"""
Classes and functions related to AP locations for Pokemon Emerald
"""
from typing import TYPE_CHECKING, Dict, List, Optional, FrozenSet, Iterable

from BaseClasses import Location, Region

from .data import BASE_OFFSET, data
from .items import offset_item_value

if TYPE_CHECKING:
    from . import PokemonEmeraldWorld


class PokemonEmeraldLocation(Location):
    game: str = "Pokemon Emerald"
    rom_address: Optional[int]
    default_item_code: Optional[int]
    tags: FrozenSet[str]

    def __init__(
            self,
            player: int,
            name: str,
            flag: Optional[int],
            parent: Optional[Region] = None,
            rom_address: Optional[int] = None,
            default_item_value: Optional[int] = None,
            tags: FrozenSet[str] = frozenset()) -> None:
        super().__init__(player, name, None if flag is None else offset_flag(flag), parent)
        self.default_item_code = None if default_item_value is None else offset_item_value(default_item_value)
        self.rom_address = rom_address
        self.tags = tags


def offset_flag(flag: int) -> int:
    """
    Returns the AP location id (address) for a given flag
    """
    if flag is None:
        return None
    return flag + BASE_OFFSET


def reverse_offset_flag(location_id: int) -> int:
    """
    Returns the flag id for a given AP location id (address)
    """
    if location_id is None:
        return None
    return location_id - BASE_OFFSET


def create_locations_with_tags(world: "PokemonEmeraldWorld", regions: Dict[str, Region], tags: Iterable[str]) -> None:
    """
    Iterates through region data and adds locations to the multiworld if
    those locations include any of the provided tags.
    """
    tags = set(tags)

    for region_name, region_data in data.regions.items():
        region = regions[region_name]
        filtered_locations = [loc for loc in region_data.locations if len(tags & data.locations[loc].tags) > 0]

        for location_name in filtered_locations:
            location_data = data.locations[location_name]
            location = PokemonEmeraldLocation(
                world.player,
                location_data.label,
                location_data.flag,
                region,
                location_data.rom_address,
                location_data.default_item,
                location_data.tags
            )
            region.locations.append(location)


def create_location_label_to_id_map() -> Dict[str, int]:
    """
    Creates a map from location labels to their AP location id (address)
    """
    label_to_id_map: Dict[str, int] = {}
    for region_data in data.regions.values():
        for location_name in region_data.locations:
            location_data = data.locations[location_name]
            label_to_id_map[location_data.label] = offset_flag(location_data.flag)

    return label_to_id_map


LOCATION_GROUPS = {
    "Badges": {
        "Rustboro Gym - Stone Badge",
        "Dewford Gym - Knuckle Badge",
        "Mauville Gym - Dynamo Badge",
        "Lavaridge Gym - Heat Badge",
        "Petalburg Gym - Balance Badge",
        "Fortree Gym - Feather Badge",
        "Mossdeep Gym - Mind Badge",
        "Sootopolis Gym - Rain Badge",
    },
    "Gym TMs": {
        "Rustboro Gym - TM39 from Roxanne",
        "Dewford Gym - TM08 from Brawly",
        "Mauville Gym - TM34 from Wattson",
        "Lavaridge Gym - TM50 from Flannery",
        "Petalburg Gym - TM42 from Norman",
        "Fortree Gym - TM40 from Winona",
        "Mossdeep Gym - TM04 from Tate and Liza",
        "Sootopolis Gym - TM03 from Juan",
    },
    "Postgame Locations": {
        "Littleroot Town - S.S. Ticket from Norman",
        "SS Tidal - Hidden Item in Lower Deck Trash Can",
        "SS Tidal - TM49 from Thief",
        "Safari Zone NE - Item on Ledge",
        "Safari Zone NE - Hidden Item North",
        "Safari Zone NE - Hidden Item East",
        "Safari Zone SE - Item in Grass",
        "Safari Zone SE - Hidden Item in South Grass 1",
        "Safari Zone SE - Hidden Item in South Grass 2",
    }
}