import asyncio
import os
from datetime import datetime
from sqlalchemy.orm import Session
from .models import Track, PlayHistory
from .database import SessionLocal
from .services.spotify_client import SpotifyClient
from .services.reccobeats_client import ReccoBeatsClient
from dateutil import parser

# Initialize Spotify Client (env vars will be populated later)
def get_spotify_client():
    return SpotifyClient(
        client_id=os.getenv("SPOTIFY_CLIENT_ID"),
        client_secret=os.getenv("SPOTIFY_CLIENT_SECRET"),
        refresh_token=os.getenv("SPOTIFY_REFRESH_TOKEN"),
    )

def get_reccobeats_client():
    return ReccoBeatsClient()

async def enrich_tracks(db: Session, spotify_client: SpotifyClient, recco_client: ReccoBeatsClient):
    """
    Finds tracks missing genres (Spotify) or audio features (ReccoBeats) and enriches them.
    """

    # 1. Enrich Audio Features (via ReccoBeats)
    tracks_missing_features = db.query(Track).filter(Track.danceability == None).limit(50).all()
    print(f"DEBUG: Found {len(tracks_missing_features)} tracks missing audio features.")

    if tracks_missing_features:
        print(f"Enriching {len(tracks_missing_features)} tracks with audio features (ReccoBeats)...")
        ids = [t.id for t in tracks_missing_features]

        features_list = await recco_client.get_audio_features(ids)

        features_map = {}
        for f in features_list:
            if "href" in f and "track/" in f["href"]:
                tid = f["href"].split("track/")[1].split("?")[0]
                features_map[tid] = f

        updated_count = 0
        for track in tracks_missing_features:
            data = features_map.get(track.id)
            if data:
                track.danceability = data.get("danceability")
                track.energy = data.get("energy")
                track.key = data.get("key")
                track.loudness = data.get("loudness")
                track.mode = data.get("mode")
                track.speechiness = data.get("speechiness")
                track.acousticness = data.get("acousticness")
                track.instrumentalness = data.get("instrumentalness")
                track.liveness = data.get("liveness")
                track.valence = data.get("valence")
                track.tempo = data.get("tempo")
                updated_count += 1

        print(f"Updated {updated_count} tracks with audio features.")
        db.commit()

    # 2. Enrich Genres (via Spotify Artists)
    tracks_missing_genres = db.query(Track).filter(Track.genres == None).limit(50).all()

    if tracks_missing_genres:
        print(f"Enriching {len(tracks_missing_genres)} tracks with genres (Spotify)...")

        artist_ids = set()
        track_artist_map = {}

        for t in tracks_missing_genres:
            if t.raw_data and "artists" in t.raw_data:
                a_ids = [a["id"] for a in t.raw_data["artists"]]
                artist_ids.update(a_ids)
                track_artist_map[t.id] = a_ids

        artist_ids_list = list(artist_ids)
        artist_genre_map = {}

        for i in range(0, len(artist_ids_list), 50):
            chunk = artist_ids_list[i:i+50]
            artists_data = await spotify_client.get_artists(chunk)
            for a_data in artists_data:
                if a_data:
                    artist_genre_map[a_data["id"]] = a_data.get("genres", [])

        for t in tracks_missing_genres:
            a_ids = track_artist_map.get(t.id, [])
            combined_genres = set()
            for a_id in a_ids:
                genres = artist_genre_map.get(a_id, [])
                combined_genres.update(genres)

            t.genres = list(combined_genres)

        db.commit()


async def ingest_recently_played(db: Session):
    spotify_client = get_spotify_client()
    recco_client = get_reccobeats_client()

    try:
        items = await spotify_client.get_recently_played(limit=50)
    except Exception as e:
        print(f"Error connecting to Spotify: {e}")
        return

    print(f"Fetched {len(items)} items from Spotify.")

    for item in items:
        track_data = item["track"]
        played_at_str = item["played_at"]
        played_at = parser.isoparse(played_at_str)

        track_id = track_data["id"]
        track = db.query(Track).filter(Track.id == track_id).first()

        if not track:
            print(f"New track found: {track_data['name']}")
            track = Track(
                id=track_id,
                name=track_data["name"],
                artist=", ".join([a["name"] for a in track_data["artists"]]),
                album=track_data["album"]["name"],
                duration_ms=track_data["duration_ms"],
                popularity=track_data["popularity"],
                raw_data=track_data
            )
            db.add(track)
            db.commit()

        exists = db.query(PlayHistory).filter(
            PlayHistory.track_id == track_id,
            PlayHistory.played_at == played_at
        ).first()

        if not exists:
            print(f" recording play: {track_data['name']} at {played_at}")
            play = PlayHistory(
                track_id=track_id,
                played_at=played_at,
                context_uri=item.get("context", {}).get("uri") if item.get("context") else None
            )
            db.add(play)

    db.commit()

    # Enrich
    await enrich_tracks(db, spotify_client, recco_client)

async def run_worker():
    """Simulates a background worker loop."""
    db = SessionLocal()

    try:
        while True:
            print("Worker: Polling Spotify...")
            await ingest_recently_played(db)
            print("Worker: Sleeping for 60 seconds...")
            await asyncio.sleep(60)
    except Exception as e:
        print(f"Worker crashed: {e}")
    finally:
        db.close()