from collections import defaultdict

from sqlalchemy import ForeignKey
from sqlalchemy.orm import Mapped, mapped_column, relationship

from ttfrog.db.base import BaseObject, SavingThrowsMixin, SkillsMixin

__all__ = [
    "ClassAttributeMap",
    "ClassAttribute",
    "ClassAttributeOption",
    "CharacterClass",
]


class ClassAttributeMap(BaseObject):
    __tablename__ = "class_attribute_map"
    class_attribute_id: Mapped[int] = mapped_column(ForeignKey("class_attribute.id"), primary_key=True)
    character_class_id: Mapped[int] = mapped_column(ForeignKey("character_class.id"), primary_key=True)
    level: Mapped[int] = mapped_column(nullable=False, info={"min": 1, "max": 20}, default=1)
    attribute = relationship("ClassAttribute", uselist=False, viewonly=True, lazy="immediate")


class ClassAttribute(BaseObject):
    __tablename__ = "class_attribute"
    id: Mapped[int] = mapped_column(init=False, primary_key=True, autoincrement=True)
    name: Mapped[str] = mapped_column(nullable=False)
    options = relationship("ClassAttributeOption", cascade="all,delete,delete-orphan", lazy="immediate")

    def __repr__(self):
        return f"{self.id}: {self.name}"


class ClassAttributeOption(BaseObject):
    __tablename__ = "class_attribute_option"
    id: Mapped[int] = mapped_column(init=False, primary_key=True, autoincrement=True)
    name: Mapped[str] = mapped_column(nullable=False)
    attribute_id: Mapped[int] = mapped_column(ForeignKey("class_attribute.id"), nullable=False)


class CharacterClass(BaseObject, SavingThrowsMixin, SkillsMixin):
    __tablename__ = "character_class"
    id: Mapped[int] = mapped_column(init=False, primary_key=True, autoincrement=True)
    name: Mapped[str] = mapped_column(index=True, unique=True)
    hit_dice: Mapped[str] = mapped_column(default="1d6")
    hit_dice_stat: Mapped[str] = mapped_column(default="")
    proficiencies: Mapped[str] = mapped_column(default="")
    attributes = relationship("ClassAttributeMap", cascade="all,delete,delete-orphan", lazy="immediate")

    @property
    def attributes_by_level(self):
        by_level = defaultdict(list)
        for mapping in self.attributes:
            by_level[mapping.level] = {mapping.attribute.name: mapping.attribute}
        return by_level