from __future__ import annotations

import logging
from typing import Optional, TYPE_CHECKING

from game.squadrons import Squadron
from game.squadrons.squadrondef import SquadronDef
from ..ato.flighttype import FlightType
from .campaignairwingconfig import CampaignAirWingConfig, SquadronConfig
from ..dcs.aircrafttype import AircraftType
from ..theater import ControlPoint

if TYPE_CHECKING:
    from game import Game
    from game.coalition import Coalition


class DefaultSquadronAssigner:
    def __init__(
        self, config: CampaignAirWingConfig, game: Game, coalition: Coalition
    ) -> None:
        self.config = config
        self.game = game
        self.coalition = coalition
        self.air_wing = coalition.air_wing

    def assign(self) -> None:
        for control_point in self.game.theater.control_points_for(
            self.coalition.player
        ):
            for squadron_config in self.config.by_location[control_point]:
                squadron_def = self.find_squadron_for(squadron_config, control_point)
                if squadron_def is None:
                    logging.info(
                        f"{self.coalition.faction.name} has no aircraft compatible "
                        f"with {squadron_config.primary} at {control_point}"
                    )
                    continue

                squadron = Squadron.create_from(
                    squadron_def, control_point, self.coalition, self.game
                )
                squadron.set_auto_assignable_mission_types(
                    squadron_config.auto_assignable
                )
                self.air_wing.add_squadron(squadron)

    def find_squadron_for(
        self, config: SquadronConfig, control_point: ControlPoint
    ) -> Optional[SquadronDef]:
        for preferred_aircraft in config.aircraft:
            squadron_def = self.find_preferred_squadron(
                preferred_aircraft, config.primary, control_point
            )
            if squadron_def is not None:
                return squadron_def

        # If we didn't find any of the preferred types we should use any squadron
        # compatible with the primary task.
        squadron_def = self.find_squadron_for_task(config.primary, control_point)
        if squadron_def is not None:
            return squadron_def

        # If we can't find any squadron matching the requirement, we should
        # create one.
        return self.air_wing.squadron_def_generator.generate_for_task(
            config.primary, control_point
        )

    def find_preferred_squadron(
        self, preferred_aircraft: str, task: FlightType, control_point: ControlPoint
    ) -> Optional[SquadronDef]:
        # Attempt to find a squadron with the name in the request.
        squadron_def = self.find_squadron_by_name(
            preferred_aircraft, task, control_point
        )
        if squadron_def is not None:
            return squadron_def

        # If the name didn't match a squadron available to this coalition, try to find
        # an aircraft with the matching name that meets the requirements.
        try:
            aircraft = AircraftType.named(preferred_aircraft)
        except KeyError:
            # No aircraft with this name.
            return None

        if aircraft not in self.coalition.faction.aircrafts:
            return None

        squadron_def = self.find_squadron_for_airframe(aircraft, task, control_point)
        if squadron_def is not None:
            return squadron_def

        # No premade squadron available for this aircraft that meets the requirements,
        # so generate one if possible.
        return self.air_wing.squadron_def_generator.generate_for_aircraft(aircraft)

    @staticmethod
    def squadron_compatible_with(
        squadron: SquadronDef,
        task: FlightType,
        control_point: ControlPoint,
        ignore_base_preference: bool = False,
    ) -> bool:
        if ignore_base_preference:
            return control_point.can_operate(squadron.aircraft)
        return squadron.operates_from(control_point) and task in squadron.mission_types

    def find_squadron_for_airframe(
        self, aircraft: AircraftType, task: FlightType, control_point: ControlPoint
    ) -> Optional[SquadronDef]:
        for squadron in self.air_wing.squadron_defs[aircraft]:
            if not squadron.claimed and self.squadron_compatible_with(
                squadron, task, control_point
            ):
                return squadron
        return None

    def find_squadron_by_name(
        self, name: str, task: FlightType, control_point: ControlPoint
    ) -> Optional[SquadronDef]:
        for squadrons in self.air_wing.squadron_defs.values():
            for squadron in squadrons:
                if (
                    not squadron.claimed
                    and squadron.name == name
                    and self.squadron_compatible_with(
                        squadron, task, control_point, ignore_base_preference=True
                    )
                ):
                    return squadron
        return None

    def find_squadron_for_task(
        self, task: FlightType, control_point: ControlPoint
    ) -> Optional[SquadronDef]:
        for squadrons in self.air_wing.squadron_defs.values():
            for squadron in squadrons:
                if not squadron.claimed and self.squadron_compatible_with(
                    squadron, task, control_point
                ):
                    return squadron
        return None