from sqlalchemy import (
    Column,
    String,
    Date,
    Boolean,
    ForeignKey,
    Table,
    UniqueConstraint,
)
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import relationship
import uuid

from backend.database import Base

# Association table for Item <-> Tag
item_tag_table = Table(
    "item_tag",
    Base.metadata,
    Column("item_id", UUID(as_uuid=True), ForeignKey("item.id", ondelete="CASCADE"), primary_key=True),
    Column("tag_id", UUID(as_uuid=True), ForeignKey("tag.id", ondelete="CASCADE"), primary_key=True),
)

# Association tables for Trip <-> Tag
trip_selected_tag_table = Table(
    "trip_selected_tag",
    Base.metadata,
    Column("trip_id", UUID(as_uuid=True), ForeignKey("trip.id", ondelete="CASCADE"), primary_key=True),
    Column("tag_id", UUID(as_uuid=True), ForeignKey("tag.id", ondelete="CASCADE"), primary_key=True),
)

trip_marked_tag_table = Table(
    "trip_marked_tag",
    Base.metadata,
    Column("trip_id", UUID(as_uuid=True), ForeignKey("trip.id", ondelete="CASCADE"), primary_key=True),
    Column("tag_id", UUID(as_uuid=True), ForeignKey("tag.id", ondelete="CASCADE"), primary_key=True),
)


class User(Base):
    __tablename__ = "user"
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name = Column(String, nullable=False)


class Tag(Base):
    __tablename__ = "tag"
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(UUID(as_uuid=True), ForeignKey("user.id", ondelete="CASCADE"), nullable=False)
    name = Column(String, nullable=False)
    mandatory = Column(Boolean, nullable=False, default=False)

    user = relationship("User", backref="tags")

    __table_args__ = (
        UniqueConstraint("user_id", "name", name="uq_tag_user_name"),
    )


class Item(Base):
    __tablename__ = "item"
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(UUID(as_uuid=True), ForeignKey("user.id", ondelete="CASCADE"), nullable=False)
    name = Column(String, nullable=False)

    user = relationship("User", backref="items")
    tags = relationship("Tag", secondary=item_tag_table, backref="items")
    trip_items = relationship("TripItem", back_populates="item", cascade="all, delete-orphan")


class Trip(Base):
    __tablename__ = "trip"
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(UUID(as_uuid=True), ForeignKey("user.id", ondelete="CASCADE"), nullable=False)
    name = Column(String, nullable=True)
    start_date = Column(Date, nullable=False)
    end_date = Column(Date, nullable=False)

    selected_tags = relationship("Tag", secondary=trip_selected_tag_table, backref="selected_in_trips", cascade="all, delete")
    marked_tags = relationship("Tag", secondary=trip_marked_tag_table, backref="marked_in_trips", cascade="all, delete")


class TripItem(Base):
    __tablename__ = "trip_item"
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    trip_id = Column(UUID(as_uuid=True), ForeignKey("trip.id", ondelete="CASCADE"), nullable=False)
    item_id = Column(UUID(as_uuid=True), ForeignKey("item.id", ondelete="CASCADE"), nullable=False)
    name_calculated = Column(String, nullable=False)
    checked = Column(Boolean, nullable=False, default=False)
    tag_id = Column(UUID(as_uuid=True), ForeignKey("tag.id"), nullable=True)

    trip = relationship("Trip", backref="trip_items")
    item = relationship("Item", back_populates="trip_items")
    tag = relationship("Tag", backref="trip_items")