from datetime import datetime
from app import db

class GrowLog(db.Model):
    __tablename__ = "grow_logs"
    __table_args__ = {"extend_existing": True}

    id         = db.Column(db.Integer, primary_key=True)
    plant_id   = db.Column(db.Integer, db.ForeignKey("plant.id"), nullable=False)
    title      = db.Column(db.String(255), nullable=True)
    notes      = db.Column(db.Text,      nullable=True)
    is_public  = db.Column(db.Boolean,   default=False, nullable=False)
    created_at = db.Column(db.DateTime,  default=datetime.utcnow, nullable=False)
    updated_at = db.Column(
        db.DateTime,
        default=datetime.utcnow,
        onupdate=datetime.utcnow,
        nullable=False
    )

    # ↔ images uploaded directly to this GrowLog
    media_items = db.relationship(
        "plugins.media.models.Media",
        back_populates="growlog",
        foreign_keys="plugins.media.models.Media.growlog_id",
        lazy="dynamic",
        cascade="all, delete-orphan",
    )

    # ↔ child updates
    updates = db.relationship(
        "plugins.growlog.models.PlantUpdate",
        back_populates="growlog",
        foreign_keys="plugins.growlog.models.PlantUpdate.growlog_id",
        lazy="dynamic",
        cascade="all, delete-orphan",
    )


class PlantUpdate(db.Model):
    __tablename__ = "plant_updates"
    __table_args__ = {"extend_existing": True}

    id          = db.Column(db.Integer, primary_key=True)
    growlog_id  = db.Column(db.Integer, db.ForeignKey("grow_logs.id"), nullable=False)
    description = db.Column(db.Text,    nullable=True)
    created_at  = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)

    # ↔ parent GrowLog.updates
    growlog = db.relationship(
        "plugins.growlog.models.GrowLog",
        back_populates="updates",
        foreign_keys=[growlog_id],
        lazy="joined",
    )

    # ↔ images attached via UpdateImage join table
    media_items = db.relationship(
        "plugins.growlog.models.UpdateImage",
        back_populates="update",
        foreign_keys="plugins.growlog.models.UpdateImage.update_id",
        lazy="dynamic",
        cascade="all, delete-orphan",
    )


class UpdateImage(db.Model):
    __tablename__ = "update_images"
    __table_args__ = {"extend_existing": True}

    id         = db.Column(db.Integer, primary_key=True)
    update_id  = db.Column(db.Integer, db.ForeignKey("plant_updates.id"), nullable=False)
    media_id   = db.Column(db.Integer, db.ForeignKey("media.id"),          nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow,          nullable=False)

    # ↔ PlantUpdate.media_items
    update = db.relationship(
        "plugins.growlog.models.PlantUpdate",
        back_populates="media_items",
        foreign_keys=[update_id],
        lazy="joined",
    )

    # ↔ the actual Media record
    media = db.relationship(
        "plugins.media.models.Media",
        backref=db.backref("update_images", lazy="dynamic"),
        foreign_keys=[media_id],
        lazy="joined",
    )