from datetime import datetime
from statistics import mean
from typing import List, Union

import pytest
import pytz
from gpxpy.gpxfield import SimpleTZ

from fittrackee.workouts.utils.workouts import (
    get_average_speed,
    get_workout_datetime,
)

utc_datetime = datetime(
    year=2022, month=6, day=11, hour=10, minute=23, second=00, tzinfo=pytz.utc
)
input_workout_dates = [
    utc_datetime,
    utc_datetime.replace(tzinfo=None),
    utc_datetime.replace(tzinfo=SimpleTZ('Z')),
    utc_datetime.astimezone(pytz.timezone('Europe/Paris')),
    utc_datetime.astimezone(pytz.timezone('America/Toronto')),
    '2022-06-11 12:23:00',
]


class TestWorkoutAverageSpeed:
    @pytest.mark.parametrize(
        'ave_speeds_list',
        [
            ([0]),
            ([10]),
            ([0, 0]),
            ([10, 20]),
            ([10, 0, 20, 10]),
            ([1.5, 2, 3.7, 4.2]),
        ],
    )
    def test_it_calculates_average_speed(self, ave_speeds_list: List) -> None:
        nb_workouts = len(ave_speeds_list)
        total_average_speed = (
            sum(ave_speeds_list[:-1]) / (len(ave_speeds_list) - 1)
            if len(ave_speeds_list) > 1
            else ave_speeds_list[0]
        )
        workout_average_speed = ave_speeds_list[-1]

        assert get_average_speed(
            nb_workouts, total_average_speed, workout_average_speed
        ) == mean(ave_speeds_list)


class TestWorkoutGetWorkoutDatetime:
    @pytest.mark.parametrize('input_workout_date', input_workout_dates)
    def test_it_returns_naive_datetime(
        self, input_workout_date: Union[datetime, str]
    ) -> None:
        naive_workout_date, _ = get_workout_datetime(
            workout_date=input_workout_date, user_timezone='Europe/Paris'
        )

        assert naive_workout_date == datetime(
            year=2022, month=6, day=11, hour=10, minute=23, second=00
        )

    def test_it_return_naive_datetime_when_no_user_timezone(self) -> None:
        naive_workout_date, _ = get_workout_datetime(
            workout_date='2022-06-11 12:23:00', user_timezone=None
        )

        assert naive_workout_date == datetime(
            year=2022, month=6, day=11, hour=12, minute=23, second=00
        )

    @pytest.mark.parametrize('input_workout_date', input_workout_dates)
    def test_it_returns_datetime_with_user_timezone(
        self, input_workout_date: Union[datetime, str]
    ) -> None:
        timezone = 'Europe/Paris'

        _, workout_date_with_tz = get_workout_datetime(
            input_workout_date, user_timezone=timezone, with_timezone=True
        )

        assert workout_date_with_tz == datetime(
            year=2022,
            month=6,
            day=11,
            hour=10,
            minute=23,
            second=00,
            tzinfo=pytz.utc,
        ).astimezone(pytz.timezone(timezone))

    def test_it_does_not_return_datetime_with_user_timezone_when_no_user_tz(
        self,
    ) -> None:
        _, workout_date_with_tz = get_workout_datetime(
            workout_date='2022-06-11 12:23:00',
            user_timezone=None,
            with_timezone=True,
        )

        assert workout_date_with_tz is None

    def test_it_does_not_return_datetime_with_user_timezone_when_with_timezone_to_false(  # noqa
        self,
    ) -> None:
        _, workout_date_with_tz = get_workout_datetime(
            workout_date='2022-06-11 12:23:00',
            user_timezone='Europe/Paris',
            with_timezone=False,
        )

        assert workout_date_with_tz is None