from typing import Optional, Any
from uuid import uuid4
from urllib.parse import urlparse
import hashlib
import logging
import random
import asyncio
import os
import aiohttp
import time
from streamrip.client import TidalClient  # type: ignore
from streamrip.config import Config as StreamripConfig  # type: ignore
from dotenv import load_dotenv


load_dotenv()


class SRUtil:
    """
    StreamRip API Utility Class
    """

    def __init__(self) -> None:
        """Initialize StreamRip utility."""
        self.streamrip_config = StreamripConfig.defaults()
        self.streamrip_config.session.tidal.user_id = os.getenv("tidal_user_id", "")
        self.streamrip_config.session.tidal.access_token = os.getenv(
            "tidal_access_token", ""
        )
        self.streamrip_config.session.tidal.refresh_token = os.getenv(
            "tidal_refresh_token", ""
        )
        self.streamrip_config.session.tidal.token_expiry = os.getenv(
            "tidal_token_expiry", ""
        )
        self.streamrip_config.session.tidal.country_code = os.getenv(
            "tidal_country_code", ""
        )
        self.streamrip_config.session.tidal.quality = int(
            os.getenv("tidal_default_quality", 2)
        )
        self.streamrip_config.session.conversion.enabled = False
        self.streamrip_config.session.downloads.folder = os.getenv(
            "tidal_download_folder", ""
        )
        self.streamrip_config
        self.streamrip_client = TidalClient(self.streamrip_config)
        self.MAX_CONCURRENT_METADATA_REQUESTS = 2
        self.METADATA_RATE_LIMIT = 1.25
        self.METADATA_SEMAPHORE = asyncio.Semaphore(self.MAX_CONCURRENT_METADATA_REQUESTS)
        self.LAST_METADATA_REQUEST = 0
        self.MAX_METADATA_RETRIES = 5
        self.METADATA_ALBUM_CACHE: dict[str, dict] = {}
        self.RETRY_DELAY = 1.0  # seconds between retries

    async def rate_limited_request(self, func, *args, **kwargs):
            async with self.METADATA_SEMAPHORE:
                now = time.time()
                elapsed = now - self.LAST_METADATA_REQUEST
                if elapsed < self.METADATA_RATE_LIMIT:
                    await asyncio.sleep(self.METADATA_RATE_LIMIT - elapsed)
                result = await func(*args, **kwargs)
                self.last_request_time = time.time()
                return result        

    def dedupe_by_key(self, key: str, entries: list[dict]) -> list[dict]:
        deduped = {}
        for entry in entries:
            norm = entry[key].strip().lower()
            if norm not in deduped:
                deduped[norm] = entry
        return list(deduped.values())

    def format_duration(self, seconds):
        if not seconds:
            return None
        m, s = divmod(seconds, 60)
        return f"{m}:{s:02}"

    def combine_album_track_metadata(
        self, album_json: dict | None, track_json: dict
    ) -> dict:
        """
        Combine album-level and track-level metadata into a unified tag dictionary.
        Track-level metadata overrides album-level where relevant.
        """
        album_json = album_json or {}

        # Album-level
        combined = {
            "album": album_json.get("title"),
            "album_artist": album_json.get("artist", {}).get("name"),
            "release_date": album_json.get("releaseDate"),
            "album_type": album_json.get("type"),
            "total_tracks": album_json.get("numberOfTracks"),
            "upc": album_json.get("upc"),
            "album_copyright": album_json.get("copyright"),
            "album_cover_id": album_json.get("cover"),
            "album_cover_url": f"https://resources.tidal.com/images/{album_json.get('cover')}/1280x1280.jpg"
            if album_json.get("cover")
            else None,
        }

        # Track-level (overrides or adds to album info)
        combined.update(
            {
                "title": track_json.get("title"),
                "artist": track_json.get("artist", {}).get("name"),
                "artists": [a.get("name") for a in track_json.get("artists", [])],
                "track_number": track_json.get("trackNumber"),
                "disc_number": track_json.get("volumeNumber"),
                "duration": track_json.get("duration"),
                "isrc": track_json.get("isrc"),
                "bpm": track_json.get("bpm"),
                "explicit": track_json.get("explicit"),
                "replaygain": track_json.get("replayGain"),
                "peak": track_json.get("peak"),
                "lyrics": track_json.get("lyrics"),
                "track_copyright": track_json.get("copyright"),
                "cover_id": track_json.get("album", {}).get("cover") or album_json.get("cover"),
                "cover_url": (
                    f"https://resources.tidal.com/images/{track_json.get('album', {}).get('cover', album_json.get('cover'))}/1280x1280.jpg"
                    if (track_json.get("album", {}).get("cover") or album_json.get("cover"))
                    else None
                ),
            }
        )

        return combined


    def combine_album_with_all_tracks(
        self, album_json: dict[str, Any]
    ) -> list[dict[str, Any]]:
        """Return a list of combined metadata dicts for all tracks in an album JSON."""
        return [
            self.combine_album_track_metadata(album_json, t)
            for t in album_json.get("tracks", [])
        ]

    async def get_artists_by_name(self, artist_name: str) -> Optional[list]:
        """Get artist(s) by name.
        Args:
            artist_name (str): The name of the artist.
        Returns:
            Optional[dict]: The artist details or None if not found.
        """

        try:
            await self.streamrip_client.login()
        except Exception as e:
            logging.info("Login Exception: %s", str(e))
            pass
        artists_out: list[dict] = []
        try:
            artists = await self.streamrip_client.search(
                media_type="artist", query=artist_name
            )
        except AttributeError:
            await self.streamrip_client.login()
            artists = await self.streamrip_client.search(
                media_type="artist", query=artist_name
            )
        logging.critical("Artists output: %s", artists)
        artists = artists[0].get("items", [])
        if not artists:
            logging.warning("No artist found for name: %s", artist_name)
            return None
        artists_out = [
            {
                "artist": res["name"],
                "id": res["id"],
            }
            for res in artists
            if "name" in res and "id" in res
        ]
        artists_out = self.dedupe_by_key("artist", artists_out)  # Remove duplicates
        return artists_out

    async def get_albums_by_artist_id(self, artist_id: int) -> Optional[list | dict]:
        """Get albums by artist ID
        Args:
            artist_id (int): The ID of the artist.
        Returns:
            Optional[list[dict]]: List of albums or None if not found.
        """
        artist_id_str: str = str(artist_id)
        albums_out: list[dict] = []
        try:
            await self.streamrip_client.login()
            metadata = await self.streamrip_client.get_metadata(
                item_id=artist_id_str, media_type="artist"
            )
        except AttributeError:
            await self.streamrip_client.login()
            metadata = await self.streamrip_client.get_metadata(
                item_id=artist_id_str, media_type="artist"
            )
        if not metadata:
            logging.warning("No metadata found for artist ID: %s", artist_id)
            return None
        albums = self.dedupe_by_key("title", metadata.get("albums", []))
        albums_out = [
            {
                "artist": ", ".join(artist["name"] for artist in album["artists"]),
                "album": album["title"],
                "id": album["id"],
                "release_date": album.get("releaseDate", "Unknown"),
            }
            for album in albums
            if "title" in album and "id" in album and "artists" in album
        ]

        logging.debug("Retrieved albums: %s", albums_out)
        return albums_out

    async def get_tracks_by_album_id(
        self, album_id: int, quality: str = "FLAC"
    ) -> Optional[list | dict]:
        """Get tracks by album ID
        Args:
            album_id (int): The ID of the album.
        Returns:
            Optional[list[dict]]: List of tracks or None if not found.
        """
        album_id_str = str(album_id)
        await self.streamrip_client.login()
        metadata = await self.streamrip_client.get_metadata(
            item_id=album_id_str, media_type="album"
        )
        if not metadata:
            logging.warning("No metadata found for album ID: %s", album_id)
            return None

        track_list = metadata.get("tracks", [])
        tracks_out: list[dict] = [
            {
                "id": track.get("id"),
                "artist": track.get("artist").get("name"),
                "title": track.get("title"),
                "duration": self.format_duration(track.get("duration", 0)),
                "version": track.get("version"),
                "audioQuality": track.get("audioQuality"),
            }
            for track in track_list
        ]
        return tracks_out

    async def get_tracks_by_artist_song(self, artist: str, song: str) -> Optional[list]:
        """Get track by artist and song name
        Args:
            artist (str): The name of the artist.
            song (str): The name of the song.
        Returns:
            Optional[dict]: The track details or None if not found.
        TODO: Reimplement using StreamRip
        """
        return []

    async def get_stream_url_by_track_id(
        self, track_id: int, quality: str = "FLAC"
    ) -> Optional[str]:
        """Get stream URL by track ID
        Args:
            track_id (int): The ID of the track.
            quality (str): The quality of the stream, default is "LOSSLESS". Other options: HIGH, LOW
        Returns:
            Optional[str]: The stream URL or None if not found.
        """
        if quality not in ["FLAC", "Lossy"]:
            logging.error("Invalid quality requested: %s", quality)
            return None
        quality_int: int = int(self.streamrip_config.session.tidal.quality)
        match quality:
            case "FLAC":
                quality_int = 2
            case "Lossy":
                quality_int = 1
        track_id_str: str = str(track_id)

        await self.streamrip_client.login()

        try:
            logging.critical("Using quality_int: %s", quality_int)
            track = await self.streamrip_client.get_downloadable(
                track_id=track_id_str, quality=quality_int
            )
        except AttributeError:
            await self.streamrip_client.login()
            track = await self.streamrip_client.get_downloadable(
                track_id=track_id_str, quality=quality_int
            )
        if not track:
            logging.warning("No track found for ID: %s", track_id)
            return None
        stream_url = track.url
        if not stream_url:
            logging.warning("No stream URL found for track ID: %s", track_id)
            return None
        return stream_url

    async def get_metadata_by_track_id(self, track_id: int) -> Optional[dict]:
        """
        Fetch track + album metadata with retries, caching album data.
        Returns combined metadata dict or None after exhausting retries.
        """
        for attempt in range(1, self.MAX_METADATA_RETRIES + 1):
            try:
                await self.streamrip_client.login()
                
                # Track metadata
                metadata = await self.rate_limited_request(
                    self.streamrip_client.get_metadata, str(track_id), "track"
                )
                
                album_id = metadata.get("album", {}).get("id")
                album_metadata = None

                if album_id:
                    # Check cache first
                    if album_id in self.METADATA_ALBUM_CACHE:
                        album_metadata = self.METADATA_ALBUM_CACHE[album_id]
                    else:
                        album_metadata = await self.rate_limited_request(
                            self.streamrip_client.get_metadata, album_id, "album"
                        )
                        if not album_metadata:
                            return None
                        self.METADATA_ALBUM_CACHE[album_id] = album_metadata

                # Combine track + album metadata
                if not album_metadata:
                    return None
                combined_metadata: dict = self.combine_album_track_metadata(
                    album_metadata, metadata
                )

                logging.info(
                    "Combined metadata for track ID %s (attempt %d): %s",
                    track_id,
                    attempt,
                    combined_metadata,
                )
                return combined_metadata

            except Exception as e:
                # Exponential backoff with jitter for 429 or other errors
                delay = self.RETRY_DELAY * (2 ** (attempt - 1)) + random.uniform(0, 0.5)
                logging.warning(
                    "Metadata fetch failed for track %s (attempt %d/%d): %s. Retrying in %.2fs",
                    track_id,
                    attempt,
                    self.MAX_METADATA_RETRIES,
                    str(e),
                    delay,
                )
                if attempt < self.MAX_METADATA_RETRIES:
                    await asyncio.sleep(delay)
                else:
                    logging.error(
                        "Metadata fetch failed permanently for track %s after %d attempts",
                        track_id,
                        self.MAX_METADATA_RETRIES,
                    )
        return None


    async def download(self, track_id: int, quality: str = "LOSSLESS") -> bool | str:
        """Download track
        Args:
            track_id (int)
            quality (str): The quality of the stream, default is "LOSSLESS". Other options: HIGH, LOW
        Returns:
            bool
        """
        try:
            await self.streamrip_client.login()
            track_url = await self.get_stream_url_by_track_id(track_id)
            if not track_url:
                return False
            parsed_url = urlparse(track_url)
            parsed_url_filename = os.path.basename(parsed_url.path)
            parsed_url_ext = os.path.splitext(parsed_url_filename)[1]
            unique = hashlib.sha256(uuid4().bytes).hexdigest()[:16]
            dl_folder_path = (
                f"{self.streamrip_config.session.downloads.folder}/{unique}"
            )
            dl_path = f"{dl_folder_path}/{track_id}.{parsed_url_ext}"
            async with aiohttp.ClientSession() as session:
                async with session.get(
                    track_url, headers={}, timeout=aiohttp.ClientTimeout(total=60)
                ) as resp:
                    resp.raise_for_status()
                    with open(dl_path, "wb") as f:
                        async for chunk in resp.content.iter_chunked(1024 * 64):
                            f.write(chunk)
                    return dl_path
        except Exception as e:
            logging.critical("Error: %s", str(e))
            return False