from __future__ import annotations

import itertools
from functools import cached_property
from pathlib import Path
from typing import Iterator, List, TYPE_CHECKING, Tuple
from uuid import UUID

from dcs import Mission
from dcs.countries import CombinedJointTaskForcesBlue, CombinedJointTaskForcesRed
from dcs.country import Country
from dcs.planes import F_15C
from dcs.ships import HandyWind, LHA_Tarawa, Stennis, USS_Arleigh_Burke_IIa
from dcs.statics import Fortification, Warehouse
from dcs.terrain import Airport
from dcs.unitgroup import PlaneGroup, ShipGroup, StaticGroup, VehicleGroup
from dcs.vehicles import AirDefence, Armor, MissilesSS, Unarmed

from game.positioned import Positioned
from game.profiling import logged_duration
from game.scenery_group import SceneryGroup
from game.theater.controlpoint import (
    Airfield,
    Carrier,
    ControlPoint,
    Fob,
    Lha,
    OffMapSpawn,
)
from game.theater.presetlocation import PresetLocation
from game.utils import Distance, meters

if TYPE_CHECKING:
    from game.theater.conflicttheater import ConflictTheater
    from dcs import Point


class MizCampaignLoader:
    BLUE_COUNTRY = CombinedJointTaskForcesBlue()
    RED_COUNTRY = CombinedJointTaskForcesRed()

    OFF_MAP_UNIT_TYPE = F_15C.id

    CV_UNIT_TYPE = Stennis.id
    LHA_UNIT_TYPE = LHA_Tarawa.id
    FRONT_LINE_UNIT_TYPE = Armor.M_113.id
    SHIPPING_LANE_UNIT_TYPE = HandyWind.id

    FOB_UNIT_TYPE = Unarmed.SKP_11.id
    FARP_HELIPADS_TYPE = ["Invisible FARP", "SINGLE_HELIPAD"]

    OFFSHORE_STRIKE_TARGET_UNIT_TYPE = Fortification.Oil_platform.id
    SHIP_UNIT_TYPE = USS_Arleigh_Burke_IIa.id
    MISSILE_SITE_UNIT_TYPE = MissilesSS.Scud_B.id
    COASTAL_DEFENSE_UNIT_TYPE = MissilesSS.Hy_launcher.id

    COMMAND_CENTER_UNIT_TYPE = Fortification._Command_Center.id
    CONNECTION_NODE_UNIT_TYPE = Fortification.Comms_tower_M.id
    POWER_SOURCE_UNIT_TYPE = Fortification.GeneratorF.id

    # Multiple options for air defenses so campaign designers can more accurately see
    # the coverage of their IADS for the expected type.
    LONG_RANGE_SAM_UNIT_TYPES = {
        AirDefence.Patriot_ln.id,
        AirDefence.S_300PS_5P85C_ln.id,
        AirDefence.S_300PS_5P85D_ln.id,
    }

    MEDIUM_RANGE_SAM_UNIT_TYPES = {
        AirDefence.Hawk_ln.id,
        AirDefence.S_75M_Volhov.id,
        AirDefence.X_5p73_s_125_ln.id,
    }

    SHORT_RANGE_SAM_UNIT_TYPES = {
        AirDefence.M1097_Avenger.id,
        AirDefence.Rapier_fsa_launcher.id,
        AirDefence.X_2S6_Tunguska.id,
        AirDefence.Strela_1_9P31.id,
    }

    AAA_UNIT_TYPES = {
        AirDefence.Flak18.id,
        AirDefence.Vulcan.id,
        AirDefence.ZSU_23_4_Shilka.id,
    }

    EWR_UNIT_TYPE = AirDefence.X_1L13_EWR.id

    ARMOR_GROUP_UNIT_TYPE = Armor.M_1_Abrams.id

    FACTORY_UNIT_TYPE = Fortification.Workshop_A.id

    AMMUNITION_DEPOT_UNIT_TYPE = Warehouse._Ammunition_depot.id

    STRIKE_TARGET_UNIT_TYPE = Fortification.Tech_combine.id

    def __init__(self, miz: Path, theater: ConflictTheater) -> None:
        self.theater = theater
        self.mission = Mission()
        with logged_duration("Loading miz"):
            self.mission.load_file(str(miz))

        # If there are no red carriers there usually aren't red units. Make sure
        # both countries are initialized so we don't have to deal with None.
        if self.mission.country(self.BLUE_COUNTRY.name) is None:
            self.mission.coalition["blue"].add_country(self.BLUE_COUNTRY)
        if self.mission.country(self.RED_COUNTRY.name) is None:
            self.mission.coalition["red"].add_country(self.RED_COUNTRY)

    def control_point_from_airport(
        self, airport: Airport, ctld_zones: List[Tuple[Point, float]]
    ) -> ControlPoint:
        cp = Airfield(
            airport, self.theater, starts_blue=airport.is_blue(), ctld_zones=ctld_zones
        )

        # Use the unlimited aircraft option to determine if an airfield should
        # be owned by the player when the campaign is "inverted".
        cp.captured_invert = airport.unlimited_aircrafts

        return cp

    def country(self, blue: bool) -> Country:
        country = self.mission.country(
            self.BLUE_COUNTRY.name if blue else self.RED_COUNTRY.name
        )
        # Should be guaranteed because we initialized them.
        assert country
        return country

    @property
    def blue(self) -> Country:
        return self.country(blue=True)

    @property
    def red(self) -> Country:
        return self.country(blue=False)

    def off_map_spawns(self, blue: bool) -> Iterator[PlaneGroup]:
        for group in self.country(blue).plane_group:
            if group.units[0].type == self.OFF_MAP_UNIT_TYPE:
                yield group

    def carriers(self, blue: bool) -> Iterator[ShipGroup]:
        for group in self.country(blue).ship_group:
            if group.units[0].type == self.CV_UNIT_TYPE:
                yield group

    def lhas(self, blue: bool) -> Iterator[ShipGroup]:
        for group in self.country(blue).ship_group:
            if group.units[0].type == self.LHA_UNIT_TYPE:
                yield group

    def fobs(self, blue: bool) -> Iterator[VehicleGroup]:
        for group in self.country(blue).vehicle_group:
            if group.units[0].type == self.FOB_UNIT_TYPE:
                yield group

    @property
    def ships(self) -> Iterator[ShipGroup]:
        for group in self.red.ship_group:
            if group.units[0].type == self.SHIP_UNIT_TYPE:
                yield group

    @property
    def offshore_strike_targets(self) -> Iterator[StaticGroup]:
        for group in self.red.static_group:
            if group.units[0].type == self.OFFSHORE_STRIKE_TARGET_UNIT_TYPE:
                yield group

    @property
    def missile_sites(self) -> Iterator[VehicleGroup]:
        for group in self.red.vehicle_group:
            if group.units[0].type == self.MISSILE_SITE_UNIT_TYPE:
                yield group

    @property
    def coastal_defenses(self) -> Iterator[VehicleGroup]:
        for group in self.red.vehicle_group:
            if group.units[0].type == self.COASTAL_DEFENSE_UNIT_TYPE:
                yield group

    @property
    def long_range_sams(self) -> Iterator[VehicleGroup]:
        for group in self.red.vehicle_group:
            if group.units[0].type in self.LONG_RANGE_SAM_UNIT_TYPES:
                yield group

    @property
    def medium_range_sams(self) -> Iterator[VehicleGroup]:
        for group in self.red.vehicle_group:
            if group.units[0].type in self.MEDIUM_RANGE_SAM_UNIT_TYPES:
                yield group

    @property
    def short_range_sams(self) -> Iterator[VehicleGroup]:
        for group in self.red.vehicle_group:
            if group.units[0].type in self.SHORT_RANGE_SAM_UNIT_TYPES:
                yield group

    @property
    def aaa(self) -> Iterator[VehicleGroup]:
        for group in itertools.chain(self.blue.vehicle_group, self.red.vehicle_group):
            if group.units[0].type in self.AAA_UNIT_TYPES:
                yield group

    @property
    def ewrs(self) -> Iterator[VehicleGroup]:
        for group in self.red.vehicle_group:
            if group.units[0].type in self.EWR_UNIT_TYPE:
                yield group

    @property
    def armor_groups(self) -> Iterator[VehicleGroup]:
        for group in itertools.chain(self.blue.vehicle_group, self.red.vehicle_group):
            if group.units[0].type in self.ARMOR_GROUP_UNIT_TYPE:
                yield group

    @property
    def helipads(self) -> Iterator[StaticGroup]:
        for group in itertools.chain(self.blue.static_group, self.red.static_group):
            if group.units[0].type in self.FARP_HELIPADS_TYPE:
                yield group

    @property
    def factories(self) -> Iterator[StaticGroup]:
        for group in self.blue.static_group:
            if group.units[0].type in self.FACTORY_UNIT_TYPE:
                yield group

    @property
    def ammunition_depots(self) -> Iterator[StaticGroup]:
        for group in itertools.chain(self.blue.static_group, self.red.static_group):
            if group.units[0].type in self.AMMUNITION_DEPOT_UNIT_TYPE:
                yield group

    @property
    def strike_targets(self) -> Iterator[StaticGroup]:
        for group in itertools.chain(self.blue.static_group, self.red.static_group):
            if group.units[0].type in self.STRIKE_TARGET_UNIT_TYPE:
                yield group

    @property
    def scenery(self) -> List[SceneryGroup]:
        return SceneryGroup.from_trigger_zones(self.mission.triggers._zones)

    @cached_property
    def control_points(self) -> dict[UUID, ControlPoint]:
        control_points = {}
        for airport in self.mission.terrain.airport_list():
            if airport.is_blue() or airport.is_red():
                ctld_zones = self.get_ctld_zones(airport.name)
                control_point = self.control_point_from_airport(airport, ctld_zones)
                control_points[control_point.id] = control_point

        for blue in (False, True):
            for group in self.off_map_spawns(blue):
                control_point = OffMapSpawn(
                    str(group.name), group.position, self.theater, starts_blue=blue
                )
                control_point.captured_invert = group.late_activation
                control_points[control_point.id] = control_point
            for ship in self.carriers(blue):
                control_point = Carrier(
                    ship.name, ship.position, self.theater, starts_blue=blue
                )
                control_point.captured_invert = ship.late_activation
                control_points[control_point.id] = control_point
            for ship in self.lhas(blue):
                control_point = Lha(
                    ship.name, ship.position, self.theater, starts_blue=blue
                )
                control_point.captured_invert = ship.late_activation
                control_points[control_point.id] = control_point
            for fob in self.fobs(blue):
                ctld_zones = self.get_ctld_zones(fob.name)
                control_point = Fob(
                    str(fob.name),
                    fob.position,
                    self.theater,
                    starts_blue=blue,
                    ctld_zones=ctld_zones,
                )
                control_point.captured_invert = fob.late_activation
                control_points[control_point.id] = control_point

        return control_points

    @property
    def front_line_path_groups(self) -> Iterator[VehicleGroup]:
        for group in self.country(blue=True).vehicle_group:
            if group.units[0].type == self.FRONT_LINE_UNIT_TYPE:
                yield group

    @property
    def shipping_lane_groups(self) -> Iterator[ShipGroup]:
        for group in self.country(blue=True).ship_group:
            if group.units[0].type == self.SHIPPING_LANE_UNIT_TYPE:
                yield group

    @property
    def iads_command_centers(self) -> Iterator[StaticGroup]:
        for group in itertools.chain(self.blue.static_group, self.red.static_group):
            if group.units[0].type in self.COMMAND_CENTER_UNIT_TYPE:
                yield group

    @property
    def iads_connection_nodes(self) -> Iterator[StaticGroup]:
        for group in itertools.chain(self.blue.static_group, self.red.static_group):
            if group.units[0].type in self.CONNECTION_NODE_UNIT_TYPE:
                yield group

    @property
    def iads_power_sources(self) -> Iterator[StaticGroup]:
        for group in itertools.chain(self.blue.static_group, self.red.static_group):
            if group.units[0].type in self.POWER_SOURCE_UNIT_TYPE:
                yield group

    def add_supply_routes(self) -> None:
        for group in self.front_line_path_groups:
            # The unit will have its first waypoint at the source CP and the final
            # waypoint at the destination CP. Each waypoint defines the path of the
            # cargo ship.
            waypoints = [p.position for p in group.points]
            origin = self.theater.closest_control_point(waypoints[0])
            if origin is None:
                raise RuntimeError(
                    f"No control point near the first waypoint of {group.name}"
                )
            destination = self.theater.closest_control_point(waypoints[-1])
            if destination is None:
                raise RuntimeError(
                    f"No control point near the final waypoint of {group.name}"
                )

            self.control_points[origin.id].create_convoy_route(destination, waypoints)
            self.control_points[destination.id].create_convoy_route(
                origin, list(reversed(waypoints))
            )

    def add_shipping_lanes(self) -> None:
        for group in self.shipping_lane_groups:
            # The unit will have its first waypoint at the source CP and the final
            # waypoint at the destination CP. Each waypoint defines the path of the
            # cargo ship.
            waypoints = [p.position for p in group.points]
            origin = self.theater.closest_control_point(waypoints[0])
            if origin is None:
                raise RuntimeError(
                    f"No control point near the first waypoint of {group.name}"
                )
            destination = self.theater.closest_control_point(waypoints[-1])
            if destination is None:
                raise RuntimeError(
                    f"No control point near the final waypoint of {group.name}"
                )

            self.control_points[origin.id].create_shipping_lane(destination, waypoints)
            self.control_points[destination.id].create_shipping_lane(
                origin, list(reversed(waypoints))
            )

    def objective_info(
        self, near: Positioned, allow_naval: bool = False
    ) -> Tuple[ControlPoint, Distance]:
        closest = self.theater.closest_control_point(near.position, allow_naval)
        distance = meters(closest.position.distance_to_point(near.position))
        return closest, distance

    def add_preset_locations(self) -> None:
        for static in self.offshore_strike_targets:
            closest, distance = self.objective_info(static)
            closest.preset_locations.offshore_strike_locations.append(
                PresetLocation.from_group(static)
            )

        for ship in self.ships:
            closest, distance = self.objective_info(ship, allow_naval=True)
            closest.preset_locations.ships.append(PresetLocation.from_group(ship))

        for group in self.missile_sites:
            closest, distance = self.objective_info(group)
            closest.preset_locations.missile_sites.append(
                PresetLocation.from_group(group)
            )

        for group in self.coastal_defenses:
            closest, distance = self.objective_info(group)
            closest.preset_locations.coastal_defenses.append(
                PresetLocation.from_group(group)
            )

        for group in self.long_range_sams:
            closest, distance = self.objective_info(group)
            closest.preset_locations.long_range_sams.append(
                PresetLocation.from_group(group)
            )

        for group in self.medium_range_sams:
            closest, distance = self.objective_info(group)
            closest.preset_locations.medium_range_sams.append(
                PresetLocation.from_group(group)
            )

        for group in self.short_range_sams:
            closest, distance = self.objective_info(group)
            closest.preset_locations.short_range_sams.append(
                PresetLocation.from_group(group)
            )

        for group in self.aaa:
            closest, distance = self.objective_info(group)
            closest.preset_locations.aaa.append(PresetLocation.from_group(group))

        for group in self.ewrs:
            closest, distance = self.objective_info(group)
            closest.preset_locations.ewrs.append(PresetLocation.from_group(group))

        for group in self.armor_groups:
            closest, distance = self.objective_info(group)
            closest.preset_locations.armor_groups.append(
                PresetLocation.from_group(group)
            )

        for static in self.helipads:
            closest, distance = self.objective_info(static)
            closest.helipads.append(PresetLocation.from_group(static))

        for static in self.factories:
            closest, distance = self.objective_info(static)
            closest.preset_locations.factories.append(PresetLocation.from_group(static))

        for static in self.ammunition_depots:
            closest, distance = self.objective_info(static)
            closest.preset_locations.ammunition_depots.append(
                PresetLocation.from_group(static)
            )

        for static in self.strike_targets:
            closest, distance = self.objective_info(static)
            closest.preset_locations.strike_locations.append(
                PresetLocation.from_group(static)
            )

        for iads_command_center in self.iads_command_centers:
            closest, distance = self.objective_info(iads_command_center)
            closest.preset_locations.iads_command_center.append(
                PresetLocation.from_group(iads_command_center)
            )

        for iads_connection_node in self.iads_connection_nodes:
            closest, distance = self.objective_info(iads_connection_node)
            closest.preset_locations.iads_connection_node.append(
                PresetLocation.from_group(iads_connection_node)
            )

        for iads_power_source in self.iads_power_sources:
            closest, distance = self.objective_info(iads_power_source)
            closest.preset_locations.iads_power_source.append(
                PresetLocation.from_group(iads_power_source)
            )

        for scenery_group in self.scenery:
            closest, distance = self.objective_info(scenery_group)
            closest.preset_locations.scenery.append(scenery_group)

    def populate_theater(self) -> None:
        for control_point in self.control_points.values():
            self.theater.add_controlpoint(control_point)
        self.add_preset_locations()
        self.add_supply_routes()
        self.add_shipping_lanes()

    def get_ctld_zones(self, prefix: str) -> List[Tuple[Point, float]]:
        zones = [t for t in self.mission.triggers.zones() if prefix + " CTLD" in t.name]
        for z in zones:
            self.mission.triggers.zones().remove(z)
        return [(z.position, z.radius) for z in zones]