from __future__ import annotations

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

from dcs.weather import Weather as PydcsWeather, Wind

from game.settings import Settings
from 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()