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# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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# pylint: disable=C,R,W
import json
import logging
import time
from datetime import datetime

from superset.connectors.sqla.models import SqlaTable, SqlMetric, TableColumn
from superset.models.dashboard import Dashboard
from superset.models.slice import Slice

logger = logging.getLogger(__name__)


def decode_dashboards(o):
    """
    Function to be passed into json.loads obj_hook parameter
    Recreates the dashboard object from a json representation.
    """
    import superset.models.core as models

    if "__Dashboard__" in o:
        return Dashboard(**o["__Dashboard__"])
    elif "__Slice__" in o:
        return Slice(**o["__Slice__"])
    elif "__TableColumn__" in o:
        return TableColumn(**o["__TableColumn__"])
    elif "__SqlaTable__" in o:
        return SqlaTable(**o["__SqlaTable__"])
    elif "__SqlMetric__" in o:
        return SqlMetric(**o["__SqlMetric__"])
    elif "__datetime__" in o:
        return datetime.strptime(o["__datetime__"], "%Y-%m-%dT%H:%M:%S")
    else:
        return o


def import_dashboards(session, data_stream, import_time=None):
    """Imports dashboards from a stream to databases"""
    current_tt = int(time.time())
    import_time = current_tt if import_time is None else import_time
    data = json.loads(data_stream.read(), object_hook=decode_dashboards)
    # TODO: import DRUID datasources
    for table in data["datasources"]:
        type(table).import_obj(table, import_time=import_time)
    session.commit()
    for dashboard in data["dashboards"]:
        Dashboard.import_obj(dashboard, import_time=import_time)
    session.commit()


def export_dashboards(session):
    """Returns all dashboards metadata as a json dump"""
    logger.info("Starting export")
    dashboards = session.query(Dashboard)
    dashboard_ids = []
    for dashboard in dashboards:
        dashboard_ids.append(dashboard.id)
    data = Dashboard.export_dashboards(dashboard_ids)
    return data