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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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"""Loads datasets, dashboards and slices in a new superset instance"""
import textwrap

import pandas as pd
from sqlalchemy import Float, String
from sqlalchemy.sql import column

from superset import db
from superset.connectors.sqla.models import SqlMetric
from superset.models.slice import Slice
from superset.utils import core as utils

from .helpers import (
    get_example_data,
    get_table_connector_registry,
    merge_slice,
    misc_dash_slices,
)


def load_energy(
    only_metadata: bool = False, force: bool = False, sample: bool = False
) -> None:
    """Loads an energy related dataset to use with sankey and graphs"""
    tbl_name = "energy_usage"
    database = utils.get_example_database()
    table_exists = database.has_table_by_name(tbl_name)

    if not only_metadata and (not table_exists or force):
        data = get_example_data("energy.json.gz")
        pdf = pd.read_json(data)
        pdf = pdf.head(100) if sample else pdf
        pdf.to_sql(
            tbl_name,
            database.get_sqla_engine(),
            if_exists="replace",
            chunksize=500,
            dtype={"source": String(255), "target": String(255), "value": Float()},
            index=False,
            method="multi",
        )

    print("Creating table [wb_health_population] reference")
    table = get_table_connector_registry()
    tbl = db.session.query(table).filter_by(table_name=tbl_name).first()
    if not tbl:
        tbl = table(table_name=tbl_name)
    tbl.description = "Energy consumption"
    tbl.database = database
    tbl.filter_select_enabled = True

    if not any(col.metric_name == "sum__value" for col in tbl.metrics):
        col = str(column("value").compile(db.engine))
        tbl.metrics.append(
            SqlMetric(metric_name="sum__value", expression=f"SUM({col})")
        )

    db.session.merge(tbl)
    db.session.commit()
    tbl.fetch_metadata()

    slc = Slice(
        slice_name="Energy Sankey",
        viz_type="sankey",
        datasource_type="table",
        datasource_id=tbl.id,
        params=textwrap.dedent(
            """\
        {
            "collapsed_fieldsets": "",
            "groupby": [
                "source",
                "target"
            ],
            "metric": "sum__value",
            "row_limit": "5000",
            "slice_name": "Energy Sankey",
            "viz_type": "sankey"
        }
        """
        ),
    )
    misc_dash_slices.add(slc.slice_name)
    merge_slice(slc)

    slc = Slice(
        slice_name="Energy Force Layout",
        viz_type="graph_chart",
        datasource_type="table",
        datasource_id=tbl.id,
        params=textwrap.dedent(
            """\
        {
            "source": "source",
            "target": "target",
            "edgeLength": 400,
            "repulsion": 1000,
            "layout": "force",
            "metric": "sum__value",
            "row_limit": "5000",
            "slice_name": "Force",
            "viz_type": "graph_chart"
        }
        """
        ),
    )
    misc_dash_slices.add(slc.slice_name)
    merge_slice(slc)

    slc = Slice(
        slice_name="Heatmap",
        viz_type="heatmap",
        datasource_type="table",
        datasource_id=tbl.id,
        params=textwrap.dedent(
            """\
        {
            "all_columns_x": "source",
            "all_columns_y": "target",
            "canvas_image_rendering": "pixelated",
            "collapsed_fieldsets": "",
            "linear_color_scheme": "blue_white_yellow",
            "metric": "sum__value",
            "normalize_across": "heatmap",
            "slice_name": "Heatmap",
            "viz_type": "heatmap",
            "xscale_interval": "1",
            "yscale_interval": "1"
        }
        """
        ),
    )
    misc_dash_slices.add(slc.slice_name)
    merge_slice(slc)