airbnb/caravel

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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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import datetime
import random

import geohash
import pandas as pd
from sqlalchemy import DateTime, Float, inspect, String

import superset.utils.database as database_utils
from superset import db
from superset.models.slice import Slice
from superset.sql_parse import Table
from superset.utils.core import DatasourceType

from .helpers import (
    get_example_url,
    get_slice_json,
    get_table_connector_registry,
    merge_slice,
    misc_dash_slices,
)


def load_long_lat_data(only_metadata: bool = False, force: bool = False) -> None:
    """Loading lat/long data from a csv file in the repo"""
    tbl_name = "long_lat"
    database = database_utils.get_example_database()
    with database.get_sqla_engine() as engine:
        schema = inspect(engine).default_schema_name
        table_exists = database.has_table(Table(tbl_name, schema))

        if not only_metadata and (not table_exists or force):
            url = get_example_url("san_francisco.csv.gz")
            pdf = pd.read_csv(url, encoding="utf-8", compression="gzip")
            start = datetime.datetime.now().replace(
                hour=0, minute=0, second=0, microsecond=0
            )
            pdf["datetime"] = [
                start + datetime.timedelta(hours=i * 24 / (len(pdf) - 1))
                for i in range(len(pdf))
            ]
            pdf["occupancy"] = [random.randint(1, 6) for _ in range(len(pdf))]
            pdf["radius_miles"] = [random.uniform(1, 3) for _ in range(len(pdf))]
            pdf["geohash"] = pdf[["LAT", "LON"]].apply(
                lambda x: geohash.encode(*x), axis=1
            )
            pdf["delimited"] = pdf["LAT"].map(str).str.cat(pdf["LON"].map(str), sep=",")
            pdf.to_sql(
                tbl_name,
                engine,
                schema=schema,
                if_exists="replace",
                chunksize=500,
                dtype={
                    "longitude": Float(),
                    "latitude": Float(),
                    "number": Float(),
                    "street": String(100),
                    "unit": String(10),
                    "city": String(50),
                    "district": String(50),
                    "region": String(50),
                    "postcode": Float(),
                    "id": String(100),
                    "datetime": DateTime(),
                    "occupancy": Float(),
                    "radius_miles": Float(),
                    "geohash": String(12),
                    "delimited": String(60),
                },
                index=False,
            )
        print("Done loading table!")
        print("-" * 80)

    print("Creating table reference")
    table = get_table_connector_registry()
    obj = db.session.query(table).filter_by(table_name=tbl_name).first()
    if not obj:
        obj = table(table_name=tbl_name, schema=schema)
        db.session.add(obj)
    obj.main_dttm_col = "datetime"
    obj.database = database
    obj.filter_select_enabled = True
    obj.fetch_metadata()
    tbl = obj

    slice_data = {
        "granularity_sqla": "day",
        "since": "2014-01-01",
        "until": "now",
        "viz_type": "mapbox",
        "all_columns_x": "LON",
        "all_columns_y": "LAT",
        "mapbox_style": "mapbox://styles/mapbox/light-v9",
        "all_columns": ["occupancy"],
        "row_limit": 500000,
    }

    print("Creating a slice")
    slc = Slice(
        slice_name="Mapbox Long/Lat",
        viz_type="mapbox",
        datasource_type=DatasourceType.TABLE,
        datasource_id=tbl.id,
        params=get_slice_json(slice_data),
    )
    misc_dash_slices.add(slc.slice_name)
    merge_slice(slc)