from main import db, app, ma
from sqlalchemy import Sequence
from sqlalchemy.exc import SQLAlchemyError

# pylint: disable=no-member

################################################################################
# Class describing Face in the database and DB via sqlalchemy
# - face contains the binary version of numpy array so we dont need to recalc it
# - locn is the pixel coords of the face (top, right, bottom, left)
# - refimg_lnk and facefile_lnk are viewOnly / just for convenience in viewer
# - refimg is a real link to the refimg used for this face (its is only used in
#   viewer, and is either set when there is a matched face, or None if no match
################################################################################
class Face(db.Model):
    __tablename__ = "face"
    id = db.Column(db.Integer, db.Sequence('face_id_seq'), primary_key=True )
    face = db.Column( db.LargeBinary )
    locn = db.Column( db.String )
    refimg_lnk = db.relationship("FaceRefimgLink", uselist=False, viewonly=True)
    facefile_lnk = db.relationship("FaceFileLink", uselist=False, viewonly=True)
    refimg =db.relationship("Refimg", secondary="face_refimg_link", uselist=False)

    def __repr__(self):
        return f"<id: {self.id}, face={self.face}, locn={self.locn}"

################################################################################
# Class describing FaceFileLink in the database and DB via sqlalchemy
# each face comes from a file and used a model to find the face
# this is not perfect, each face in the same file is always foudn with the same
# model - so really should have ModelFileLink or something, in the long run
#         this might even be better as ScanDetailsFileLink  and ScanDetails
################################################################################
class FaceFileLink(db.Model):
    __tablename__ = "face_file_link"
    face_id = db.Column(db.Integer, db.ForeignKey("face.id"), primary_key=True )
    file_eid = db.Column(db.Integer, db.ForeignKey("file.eid"), primary_key=True )
    model_used = db.Column(db.Integer, db.ForeignKey("ai_model.id"), primary_key=True )

    def __repr__(self):
        return f"<face_id: {self.face_id}, file_eid={self.file_eid}, model_used: {self.model_used}"

################################################################################
# Class describing FaceRefimgLink in the database and DB via sqlalchemy
# connects / implies a face has matched a refimg and we keep the distance too
# distance is mainly for debugging for now and shown in viewer
################################################################################
class FaceRefimgLink(db.Model):
    __tablename__ = "face_refimg_link"
    face_id = db.Column(db.Integer, db.ForeignKey("face.id"), primary_key=True )
    refimg_id = db.Column(db.Integer, db.ForeignKey("refimg.id"), primary_key=True )
    face_distance = db.Column(db.Integer)

    def __repr__(self):
        return f"<face_id: {self.face_id}, refimg_id={self.refimg_id}, face_distance: {self.face_distance}"