from flask.cli import AppGroup
import click

from datetime import datetime, timedelta
from sqlalchemy.sql import func

from ogn_python.collect.database import update_device_infos, update_country_code
from ogn_python.model import *
from ogn_python.utils import get_airports, get_days
from ogn_python import db

user_cli = AppGroup('database')
user_cli.help = "Database creation and handling."


ALEMBIC_CONFIG_FILE = "alembic.ini"


def get_database_days(start, end):
    """Returns the first and the last day in aircraft_beacons table."""

    if start is None and end is None:
        days_from_db = db.session.query(func.min(AircraftBeacon.timestamp).label('first_day'), func.max(AircraftBeacon.timestamp).label('last_day')).one()
        start = days_from_db[0].date()
        end = days_from_db[1].date()
    else:
        start = datetime.strptime(start, "%Y-%m-%d").date()
        end = datetime.strptime(end, "%Y-%m-%d").date()

    days = get_days(start, end)

    return days


@user_cli.command('info')
def info():
    import importlib
    import os
    config = importlib.import_module(os.environ['OGN_CONFIG_MODULE'])
    print(config)
    print(config.SQLALCHEMY_DATABASE_URI)


@user_cli.command('init')
def init():
    """Initialize the database."""

    from alembic.config import Config
    from alembic import command

    db.session.execute('CREATE EXTENSION IF NOT EXISTS postgis;')
    db.session.execute('CREATE EXTENSION IF NOT EXISTS btree_gist;')
    db.session.commit()
    db.create_all()

    #alembic_cfg = Config(ALEMBIC_CONFIG_FILE)
    #command.stamp(alembic_cfg, "head")
    print("Done.")


@user_cli.command('init_timescaledb')
def init_timescaledb():
    """Initialize TimescaleDB features."""

    db.session.execute('CREATE EXTENSION IF NOT EXISTS timescaledb;')
    db.session.execute("SELECT create_hypertable('aircraft_beacons', 'timestamp', chunk_target_size => '2GB', if_not_exists => TRUE);")
    db.session.execute("SELECT create_hypertable('receiver_beacons', 'timestamp', chunk_target_size => '2GB', if_not_exists => TRUE);")
    db.session.commit()


@user_cli.command('upgrade')
def upgrade():
    """Upgrade database to the latest version."""

    from alembic.config import Config
    from alembic import command

    alembic_cfg = Config(ALEMBIC_CONFIG_FILE)
    command.upgrade(alembic_cfg, 'head')


@user_cli.command('drop')
@click.option('--sure', default='n')
def drop(sure):
    """Drop all tables."""
    if sure == 'y':
        db.drop_all()
        print('Dropped all tables.')
    else:
        print("Add argument '--sure y' to drop all tables.")


@user_cli.command('import_ddb')
def import_ddb():
    """Import registered devices from the DDB."""

    print("Import registered devices fom the DDB...")
    counter = update_device_infos(db.session, DeviceInfoOrigin.ogn_ddb)
    print("Imported %i devices." % counter)


@user_cli.command('import_file')
@click.argument('path')
def import_file(path='tests/custom_ddb.txt'):
    """Import registered devices from a local file."""

    print("Import registered devices from '{}'...".format(path))
    counter = update_device_infos(db.session,
                                  DeviceInfoOrigin.user_defined,
                                  path=path)
    print("Imported %i devices." % counter)


@user_cli.command('import_flarmnet')
@click.argument('path')
def import_flarmnet(path=None):
    """Import registered devices from a local file."""

    print("Import registered devices from '{}'...".format("internet" if path is None else path))
    counter = update_device_infos(db.session,
                                  DeviceInfoOrigin.flarmnet,
                                  path=path)
    print("Imported %i devices." % counter)


@user_cli.command('import_airports')
@click.argument('path')
def import_airports(path='tests/SeeYou.cup'):
    """Import airports from a ".cup" file"""

    print("Import airports from '{}'...".format(path))
    airports = get_airports(path)
    db.session.bulk_save_objects(airports)
    db.session.commit()
    db.session.execute("UPDATE airports SET border = ST_Expand(location, 0.05)")
    db.session.commit()
    print("Imported {} airports.".format(len(airports)))


@user_cli.command('update_country_codes')
def update_country_codes():
    """Update country codes of all receivers."""

    update_country_code(session=db.session)