from collections import defaultdict
from typing import Iterable, Iterator, Optional, Any

import yaml
from PySide6.QtCore import (
    QItemSelection,
    QItemSelectionModel,
    QSize,
    Qt,
    Signal,
)
from PySide6.QtGui import QIcon, QStandardItem, QStandardItemModel
from PySide6.QtWidgets import (
    QComboBox,
    QDialog,
    QHBoxLayout,
    QLabel,
    QLineEdit,
    QListView,
    QScrollArea,
    QStackedLayout,
    QTabWidget,
    QTextEdit,
    QVBoxLayout,
    QWidget,
    QCheckBox,
    QPushButton,
    QGridLayout,
    QToolButton,
    QMessageBox,
    QSpinBox,
    QGroupBox,
    QFileDialog,
)
from dcs.mapping import Point

from game import Game
from game.ato.flighttype import FlightType
from game.campaignloader.campaignairwingconfig import (
    DEFAULT_SQUADRON_SIZE,
    CampaignAirWingConfig,
)
from game.coalition import Coalition
from game.dcs.aircrafttype import AircraftType
from game.persistency import airwing_dir
from game.squadrons import AirWing, Pilot, Squadron
from game.squadrons.squadrondef import SquadronDef
from game.theater import ControlPoint, ParkingType, Airfield
from qt_ui.uiconstants import AIRCRAFT_ICONS, ICONS
from qt_ui.widgets.combos.QSquadronLiverySelector import SquadronLiverySelector
from qt_ui.widgets.combos.primarytaskselector import PrimaryTaskSelector


class QMissionType(QCheckBox):
    def __init__(
        self, mission_type: FlightType, allowed: bool, auto_assignable: bool
    ) -> None:
        super().__init__()
        self.flight_type = mission_type
        self.setEnabled(allowed)
        self.setChecked(auto_assignable)

    @property
    def auto_assignable(self) -> bool:
        return self.isChecked()


class MissionTypeControls(QGridLayout):
    def __init__(self, squadron: Squadron) -> None:
        super().__init__()
        self.squadron = squadron
        self.mission_types: list[QMissionType] = []

        self.addWidget(QLabel("Mission Type"), 0, 0)
        self.addWidget(QLabel("Auto-Assign"), 0, 1)

        for i, task in enumerate(FlightType):
            if task is FlightType.FERRY:
                # Not plannable so just skip it.
                continue
            auto_assignable = task in squadron.auto_assignable_mission_types
            mission_type = QMissionType(
                task, squadron.capable_of(task), auto_assignable
            )
            self.mission_types.append(mission_type)

            self.addWidget(QLabel(task.value), i + 1, 0)
            self.addWidget(mission_type, i + 1, 1)

    @property
    def auto_assignable_mission_types(self) -> Iterator[FlightType]:
        for mission_type in self.mission_types:
            if mission_type.auto_assignable:
                yield mission_type.flight_type

    def replace_squadron(self, squadron: Squadron) -> None:
        self.squadron = squadron
        for mission_type in self.mission_types:
            mission_type.setChecked(
                mission_type.flight_type in self.squadron.auto_assignable_mission_types
            )


class SquadronBaseSelector(QComboBox):
    """A combo box for selecting a squadrons home air base.

    The combo box will automatically be populated with all air bases compatible with the
    squadron.
    """

    def __init__(
        self,
        bases: Iterable[ControlPoint],
        selected_base: Optional[ControlPoint],
        aircraft_type: Optional[AircraftType],
    ) -> None:
        super().__init__()
        self.setSizeAdjustPolicy(QComboBox.SizeAdjustPolicy.AdjustToContents)
        self.bases = list(bases)
        self.set_aircraft_type(aircraft_type)

        if selected_base:
            self.setCurrentText(selected_base.name)
        # TODO can we get a prefered base if none is selected?

    def set_aircraft_type(self, aircraft_type: Optional[AircraftType]):
        self.clear()
        if aircraft_type:
            for base in self.bases:
                if not base.can_operate(aircraft_type) and not isinstance(
                    base, Airfield
                ):
                    continue
                self.addItem(base.name, base)
            self.model().sort(0)
            self.setEnabled(True)
        else:
            self.addItem("Select aircraft type first", None)
            self.setEnabled(False)
        self.update()


class SquadronSizeSpinner(QSpinBox):
    def __init__(self, starting_size: int, parent: QWidget | None) -> None:
        super().__init__(parent)

        # Disable text editing, which wouldn't work in the first place, but also
        # obnoxiously selects the text on change (highlighting it) and leaves a flashing
        # cursor in the middle of the element when clicked.
        self.lineEdit().setEnabled(False)

        self.setMinimum(1)
        self.setValue(starting_size)

    # def sizeHint(self) -> QSize:
    #     # The default size hinting fails to deal with label width, and will truncate
    #     # "Paused".
    #     size = super().sizeHint()
    #     size.setWidth(86)
    #     return size


class AirWingConfigParkingTracker(QWidget):
    allocation_changed = Signal()

    def __init__(self, squadrons: Iterable[Squadron]) -> None:
        super().__init__()
        self.by_cp: dict[ControlPoint, set[Squadron]] = defaultdict(set)
        for squadron in squadrons:
            self.add_squadron(squadron)

    def add_squadron(self, squadron: Squadron) -> None:
        self.by_cp[squadron.location].add(squadron)
        self.signal_change()

    def remove_squadron(self, squadron: Squadron) -> None:
        self.by_cp[squadron.location].remove(squadron)
        self.signal_change()

    def relocate_squadron(
        self,
        squadron: Squadron,
        prior_location: ControlPoint,
        new_location: ControlPoint,
    ) -> None:
        self.by_cp[prior_location].remove(squadron)
        self.by_cp[new_location].add(squadron)
        squadron.relocate_to(new_location)
        self.signal_change()

    def used_parking_at(self, control_point: ControlPoint) -> int:
        return sum(s.max_size for s in self.by_cp[control_point])

    def signal_change(self) -> None:
        self.allocation_changed.emit()


class SquadronConfigurationBox(QGroupBox):
    remove_squadron_signal = Signal(Squadron)

    def __init__(
        self,
        game: Game,
        coalition: Coalition,
        squadron: Squadron,
        parking_tracker: AirWingConfigParkingTracker,
        aircraft_present: bool,
    ) -> None:
        super().__init__()
        self.game = game
        self.coalition = coalition
        self.squadron = squadron
        self.parking_tracker = parking_tracker
        self.aircraft_present = aircraft_present

        columns = QHBoxLayout()
        self.setLayout(columns)

        left_column = QVBoxLayout()
        columns.addLayout(left_column)

        left_column.addWidget(QLabel("Name:"))
        self.name_edit = QLineEdit(squadron.name)
        self.name_edit.textChanged.connect(lambda x: self.reset_title())
        left_column.addWidget(self.name_edit)

        self.reset_title()

        nickname_edit_layout = QGridLayout()
        left_column.addLayout(nickname_edit_layout)

        nickname_edit_layout.addWidget(QLabel("Nickname:"), 0, 0, 1, 2)
        self.nickname_edit = QLineEdit(squadron.nickname)
        nickname_edit_layout.addWidget(
            self.nickname_edit, 1, 0, Qt.AlignmentFlag.AlignTop
        )
        reroll_nickname_button = QToolButton()
        reroll_nickname_button.setIcon(QIcon(ICONS["Reload"]))
        reroll_nickname_button.setToolTip("Re-roll nickname")
        reroll_nickname_button.clicked.connect(self.reroll_nickname)
        nickname_edit_layout.addWidget(
            reroll_nickname_button, 1, 1, Qt.AlignmentFlag.AlignTop
        )

        left_column.addWidget(QLabel("Livery:"))
        self.livery_selector = SquadronLiverySelector(squadron)
        left_column.addWidget(self.livery_selector)

        task_and_size_row = QHBoxLayout()
        left_column.addLayout(task_and_size_row)

        size_column = QVBoxLayout()
        task_and_size_row.addLayout(size_column)
        size_column.addWidget(QLabel("Max size:"))
        self.max_size_selector = SquadronSizeSpinner(self.squadron.max_size, self)
        self.max_size_selector.valueChanged.connect(self.update_max_size)
        size_column.addWidget(self.max_size_selector)

        task_column = QVBoxLayout()
        task_and_size_row.addLayout(task_column)
        task_column.addWidget(QLabel("Primary task:"))
        self.primary_task_selector = PrimaryTaskSelector.for_squadron(self.squadron)
        task_column.addWidget(self.primary_task_selector)

        left_column.addWidget(QLabel("Base:"))
        self.base_selector = SquadronBaseSelector(
            game.theater.control_points_for(squadron.player),
            squadron.location,
            squadron.aircraft,
        )
        self.base_selector.currentIndexChanged.connect(self.relocate_squadron)
        left_column.addWidget(self.base_selector)

        self.parking_label = QLabel()
        self.update_parking_label()
        self.parking_tracker.allocation_changed.connect(self.update_parking_label)
        left_column.addWidget(self.parking_label)

        if not squadron.player and squadron.aircraft.flyable:
            player_label = QLabel("Player slots not available for opfor")
        elif not squadron.aircraft.flyable:
            player_label = QLabel("Player slots not available for non-flyable aircraft")
        else:
            msg1 = "Player slots not available for opfor"
            msg2 = "Player slots not available for non-flyable aircraft"
            text = msg2 if squadron.player else msg1
            player_label = QLabel(text)
        left_column.addWidget(player_label)

        self.player_list = QTextEdit(
            "<br />".join(p.name for p in self.claim_players_from_squadron())
        )
        self.player_list.setAcceptRichText(False)
        self.player_list.setEnabled(squadron.player and squadron.aircraft.flyable)
        left_column.addWidget(self.player_list)

        button_row = QHBoxLayout()
        left_column.addLayout(button_row)
        left_column.addStretch()

        delete_button = QPushButton("Remove Squadron")
        delete_button.setMaximumWidth(140)
        delete_button.clicked.connect(self.remove_from_squadron_config)
        button_row.addWidget(delete_button)

        replace_button = QPushButton("Replace with preset")
        replace_button.setMaximumWidth(140)
        replace_button.clicked.connect(self.replace_with_preset)
        button_row.addWidget(replace_button)
        button_row.addStretch()

        right_column = QVBoxLayout()
        self.mission_types = MissionTypeControls(squadron)
        right_column.addLayout(self.mission_types)
        right_column.addStretch()
        columns.addLayout(right_column)

    def bind_data(self) -> None:
        old_state = self.blockSignals(True)
        try:
            self.name_edit.setText(self.squadron.name)
            self.nickname_edit.setText(self.squadron.nickname)
            self.primary_task_selector.setCurrentText(self.squadron.primary_task.value)
            index = self.livery_selector.findText(self.squadron.livery)
            self.livery_selector.setCurrentIndex(index)
            self.max_size_selector.setValue(self.squadron.max_size)
            self.base_selector.setCurrentText(self.squadron.location.name)
            self.player_list.setText(
                "<br />".join(p.name for p in self.claim_players_from_squadron())
            )
            self.update_parking_label()
        finally:
            self.blockSignals(old_state)

    def update_parking_label(self) -> None:
        required_slots = self.parking_tracker.used_parking_at(self.squadron.location)
        required_slots_string = (
            f"Parking slots required: {required_slots}<br/>"
            if self.aircraft_present
            else ""
        )
        total_slots = self.squadron.location.total_aircraft_parking(
            ParkingType().from_aircraft(
                self.squadron.aircraft, self.game.settings.ground_start_ai_planes
            )
        )
        slots = "N/A"
        if ap := self.squadron.location.dcs_airport:
            slots = len(ap.free_parking_slots(self.squadron.aircraft.dcs_unit_type))
        self.parking_label.setText(
            f"{required_slots_string}"
            f"Total parking slots available: {total_slots}<br/>"
            f"Number of parking slots for {self.squadron.aircraft.dcs_id} that fit: {slots}"
        )

    def update_max_size(self) -> None:
        self.squadron.max_size = self.max_size_selector.value()
        self.parking_tracker.signal_change()

    def relocate_squadron(self) -> None:
        location = self.base_selector.currentData()
        self.parking_tracker.relocate_squadron(
            self.squadron, self.squadron.location, location
        )

    def remove_from_squadron_config(self) -> None:
        self.remove_squadron_signal.emit(self.squadron)

    def pick_replacement_squadron(self) -> Optional[Squadron]:
        popup = PresetSquadronSelector(
            self.squadron.aircraft,
            self.coalition.air_wing.squadron_defs,
        )
        if popup.exec_() != QDialog.DialogCode.Accepted:
            return None

        selected_def = popup.squadron_def_selector.currentData()

        self.squadron.coalition.air_wing.unclaim_squadron_def(self.squadron)
        squadron = Squadron.create_from(
            selected_def,
            self.squadron.primary_task,
            self.squadron.max_size,
            self.squadron.location,
            self.coalition,
            self.game,
        )
        return squadron

    def claim_players_from_squadron(self) -> list[Pilot]:
        if not self.squadron.player:
            return []

        players = [p for p in self.squadron.pilot_pool if p.player]
        for player in players:
            self.squadron.pilot_pool.remove(player)
        return players

    def return_players_to_squadron(self) -> None:
        if not self.squadron.player:
            return

        player_names = self.player_list.toPlainText().splitlines()
        # Prepend player pilots so they get set active first.
        self.squadron.pilot_pool = [
            Pilot(n, player=True) for n in player_names
        ] + self.squadron.pilot_pool

    def replace_with_preset(self) -> None:
        new_squadron = self.pick_replacement_squadron()
        if new_squadron is None:
            # The user canceled the dialog.
            return
        self.return_players_to_squadron()
        self.parking_tracker.remove_squadron(self.squadron)
        self.squadron = new_squadron
        self.parking_tracker.add_squadron(self.squadron)
        self.bind_data()
        self.mission_types.replace_squadron(self.squadron)
        self.parking_tracker.signal_change()

    def reset_title(self) -> None:
        self.setTitle(f"{self.name_edit.text()} - {self.squadron.aircraft}")

    def reroll_nickname(self) -> None:
        self.nickname_edit.setText(
            self.squadron.coalition.air_wing.squadron_def_generator.random_nickname()
        )

    def apply(self) -> Squadron:
        self.squadron.name = self.name_edit.text()
        self.squadron.nickname = self.nickname_edit.text()
        self.squadron.max_size = self.max_size_selector.value()
        if (primary_task := self.primary_task_selector.selected_task) is not None:
            self.squadron.primary_task = primary_task
        else:
            raise RuntimeError("Primary task cannot be none")
        base = self.base_selector.currentData()
        if base is None:
            raise RuntimeError("Base cannot be none")
        self.squadron.assign_to_base(base)
        self.return_players_to_squadron()

        # Also update the auto assignable mission types
        self.squadron.set_auto_assignable_mission_types(
            set(self.mission_types.auto_assignable_mission_types)
        )
        return self.squadron


class SquadronConfigurationLayout(QVBoxLayout):
    config_changed = Signal(AircraftType)

    def __init__(
        self,
        game: Game,
        coalition: Coalition,
        squadrons: list[Squadron],
        parking_tracker: AirWingConfigParkingTracker,
        aircraft_present: bool,
    ) -> None:
        super().__init__()
        self.game = game
        self.coalition = coalition
        self.squadron_configs = []
        self.parking_tracker = parking_tracker
        self.aircraft_present = aircraft_present
        for squadron in squadrons:
            self.add_squadron(squadron)

    def apply(self) -> list[Squadron]:
        keep_squadrons = []
        for squadron_config in self.squadron_configs:
            keep_squadrons.append(squadron_config.apply())
        return keep_squadrons

    def remove_squadron(self, squadron: Squadron) -> None:
        self.parking_tracker.remove_squadron(squadron)
        for squadron_config in self.squadron_configs:
            if squadron_config.squadron == squadron:
                squadron_config.deleteLater()
                self.squadron_configs.remove(squadron_config)
                squadron.coalition.air_wing.unclaim_squadron_def(squadron)
                self.update()
                self.config_changed.emit(squadron.aircraft)
                return

    def add_squadron(self, squadron: Squadron) -> None:
        squadron_config = SquadronConfigurationBox(
            self.game,
            self.coalition,
            squadron,
            self.parking_tracker,
            self.aircraft_present,
        )
        squadron_config.remove_squadron_signal.connect(self.remove_squadron)
        self.squadron_configs.append(squadron_config)
        self.addWidget(squadron_config)
        self.parking_tracker.add_squadron(squadron)


class AircraftSquadronsPage(QWidget):
    remove_squadron_page = Signal(AircraftType)

    def __init__(
        self,
        game: Game,
        coalition: Coalition,
        squadrons: list[Squadron],
        parking_tracker: AirWingConfigParkingTracker,
        aircraft_present: bool,
    ) -> None:
        super().__init__()
        layout = QVBoxLayout()
        self.setLayout(layout)

        self.squadrons_config = SquadronConfigurationLayout(
            game, coalition, squadrons, parking_tracker, aircraft_present
        )
        self.squadrons_config.config_changed.connect(self.on_squadron_config_changed)

        scrolling_widget = QWidget()
        scrolling_widget.setLayout(self.squadrons_config)

        scrolling_area = QScrollArea()
        scrolling_area.setHorizontalScrollBarPolicy(
            Qt.ScrollBarPolicy.ScrollBarAlwaysOff
        )
        scrolling_area.setWidgetResizable(True)
        scrolling_area.setWidget(scrolling_widget)

        layout.addWidget(scrolling_area)

    def on_squadron_config_changed(self, aircraft_type: AircraftType):
        if len(self.squadrons_config.squadron_configs) == 0:
            self.remove_squadron_page.emit(aircraft_type)

    def add_squadron_to_page(self, squadron: Squadron):
        self.squadrons_config.add_squadron(squadron)

    def apply(self) -> list[Squadron]:
        return self.squadrons_config.apply()


class AircraftSquadronsPanel(QStackedLayout):
    page_removed = Signal(AircraftType)

    def __init__(
        self,
        game: Game,
        coalition: Coalition,
        parking_tracker: AirWingConfigParkingTracker,
        aircraft_present: bool,
    ) -> None:
        super().__init__()
        self.game = game
        self.coalition = coalition
        self.parking_tracker = parking_tracker
        self.squadrons_pages: dict[AircraftType, AircraftSquadronsPage] = {}
        self.aircraft_present = aircraft_present
        for aircraft, squadrons in self.air_wing.squadrons.items():
            self.new_page_for_type(aircraft, squadrons)

    @property
    def air_wing(self) -> AirWing:
        return self.coalition.air_wing

    def remove_page_for_type(self, aircraft_type: AircraftType):
        page = self.squadrons_pages[aircraft_type]
        self.removeWidget(page)
        page.deleteLater()
        self.squadrons_pages.pop(aircraft_type)
        self.page_removed.emit(aircraft_type)
        self.update()

    def new_page_for_type(
        self, aircraft_type: AircraftType, squadrons: list[Squadron]
    ) -> None:
        page = AircraftSquadronsPage(
            self.game,
            self.coalition,
            squadrons,
            self.parking_tracker,
            self.aircraft_present,
        )
        page.remove_squadron_page.connect(self.remove_page_for_type)
        self.addWidget(page)
        self.squadrons_pages[aircraft_type] = page

    def add_squadron_to_panel(self, squadron: Squadron):
        # Find existing page or add new one
        if squadron.aircraft in self.squadrons_pages:
            page = self.squadrons_pages[squadron.aircraft]
            page.add_squadron_to_page(squadron)
        else:
            self.new_page_for_type(squadron.aircraft, [squadron])

        self.update()

    def apply(self) -> None:
        self.air_wing.squadrons = {}
        for aircraft, page in self.squadrons_pages.items():
            self.air_wing.squadrons[aircraft] = page.apply()

    def revert(self) -> None:
        for _, page in self.squadrons_pages.items():
            self.removeWidget(page)
        self.squadrons_pages: dict[AircraftType, AircraftSquadronsPage] = {}
        for aircraft, squadrons in self.air_wing.squadrons.items():
            self.new_page_for_type(aircraft, squadrons)
        self.update()


class AircraftTypeList(QListView):
    page_index_changed = Signal(int)

    def __init__(self, air_wing: AirWing) -> None:
        super().__init__()
        self.air_wing = air_wing
        self.setIconSize(QSize(91, 24))
        self.setMinimumWidth(300)

        self.item_model = QStandardItemModel(self)
        self.setModel(self.item_model)

        self.selectionModel().setCurrentIndex(
            self.item_model.index(0, 0), QItemSelectionModel.SelectionFlag.Select
        )
        self.selectionModel().selectionChanged.connect(self.on_selection_changed)
        for aircraft in air_wing.squadrons:
            self.add_aircraft_type(aircraft)

    def remove_aircraft_type(self, aircraft: AircraftType):
        for item in self.item_model.findItems(aircraft.display_name):
            self.item_model.removeRow(item.row())
        self.page_index_changed.emit(self.selectionModel().currentIndex().row())

    def add_aircraft_type(self, aircraft: AircraftType):
        aircraft_item = QStandardItem(aircraft.display_name)
        icon = self.icon_for(aircraft)
        if icon is not None:
            aircraft_item.setIcon(icon)
        aircraft_item.setEditable(False)
        aircraft_item.setSelectable(True)
        self.item_model.appendRow(aircraft_item)

    def on_selection_changed(
        self, selected: QItemSelection, _deselected: QItemSelection
    ) -> None:
        indexes = selected.indexes()
        if len(indexes) > 1:
            raise RuntimeError("Aircraft list should not allow multi-selection")
        if not indexes:
            return
        self.page_index_changed.emit(indexes[0].row())

    @staticmethod
    def icon_for(aircraft: AircraftType) -> Optional[QIcon]:
        # Replace slashes with underscores because slashes are not allowed in filenames
        name = aircraft.dcs_id.replace("/", "_")
        if name in AIRCRAFT_ICONS:
            return QIcon(AIRCRAFT_ICONS[name])
        return None

    def revert(self) -> None:
        self.item_model.clear()
        for aircraft in self.air_wing.squadrons:
            self.add_aircraft_type(aircraft)


class AirWingConfigurationTab(QWidget):
    def __init__(
        self, coalition: Coalition, game: Game, aircraft_present: bool
    ) -> None:
        super().__init__()

        layout = QGridLayout()
        self.setLayout(layout)
        self.game = game
        self.coalition = coalition
        self.parking_tracker = AirWingConfigParkingTracker(
            coalition.air_wing.iter_squadrons()
        )

        self.type_list = AircraftTypeList(coalition.air_wing)

        layout.addWidget(self.type_list, 1, 1, 1, 2)

        add_button = QPushButton("Add Squadron")
        add_button.clicked.connect(lambda state: self.add_squadron())
        layout.addWidget(add_button, 2, 1, 1, 1)

        self.squadrons_panel = AircraftSquadronsPanel(
            game, coalition, self.parking_tracker, aircraft_present
        )
        self.squadrons_panel.page_removed.connect(self.type_list.remove_aircraft_type)
        layout.addLayout(self.squadrons_panel, 1, 3, 2, 1)

        self.type_list.page_index_changed.connect(self.squadrons_panel.setCurrentIndex)

    def add_squadron(self) -> None:
        selected_aircraft = None
        if self.type_list.selectionModel().currentIndex().row() >= 0:
            selected_aircraft = self.type_list.item_model.item(
                self.type_list.selectionModel().currentIndex().row()
            ).text()

        bases = list(self.game.theater.control_points_for(self.coalition.player))

        # List of all Aircrafts possible to operate with the given bases
        possible_aircrafts = {
            aircraft
            for aircraft in self.coalition.faction.all_aircrafts
            if isinstance(aircraft, AircraftType)
            and any(base.can_operate(aircraft) for base in bases)
        }

        popup = SquadronConfigPopup(
            selected_aircraft,
            possible_aircrafts,
            bases,
            self.coalition.air_wing.squadron_defs,
        )
        if popup.exec_() != QDialog.DialogCode.Accepted:
            return

        selected_type = popup.aircraft_type_selector.currentData()
        selected_base = popup.squadron_base_selector.currentData()
        selected_task = popup.primary_task_selector.selected_task
        selected_def = popup.squadron_def_selector.currentData()

        # Let user choose the preset or generate one
        squadron_def = (
            selected_def
            or self.coalition.air_wing.squadron_def_generator.generate_for_aircraft(
                selected_type
            )
        )

        squadron = Squadron.create_from(
            squadron_def,
            selected_task,
            DEFAULT_SQUADRON_SIZE,
            selected_base,
            self.coalition,
            self.game,
        )

        # Add Squadron
        if not self.type_list.item_model.findItems(selected_type.display_name):
            self.type_list.add_aircraft_type(selected_type)
            # TODO Select the newly added type
        self.squadrons_panel.add_squadron_to_panel(squadron)
        self.update()

    def apply(self) -> None:
        self.squadrons_panel.apply()

    def revert(self) -> None:
        self.type_list.revert()
        self.squadrons_panel.revert()
        self.update()


class AirWingConfigurationDialog(QDialog):
    """Dialog window for air wing configuration."""

    def __init__(self, game: Game, aircraft_present: bool, parent) -> None:
        super().__init__(parent)
        self.setMinimumSize(1024, 768)
        self.setWindowTitle(f"Air Wing Configuration")
        # TODO: self.setWindowIcon()

        layout = QVBoxLayout()
        self.setLayout(layout)

        doc_label = QLabel(
            "Use this opportunity to customize the squadrons available to your "
            "coalition. You can make changes at a later stage if "
            'the "Enable Air Wing adjustments" cheat option is enabled.'
            "<br /><br />"
            "To accept your changes and continue, close this window."
        )

        layout.addWidget(doc_label)

        self.tab_widget = QTabWidget()
        layout.addWidget(self.tab_widget)

        self.tabs = []
        for coalition in game.coalitions:
            coalition_tab = AirWingConfigurationTab(coalition, game, aircraft_present)
            name = "Blue" if coalition.player else "Red"
            self.tab_widget.addTab(coalition_tab, name)
            self.tabs.append(coalition_tab)

        load_save_layout = QHBoxLayout()
        save_button = QPushButton("Save Config")
        save_button.setProperty("style", "btn-primary")
        save_button.clicked.connect(lambda state: self.save_config())
        load_button = QPushButton("Load Config")
        load_button.setProperty("style", "btn-primary")
        load_button.clicked.connect(lambda state: self.load_config())
        load_save_layout.addWidget(load_button)
        load_save_layout.addWidget(save_button)
        layout.addLayout(load_save_layout)

        buttons_layout = QHBoxLayout()
        apply_button = QPushButton("Accept Changes")
        apply_button.setProperty("style", "btn-accept")
        apply_button.clicked.connect(lambda state: self.accept())
        discard_button = QPushButton("Reset Changes")
        discard_button.setProperty("style", "btn-danger")
        discard_button.clicked.connect(lambda state: self.revert())
        buttons_layout.addWidget(discard_button)
        buttons_layout.addWidget(apply_button)
        layout.addLayout(buttons_layout)

    def save_config(self) -> None:
        result = QMessageBox.information(
            None,
            "Save Air Wing?",
            "Revert will not be possible after saving a different Air Wing.<br />"
            "Are you sure you want to continue?",
            QMessageBox.StandardButton.Yes,
            QMessageBox.StandardButton.No,
        )
        if result == QMessageBox.StandardButton.No:
            return

        awd = airwing_dir()
        fd = QFileDialog(
            caption="Save Air Wing", directory=str(awd), filter="*.yaml;*.yml"
        )
        fd.setAcceptMode(QFileDialog.AcceptMode.AcceptSave)
        if fd.exec_():
            for tab in self.tabs:
                tab.apply()
            airwing = self._build_air_wing()
            filename = fd.selectedFiles()[0]
            with open(filename, "w") as f:
                f.write(yaml.dump(airwing))

    def _build_air_wing(self) -> dict:
        w = self.tab_widget.currentWidget()
        assert isinstance(w, AirWingConfigurationTab)
        squadrons = {}
        for ac, sqs in w.coalition.air_wing.squadrons.items():
            for s in sqs:
                cp = s.location.at
                if isinstance(cp, Point):
                    key = s.location.full_name
                else:
                    key = cp.id
                name = (
                    s.name
                    if s.name
                    in [x.name for x in w.coalition.air_wing.squadron_defs[ac]]
                    else s.aircraft.variant_id
                )
                entry = {
                    "primary": s.primary_task.value,
                    "secondary": [
                        sec.value
                        for sec in s.auto_assignable_mission_types
                        if sec.value != s.primary_task.value
                    ],
                    "aircraft": [name],
                    "size": s.max_size,
                }
                if squadrons.get(key):
                    squadrons[key].append(entry)
                else:
                    squadrons[key] = [entry]
        return squadrons

    def load_config(self) -> None:
        result = QMessageBox.information(
            None,
            "Load Air Wing?",
            "Revert will not be possible after loading a different Air Wing.<br />"
            "Are you sure you want to continue?",
            QMessageBox.StandardButton.Yes,
            QMessageBox.StandardButton.No,
        )
        if result == QMessageBox.StandardButton.No:
            return

        awd = airwing_dir()
        fd = QFileDialog(
            caption="Load Air Wing", directory=str(awd), filter="*.yaml;*.yml"
        )
        if fd.exec_():
            filename = fd.selectedFiles()[0]
            with open(filename, "r") as f:
                airwing = yaml.safe_load(f)
                self._construct_air_wing_tab(airwing)

    def _construct_air_wing_tab(self, airwing: dict[str, Any]) -> None:
        w = self.tab_widget.currentWidget()
        assert isinstance(w, AirWingConfigurationTab)
        c = w.coalition
        c.air_wing.squadrons = defaultdict(list)
        config = CampaignAirWingConfig.from_campaign_data(airwing, c.game.theater)
        c.configure_default_air_wing(config)
        w.revert()
        if c.game.turn != 0:
            c.initialize_turn(False)

    def revert(self) -> None:
        for tab in self.tabs:
            tab.revert()

    def accept(self) -> None:
        for tab in self.tabs:
            tab.apply()
            if tab.coalition.game.turn != 0:
                tab.coalition.initialize_turn(False)
        super().accept()

    def reject(self) -> None:
        result = QMessageBox.information(
            None,
            "Discard changes?",
            "Are you sure you want to discard your changes?",
            QMessageBox.StandardButton.Yes,
            QMessageBox.StandardButton.No,
        )
        if result == QMessageBox.StandardButton.No:
            return
        super().reject()


class SquadronAircraftTypeSelector(QComboBox):
    def __init__(
        self, types: set[AircraftType], selected_aircraft: Optional[str]
    ) -> None:
        super().__init__()
        self.setSizeAdjustPolicy(QComboBox.SizeAdjustPolicy.AdjustToContents)

        for type in sorted(types, key=lambda type: type.display_name):
            self.addItem(type.display_name, type)

        if selected_aircraft:
            self.setCurrentText(selected_aircraft)


class SquadronDefSelector(QComboBox):
    def __init__(
        self,
        squadron_defs: dict[AircraftType, list[SquadronDef]],
        aircraft: Optional[AircraftType],
        allow_random: bool = True,
    ) -> None:
        super().__init__()
        self.setSizeAdjustPolicy(QComboBox.SizeAdjustPolicy.AdjustToContents)
        self.squadron_defs = squadron_defs
        self.allow_random = allow_random
        self.set_aircraft_type(aircraft)

    def set_aircraft_type(self, aircraft: Optional[AircraftType]):
        self.clear()
        if self.allow_random:
            self.addItem("None (Random)", None)
        if aircraft and aircraft in self.squadron_defs:
            for squadron_def in sorted(
                self.squadron_defs[aircraft], key=lambda squadron_def: squadron_def.name
            ):
                if not squadron_def.claimed:
                    squadron_name = squadron_def.name
                    if squadron_def.nickname:
                        squadron_name += " (" + squadron_def.nickname + ")"
                    self.addItem(squadron_name, squadron_def)
        self.setCurrentIndex(0)


class SquadronConfigPopup(QDialog):
    def __init__(
        self,
        selected_aircraft: Optional[str],
        types: set[AircraftType],
        bases: list[ControlPoint],
        squadron_defs: dict[AircraftType, list[SquadronDef]],
    ) -> None:
        super().__init__()

        self.setWindowTitle(f"Add new Squadron")

        self.column = QVBoxLayout()
        self.setLayout(self.column)

        self.column.addWidget(QLabel("Aircraft:"))
        self.aircraft_type_selector = SquadronAircraftTypeSelector(
            types, selected_aircraft
        )
        self.aircraft_type_selector.currentIndexChanged.connect(
            self.on_aircraft_selection
        )
        self.column.addWidget(self.aircraft_type_selector)

        self.column.addWidget(QLabel("Primary task:"))
        self.primary_task_selector = PrimaryTaskSelector(
            self.aircraft_type_selector.currentData()
        )
        self.column.addWidget(self.primary_task_selector)

        self.column.addWidget(QLabel("Base:"))
        self.squadron_base_selector = SquadronBaseSelector(
            bases, None, self.aircraft_type_selector.currentData()
        )
        self.column.addWidget(self.squadron_base_selector)

        self.column.addWidget(QLabel("Preset:"))
        self.squadron_def_selector = SquadronDefSelector(
            squadron_defs, self.aircraft_type_selector.currentData()
        )
        self.column.addWidget(self.squadron_def_selector)

        self.column.addStretch()

        self.button_layout = QHBoxLayout()
        self.column.addLayout(self.button_layout)

        self.accept_button = QPushButton("Accept")
        self.accept_button.clicked.connect(lambda state: self.accept())
        self.update_accept_button()
        self.button_layout.addWidget(self.accept_button)

        self.cancel_button = QPushButton("Cancel")
        self.cancel_button.clicked.connect(lambda state: self.reject())
        self.button_layout.addWidget(self.cancel_button)

    def update_accept_button(self) -> None:
        enabled = (
            self.aircraft_type_selector.currentData() is not None
            and self.squadron_base_selector.currentData() is not None
            and self.primary_task_selector.selected_task is not None
        )
        self.accept_button.setEnabled(enabled)

    def on_aircraft_selection(self) -> None:
        self.squadron_base_selector.set_aircraft_type(
            self.aircraft_type_selector.currentData()
        )
        self.squadron_def_selector.set_aircraft_type(
            self.aircraft_type_selector.currentData()
        )
        self.primary_task_selector.set_aircraft(
            self.aircraft_type_selector.currentData()
        )
        self.update_accept_button()
        self.update()


class PresetSquadronSelector(QDialog):
    def __init__(
        self,
        aircraft: AircraftType,
        squadron_defs: dict[AircraftType, list[SquadronDef]],
    ) -> None:
        super().__init__()

        self.setWindowTitle(f"Choose preset squadron")

        self.column = QVBoxLayout()
        self.setLayout(self.column)

        self.column.addWidget(QLabel("Preset:"))
        self.squadron_def_selector = SquadronDefSelector(
            squadron_defs, aircraft, allow_random=False
        )
        self.column.addWidget(self.squadron_def_selector)

        self.column.addStretch()

        self.button_layout = QHBoxLayout()
        self.column.addLayout(self.button_layout)

        self.accept_button = QPushButton("Accept")
        self.accept_button.clicked.connect(lambda state: self.accept())
        self.button_layout.addWidget(self.accept_button)

        self.cancel_button = QPushButton("Cancel")
        self.cancel_button.clicked.connect(lambda state: self.reject())
        self.button_layout.addWidget(self.cancel_button)