from .extensions import db
from datetime import datetime, date, timezone


class Project(db.Model):
    __tablename__ = 'projects'

    id          = db.Column(db.Integer, primary_key=True)
    name        = db.Column(db.String(200), nullable=False)
    color       = db.Column(db.String(7), nullable=False, default='#C9A84C')
    description = db.Column(db.Text)
    drive_url   = db.Column(db.String(500))
    archived_at = db.Column(db.DateTime, nullable=True)
    created_at  = db.Column(db.DateTime, default=lambda: datetime.now(timezone.utc))

    deliverables = db.relationship(
        'Deliverable',
        backref='project',
        cascade='all, delete-orphan',
        lazy=True,
    )

    def to_dict(self, include_deliverables=True):
        data = {
            'id':          self.id,
            'name':        self.name,
            'color':       self.color,
            'description': self.description,
            'drive_url':   self.drive_url,
            'archived_at': self.archived_at.isoformat() if self.archived_at else None,
            'created_at':  self.created_at.isoformat() if self.created_at else None,
        }
        if include_deliverables:
            data['deliverables'] = [
                d.to_dict() for d in sorted(self.deliverables, key=lambda x: x.due_date)
            ]
        return data


class Deliverable(db.Model):
    __tablename__ = 'deliverables'

    id         = db.Column(db.Integer, primary_key=True)
    project_id = db.Column(
        db.Integer,
        db.ForeignKey('projects.id', ondelete='CASCADE'),
        nullable=False,
    )
    title      = db.Column(db.String(300), nullable=False)
    due_date   = db.Column(db.Date, nullable=False)
    status     = db.Column(db.String(20), nullable=False, default='upcoming')
    created_at = db.Column(db.DateTime, default=lambda: datetime.now(timezone.utc))

    def effective_status(self):
        """
        Returns 'overdue' if the due date has passed and the deliverable has not been
        marked completed. Completed deliverables are never auto-downgraded.
        """
        if self.status != 'completed' and self.due_date < date.today():
            return 'overdue'
        return self.status

    def to_dict(self):
        return {
            'id':         self.id,
            'project_id': self.project_id,
            'title':      self.title,
            'due_date':   self.due_date.isoformat() if self.due_date else None,
            'status':     self.effective_status(),
            'created_at': self.created_at.isoformat() if self.created_at else None,
        }