import { MapCellKind, PlaceRejectReason, TileSource, Weapon2TileType, type MapTileRecord } from '../types/MergeTypes';

/** 根据 Weapon2.type 判断能否落到该格（type1/2 只认可放置且尚无字块） */
export function canDropWeapon2OnCell(
    weapon2Type: Weapon2TileType,
    cellKind: MapCellKind,
    hasTile: boolean,
    canPutGrid = false,
): boolean {
    if (hasTile) return false;
    // 配表 type 可能是字符串，统一成数字再比
    switch (Number(weapon2Type)) {
        case Weapon2TileType.Single:
        case Weapon2TileType.Combo:
            return cellKind === MapCellKind.Put;
        case Weapon2TileType.Grid:
            return cellKind === MapCellKind.Walkable && canPutGrid;
        case Weapon2TileType.Shovel:
            return cellKind === MapCellKind.Dig;
        default:
            return false;
    }
}

/** type3 落子后：不可通行 + 可放置（由 MapGrid 自行刷新背景） */
export function cellKindAfterType3Place(): MapCellKind {
    return MapCellKind.Put;
}

/** type4 落子后的格语义 */
export function cellKindAfterType4Place(): MapCellKind {
    return MapCellKind.Put;
}

/** 拖回背包后 type1/2 原格恢复为空的可放置格 */
export function cellKindAfterReturnToBag(): MapCellKind {
    return MapCellKind.Put;
}

/** type3 拖起/撤销后恢复可行走 */
export function cellKindAfterType3Pickup(): MapCellKind {
    return MapCellKind.Walkable;
}

/** 备战阶段该字块是否可再拖 */
export function canDragMapTile(
    tile: MapTileRecord,
    weapon2Type: Weapon2TileType,
    isBuiltinPutWithoutTile: boolean,
): boolean {
    switch (Number(weapon2Type)) {
        case Weapon2TileType.Single:
        case Weapon2TileType.Combo:
            return true;
        case Weapon2TileType.Grid:
            return tile.source === TileSource.PrepPlaced && !isBuiltinPutWithoutTile;
        case Weapon2TileType.Shovel:
            return false;
        default:
            return false;
    }
}

/** type3 落子后可再拖动的时长（毫秒） */
export const PREP_TYPE3_MOVE_WINDOW_MS = 5000;

/** 备战 type3 扩展格（无字块节点）是否可拖起（落子后限时） */
export function canDragPrepType3Cell(
    isPrepType3: boolean,
    hasTile: boolean,
    placedAtMs: number | null = null,
    nowMs: number = Date.now(),
): boolean {
    if (!isPrepType3 || hasTile || placedAtMs == null) return false;
    return nowMs - placedAtMs < PREP_TYPE3_MOVE_WINDOW_MS;
}

export function rejectReasonToMessage(reason: PlaceRejectReason): string {
    switch (reason) {
        case PlaceRejectReason.PathBlocked:
            return '不能将路径堵死';
        case PlaceRejectReason.WrongCellKind:
            return '不能放在这里';
        case PlaceRejectReason.CellOccupied:
            return '格子已被占用';
        case PlaceRejectReason.NotDraggable:
            return '该格子不可移动';
        case PlaceRejectReason.InvalidMerge:
            return '无法升级';
        case PlaceRejectReason.MaxLevel:
            return '已达最高等级';
        case PlaceRejectReason.BagFull:
            return '背包已满';
        case PlaceRejectReason.SpiderWebBlocked:
            return '此处不能放置！';
        case PlaceRejectReason.WrongCampArea:
            return '只能放在己方区域';
        case PlaceRejectReason.UnlockDrag:
            return '';
        default:
            return '';
    }
}