from abc import abstractmethod
from typing import TypeVar, Generic

from game import Game
from game.coalition import Coalition
from game.dcs.groundunittype import GroundUnitType
from game.squadrons import Squadron
from game.theater import ControlPoint

ItemType = TypeVar("ItemType")


class TransactionError(RuntimeError):
    def __init__(self, message: str) -> None:
        super().__init__(message)


class PurchaseAdapter(Generic[ItemType]):
    def __init__(self, coalition: Coalition) -> None:
        self.coalition = coalition

    def buy(self, item: ItemType, quantity: int) -> None:
        for _ in range(quantity):
            if self.has_pending_sales(item):
                self.do_cancel_sale(item)
            elif self.can_buy(item):
                self.do_purchase(item)
            else:
                raise TransactionError(f"Cannot buy more {item}")
            self.coalition.adjust_budget(-self.price_of(item))

    def sell(self, item: ItemType, quantity: int) -> None:
        for _ in range(quantity):
            if self.has_pending_orders(item):
                self.do_cancel_purchase(item)
            elif self.can_sell(item):
                self.do_sale(item)
            else:
                raise TransactionError(f"Cannot sell more {item}")
            self.coalition.adjust_budget(self.price_of(item))

    def has_pending_orders(self, item: ItemType) -> bool:
        return self.pending_delivery_quantity(item) > 0

    def has_pending_sales(self, item: ItemType) -> bool:
        return self.pending_delivery_quantity(item) < 0

    @abstractmethod
    def current_quantity_of(self, item: ItemType) -> int:
        ...

    @abstractmethod
    def pending_delivery_quantity(self, item: ItemType) -> int:
        ...

    def expected_quantity_next_turn(self, item: ItemType) -> int:
        return self.current_quantity_of(item) + self.pending_delivery_quantity(item)

    def can_buy(self, item: ItemType) -> bool:
        return self.coalition.budget >= self.price_of(item)

    def can_sell_or_cancel(self, item: ItemType) -> bool:
        return self.can_sell(item) or self.has_pending_orders(item)

    @abstractmethod
    def can_sell(self, item: ItemType) -> bool:
        ...

    @abstractmethod
    def do_purchase(self, item: ItemType) -> None:
        ...

    @abstractmethod
    def do_cancel_purchase(self, item: ItemType) -> None:
        ...

    @abstractmethod
    def do_sale(self, item: ItemType) -> None:
        ...

    @abstractmethod
    def do_cancel_sale(self, item: ItemType) -> None:
        ...

    @abstractmethod
    def price_of(self, item: ItemType) -> int:
        ...

    @abstractmethod
    def name_of(self, item: ItemType, multiline: bool = False) -> str:
        ...


class AircraftPurchaseAdapter(PurchaseAdapter[Squadron]):
    def __init__(
        self, control_point: ControlPoint, coalition: Coalition, game: Game
    ) -> None:
        super().__init__(coalition)
        self.control_point = control_point
        self.game = game

    def pending_delivery_quantity(self, item: Squadron) -> int:
        return item.pending_deliveries

    def current_quantity_of(self, item: Squadron) -> int:
        return item.owned_aircraft

    def can_buy(self, item: Squadron) -> bool:
        return (
            super().can_buy(item)
            and self.control_point.unclaimed_parking(self.game) > 0
        )

    def can_sell(self, item: Squadron) -> bool:
        return item.untasked_aircraft > 0

    def do_purchase(self, item: Squadron) -> None:
        item.pending_deliveries += 1

    def do_cancel_purchase(self, item: Squadron) -> None:
        item.pending_deliveries -= 1

    def do_sale(self, item: Squadron) -> None:
        item.untasked_aircraft -= 1
        item.pending_deliveries -= 1

    def do_cancel_sale(self, item: Squadron) -> None:
        item.untasked_aircraft += 1
        item.pending_deliveries += 1

    def price_of(self, item: Squadron) -> int:
        return item.aircraft.price

    def name_of(self, item: Squadron, multiline: bool = False) -> str:
        if multiline:
            separator = "<br />"
        else:
            separator = " "
        return separator.join([item.aircraft.name, str(item)])


class GroundUnitPurchaseAdapter(PurchaseAdapter[GroundUnitType]):
    def __init__(
        self, control_point: ControlPoint, coalition: Coalition, game: Game
    ) -> None:
        super().__init__(coalition)
        self.control_point = control_point
        self.game = game

    def pending_delivery_quantity(self, item: GroundUnitType) -> int:
        return self.control_point.ground_unit_orders.pending_orders(item)

    def current_quantity_of(self, item: GroundUnitType) -> int:
        return self.control_point.base.total_units_of_type(item)

    def can_buy(self, item: GroundUnitType) -> bool:
        return super().can_buy(item) and self.control_point.has_ground_unit_source(
            self.game
        )

    def can_sell(self, item: GroundUnitType) -> bool:
        return False

    def do_purchase(self, item: GroundUnitType) -> None:
        self.control_point.ground_unit_orders.order({item: 1})

    def do_cancel_purchase(self, item: GroundUnitType) -> None:
        self.control_point.ground_unit_orders.sell({item: 1})

    def do_sale(self, item: GroundUnitType) -> None:
        raise TransactionError("Sale of ground units not allowed")

    def do_cancel_sale(self, item: GroundUnitType) -> None:
        raise TransactionError("Sale of ground units not allowed")

    def price_of(self, item: GroundUnitType) -> int:
        return item.price

    def name_of(self, item: GroundUnitType, multiline: bool = False) -> str:
        return f"{item}"