from sqlalchemy import Column, Integer, String, Boolean, ForeignKey, DateTime, Date, Float
from sqlalchemy.orm import relationship, declarative_base
from sqlalchemy.ext.mutable import MutableDict
from sqlalchemy.dialects.postgresql import ARRAY, JSONB
from sqlalchemy.ext.mutable import MutableList
from datetime import datetime


Base = declarative_base()

# userposts table depends on username and pins as a foreign key, so we define them first here for
# it to use as a dependency, otherwise if the userposts table is attempted to be
# created first we would have tables not found error
class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True)
    username = Column(String, unique=True, index=True, nullable=False)
    email = Column(String, unique=True, index=True, nullable=False)
    hashed_password = Column(String, nullable=False)
    dob = Column(Date, nullable=False)
    country_of_origin = Column(String, nullable=False)

    followers = Column(MutableList.as_mutable(ARRAY(String)), default=[])
    following = Column(MutableList.as_mutable(ARRAY(String)), default=[])
    bio = Column(String, nullable=True)
    profile_picture = Column(String, nullable=True)

    pins = relationship("Pin", back_populates="users")
    posts = relationship("UserPost", back_populates="user", cascade="all, delete")


class Pin(Base):
    __tablename__ = "pins"

    id = Column(Integer, primary_key=True, index=True)
    pin_name = Column(String, nullable=False)
    username = Column(String, ForeignKey("users.username"), nullable=False)
    x = Column(Float, nullable=False)  # long
    y = Column(Float, nullable=False)  # lat
    description = Column(String, nullable=True)  # optional
    category = Column(String, nullable=True)  # optional
    public = Column(Boolean, default=False)
    created_at = Column(DateTime, default=datetime.utcnow)

    users = relationship("User", back_populates="pins")
    posts = relationship("UserPost", back_populates="pin", cascade="all, delete")


class UserPost(Base):
    __tablename__ = "user_posts"

    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
    username = Column(String, ForeignKey("users.username", ondelete="CASCADE"), nullable=False)
    image_url = Column(String, nullable=False)  # image as url, Amazon S3
    description = Column(String, nullable=True)
    tags = Column(String, nullable=True)
    public = Column(Boolean, default=False)
    pin_id = Column(Integer, ForeignKey("pins.id", ondelete="SET NULL"), nullable=False)
    likes = Column(Integer, default=0)
    comments = Column(MutableDict.as_mutable(JSONB), default={})
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    pin = relationship("Pin", back_populates="posts")
    user = relationship("User", back_populates="posts")