"""
Content models with async support and enhanced features
"""
import hashlib
import mimetypes
from datetime import datetime, timedelta
from enum import Enum
from pathlib import Path
from typing import Optional, List, Dict, Any, Union
from urllib.parse import urljoin

from sqlalchemy import Column, String, Integer, BigInteger, Boolean, Text, ForeignKey, Index, text, DateTime
from sqlalchemy.dialects.postgresql import JSONB, ARRAY
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy.future import select
from sqlalchemy.orm import relationship
import structlog

from app.core.models.base import BaseModel
from app.core.config import settings, PROJECT_HOST

logger = structlog.get_logger(__name__)


class ContentType(str, Enum):
    """Content type enumeration"""
    AUDIO = "audio"
    VIDEO = "video"
    IMAGE = "image"
    TEXT = "text"
    DOCUMENT = "document"
    UNKNOWN = "unknown"


class ContentStatus(str, Enum):
    """Content status enumeration"""
    UPLOADING = "uploading"
    PROCESSING = "processing"
    READY = "ready"
    FAILED = "failed"
    DISABLED = "disabled"
    DELETED = "deleted"


class StorageType(str, Enum):
    """Storage type enumeration"""
    LOCAL = "local"
    ONCHAIN = "onchain"
    IPFS = "ipfs"
    HYBRID = "hybrid"


class LicenseType(str, Enum):
    """License type enumeration"""
    LISTEN = "listen"
    USE = "use"
    RESALE = "resale"
    EXCLUSIVE = "exclusive"


class StoredContent(BaseModel):
    """Enhanced content storage model"""
    
    __tablename__ = 'my_network_content'
    
    # Content identification
    hash = Column(
        String(128),
        nullable=False,
        unique=True,
        index=True,
        comment="Content hash (SHA-256 or custom)"
    )
    content_id = Column(
        String(256),
        nullable=True,
        index=True,
        comment="Content identifier (CID for IPFS)"
    )
    
    # File information
    filename = Column(
        String(512),
        nullable=False,
        comment="Original filename"
    )
    file_size = Column(
        BigInteger,
        nullable=False,
        default=0,
        comment="File size in bytes"
    )
    mime_type = Column(
        String(128),
        nullable=True,
        comment="MIME type of the content"
    )
    
    # Content type and storage
    content_type = Column(
        String(32),
        nullable=False,
        default=ContentType.UNKNOWN.value,
        index=True,
        comment="Content type category"
    )
    storage_type = Column(
        String(32),
        nullable=False,
        default=StorageType.LOCAL.value,
        index=True,
        comment="Storage type"
    )
    
    # File path and URLs
    file_path = Column(
        String(1024),
        nullable=True,
        comment="Local file path"
    )
    external_url = Column(
        String(2048),
        nullable=True,
        comment="External URL for remote content"
    )
    
    # Blockchain related
    onchain_index = Column(
        Integer,
        nullable=True,
        index=True,
        comment="On-chain index number"
    )
    owner_address = Column(
        String(256),
        nullable=True,
        index=True,
        comment="Blockchain owner address"
    )
    
    # User and access
    user_id = Column(
        String(36),  # UUID
        ForeignKey('users.id'),
        nullable=True,
        index=True,
        comment="User who uploaded the content"
    )
    
    # Encryption and security
    encrypted = Column(
        Boolean,
        nullable=False,
        default=False,
        comment="Whether content is encrypted"
    )
    encryption_key_id = Column(
        String(36),  # UUID
        ForeignKey('encryption_keys.id'),
        nullable=True,
        comment="Encryption key reference"
    )
    
    # Processing status
    disabled = Column(
        Boolean,
        nullable=False,
        default=False,
        index=True,
        comment="Whether content is disabled"
    )
    
    # Content metadata
    title = Column(
        String(512),
        nullable=True,
        comment="Content title"
    )
    description = Column(
        Text,
        nullable=True,
        comment="Content description"
    )
    tags = Column(
        ARRAY(String),
        nullable=False,
        default=list,
        comment="Content tags"
    )
    
    # Media-specific metadata
    duration = Column(
        Integer,
        nullable=True,
        comment="Duration in seconds (for audio/video)"
    )
    width = Column(
        Integer,
        nullable=True,
        comment="Width in pixels (for images/video)"
    )
    height = Column(
        Integer,
        nullable=True,
        comment="Height in pixels (for images/video)"
    )
    bitrate = Column(
        Integer,
        nullable=True,
        comment="Bitrate (for audio/video)"
    )
    
    # Conversion and processing
    processing_status = Column(
        String(32),
        nullable=False,
        default=ContentStatus.READY.value,
        index=True,
        comment="Processing status"
    )
    conversion_data = Column(
        JSONB,
        nullable=False,
        default=dict,
        comment="Conversion and processing data"
    )
    
    # Statistics
    download_count = Column(
        Integer,
        nullable=False,
        default=0,
        comment="Number of downloads"
    )
    view_count = Column(
        Integer,
        nullable=False,
        default=0,
        comment="Number of views"
    )
    
    # Relationships
    user = relationship('User', back_populates='content_items')
    encryption_key = relationship('EncryptionKey', back_populates='content_items')
    user_contents = relationship('UserContent', back_populates='content')
    user_actions = relationship('UserAction', back_populates='content')
    
    # Indexes for performance
    __table_args__ = (
        Index('idx_content_hash', 'hash'),
        Index('idx_content_user_type', 'user_id', 'content_type'),
        Index('idx_content_storage_status', 'storage_type', 'status'),
        Index('idx_content_onchain', 'onchain_index'),
        Index('idx_content_created', 'created_at'),
        Index('idx_content_disabled', 'disabled'),
    )
    
    def __str__(self) -> str:
        """String representation"""
        return f"StoredContent({self.id}, hash={self.hash[:8]}..., filename={self.filename})"
    
    @property
    def file_extension(self) -> str:
        """Get file extension"""
        return Path(self.filename).suffix.lower()
    
    @property
    def web_url(self) -> str:
        """Get web accessible URL"""
        if self.external_url:
            return self.external_url
        if self.hash:
            return urljoin(str(PROJECT_HOST), f"/api/v1.5/storage/{self.hash}")
        return ""
    
    @property
    def download_url(self) -> str:
        """Get download URL"""
        if self.hash:
            return urljoin(str(PROJECT_HOST), f"/api/v1/storage/{self.hash}")
        return ""
    
    @property
    def is_media(self) -> bool:
        """Check if content is media (audio/video/image)"""
        return self.content_type in [ContentType.AUDIO, ContentType.VIDEO, ContentType.IMAGE]
    
    @property
    def is_processed(self) -> bool:
        """Check if content is fully processed"""
        return self.processing_status == ContentStatus.READY.value
    
    @property
    def cache_key(self) -> str:
        """Override cache key to use hash"""
        return f"content:hash:{self.hash}"
    
    def detect_content_type(self) -> ContentType:
        """Detect content type from MIME type"""
        if not self.mime_type:
            # Try to guess from extension
            mime_type, _ = mimetypes.guess_type(self.filename)
            self.mime_type = mime_type
        
        if self.mime_type:
            if self.mime_type.startswith('audio/'):
                return ContentType.AUDIO
            elif self.mime_type.startswith('video/'):
                return ContentType.VIDEO
            elif self.mime_type.startswith('image/'):
                return ContentType.IMAGE
            elif self.mime_type.startswith('text/'):
                return ContentType.TEXT
            elif 'application/' in self.mime_type:
                return ContentType.DOCUMENT
        
        return ContentType.UNKNOWN
    
    def calculate_hash(self, file_data: bytes) -> str:
        """Calculate hash for file data"""
        return hashlib.sha256(file_data).hexdigest()
    
    def set_conversion_data(self, key: str, value: Any) -> None:
        """Set conversion data"""
        if not self.conversion_data:
            self.conversion_data = {}
        self.conversion_data[key] = value
    
    def get_conversion_data(self, key: str, default: Any = None) -> Any:
        """Get conversion data"""
        if not self.conversion_data:
            return default
        return self.conversion_data.get(key, default)
    
    def add_tag(self, tag: str) -> None:
        """Add tag to content"""
        if not self.tags:
            self.tags = []
        tag = tag.strip().lower()
        if tag and tag not in self.tags:
            self.tags.append(tag)
    
    def remove_tag(self, tag: str) -> None:
        """Remove tag from content"""
        if self.tags:
            tag = tag.strip().lower()
            if tag in self.tags:
                self.tags.remove(tag)
    
    def increment_download_count(self) -> None:
        """Increment download counter"""
        self.download_count += 1
    
    def increment_view_count(self) -> None:
        """Increment view counter"""
        self.view_count += 1
    
    @classmethod
    async def get_by_hash(
        cls, 
        session: AsyncSession, 
        content_hash: str
    ) -> Optional['StoredContent']:
        """Get content by hash"""
        try:
            stmt = select(cls).where(cls.hash == content_hash)
            result = await session.execute(stmt)
            return result.scalar_one_or_none()
        except Exception as e:
            logger.error("Error getting content by hash", hash=content_hash, error=str(e))
            return None
    
    @classmethod
    async def get_by_user(
        cls,
        session: AsyncSession,
        user_id: str,
        content_type: Optional[ContentType] = None,
        limit: Optional[int] = None,
        offset: Optional[int] = None
    ) -> List['StoredContent']:
        """Get content by user"""
        try:
            stmt = select(cls).where(cls.user_id == user_id)
            
            if content_type:
                stmt = stmt.where(cls.content_type == content_type.value)
            
            stmt = stmt.order_by(cls.created_at.desc())
            
            if offset:
                stmt = stmt.offset(offset)
            if limit:
                stmt = stmt.limit(limit)
            
            result = await session.execute(stmt)
            return result.scalars().all()
        except Exception as e:
            logger.error("Error getting content by user", user_id=user_id, error=str(e))
            return []
    
    @classmethod
    async def get_recent(
        cls,
        session: AsyncSession,
        days: int = 7,
        content_type: Optional[ContentType] = None,
        limit: Optional[int] = None
    ) -> List['StoredContent']:
        """Get recent content"""
        try:
            cutoff_date = datetime.utcnow() - timedelta(days=days)
            stmt = select(cls).where(
                cls.created_at >= cutoff_date,
                cls.disabled == False,
                cls.processing_status == ContentStatus.READY.value
            )
            
            if content_type:
                stmt = stmt.where(cls.content_type == content_type.value)
            
            stmt = stmt.order_by(cls.created_at.desc())
            
            if limit:
                stmt = stmt.limit(limit)
            
            result = await session.execute(stmt)
            return result.scalars().all()
        except Exception as e:
            logger.error("Error getting recent content", days=days, error=str(e))
            return []
    
    @classmethod
    async def search(
        cls,
        session: AsyncSession,
        query: str,
        content_type: Optional[ContentType] = None,
        limit: Optional[int] = None,
        offset: Optional[int] = None
    ) -> List['StoredContent']:
        """Search content by title and description"""
        try:
            search_pattern = f"%{query.lower()}%"
            stmt = select(cls).where(
                (cls.title.ilike(search_pattern)) |
                (cls.description.ilike(search_pattern)) |
                (cls.filename.ilike(search_pattern)),
                cls.disabled == False,
                cls.processing_status == ContentStatus.READY.value
            )
            
            if content_type:
                stmt = stmt.where(cls.content_type == content_type.value)
            
            stmt = stmt.order_by(cls.created_at.desc())
            
            if offset:
                stmt = stmt.offset(offset)
            if limit:
                stmt = stmt.limit(limit)
            
            result = await session.execute(stmt)
            return result.scalars().all()
        except Exception as e:
            logger.error("Error searching content", query=query, error=str(e))
            return []
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary with additional computed fields"""
        data = super().to_dict()
        data.update({
            'web_url': self.web_url,
            'download_url': self.download_url,
            'file_extension': self.file_extension,
            'is_media': self.is_media,
            'is_processed': self.is_processed
        })
        return data


class UserContent(BaseModel):
    """User content ownership and licensing"""
    
    __tablename__ = 'user_content'
    
    # Content relationship
    content_id = Column(
        String(36),  # UUID
        ForeignKey('my_network_content.id'),
        nullable=False,
        index=True,
        comment="Reference to stored content"
    )
    user_id = Column(
        String(36),  # UUID
        ForeignKey('users.id'),
        nullable=False,
        index=True,
        comment="User who owns this content"
    )
    
    # License information
    license_type = Column(
        String(32),
        nullable=False,
        default=LicenseType.LISTEN.value,
        comment="Type of license"
    )
    
    # Blockchain data
    onchain_address = Column(
        String(256),
        nullable=True,
        index=True,
        comment="On-chain contract address"
    )
    owner_address = Column(
        String(256),
        nullable=True,
        index=True,
        comment="Blockchain owner address"
    )
    
    # Transaction data
    purchase_transaction = Column(
        String(128),
        nullable=True,
        comment="Purchase transaction hash"
    )
    purchase_amount = Column(
        BigInteger,
        nullable=True,
        comment="Purchase amount in minimal units"
    )
    
    # Wallet connection
    wallet_connection_id = Column(
        String(36),  # UUID
        ForeignKey('wallet_connections.id'),
        nullable=True,
        comment="Wallet connection used for purchase"
    )
    
    # Access control
    access_granted = Column(
        Boolean,
        nullable=False,
        default=False,
        comment="Whether access is granted"
    )
    access_expires_at = Column(
        DateTime,
        nullable=True,
        comment="When access expires (for temporary licenses)"
    )
    
    # Usage tracking
    download_count = Column(
        Integer,
        nullable=False,
        default=0,
        comment="Number of downloads by this user"
    )
    last_accessed = Column(
        DateTime,
        nullable=True,
        comment="Last access timestamp"
    )
    
    # Relationships
    user = relationship('User', back_populates='content_items')
    content = relationship('StoredContent', back_populates='user_contents')
    wallet_connection = relationship('WalletConnection', back_populates='user_contents')
    
    # Indexes
    __table_args__ = (
        Index('idx_user_content_user', 'user_id'),
        Index('idx_user_content_content', 'content_id'),
        Index('idx_user_content_onchain', 'onchain_address'),
        Index('idx_user_content_owner', 'owner_address'),
        Index('idx_user_content_status', 'status'),
    )
    
    def __str__(self) -> str:
        """String representation"""
        return f"UserContent({self.id}, user={self.user_id}, content={self.content_id})"
    
    @property
    def is_expired(self) -> bool:
        """Check if access has expired"""
        if not self.access_expires_at:
            return False
        return datetime.utcnow() > self.access_expires_at
    
    @property
    def is_accessible(self) -> bool:
        """Check if content is accessible"""
        return self.access_granted and not self.is_expired and self.status == 'active'
    
    def grant_access(self, expires_at: Optional[datetime] = None) -> None:
        """Grant access to content"""
        self.access_granted = True
        self.access_expires_at = expires_at
        self.last_accessed = datetime.utcnow()
    
    def revoke_access(self) -> None:
        """Revoke access to content"""
        self.access_granted = False
    
    def record_download(self) -> None:
        """Record a download"""
        self.download_count += 1
        self.last_accessed = datetime.utcnow()
    
    @classmethod
    async def get_user_access(
        cls,
        session: AsyncSession,
        user_id: str,
        content_id: str
    ) -> Optional['UserContent']:
        """Get user access to specific content"""
        try:
            stmt = select(cls).where(
                cls.user_id == user_id,
                cls.content_id == content_id,
                cls.status == 'active'
            )
            result = await session.execute(stmt)
            return result.scalar_one_or_none()
        except Exception as e:
            logger.error("Error getting user access", user_id=user_id, content_id=content_id, error=str(e))
            return None
    
    @classmethod
    async def get_user_content(
        cls,
        session: AsyncSession,
        user_id: str,
        limit: Optional[int] = None,
        offset: Optional[int] = None
    ) -> List['UserContent']:
        """Get all content accessible by user"""
        try:
            stmt = select(cls).where(
                cls.user_id == user_id,
                cls.status == 'active',
                cls.access_granted == True
            ).order_by(cls.created_at.desc())
            
            if offset:
                stmt = stmt.offset(offset)
            if limit:
                stmt = stmt.limit(limit)
            
            result = await session.execute(stmt)
            return result.scalars().all()
        except Exception as e:
            logger.error("Error getting user content", user_id=user_id, error=str(e))
            return []


class EncryptionKey(BaseModel):
    """Encryption key management"""
    
    __tablename__ = 'encryption_keys'
    
    # Key identification
    key_hash = Column(
        String(128),
        nullable=False,
        unique=True,
        index=True,
        comment="Hash of the encryption key"
    )
    algorithm = Column(
        String(32),
        nullable=False,
        default="AES-256-GCM",
        comment="Encryption algorithm used"
    )
    
    # Key metadata
    purpose = Column(
        String(64),
        nullable=False,
        comment="Purpose of the key (content, user_data, etc.)"
    )
    
    # Access control
    owner_id = Column(
        String(36),  # UUID
        ForeignKey('users.id'),
        nullable=True,
        comment="Key owner (if user-specific)"
    )
    
    # Key lifecycle
    expires_at = Column(
        DateTime,
        nullable=True,
        comment="Key expiration timestamp"
    )
    revoked_at = Column(
        DateTime,
        nullable=True,
        comment="Key revocation timestamp"
    )
    
    # Relationships
    owner = relationship('User', back_populates='encryption_keys')
    content_items = relationship('StoredContent', back_populates='encryption_key')
    
    def __str__(self) -> str:
        """String representation"""
        return f"EncryptionKey({self.id}, hash={self.key_hash[:8]}...)"
    
    @property
    def is_valid(self) -> bool:
        """Check if key is valid (not expired or revoked)"""
        now = datetime.utcnow()
        if self.revoked_at and self.revoked_at <= now:
            return False
        if self.expires_at and self.expires_at <= now:
            return False
        return True
    
    def revoke(self) -> None:
        """Revoke the key"""
        self.revoked_at = datetime.utcnow()


# Backward compatibility aliases
Content = StoredContent


class ContentChunk(BaseModel):
    """Content chunk for large file uploads"""
    
    __tablename__ = 'content_chunks'
    
    # Chunk identification
    content_id = Column(
        String(36),  # UUID
        ForeignKey('my_network_content.id'),
        nullable=False,
        index=True,
        comment="Parent content ID"
    )
    chunk_index = Column(
        Integer,
        nullable=False,
        comment="Chunk sequence number"
    )
    chunk_hash = Column(
        String(128),
        nullable=False,
        index=True,
        comment="Hash of this chunk"
    )
    
    # Chunk data
    chunk_size = Column(
        Integer,
        nullable=False,
        comment="Size of this chunk in bytes"
    )
    chunk_data = Column(
        Text,
        nullable=True,
        comment="Base64 encoded chunk data (for small chunks)"
    )
    file_path = Column(
        String(1024),
        nullable=True,
        comment="Path to chunk file (for large chunks)"
    )
    
    # Upload status
    uploaded = Column(
        Boolean,
        nullable=False,
        default=False,
        comment="Whether chunk is uploaded"
    )
    
    # Relationships
    content = relationship('StoredContent', back_populates='chunks')
    
    def __str__(self) -> str:
        return f"ContentChunk({self.id}, content={self.content_id}, index={self.chunk_index})"


class FileUpload(BaseModel):
    """File upload session tracking"""
    
    __tablename__ = 'file_uploads'
    
    # Upload identification
    upload_id = Column(
        String(128),
        nullable=False,
        unique=True,
        index=True,
        comment="Unique upload session ID"
    )
    filename = Column(
        String(512),
        nullable=False,
        comment="Original filename"
    )
    
    # Upload metadata
    total_size = Column(
        BigInteger,
        nullable=False,
        comment="Total file size in bytes"
    )
    uploaded_size = Column(
        BigInteger,
        nullable=False,
        default=0,
        comment="Uploaded size in bytes"
    )
    chunk_size = Column(
        Integer,
        nullable=False,
        default=1048576,  # 1MB
        comment="Chunk size in bytes"
    )
    total_chunks = Column(
        Integer,
        nullable=False,
        comment="Total number of chunks"
    )
    uploaded_chunks = Column(
        Integer,
        nullable=False,
        default=0,
        comment="Number of uploaded chunks"
    )
    
    # Upload status
    upload_status = Column(
        String(32),
        nullable=False,
        default='pending',
        comment="Upload status"
    )
    
    # User information
    user_id = Column(
        String(36),  # UUID
        ForeignKey('users.id'),
        nullable=True,
        index=True,
        comment="User performing the upload"
    )
    
    # Completion
    content_id = Column(
        String(36),  # UUID
        ForeignKey('my_network_content.id'),
        nullable=True,
        comment="Final content ID after completion"
    )
    
    # Relationships
    user = relationship('User', back_populates='file_uploads')
    content = relationship('StoredContent', back_populates='file_upload')
    
    def __str__(self) -> str:
        return f"FileUpload({self.id}, upload_id={self.upload_id}, status={self.upload_status})"
    
    @property
    def progress_percentage(self) -> float:
        """Get upload progress percentage"""
        if self.total_size == 0:
            return 0.0
        return (self.uploaded_size / self.total_size) * 100.0
    
    @property
    def is_complete(self) -> bool:
        """Check if upload is complete"""
        return self.uploaded_size >= self.total_size and self.upload_status == 'completed'
    
    def update_progress(self, chunk_size: int) -> None:
        """Update upload progress"""
        self.uploaded_size += chunk_size
        self.uploaded_chunks += 1
        
        if self.uploaded_size >= self.total_size:
            self.upload_status = 'completed'
        elif self.upload_status == 'pending':
            self.upload_status = 'uploading'


# Update relationships in StoredContent
StoredContent.chunks = relationship('ContentChunk', back_populates='content')
StoredContent.file_upload = relationship('FileUpload', back_populates='content', uselist=False)