import json
from datetime import datetime

from sqlalchemy.ext.hybrid import hybrid_property

from backend import db

# This is the association table for the many-to-many relationship between
# virtual commands and recorder commands.
virtual_command_recorder_command_table = db.Table('virtual_command_recorder_command',
                           db.Column('virtual_command_id', db.Integer,
                                  db.ForeignKey('virtual_command.id',
                                             onupdate="CASCADE",
                                             ondelete="CASCADE"),
                                  primary_key=True),
                           db.Column('recorder_command_id', db.Integer,
                                  db.ForeignKey('recorder_command.id',
                                             onupdate="CASCADE",
                                             ondelete="CASCADE"),
                                  primary_key=True))


# This is the association table for the many-to-many relationship between
# virtual commands and recorder commands.
virtual_command_recorder_table = db.Table('virtual_command_recorder',
                           db.Column('virtual_command_id', db.Integer,
                                  db.ForeignKey('virtual_command.id',
                                             onupdate="CASCADE",
                                             ondelete="CASCADE"),
                                  primary_key=True),
                           db.Column('recorder_id', db.Integer,
                                  db.ForeignKey('recorder.id',
                                             onupdate="CASCADE",
                                             ondelete="CASCADE"),
                                  primary_key=True))


class VirtualCommand(db.Model):
    id = db.Column(db.Integer, autoincrement=True, primary_key=True)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.utcnow())
    name = db.Column(db.Unicode(63), unique=True, nullable=False)
    description = db.Column(db.Unicode(255), unique=False, nullable=True, default="")

    recorders = db.relationship('Recorder', secondary=virtual_command_recorder_table,
                                back_populates='virtual_commands')

    recorder_commands = db.relationship('RecorderCommand', secondary=virtual_command_recorder_command_table,
                                        back_populates='virtual_commands')

    parent_virtual_command = db.relationship('VirtualCommand', back_populates='child_virtual_commands',
                                             nullable=True, default=None)
    child_virtual_commands = db.relationship('VirtualCommand', back_populates='parent_virtual_command')

    command_order_string = db.Column(db.String)

    def __init__(self, **kwargs):
        super(VirtualCommand, self).__init__(**kwargs)

    @staticmethod
    def get_by_name(name):
        """
        Find group by name
        :param name:
        :return:
        """
        return VirtualCommand.query.filter(VirtualCommand.name == name).first()

    @staticmethod
    def get_all():
        """
        Return all groups
        :return:
        """
        return VirtualCommand.query.all()

    @hybrid_property
    def command_order(self):
        if self.command_order_string is None:
            return []
        return json.loads(self.command_order_string)

    @command_order.setter
    def command_order(self, ordered_list_of_commands: list):
        self.command_order_string = json.dumps(ordered_list_of_commands)

    def __str__(self):
        return self.name

    def to_dict(self):
        return dict(id=self.id, name=self.name, description=self.description)

    def toJSON(self):
        return json.dumps(self.to_dict(), default=lambda o: o.__dict__,
                          sort_keys=True, indent=4)