""" file containing all classes/functions to handle Path from the database """

from flask import url_for
from shared import PA, ICON
from main import db

################################################################################
class PathType(db.Model):
    """Class describing the type of Paths in the database

    Attributes:
        id (int): database id of row in PathType table / primary key
        name (str): name of path type (e.g. import, storage, bin)
    """

    __tablename__ = "path_type"
    id:int = db.Column(db.Integer, db.Sequence("path_type_id_seq"), primary_key=True )
    name:str = db.Column(db.String, unique=True, nullable=False )

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

################################################################################
class Path(db.Model):
    __allow_unmapped__ = True

    """Class describing a Path in the database

    Attributes:
        id (int): database id of row in Path table / primary key
        type_id (int): id of row in PathType table / foreign key
        type (PathType): sqlalchemy relationship of PathType using type_id
        path_prefix (str): The actual dir on the filesystem that defines this Path
        num_files (int): number of files in this Path
    """
    __tablename__ = "path"
    id:int = db.Column(db.Integer, db.Sequence("path_id_seq"), primary_key=True )
    type_id:int = db.Column(db.Integer, db.ForeignKey("path_type.id"))
    type:PathType = db.relationship("PathType")
    path_prefix:str = db.Column(db.String, unique=True, nullable=False )
    num_files:int = db.Column(db.Integer)

    def __repr__(self):
        return f"<id: {self.id}, path_prefix: {self.path_prefix}, num_files={self.num_files}, type={self.type}>"


################################################################################
# Class describing PathDetail (quick connvenence class for MovePathDetails())
################################################################################
class PathDetail(PA):
    """Class describing details of a Path [internal class used in MovePathDetais()]"""

    def __init__(self,ptype,path):
        """Initialisation function for PathDetail class

        Args:
            id (int): database id of row in PathDetail table / primary key
            ptype (int): database id of row in PathType table / foreign key
        """

        self.type:int=ptype
        self.path:str=path
        # construct icon_url based on type of storage path (icons.svg contains icons for each)
        self.icon_url:str=url_for("internal", filename="icons.svg") + "#" + ICON[self.type]

################################################################################
# helper function to find path details for move destinations - used in html
# for move DBox to show potential storage paths to move files into
################################################################################
def MovePathDetails():
    """helper function to find path details for move destinations

       used in html/javascript for move Dialog Box to show potential storage paths to move files into

       Args:
           None

       Returns:
           ret (List[PathDetail]): a list of Path Details for where files can be moved

    """
    ret=[]
    sps=Path.query.join(PathType).filter(PathType.name=="Storage").all()
    for p in sps:
        obj = PathDetail( ptype="Storage", path=p.path_prefix.replace("static/Storage/","") )
        ret.append( obj )
    ips=Path.query.join(PathType).filter(PathType.name=="Import").all()
    for p in ips:
        obj = PathDetail( ptype="Import", path=p.path_prefix.replace("static/Import/","") )
        ret.append( obj )
    return ret