from app.core import db
from sqlalchemy.dialects.postgresql import JSON


class Dashboard(db.Model):
    __tablename__ = 'dashboards'

    id = db.Column(db.Integer, primary_key=True)
    dashboard_data = db.Column(JSON, nullable=False)
    account_id = db.Column(db.Integer, db.ForeignKey('accounts.id'),
                           primary_key=True)
    active = db.Column(db.Boolean, nullable=False, default=False)
    name = db.Column(db.String, nullable=False, default="")
    created_at = db.Column(db.DateTime,
                           nullable=False,
                           default=db.func.current_timestamp())
    modified_at = db.Column(db.DateTime,
                            nullable=False,
                            default=db.func.current_timestamp(),
                            onupdate=db.func.current_timestamp())

    widgets = db.relationship("DashboardWidget",
                              cascade="save-update, merge, delete")

    def __init__(self, account_id, dashboard_data, name):
        self.account_id = account_id
        self.dashboard_data = dashboard_data
        self.name = name

    def save(self):
        """
        Stores this dashboard to database
        This may raise errors
        """
        db.session.add(self)
        db.session.commit()

    def delete(self):
        """
        Deletes this dashboard from database
        """
        db.session.delete(self)
        db.session.commit()

    @staticmethod
    def exists_with_any_of(**kwargs):
        """
        Checks if dashboard with any of the given arguments exists
        """
        for key, value in kwargs.items():
            args = {key: value}
            if Dashboard.query.filter_by(**args).first():
                return True
        return False

    @staticmethod
    def exists(**kwargs):
        """
        Checks if dashboard with all of the given arguments exists
        """
        if Dashboard.query.filter_by(**kwargs).first():
            return True
        return False

    @staticmethod
    def get_all():
        """
        Get all stored dashboards
        """
        return Dashboard.query.all()

    @staticmethod
    def get_many(**kwargs):
        """
        Get dashboards with given filters

        Available filters:
         * id
         * account_id
        """
        return Dashboard.query.filter_by(**kwargs).all()

    @staticmethod
    def get_many_filtered(account_id, active):
        """
        Get many dashboard with given filters

        Available filters:
         * active
        """
        query = Dashboard.query.filter(Dashboard.account_id == account_id)
        if active is not None:
            query = query.filter(Dashboard.active == active)
        return query.all()

    @staticmethod
    def deactivate_all_for_user(account_id):
        """
        Deactivates all dashboards for this user
        """
        db.session.query(Dashboard).filter(account_id == account_id) \
                                   .update({'active': False})
        db.session.commit()

    @staticmethod
    def get(**kwargs):
        """
        Get dashboard with given filters

        Available filters:
         * id
         * account_id
        """
        return Dashboard.query.filter_by(**kwargs).first_or_404()

    def __repr__(self):
        return '<Dashboard (dashboard_data=%s, account_id=%s)>' % (
                self.dashboard_data, self.account_id)


class DashboardWidget(db.Model):
    __tablename__ = 'dashboard_widgets'

    id = db.Column(db.Integer, primary_key=True)
    dashboard_id = db.Column(db.Integer, db.ForeignKey('dashboards.id'))
    device_id = db.Column(db.Integer, db.ForeignKey('devices.id'))
    height = db.Column(db.Integer, nullable=False)
    width = db.Column(db.Integer, nullable=False)
    x = db.Column(db.Integer, nullable=False)
    y = db.Column(db.Integer, nullable=False)
    chart_type = db.Column(db.String, nullable=False)
    filters = db.Column(JSON, nullable=False)
    created_at = db.Column(db.DateTime,
                           nullable=False,
                           default=db.func.current_timestamp())
    modified_at = db.Column(db.DateTime,
                            nullable=False,
                            default=db.func.current_timestamp(),
                            onupdate=db.func.current_timestamp())

    dashboard = db.relationship("Dashboard", foreign_keys=[dashboard_id])

    def __init__(self, dashboard_id, device_id, height, width, x, y,
                 chart_type, filters):
        self.dashboard_id = dashboard_id
        self.device_id = device_id
        self.height = height
        self.width = width
        self.x = x
        self.y = y
        self.chart_type = chart_type
        self.filters = filters

    def save(self):
        """
        Stores this widget to database
        This may raise errors
        """
        db.session.add(self)
        db.session.commit()

    def delete(self):
        """
        Deletes this widget from database
        """
        db.session.delete(self)
        db.session.commit()

    @staticmethod
    def exists_with_any_of(**kwargs):
        """
        Checks if widget with any of the given arguments exists
        """
        for key, value in kwargs.items():
            args = {key: value}
            if DashboardWidget.query.filter_by(**args).first():
                return True
        return False

    @staticmethod
    def exists(**kwargs):
        """
        Checks if widget with all of the given arguments exists
        """
        if DashboardWidget.query.filter_by(**kwargs).first():
            return True
        return False

    @staticmethod
    def get_all():
        """
        Get all stored widgets
        """
        return DashboardWidget.query.paginate(None, None, False).items

    @staticmethod
    def get_many(**kwargs):
        """
        Get widgets with given filters

        Available filters:
         * id
         * dashboard_id
         * device_id
         * dimensions and positions, but useless
         * chart_type
         * filters, but useless
        """
        return DashboardWidget.query.filter_by(**kwargs).paginate(
                None, None, False).items

    @staticmethod
    def get_many_for_dashboard(dashboard_id):
        """
        Get widgets for given dashboard
        """
        query = DashboardWidget.query.filter(
                DashboardWidget.dashboard_id == dashboard_id)
        return query.paginate(None, None, False).items

    @staticmethod
    def get(**kwargs):
        """
        Get widget with given filters

        Available filters:
         * id
         * dashboard_id
         * device_id
         * dimensions and positions, but useless
         * chart_type
         * filters, but useless
        """
        return DashboardWidget.query.filter_by(**kwargs).first_or_404()

    def __repr__(self):
        return '<DashboardWidget (id=%s, dashboard_id=%s)>' % (
                self.dashboard_data, self.account_id)