"""Abacus Event Model.

Python abstraction of an abacus_event, the
normalized event that is sent between abacus nodes.
"""

import json


class AbacusEvent:
    """Abacus Event class."""

    def __init__(self, **kwargs):
        """Set object properties from kwargs."""
        self.abacus_event_id = kwargs.get('abacus_event_id', None)
        self.event_date = kwargs.get('event_date', None)
        self.event_name = kwargs.get('event_name', None)
        self.previous_abacus_event_id = kwargs.get('previous_abacus_event_id', None)
        self.rolled_back_at = kwargs.get('rolled_back_at', None)
        self.statement_period_id = kwargs.get('statement_period_id', None)
        self.target_id = kwargs.get('target_id', None)
        self.target_type = kwargs.get('target_type', None)
        self.user_id = kwargs.get('user_id', None)
        self.user_type = kwargs.get('user_type', None)

    @classmethod
    def from_params(cls, params):
        """Get the AbacusEvent from the params passed by ows-abacus-event."""
        abacus_event_properties = {}
        conf = params.get('conf')
        if conf:
            abacus_event_properties = json.loads(conf)
        return AbacusEvent(**abacus_event_properties)

    @classmethod
    def from_json(cls, event_json):
        """Get the AbacusEvent from a JSON string."""
        return AbacusEvent(**json.loads(event_json))

    def to_json(self):
        """Get the AbacusEvent as a JSON string."""
        return json.dumps(self.to_dict())

    def to_dict(self):
        """Get the AbacusEvent as a python dict."""
        return {
            'abacus_event_id': self.abacus_event_id,
            'event_date': self.event_date,
            'event_name': self.event_name,
            'previous_abacus_event_id': self.previous_abacus_event_id,
            'rolled_back_at': self.rolled_back_at,
            'statement_period_id': self.statement_period_id,
            'target_id': self.target_id,
            'target_type': self.target_type,
            'user_id': self.user_id,
            'user_type': self.user_type
        }