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 Recipe(db.Model, TimestampMixin, SoftDeleteMixin):
    """Рацион (рецепт) кормления."""

    __tablename__ = "recipe"

    id = Column(String(36), primary_key=True, default=default_uuid)
    name = Column(String(100), nullable=False)
    heads_per_trip = Column(Integer, default=1)
    mixing_time = Column(Integer, default=0)
    trip_percent = Column(Float, default=100.0)
    dry_matter_locked = Column(Boolean, nullable=False, default=False)
    unloading_link_broken = Column(Boolean, nullable=False, default=False)
    target_component_id = Column(
        String(36), ForeignKey("component.id"), nullable=True, index=True
    )
    ration_type = Column(String(10), nullable=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="")

    ingredients = relationship(
        "Ingredient",
        back_populates="recipe",
        cascade="all, delete-orphan",
        passive_deletes=True,
    )
    unloading_groups = relationship(
        "UnloadingGroup",
        back_populates="recipe",
        cascade="all, delete-orphan",
        passive_deletes=True,
    )
    trips = relationship(
        "Trip",
        back_populates="recipe",
        cascade="all, delete-orphan",
        passive_deletes=True,
    )
    period_recipes_rel = relationship(
        "PeriodRecipe",
        cascade="all, delete-orphan",
        passive_deletes=True,
        overlaps="feeding_periods",
    )


class UnloadingGroup(db.Model, TimestampMixin, SoftDeleteMixin):
    """Группа выгрузки для рецепта."""

    __tablename__ = "unloading_group"

    id = Column(String(36), primary_key=True, default=default_uuid)
    name = Column(String(100), nullable=False)
    # 'percent' или 'heads'
    distribution_type = Column(String(20), nullable=False)
    # процент или количество голов
    value = Column(Float, nullable=False)
    # вес в кг
    weight = Column(Float, nullable=True)
    # порядок выгрузки
    order = Column(Integer, nullable=False)

    recipe_id = Column(
        String(36), ForeignKey("recipe.id"), nullable=False, 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="")

    recipe = relationship("Recipe", back_populates="unloading_groups")


class PeriodRecipe(db.Model, TimestampMixin, SoftDeleteMixin):
    """Связка периода кормления и рецепта."""

    __tablename__ = "period_recipes"

    period_id = Column(
        String(36), ForeignKey("feeding_period.id"), primary_key=True
    )
    recipe_id = Column(
        String(36), ForeignKey("recipe.id"), primary_key=True, index=True
    )
    order = Column(Integer, nullable=False, default=0)

    version = Column(Integer, default=1, nullable=False)
    # created_at / updated_at — из TimestampMixin (БД: NOT NULL у обоих)
    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="")