from __future__ import annotations

import datetime
import logging
import random
from dataclasses import dataclass
from enum import Enum
from typing import Optional, TYPE_CHECKING

from dcs.weather import Weather as PydcsWeather, Wind

from game.settings import Settings

if TYPE_CHECKING:
    from game.theater import ConflictTheater


class TimeOfDay(Enum):
    Dawn = "dawn"
    Day = "day"
    Dusk = "dusk"
    Night = "night"


@dataclass(frozen=True)
class WindConditions:
    at_0m: Wind
    at_2000m: Wind
    at_8000m: Wind


@dataclass(frozen=True)
class Clouds:
    base: int
    density: int
    thickness: int
    precipitation: PydcsWeather.Preceptions


@dataclass(frozen=True)
class Fog:
    visibility: int
    thickness: int


class Weather:
    def __init__(self) -> None:
        self.clouds = self.generate_clouds()
        self.fog = self.generate_fog()
        self.wind = self.generate_wind()

    def generate_clouds(self) -> Optional[Clouds]:
        raise NotImplementedError

    def generate_fog(self) -> Optional[Fog]:
        if random.randrange(5) != 0:
            return None
        return Fog(
            visibility=random.randint(2500, 5000),
            thickness=random.randint(100, 500)
        )

    def generate_wind(self) -> WindConditions:
        raise NotImplementedError

    @staticmethod
    def random_wind(minimum: int, maximum) -> WindConditions:
        wind_direction = random.randint(0, 360)
        at_0m_factor = 1
        at_2000m_factor = 2
        at_8000m_factor = 3
        base_wind = random.randint(minimum, maximum)

        return WindConditions(
            # Always some wind to make the smoke move a bit.
            at_0m=Wind(wind_direction, max(1, base_wind * at_0m_factor)),
            at_2000m=Wind(wind_direction, base_wind * at_2000m_factor),
            at_8000m=Wind(wind_direction, base_wind * at_8000m_factor)
        )

    @staticmethod
    def random_cloud_base() -> int:
        return random.randint(2000, 3000)

    @staticmethod
    def random_cloud_thickness() -> int:
        return random.randint(100, 400)


class ClearSkies(Weather):
    def generate_clouds(self) -> Optional[Clouds]:
        return None

    def generate_fog(self) -> Optional[Fog]:
        return None

    def generate_wind(self) -> WindConditions:
        return self.random_wind(0, 0)


class Cloudy(Weather):
    def generate_clouds(self) -> Optional[Clouds]:
        return Clouds(
            base=self.random_cloud_base(),
            density=random.randint(1, 8),
            thickness=self.random_cloud_thickness(),
            precipitation=PydcsWeather.Preceptions.None_
        )

    def generate_wind(self) -> WindConditions:
        return self.random_wind(0, 4)


class Raining(Weather):
    def generate_clouds(self) -> Optional[Clouds]:
        return Clouds(
            base=self.random_cloud_base(),
            density=random.randint(5, 8),
            thickness=self.random_cloud_thickness(),
            precipitation=PydcsWeather.Preceptions.Rain
        )

    def generate_wind(self) -> WindConditions:
        return self.random_wind(0, 6)


class Thunderstorm(Weather):
    def generate_clouds(self) -> Optional[Clouds]:
        return Clouds(
            base=self.random_cloud_base(),
            density=random.randint(9, 10),
            thickness=self.random_cloud_thickness(),
            precipitation=PydcsWeather.Preceptions.Thunderstorm
        )

    def generate_wind(self) -> WindConditions:
        return self.random_wind(0, 8)


@dataclass
class Conditions:
    time_of_day: TimeOfDay
    start_time: datetime.datetime
    weather: Weather

    @classmethod
    def generate(cls, theater: ConflictTheater, day: datetime.date,
                 time_of_day: TimeOfDay, settings: Settings) -> Conditions:
        return cls(
            time_of_day=time_of_day,
            start_time=cls.generate_start_time(
                theater, day, time_of_day, settings.night_disabled
            ),
            weather=cls.generate_weather()
        )

    @classmethod
    def generate_start_time(cls, theater: ConflictTheater, day: datetime.date,
                            time_of_day: TimeOfDay,
                            night_disabled: bool) -> datetime.datetime:
        if night_disabled:
            logging.info("Skip Night mission due to user settings")
            time_range = {
                TimeOfDay.Dawn: (8, 9),
                TimeOfDay.Day: (10, 12),
                TimeOfDay.Dusk: (12, 14),
                TimeOfDay.Night: (14, 17),
            }[time_of_day]
        else:
            time_range = theater.daytime_map[time_of_day.value]

        time = datetime.time(hour=random.randint(*time_range))
        return datetime.datetime.combine(day, time)

    @classmethod
    def generate_weather(cls) -> Weather:
        chances = {
            Thunderstorm: 1,
            Raining: 20,
            Cloudy: 60,
            ClearSkies: 20,
        }
        weather_type = random.choices(list(chances.keys()),
                                      weights=list(chances.values()))[0]
        return weather_type()