from __future__ import annotations

import itertools
from collections import defaultdict
from typing import Iterator, Optional, Sequence, TYPE_CHECKING

from game.ato.closestairfields import ObjectiveDistanceCache
from game.dcs.aircrafttype import AircraftType
from .squadrondefloader import SquadronDefLoader
from ..campaignloader.squadrondefgenerator import SquadronDefGenerator
from ..factions.faction import Faction
from ..theater import ControlPoint, MissionTarget

if TYPE_CHECKING:
    from game.game import Game
    from ..ato.flighttype import FlightType
    from .squadron import Squadron


class AirWing:
    def __init__(self, player: bool, game: Game, faction: Faction) -> None:
        self.player = player
        self.squadrons: dict[AircraftType, list[Squadron]] = defaultdict(list)
        self.squadron_defs = SquadronDefLoader(game, faction).load()
        self.squadron_def_generator = SquadronDefGenerator(faction)
        self.settings = game.settings

    def unclaim_squadron_def(self, squadron: Squadron) -> None:
        if squadron.aircraft in self.squadron_defs:
            for squadron_def in self.squadron_defs[squadron.aircraft]:
                if squadron_def.claimed and squadron_def.name == squadron.name:
                    squadron_def.claimed = False

    def add_squadron(self, squadron: Squadron) -> None:
        self.squadrons[squadron.aircraft].append(squadron)

    def squadrons_for(self, aircraft: AircraftType) -> Sequence[Squadron]:
        return self.squadrons[aircraft]

    def can_auto_plan(self, task: FlightType) -> bool:
        try:
            next(self.auto_assignable_for_task(task))
            return True
        except StopIteration:
            return False

    def best_squadrons_for(
        self,
        location: MissionTarget,
        task: FlightType,
        size: int,
        heli: bool,
        this_turn: bool,
    ) -> list[Squadron]:
        airfield_cache = ObjectiveDistanceCache.get_closest_airfields(location)
        best_aircraft = AircraftType.priority_list_for_task(task)
        ordered: list[Squadron] = []
        for control_point in airfield_cache.operational_airfields:
            if control_point.captured != self.player:
                continue
            capable_at_base = []
            for squadron in control_point.squadrons:
                if squadron.can_auto_assign_mission(
                    location, task, size, heli, this_turn
                ):
                    capable_at_base.append(squadron)
                    if squadron.aircraft not in best_aircraft:
                        # If it is not already in the list it should be the last one
                        best_aircraft.append(squadron.aircraft)

            ordered.extend(
                sorted(
                    capable_at_base,
                    key=lambda s: best_aircraft.index(s.aircraft),
                )
            )

        return sorted(
            ordered,
            key=lambda s: (
                # This looks like the opposite of what we want because False sorts
                # before True.
                s.primary_task != task,
                s.location.distance_to(location),
            ),
        )

    def best_squadron_for(
        self,
        location: MissionTarget,
        task: FlightType,
        size: int,
        heli: bool,
        this_turn: bool,
    ) -> Optional[Squadron]:
        for squadron in self.best_squadrons_for(location, task, size, heli, this_turn):
            return squadron
        return None

    def best_available_aircrafts_for(self, task: FlightType) -> list[AircraftType]:
        """Returns an ordered list of available aircrafts for the given task"""
        aircrafts = []
        best_aircraft_for_task = AircraftType.priority_list_for_task(task)
        for aircraft, squadrons in self.squadrons.items():
            for squadron in squadrons:
                if squadron.untasked_aircraft and squadron.capable_of(task):
                    aircrafts.append(aircraft)
                    if aircraft not in best_aircraft_for_task:
                        best_aircraft_for_task.append(aircraft)
                    break
        # Sort the list ordered by the best capability
        return sorted(
            aircrafts,
            key=lambda ac: best_aircraft_for_task.index(ac),
        )

    def auto_assignable_for_task(self, task: FlightType) -> Iterator[Squadron]:
        for squadron in self.iter_squadrons():
            if squadron.can_auto_assign(task):
                yield squadron

    def auto_assignable_for_task_at(
        self, task: FlightType, base: ControlPoint
    ) -> Iterator[Squadron]:
        for squadron in self.iter_squadrons():
            if squadron.can_auto_assign(task) and squadron.location == base:
                yield squadron

    def squadron_for(self, aircraft: AircraftType) -> Squadron:
        return self.squadrons_for(aircraft)[0]

    def iter_squadrons(self) -> Iterator[Squadron]:
        return itertools.chain.from_iterable(self.squadrons.values())

    def squadron_at_index(self, index: int) -> Squadron:
        return list(self.iter_squadrons())[index]

    def populate_for_turn_0(self, squadrons_start_full: bool) -> None:
        for squadron in self.iter_squadrons():
            squadron.populate_for_turn_0(squadrons_start_full)

    def end_turn(self) -> None:
        for squadron in self.iter_squadrons():
            squadron.end_turn()

    def reset(self) -> None:
        for squadron in self.iter_squadrons():
            squadron.return_all_pilots_and_aircraft()

    @property
    def size(self) -> int:
        return sum(len(s) for s in self.squadrons.values())