    sec = entry.get("duration", 0)
                    tracks.append({
                        "service": "youtube",
                        "service_name": "YouTube",
                        "id": entry.get("id"),
                        "title": entry.get("title"),
                        "artist": entry.get("uploader") or entry.get("channel") or "Unknown",
                        "album": "YouTube Audio",
                        "year": None,
                        "duration": f"{sec // 60:02d}:{sec % 60:02d}" if sec else "00:00",
                        "cover": entry.get("thumbnail"),
                        "url": f"https://www.youtube.com/watch?v={entry.get('id')}"
                    })
    except Exception as e:
        print(f"YouTube search error: {e}")
    return {"tracks": tracks, "albums": []}

async def search_all(query: str) -> Dict[str, Any]:
    """Run concurrent search across all platforms."""
    yandex_task = search_yandex(query)
    apple_task = search_apple(query)
    youtube_task = search_youtube(query)

    y_res, a_res, yt_res = await asyncio.gather(yandex_task, apple_task, youtube_task)

    all_tracks = y_res["tracks"] + a_res["tracks"] + yt_res["tracks"]
    all_albums = y_res["albums"] + a_res["albums"]

    return {
        "query": query,
        "tracks": all_tracks,
        "albums": all_albums
    }