"""Main module of the Seasonal Clock"""

__version__ = '0.1.0'

from datetime import datetime, timedelta
from typing import List, Tuple, Union

from astral import Depression, LocationInfo, SunDirection, moon, sun
from pytz import UTC

from .config import load_config
from .hours import seasonal_hours


def get_moon_phase_text(moon_phase: float) -> str:
    """Get the name of the Moon phase"""

    name = 'Dark Moon'

    if moon_phase < 0.05:
        name = 'New Moon'
    elif moon_phase < 6.95:
        name = 'Waxing Crescent Moon'
    elif moon_phase < 7.05:
        name = 'Waxing Half Moon'
    elif moon_phase < 13.95:
        name = 'Waxing Gibbous Moon'
    elif moon_phase < 14.05:
        name = 'Full Moon'
    elif moon_phase < 20.95:
        name = 'Waning Gibbous Moon'
    elif moon_phase < 21.05:
        name = 'Waning Half Moon'
    elif moon_phase < 27.95:
        name = 'Waning Crescent Moon'

    return name


def collect_day_parts(
    observer: LocationInfo, date: datetime
) -> List[Tuple[str, datetime, str, str]]:
    """Collect timestamp for all parts of the day on date"""

    day_parts = []

    midnight = sun.midnight(observer, date=date)

    if midnight.date() < date.date():
        midnight = sun.midnight(observer, date=date + timedelta(days=1))
    elif midnight.date() > date.date():
        midnight = sun.midnight(observer, date=date - timedelta(days=1))

    day_parts.append(('midnight', midnight, 'Night', 'Midnight'))

    try:
        morning_blue_start = sun.blue_hour(
            observer, date=date, direction=SunDirection.RISING
        )[0]
    except ValueError:
        # At certain times and latitudes there might be no blue hour
        pass
    else:
        day_parts.append(
            (
                'morning_blue_start',
                morning_blue_start,
                'Morning blue hour',
                'Morning golden hour',
            )
        )

    try:
        golden_start, golden_end = sun.golden_hour(
            observer, date=date, direction=SunDirection.RISING
        )
    except ValueError:
        # At certain times and latitudes there might be no golden hour
        pass
    else:
        day_parts.append(
            ('morning_golden_start', golden_start, 'Morning golden hour', 'Full Daytime')
        )
        day_parts.append(('morning_golden_end', golden_end, 'Morning', 'Noon'))

    day_parts.append(('noon', sun.noon(observer, date=date), 'Afternoon', 'Noon'))

    try:
        evening_golden_start = sun.golden_hour(observer, date=date, direction=SunDirection.SETTING)[0]
    except ValueError:
        # At certain times and latitudes there might be no golden hour
        pass
    else:
        day_parts.append(
            (
                'evening_golden_start',
                evening_golden_start,
                'Evening golden hour',
                'Evening blue hour',
            )
        )

    try:
        blue_start, blue_end = sun.blue_hour(
            observer, date=date, direction=SunDirection.SETTING
        )
    except ValueError:
        # At certain times and latitudes there might be no blue hour
        pass
    else:
        day_parts.append(('evening_blue_start', blue_start, 'Evening blue hour', 'Night'))
        day_parts.append(('evening_blue_end', blue_end, 'Night', 'Midnight'))

    day_parts.sort(key=lambda elem: elem[1])

    return day_parts


def get_rahukaalam(observer: LocationInfo, date: datetime) -> Tuple[bool, datetime]:
    """Get the time of the next Rāhukāla or, if we are in the middle of one, the time of its end"""

    yesterday = date - timedelta(days=1)
    tomorrow = date + timedelta(days=1)
    times: List[Tuple[datetime, datetime]] = []

    for day in (yesterday, date, tomorrow):
        try:
            daytime_rahukaalam = sun.rahukaalam(observer, date=day, daytime=False)
        except ValueError:
            pass
        else:
            times.append(daytime_rahukaalam)

        try:
            night_rahukaalam = sun.rahukaalam(observer, date=day, daytime=True)
        except ValueError:
            pass
        else:
            times.append(night_rahukaalam)

    times.sort(key=lambda items: items[0])
    active: bool = False
    next_time: datetime = None

    for start, end in times:
        if date < start:
            active = False
            next_time = start

            break

        if start < date < end:
            active = True
            next_time = end

            break

    if next_time is None:
        return None, None

    return active, next_time


def main() -> None:
    """The Main Thing™"""

    config = load_config()

    location = LocationInfo(
        config['city'],
        config['country'],
        config['timezone'],
        config['latitude'],
        config['longitude'],
    )
    local_tz = location.tzinfo
    utc_now = datetime.utcnow().replace(tzinfo=UTC)
    local_now = utc_now.astimezone(local_tz)

    moon_phase = moon.phase(local_now)

    day_parts = collect_day_parts(location.observer, local_now)

    final_name = 'Night'
    upcoming_name = None
    final_idx = -1

    for idx, (_, time, name, next_name) in enumerate(day_parts):
        if utc_now > time:
            final_name = name
            upcoming_name = next_name
            final_idx = idx

    next_time = day_parts[final_idx + 1][1]

    if upcoming_name is None:
        upcoming_name = day_parts[0][2]

    print(
        f'Now: {local_now.strftime("%Y-%m-%d %H:%M:%S")} (UTC {utc_now.strftime("%Y-%m-%d %H:%M:%S")})'
    )
    print(f'{final_name}, {next_time-local_now} until {upcoming_name}')

    rahukaalam, next_rahukaalam = get_rahukaalam(location.observer, local_now)

    if next_rahukaalam is not None:
        if rahukaalam:
            print(f'Rāhukāla (until {next_rahukaalam.strftime("%H:%M:%S")})')
        else:
            print(f'Next Rāhukāla at {next_rahukaalam.strftime("%H:%M:%S")}')

    print(get_moon_phase_text(moon_phase))

    hour_num = utc_now.hour
    hour_short = seasonal_hours[utc_now.hour].short
    hour_long = seasonal_hours[utc_now.hour].long
    print(f'{hour_long} ({hour_short}, {hour_num})')