"""User Memory Service - Manages user identification, likes, and play history"""
import json
import os
import uuid
import random
from datetime import datetime
from typing import Dict, Any, List, Optional

# Get project root directory (parent of src/)
PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

# Word list for generating memorable passphrases
PASSPHRASE_WORDS = [
    # Animals
    "tiger", "eagle", "dolphin", "panda", "wolf", "fox", "bear", "hawk", "owl", "lion",
    "falcon", "phoenix", "dragon", "raven", "shark", "whale", "cobra", "jaguar", "panther",
    # Colors
    "crimson", "azure", "golden", "silver", "violet", "emerald", "coral", "amber", "jade",
    # Nature
    "storm", "river", "mountain", "ocean", "forest", "thunder", "crystal", "flame", "frost",
    "shadow", "lunar", "solar", "cosmic", "stellar", "aurora", "meadow", "canyon", "glacier",
    # Actions
    "swift", "brave", "noble", "mighty", "bold", "wild", "silent", "rapid", "fierce",
    # Music-related
    "melody", "rhythm", "harmony", "sonic", "echo", "tempo", "jazz", "blues", "rock",
    # Tech
    "cyber", "pixel", "quantum", "neon", "turbo", "nova", "spark", "laser", "pulse"
]


class UserMemoryService:
    """Service for managing user memory, likes, and play history"""
    
    def __init__(self, data_file: str = None):
        """Initialize user memory service
        
        Args:
            data_file: Path to JSON file for storing user data
        """
        self.data_file = data_file or os.path.join(PROJECT_ROOT, "user_memory.json")
        self.users: Dict[str, Dict[str, Any]] = {}
        self._load_data()
    
    def _load_data(self):
        """Load user data from file"""
        if os.path.exists(self.data_file):
            try:
                with open(self.data_file, 'r') as f:
                    self.users = json.load(f)
                print(f"✅ Loaded {len(self.users)} users from memory")
            except Exception as e:
                print(f"Error loading user memory: {e}")
                self.users = {}
        else:
            self.users = {}
    
    def _save_data(self):
        """Save user data to file"""
        try:
            with open(self.data_file, 'w') as f:
                json.dump(self.users, f, indent=2)
        except Exception as e:
            print(f"Error saving user memory: {e}")
    
    def _generate_passphrase(self, num_words: int = 3) -> str:
        """Generate a unique memorable passphrase
        
        Args:
            num_words: Number of words in passphrase (2-3)
            
        Returns:
            Unique passphrase like "swift-tiger-aurora"
        """
        max_attempts = 100
        for _ in range(max_attempts):
            words = random.sample(PASSPHRASE_WORDS, num_words)
            passphrase = "-".join(words)
            
            # Check if passphrase already exists
            if not self._passphrase_exists(passphrase):
                return passphrase
        
        # Fallback: add random number if all combinations taken
        words = random.sample(PASSPHRASE_WORDS, num_words)
        return f"{'-'.join(words)}-{random.randint(100, 999)}"
    
    def _passphrase_exists(self, passphrase: str) -> bool:
        """Check if a passphrase is already in use"""
        for user_data in self.users.values():
            if user_data.get("passphrase") == passphrase:
                return True
        return False
    
    def get_user_by_passphrase(self, passphrase: str) -> Optional[str]:
        """Find user ID by passphrase
        
        Args:
            passphrase: User's passphrase
            
        Returns:
            User ID if found, None otherwise
        """
        passphrase = passphrase.strip().lower()
        for user_id, user_data in self.users.items():
            if user_data.get("passphrase", "").lower() == passphrase:
                # Update last seen
                self.users[user_id]["last_seen"] = datetime.now().isoformat()
                self._save_data()
                print(f"✅ User authenticated via passphrase: {user_id}")
                return user_id
        return None
    
    def get_user_passphrase(self, user_id: str) -> Optional[str]:
        """Get passphrase for a user
        
        Args:
            user_id: User ID
            
        Returns:
            Passphrase if user exists, None otherwise
        """
        if user_id in self.users:
            return self.users[user_id].get("passphrase")
        return None
    
    def get_or_create_user(self, user_id: str = None) -> tuple:
        """Get existing user or create new one
        
        Args:
            user_id: Optional existing user ID
            
        Returns:
            Tuple of (user_id, passphrase, is_new_user)
        """
        if user_id and user_id in self.users:
            # Update last seen
            self.users[user_id]["last_seen"] = datetime.now().isoformat()
            self._save_data()
            passphrase = self.users[user_id].get("passphrase", "")
            return user_id, passphrase, False
        
        # Create new user with passphrase
        new_user_id = str(uuid.uuid4())[:8]  # Short ID for convenience
        passphrase = self._generate_passphrase(num_words=3)
        
        self.users[new_user_id] = {
            "created_at": datetime.now().isoformat(),
            "last_seen": datetime.now().isoformat(),
            "passphrase": passphrase,
            "preferences": {},
            "liked_tracks": [],  # List of track dicts
            "disliked_tracks": [],  # List of track identifiers (title+artist)
            "play_history": [],  # Recent play history
            "stats": {
                "total_plays": 0,
                "total_likes": 0,
                "total_dislikes": 0
            }
        }
        self._save_data()
        print(f"✅ Created new user: {new_user_id} with passphrase: {passphrase}")
        return new_user_id, passphrase, True
    
    def like_track(self, user_id: str, track: Dict[str, Any]) -> bool:
        """Like a track
        
        Args:
            user_id: User ID
            track: Track data (title, artist, url, etc.)
            
        Returns:
            Success status
        """
        if user_id not in self.users:
            return False
        
        user = self.users[user_id]
        track_id = f"{track.get('title', '')}|{track.get('artist', '')}"
        
        # Check if already liked
        existing_ids = [f"{t.get('title', '')}|{t.get('artist', '')}" for t in user["liked_tracks"]]
        if track_id in existing_ids:
            return True  # Already liked
        
        # Remove from dislikes if present
        user["disliked_tracks"] = [t for t in user["disliked_tracks"] if t != track_id]
        
        # Add to likes with timestamp
        liked_track = {
            "title": track.get("title", "Unknown"),
            "artist": track.get("artist", "Unknown"),
            "url": track.get("url", ""),
            "youtube_id": track.get("youtube_id", ""),
            "source": track.get("source", "youtube"),
            "genre": track.get("genre", ""),
            "liked_at": datetime.now().isoformat()
        }
        user["liked_tracks"].append(liked_track)
        user["stats"]["total_likes"] += 1
        
        self._save_data()
        print(f"👍 User {user_id} liked: {track.get('title', 'Unknown')}")
        return True
    
    def dislike_track(self, user_id: str, track: Dict[str, Any]) -> bool:
        """Dislike a track
        
        Args:
            user_id: User ID
            track: Track data
            
        Returns:
            Success status
        """
        if user_id not in self.users:
            return False
        
        user = self.users[user_id]
        track_id = f"{track.get('title', '')}|{track.get('artist', '')}"
        
        # Remove from likes if present
        user["liked_tracks"] = [t for t in user["liked_tracks"] 
                                if f"{t.get('title', '')}|{t.get('artist', '')}" != track_id]
        
        # Add to dislikes if not already there
        if track_id not in user["disliked_tracks"]:
            user["disliked_tracks"].append(track_id)
            user["stats"]["total_dislikes"] += 1
        
        self._save_data()
        print(f"👎 User {user_id} disliked: {track.get('title', 'Unknown')}")
        return True
    
    def add_to_history(self, user_id: str, track: Dict[str, Any]):
        """Add track to play history
        
        Args:
            user_id: User ID
            track: Track data
        """
        if user_id not in self.users:
            return
        
        user = self.users[user_id]
        
        history_entry = {
            "title": track.get("title", "Unknown"),
            "artist": track.get("artist", "Unknown"),
            "played_at": datetime.now().isoformat()
        }
        
        # Keep last 100 plays
        user["play_history"].append(history_entry)
        if len(user["play_history"]) > 100:
            user["play_history"] = user["play_history"][-100:]
        
        user["stats"]["total_plays"] += 1
        self._save_data()
    
    def get_liked_tracks(self, user_id: str) -> List[Dict[str, Any]]:
        """Get user's liked tracks
        
        Args:
            user_id: User ID
            
        Returns:
            List of liked track dicts
        """
        if user_id not in self.users:
            return []
        return self.users[user_id].get("liked_tracks", [])
    
    def get_disliked_tracks(self, user_id: str) -> List[str]:
        """Get user's disliked track identifiers
        
        Args:
            user_id: User ID
            
        Returns:
            List of disliked track identifiers (title|artist)
        """
        if user_id not in self.users:
            return []
        return self.users[user_id].get("disliked_tracks", [])
    
    def get_play_history(self, user_id: str) -> List[Dict[str, Any]]:
        """Get user's play history
        
        Args:
            user_id: User ID
            
        Returns:
            List of played track dicts
        """
        if user_id not in self.users:
            return []
        return self.users[user_id].get("play_history", [])
    
    def get_random_liked_track(self, user_id: str, genre: str = None) -> Optional[Dict[str, Any]]:
        """Get a random liked track, optionally filtered by genre
        
        Args:
            user_id: User ID
            genre: Optional genre filter
            
        Returns:
            Random liked track or None
        """
        liked = self.get_liked_tracks(user_id)
        if not liked:
            return None
        
        # Filter by genre if specified
        if genre:
            genre_lower = genre.lower()
            filtered = [t for t in liked if genre_lower in t.get("genre", "").lower()]
            if filtered:
                liked = filtered
        
        return random.choice(liked)
    
    def is_track_disliked(self, user_id: str, track: Dict[str, Any]) -> bool:
        """Check if track is disliked by user
        
        Args:
            user_id: User ID
            track: Track data
            
        Returns:
            True if disliked
        """
        if user_id not in self.users:
            return False
        
        track_id = f"{track.get('title', '')}|{track.get('artist', '')}"
        return track_id in self.users[user_id].get("disliked_tracks", [])
    
    def get_user_stats(self, user_id: str) -> Dict[str, Any]:
        """Get user statistics
        
        Args:
            user_id: User ID
            
        Returns:
            User stats dict
        """
        if user_id not in self.users:
            return {"total_plays": 0, "total_likes": 0, "total_dislikes": 0}
        return self.users[user_id].get("stats", {})
    
    def save_user_preferences(self, user_id: str, preferences: Dict[str, Any]):
        """Save user preferences
        
        Args:
            user_id: User ID
            preferences: Preferences dict
        """
        if user_id not in self.users:
            return
        
        self.users[user_id]["preferences"] = preferences
        self._save_data()
    
    def get_user_preferences(self, user_id: str) -> Dict[str, Any]:
        """Get user preferences
        
        Args:
            user_id: User ID
            
        Returns:
            Preferences dict
        """
        if user_id not in self.users:
            return {}
        return self.users[user_id].get("preferences", {})
    
    def should_play_liked_track(self, user_id: str, probability: float = 0.3) -> bool:
        """Determine if we should play a liked track based on probability
        
        Args:
            user_id: User ID
            probability: Probability of playing liked track (0.0 - 1.0)
            
        Returns:
            True if should play liked track
        """
        liked = self.get_liked_tracks(user_id)
        if not liked:
            return False
        return random.random() < probability