# coding utf-8

# classes/sweet.py

# class:: Sweet

from flask import current_app

from datetime import datetime

from swtstore.classes.database import db

# custom SQLAlchemy type JSONType

from swtstore.classes.models.types import JSONType

from swtstore.classes.utils import urlnorm  # normalize URLs

from swtstore.classes.models import Context, User

from swtstore.classes.exceptions import InvalidPayload, ContextDoNotExist

class Sweet(db.Model):

    """ customary docstring """

    __tablename__ = 'sweets'

    id = db.Column(db.Integer, primary_key=True)

    user_id = db.Column(db.Integer, db.ForeignKey('users.id'))

    who = db.relationship('User')

    context_id = db.Column(db.Integer, db.ForeignKey('contexts.id'))

    what = db.relationship('Context')

    where = db.Column(db.UnicodeText, nullable=False)

    how = db.Column(JSONType)

    created = db.Column(db.DateTime, default=datetime.utcnow)

    def __init__(self, who, what, where, how):

        current_app.logger.info('initing sweet..')

        self.who = who

        self.what = what

        self.where = urlnorm(where)

        self.how = how

    def __repr__(self):

        return '[Sweet Object: <%s : @%s: #%s : %s>]' % (self.id, self.who,

                                                        self.what, self.where)

    def __str__(self):

        return '[Sweet Object: <%s : @%s: #%s : %s>]' % (self.id, self.who,

                                                        self.what, self.where)

    # Update the sweet - only 'how' and 'where' fields can be updated

    def update(self, **kwargs):

        if kwargs.get('how'):

            self.how = kwargs.get('how')

            self.persist()

        if kwargs.get('where'):

            self.where = kwargs.get('where')

            self.persist()

        return None

    # create multiple sweets from a list of JSON

    @staticmethod

    def createSweets(who, payload):

        # the payload has to be a list; a list of swts

        for each in payload:

            if 'what' not in each and 'where' not in each and 'how' not in\

                    each:

                raise InvalidPayload('Invalid payload %s \n while creating\

                                     mutiple sweets' % (each))

                return None

        # all ok. create swts from the list now

        swts = []

        for each in payload:

            what = Context.getByName(each['what'])

            if what is None:

                raise ContextDoNotExist('Context %s do not exist!' %

                                        (each['what']))

            current_app.logger.debug('SWEET PAYLOAD\n---\n%s\n%s\n%s\n%s\n----',

                                    who, what, each['where'], each['how'])

            new_sweet = Sweet(who, what, each['where'], each['how'])

            new_sweet.persist()

            current_app.logger.debug('New Sweet %s', new_sweet)

            swts.append(new_sweet)

        return swts

    # get Sweets for frontend

    @staticmethod

    def getFrontendSwts():

        return Sweet.query.order_by(Sweet.created.desc()).all()

    # get all sweets authored by a particular user

    @staticmethod

    def getByCreator(user):

        return Sweet.query.filter_by(who=user).\

                order_by(Sweet.created.desc()).all()

    # allow to query all sweets based on "who", "what" and "where" params

    @staticmethod

    def queryByAll(params):

        if params.get('who'):

            params['who'] = User.getByName(params['who'])

        if params.get('what'):

            params['what'] = Context.getByName(params['what'])

        return Sweet.query.filter_by(**params).all()

    # return a dictionary of data members

    def to_dict(self):

        return {

            'id': self.id,

            'who': self.who.username,

            'user_id': self.user_id,

            'what': self.what.name,

            'context_id': self.context_id,

            'where': self.where,

            'how': self.how,

            #'created': self.created.isoformat()

            'created': self.created.strftime('%a, %d %b %Y, %I:%M %p UTC'),

        }

    # create and persist the sweet to the database

    def persist(self):

        current_app.logger.debug('Commiting sweet %s to db', self)

        db.session.add(self)

        db.session.commit()