from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Text
from sqlalchemy.orm import relationship
from datetime import datetime
from config.database import Base

class Post(Base):
    __tablename__ = "posts"
    
    id = Column(Integer, primary_key=True, index=True)
    author_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    content = Column(Text, nullable=False)
    image_url = Column(String)
    likes_count = Column(Integer, default=0)
    comments_count = Column(Integer, default=0)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    # Relationships
    author = relationship("User", back_populates="posts")
    mentions = relationship("PostMention", back_populates="post", cascade="all, delete-orphan")
    likes = relationship("PostLike", back_populates="post", cascade="all, delete-orphan")
    comments = relationship("PostComment", back_populates="post", cascade="all, delete-orphan")

class PostMention(Base):
    __tablename__ = "post_mentions"
    
    id = Column(Integer, primary_key=True, index=True)
    post_id = Column(Integer, ForeignKey("posts.id"), nullable=False)
    mentioned_user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)
    
    # Relationships
    post = relationship("Post", back_populates="mentions")
    mentioned_user = relationship("User", back_populates="mentions")

class PostLike(Base):
    __tablename__ = "post_likes"
    
    id = Column(Integer, primary_key=True, index=True)
    post_id = Column(Integer, ForeignKey("posts.id"), nullable=False)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)
    
    # Relationships
    post = relationship("Post", back_populates="likes")
    user = relationship("User", back_populates="post_likes")

class PostComment(Base):
    __tablename__ = "post_comments"
    
    id = Column(Integer, primary_key=True, index=True)
    post_id = Column(Integer, ForeignKey("posts.id"), nullable=False)
    author_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    content = Column(Text, nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    # Relationships
    post = relationship("Post", back_populates="comments")
    author = relationship("User", back_populates="post_comments")