"""Knowledge Base models."""

from shopdb.extensions import db
from .base import BaseModel


class KnowledgeBase(BaseModel):
    """Knowledge Base article linking to external resources."""
    __tablename__ = 'knowledgebase'

    linkid = db.Column(db.Integer, primary_key=True)
    appid = db.Column(db.Integer, db.ForeignKey('applications.appid'))
    shortdescription = db.Column(db.String(500), nullable=False)
    linkurl = db.Column(db.String(2000))
    keywords = db.Column(db.String(500))
    clicks = db.Column(db.Integer, default=0)
    lastupdated = db.Column(db.DateTime, default=db.func.now(), onupdate=db.func.now())

    # Relationships
    application = db.relationship('Application', backref=db.backref('knowledgebase_articles', lazy='dynamic'))

    def __repr__(self):
        return f"<KnowledgeBase {self.linkid}: {self.shortdescription[:50] if self.shortdescription else 'No desc'}>"

    def increment_clicks(self):
        """Increment click counter."""
        self.clicks = (self.clicks or 0) + 1