from sqlalchemy import Boolean, Column, DateTime, Float, ForeignKey, Integer, String
from sqlalchemy.orm import relationship

from app import db
from .base import SoftDeleteMixin, TimestampMixin, default_uuid


class Component(db.Model, TimestampMixin, SoftDeleteMixin):
    """Кормовой компонент (ингредиент как сущность склада/рецептов)."""

    __tablename__ = "component"

    id = Column(String(36), primary_key=True, default=default_uuid)
    name = Column(String(100), nullable=False)
    type = Column(String(100), nullable=False, default="")
    is_active = Column(Boolean, default=True)
    dry_matter = Column(Float, nullable=False, default=0.0)
    protein = Column(Float, nullable=False, default=0.0)
    energy = Column(Float, nullable=False, default=0.0)
    price = Column(Float, nullable=False, default=0.0)
    external_no = Column(Integer, nullable=True, index=True)

    # Версионирование и аудит (минимальный набор для синхронизации)
    version = Column(Integer, default=1, nullable=False)
    created_by = Column(String(50), nullable=False, default="system")
    updated_by = Column(String(50), nullable=False, default="system")
    sync_timestamp = Column(DateTime, nullable=True)
    sync_status = Column(String(20), default="pending", nullable=False)
    content_hash = Column(String(64), nullable=False, default="")

    # Связи
    ingredients = relationship(
        "Ingredient",
        back_populates="component",
        cascade="all, delete-orphan",
        passive_deletes=True,
    )


class Ingredient(db.Model, TimestampMixin, SoftDeleteMixin):
    """Строка рецепта (ингредиент в составе рецепта)."""

    __tablename__ = "ingredient"

    id = Column(String(36), primary_key=True, default=default_uuid)
    name = Column(String(100), nullable=False)
    amount = Column(Float, nullable=False)
    # Новое поле в легаси: вес на голову
    weight_per_head = Column(Float, nullable=True)
    # Процент сухого вещества
    dry_matter = Column(Float, nullable=False, default=0.0)
    # СВ на голову (кг) - константа для режима "замок СВ"
    dry_matter_per_head = Column(Float, nullable=True)
    # Порядок ингредиента в рецепте
    order = Column(Integer, nullable=False, default=0)

    recipe_id = Column(String(36), ForeignKey("recipe.id"), nullable=False, index=True)
    component_id = Column(
        String(36), ForeignKey("component.id"), nullable=True, index=True
    )

    version = Column(Integer, default=1, nullable=False)
    created_by = Column(String(50), nullable=False, default="system")
    updated_by = Column(String(50), nullable=False, default="system")
    sync_timestamp = Column(DateTime, nullable=True)
    sync_status = Column(String(20), default="pending", nullable=False)
    content_hash = Column(String(64), nullable=False, default="")

    # Связи
    recipe = relationship("Recipe", back_populates="ingredients")
    component = relationship("Component", back_populates="ingredients")