from __future__ import annotations

import datetime
import math
from pathlib import Path
from typing import Iterator, List, Optional, TYPE_CHECKING, Tuple
from uuid import UUID

from dcs.mapping import Point
from dcs.terrain import (
    falklands,
    nevada,
    normandy,
    thechannel,
)
from dcs.terrain.terrain import Terrain
from shapely import geometry, ops

from .daytimemap import DaytimeMap
from .frontline import FrontLine
from .iadsnetwork.iadsnetwork import IadsNetwork
from .landmap import Landmap, load_landmap, poly_contains
from .seasonalconditions import SeasonalConditions
from ..utils import Heading

if TYPE_CHECKING:
    from .controlpoint import ControlPoint, MissionTarget
    from .theatergroundobject import TheaterGroundObject


class ConflictTheater:
    terrain: Terrain

    landmap: Optional[Landmap]
    daytime_map: DaytimeMap
    iads_network: IadsNetwork

    def __init__(self) -> None:
        self.controlpoints: List[ControlPoint] = []

    def add_controlpoint(self, point: ControlPoint) -> None:
        self.controlpoints.append(point)

    @property
    def ground_objects(self) -> Iterator[TheaterGroundObject]:
        for cp in self.controlpoints:
            for go in cp.ground_objects:
                yield go

    def find_ground_objects_by_obj_name(
        self, obj_name: str
    ) -> list[TheaterGroundObject]:
        found = []
        for cp in self.controlpoints:
            for g in cp.ground_objects:
                if g.obj_name == obj_name:
                    found.append(g)
        return found

    def is_in_sea(self, point: Point) -> bool:
        if not self.landmap:
            return False

        if self.is_on_land(point):
            return False

        for exclusion_zone in self.landmap.exclusion_zones.geoms:
            if poly_contains(point.x, point.y, exclusion_zone):
                return False

        for sea in self.landmap.sea_zones.geoms:
            if poly_contains(point.x, point.y, sea):
                return True

        return False

    def is_on_land(self, point: Point) -> bool:
        if not self.landmap:
            return True

        is_point_included = False
        if poly_contains(point.x, point.y, self.landmap.inclusion_zones):
            is_point_included = True

        if not is_point_included:
            return False

        for exclusion_zone in self.landmap.exclusion_zones.geoms:
            if poly_contains(point.x, point.y, exclusion_zone):
                return False

        return True

    def nearest_land_pos(self, near: Point, extend_dist: int = 50) -> Point:
        """Returns the nearest point inside a land exclusion zone from point
        `extend_dist` determines how far inside the zone the point should be placed"""
        if self.is_on_land(near):
            return near
        point = geometry.Point(near.x, near.y)
        nearest_points = []
        if not self.landmap:
            raise RuntimeError("Landmap not initialized")
        for inclusion_zone in self.landmap.inclusion_zones.geoms:
            nearest_pair = ops.nearest_points(point, inclusion_zone)
            nearest_points.append(nearest_pair[1])
        min_distance = point.distance(nearest_points[0])  # type: geometry.Point
        nearest_point = nearest_points[0]  # type: geometry.Point
        for pt in nearest_points[1:]:
            distance = point.distance(pt)
            if distance < min_distance:
                min_distance = distance
                nearest_point = pt
        assert isinstance(nearest_point, geometry.Point)
        point = Point(point.x, point.y, self.terrain)
        nearest_point = Point(nearest_point.x, nearest_point.y, self.terrain)
        new_point = point.point_from_heading(
            point.heading_between_point(nearest_point),
            point.distance_to_point(nearest_point) + extend_dist,
        )
        return new_point

    def control_points_for(self, player: bool) -> Iterator[ControlPoint]:
        for point in self.controlpoints:
            if point.captured == player:
                yield point

    def player_points(self) -> List[ControlPoint]:
        return list(self.control_points_for(player=True))

    def conflicts(self) -> Iterator[FrontLine]:
        for cp in self.player_points():
            yield from cp.front_lines.values()

    def enemy_points(self) -> List[ControlPoint]:
        return list(self.control_points_for(player=False))

    def closest_control_point(
        self, point: Point, allow_naval: bool = False
    ) -> ControlPoint:
        closest = self.controlpoints[0]
        closest_distance = point.distance_to_point(closest.position)
        for control_point in self.controlpoints[1:]:
            if control_point.is_fleet and not allow_naval:
                continue
            distance = point.distance_to_point(control_point.position)
            if distance < closest_distance:
                closest = control_point
                closest_distance = distance
        return closest

    def closest_target(self, point: Point) -> MissionTarget:
        closest: MissionTarget = self.controlpoints[0]
        closest_distance = point.distance_to_point(closest.position)
        for control_point in self.controlpoints[1:]:
            distance = point.distance_to_point(control_point.position)
            if distance < closest_distance:
                closest = control_point
                closest_distance = distance
            for tgo in control_point.ground_objects:
                distance = point.distance_to_point(tgo.position)
                if distance < closest_distance:
                    closest = tgo
                    closest_distance = distance
        for conflict in self.conflicts():
            distance = conflict.position.distance_to_point(point)
            if distance < closest_distance:
                closest = conflict
                closest_distance = distance
        return closest

    def closest_opposing_control_points(self) -> Tuple[ControlPoint, ControlPoint]:
        """
        Returns a tuple of the two nearest opposing ControlPoints in theater.
        (player_cp, enemy_cp)
        """
        seen = set()
        min_distance = math.inf
        closest_blue = None
        closest_red = None
        for blue_cp in self.player_points():
            for red_cp in self.enemy_points():
                if (blue_cp, red_cp) in seen:
                    continue
                seen.add((blue_cp, red_cp))
                seen.add((red_cp, blue_cp))

                dist = red_cp.position.distance_to_point(blue_cp.position)
                if dist < min_distance:
                    closest_red = red_cp
                    closest_blue = blue_cp
                    min_distance = dist

        assert closest_blue is not None
        assert closest_red is not None
        return closest_blue, closest_red

    def find_control_point_by_id(self, cp_id: UUID) -> ControlPoint:
        for i in self.controlpoints:
            if i.id == cp_id:
                return i
        raise KeyError(f"Cannot find ControlPoint with ID {cp_id}")

    def find_control_point_by_airport_id(self, airport_id: int) -> ControlPoint:
        for cp in self.controlpoints:
            if cp.dcs_airport is not None and cp.dcs_airport.id == airport_id:
                return cp
        raise KeyError(f"Cannot find ControlPoint with airport ID {airport_id}")

    def control_point_named(self, name: str) -> ControlPoint:
        for cp in self.controlpoints:
            if cp.name == name:
                return cp
        raise KeyError(f"Cannot find ControlPoint named {name}")

    @property
    def timezone(self) -> datetime.timezone:
        raise NotImplementedError

    @property
    def seasonal_conditions(self) -> SeasonalConditions:
        raise NotImplementedError

    def heading_to_conflict_from(self, position: Point) -> Optional[Heading]:
        # Heading for a Group to the enemy.
        # Should be the point between the nearest and the most distant conflict
        conflicts: dict[MissionTarget, float] = {}

        for conflict in self.conflicts():
            conflicts[conflict] = conflict.position.distance_to_point(position)

        if len(conflicts) == 0:
            return None

        sorted_conflicts = [
            k for k, v in sorted(conflicts.items(), key=lambda item: item[1])
        ]
        last = len(sorted_conflicts) - 1

        conflict_center = sorted_conflicts[0].position.midpoint(
            sorted_conflicts[last].position
        )

        return Heading.from_degrees(position.heading_between_point(conflict_center))


class NevadaTheater(ConflictTheater):
    terrain = nevada.Nevada()
    landmap = load_landmap(Path("resources/nevlandmap.p"))
    daytime_map = DaytimeMap(
        dawn=(datetime.time(hour=4), datetime.time(hour=6)),
        day=(datetime.time(hour=6), datetime.time(hour=17)),
        dusk=(datetime.time(hour=17), datetime.time(hour=18)),
        night=(datetime.time(hour=0), datetime.time(hour=5)),
    )

    @property
    def timezone(self) -> datetime.timezone:
        return datetime.timezone(datetime.timedelta(hours=-8))

    @property
    def seasonal_conditions(self) -> SeasonalConditions:
        from .seasonalconditions.nevada import CONDITIONS

        return CONDITIONS


class NormandyTheater(ConflictTheater):
    terrain = normandy.Normandy()
    landmap = load_landmap(Path("resources/normandylandmap.p"))
    daytime_map = DaytimeMap(
        dawn=(datetime.time(hour=6), datetime.time(hour=8)),
        day=(datetime.time(hour=10), datetime.time(hour=17)),
        dusk=(datetime.time(hour=17), datetime.time(hour=18)),
        night=(datetime.time(hour=0), datetime.time(hour=5)),
    )

    @property
    def timezone(self) -> datetime.timezone:
        return datetime.timezone(datetime.timedelta(hours=0))

    @property
    def seasonal_conditions(self) -> SeasonalConditions:
        from .seasonalconditions.normandy import CONDITIONS

        return CONDITIONS


class TheChannelTheater(ConflictTheater):
    terrain = thechannel.TheChannel()
    landmap = load_landmap(Path("resources/channellandmap.p"))
    daytime_map = DaytimeMap(
        dawn=(datetime.time(hour=6), datetime.time(hour=8)),
        day=(datetime.time(hour=10), datetime.time(hour=17)),
        dusk=(datetime.time(hour=17), datetime.time(hour=18)),
        night=(datetime.time(hour=0), datetime.time(hour=5)),
    )

    @property
    def timezone(self) -> datetime.timezone:
        return datetime.timezone(datetime.timedelta(hours=2))

    @property
    def seasonal_conditions(self) -> SeasonalConditions:
        from .seasonalconditions.thechannel import CONDITIONS

        return CONDITIONS


class FalklandsTheater(ConflictTheater):
    terrain = falklands.Falklands()

    # TODO: https://github.com/dcs-liberation/dcs_liberation/issues/2242
    landmap = None

    # TODO: https://github.com/dcs-liberation/dcs_liberation/issues/2242
    daytime_map = DaytimeMap(
        dawn=(datetime.time(hour=6), datetime.time(hour=9)),
        day=(datetime.time(hour=9), datetime.time(hour=18)),
        dusk=(datetime.time(hour=18), datetime.time(hour=20)),
        night=(datetime.time(hour=0), datetime.time(hour=5)),
    )

    # TODO: https://github.com/dcs-liberation/dcs_liberation/issues/2242
    @property
    def timezone(self) -> datetime.timezone:
        return datetime.timezone(datetime.timedelta(hours=4))

    # TODO: https://github.com/dcs-liberation/dcs_liberation/issues/2242
    @property
    def seasonal_conditions(self) -> SeasonalConditions:
        from .seasonalconditions.caucasus import CONDITIONS

        return CONDITIONS