"""Slide model for the TV dashboard / screensaver slideshows."""

from datetime import datetime, timezone

from shopdb.api import db


def _utcnow():
    # naive UTC to match the other DB DateTime columns (stored without tzinfo)
    return datetime.now(timezone.utc).replace(tzinfo=None)


class TvSlide(db.Model):
    """One slide image in a surface's playlist.

    Image files live on disk at instance/slides/<surface>/<filename>; this row
    holds the play order + per-slide duration. Files are the source of truth for
    existence - rows whose file is gone are ignored and pruned.
    """
    __tablename__ = 'tvslides'

    slideid = db.Column(db.Integer, primary_key=True)
    surface = db.Column(db.String(20), nullable=False, index=True)
    filename = db.Column(db.String(255), nullable=False)
    sortorder = db.Column(db.Integer, default=0, nullable=False)
    seconds = db.Column(db.Integer, default=0, nullable=False)  # 0 = use default interval
    uploadeddate = db.Column(db.DateTime, default=_utcnow)

    # No DB-level unique on (surface, filename): utf8mb4 pushes that index past
    # MySQL 5.6's 767-byte limit. Upload unique-renames, so dupes can't occur.
    __table_args__ = (
        db.Index('idx_tvslide_surface', 'surface'),
    )

    def to_dict(self):
        return {
            'slideid': self.slideid,
            'surface': self.surface,
            'filename': self.filename,
            'sortorder': self.sortorder,
            'seconds': self.seconds,
        }