from enum import Enum
from sqlalchemy import Column, String, Integer, Boolean, ForeignKey, JSON, Enum as SQLEnum
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import relationship, validates
from .base import Base, TimestampMixin, UUIDMixin


class MediaType(str, Enum):
    IMAGE = "image"
    VIDEO = "video"
    DOCUMENT = "document"


class MediaPurpose(str, Enum):
    BANNER = "banner"
    GALLERY = "gallery"
    ATTACHMENT = "attachment"


class EventMedia(Base, UUIDMixin, TimestampMixin):
    __tablename__ = 'event_media'

    # Foreign Keys
    event_id = Column(UUID(as_uuid=True), ForeignKey('events.id'), nullable=False)
    uploaded_by = Column(UUID(as_uuid=True), ForeignKey('users.id'), nullable=False)

    # File Information
    file_path = Column(String, nullable=False)
    original_filename = Column(String, nullable=False)
    media_type = Column(SQLEnum(MediaType), nullable=False)
    content_type = Column(String, nullable=False)
    file_size = Column(Integer, nullable=False)

    # Organization
    purpose = Column(SQLEnum(MediaPurpose), nullable=False)
    is_public = Column(Boolean, default=True, nullable=False)
    display_order = Column(Integer, default=0)
    title = Column(String)
    description = Column(String)

    # Additional Metadata
    media_metadata = Column(JSON, default=dict)

    # Relationships
    event = relationship("Event", back_populates="media")
    uploader = relationship("User", foreign_keys=[uploaded_by])

    def __repr__(self):
        return f"<EventMedia {self.original_filename} ({self.media_type.value}) for event={self.event_id}>"


    @validates('display_order')
    def validate_display_order(self, key, value):
        return value if value is not None else 0


    @property
    def is_image(self):
        return self.media_type == MediaType.IMAGE

    @property
    def is_video(self):
        return self.media_type == MediaType.VIDEO

    @property
    def is_document(self):
        return self.media_type == MediaType.DOCUMENT

    @property
    def url(self):
        """Generate the URL for the media file"""
        # This should be implemented based on your storage solution
        # Example: return f"/media/{self.file_path}"
        pass