#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""

   Copyright 2014-2023 OpenEEmeter contributors

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

"""
import json
from pkg_resources import resource_stream

from dateutil.parser import parse as parse_date
import pytz

from ..io import meter_data_from_csv, temperature_data_from_csv

__all__ = ("samples", "load_sample")


def _load_sample_metadata():
    with resource_stream("eemeter.samples", "metadata.json") as f:
        metadata = json.loads(f.read().decode("utf-8"))
    return metadata


def samples():
    """Load a list of sample data identifiers.

    Returns
    -------
    samples : :any:`list` of :any:`str`
        List of sample identifiers for use with :any:`eemeter.load_sample`.
    """
    sample_metadata = _load_sample_metadata()
    return list(sorted(sample_metadata.keys()))


def load_sample(sample, tempF=True):
    """Load meter data, temperature data, and metadata for associated with a
    particular sample identifier. Note: samples are simulated, not real, data.

    Parameters
    ----------
    sample : :any:`str`
        Identifier of sample. Complete list can be obtained with
        :any:`eemeter.samples`.
    tempF : :any 'bool'
        Flag regarding whether the sample temperature dataset is associated with Fahrenheit or Celsius.

    Returns
    -------
    meter_data, temperature_data, metadata : :any:`tuple` of :any:`pandas.DataFrame`, :any:`pandas.Series`, and :any:`dict`
        Meter data, temperature data, and metadata for this sample identifier.
    """
    if tempF == True:
        temp_units = "tempF"
    else:
        temp_units = "tempC"

    sample_metadata = _load_sample_metadata()
    metadata = sample_metadata.get(sample)
    if metadata is None:
        raise ValueError(
            "Sample not found: {}. Try one of these?\n{}".format(
                sample,
                "\n".join(
                    [" - {}".format(key) for key in sorted(sample_metadata.keys())]
                ),
            )
        )

    freq = metadata.get("freq")
    if freq not in ("hourly", "daily"):
        freq = None

    meter_data_filename = metadata["meter_data_filename"]
    with resource_stream("eemeter.samples", meter_data_filename) as f:
        meter_data = meter_data_from_csv(f, gzipped=True, freq=freq)

    temperature_filename = metadata["temperature_filename"]
    with resource_stream("eemeter.samples", temperature_filename) as f:
        temperature_data = temperature_data_from_csv(
            f, gzipped=True, freq="hourly", temp_col=temp_units
        )

    metadata["blackout_start_date"] = pytz.UTC.localize(
        parse_date(metadata["blackout_start_date"])
    )
    metadata["blackout_end_date"] = pytz.UTC.localize(
        parse_date(metadata["blackout_end_date"])
    )

    return meter_data, temperature_data, metadata
