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import logging

import pandas as pd
from flask import current_app
from sqlalchemy import DateTime, 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_slice_json,
    get_table_connector_registry,
    merge_slice,
    read_example_data,
)

logger = logging.getLogger(__name__)


def load_random_time_series_data(
    only_metadata: bool = False, force: bool = False
) -> None:
    """Loading random time series data from a zip file in the repo"""
    tbl_name = "random_time_series"
    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):
            pdf = read_example_data(
                "examples://random_time_series.json.gz", compression="gzip"
            )
            if database.backend == "presto":
                pdf.ds = pd.to_datetime(pdf.ds, unit="s")
                pdf.ds = pdf.ds.dt.strftime("%Y-%m-%d %H:%M%:%S")
            else:
                pdf.ds = pd.to_datetime(pdf.ds, unit="s")

            pdf.to_sql(
                tbl_name,
                engine,
                schema=schema,
                if_exists="replace",
                chunksize=500,
                dtype={"ds": DateTime if database.backend != "presto" else String(255)},
                index=False,
            )
        logger.debug("Done loading table!")
        logger.debug("-" * 80)

    logger.debug("Creating table [%s] reference", tbl_name)
    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 = "ds"
    obj.database = database
    obj.filter_select_enabled = True
    obj.fetch_metadata()
    tbl = obj

    slice_data = {
        "granularity_sqla": "ds",
        "row_limit": current_app.config["ROW_LIMIT"],
        "since": "2019-01-01",
        "until": "2019-02-01",
        "metrics": ["count"],
        "viz_type": "cal_heatmap",
        "domain_granularity": "month",
        "subdomain_granularity": "day",
    }

    logger.debug("Creating a slice")
    slc = Slice(
        slice_name="Calendar Heatmap",
        viz_type="cal_heatmap",
        datasource_type=DatasourceType.TABLE,
        datasource_id=tbl.id,
        params=get_slice_json(slice_data),
    )
    merge_slice(slc)