import { materials } from './manager';
import { IBlockIdentifier, IIndexedIdentifier } from './types';

function extractClsBlocks<C extends Exclude<Cls, 'tileset'>>(
    cls: C,
    map: Record<string, number>,
    icons: Record<string, number>
): IBlockIdentifier[] {
    const max = Math.max(...Object.values(icons));
    const arr = Array(max).fill(0);
    for (const [key, value] of Object.entries(icons)) {
        if (!(key in map)) continue;
        const id = key as AllIdsOf<C>;
        const num = map[id] as keyof NumberToId;
        const identifier: IBlockIdentifier = {
            id: id as string,
            cls,
            num
        };
        arr[value] = identifier;
    }
    return arr;
}

function addTileset(set: Set<number>, map?: readonly (readonly number[])[]) {
    if (!map) return;
    map.forEach(line => {
        line.forEach(v => {
            if (v >= 10000) set.add(v);
        });
    });
}

/**
 * 兼容旧版加载
 */
export function fallbackLoad() {
    // 基本素材
    const icons = core.icons.icons;
    const images = core.material.images;
    const idNumMap: Record<string, number> = {};

    for (const [key, value] of Object.entries(core.maps.blocksInfo)) {
        idNumMap[value.id] = Number(key);
    }

    const terrains = extractClsBlocks('terrains', idNumMap, icons.terrains);
    const animates = extractClsBlocks('animates', idNumMap, icons.animates);
    const items = extractClsBlocks('items', idNumMap, icons.items);
    const enemys = extractClsBlocks('enemys', idNumMap, icons.enemys);
    const npcs = extractClsBlocks('npcs', idNumMap, icons.npcs);
    const enemy48 = extractClsBlocks('enemy48', idNumMap, icons.enemy48);
    const npc48 = extractClsBlocks('npc48', idNumMap, icons.npc48);

    // Grid
    materials.addGrid(images.terrains, terrains);
    materials.addGrid(images.items, items);

    // Row Animates
    materials.addRowAnimate(images.animates, animates, 4, 32);
    materials.addRowAnimate(images.enemys, enemys, 2, 32);
    materials.addRowAnimate(images.npcs, npcs, 2, 32);
    materials.addRowAnimate(images.enemy48, enemy48, 4, 48);
    materials.addRowAnimate(images.npc48, npc48, 4, 48);

    // Autotile
    for (const key of Object.keys(icons.autotile)) {
        const id = key as AllIdsOf<'autotile'>;
        const img = images.autotile[id];
        const identifier: IBlockIdentifier = {
            id,
            num: idNumMap[id],
            cls: 'autotile'
        };
        materials.addAutotile(img, identifier);
    }

    // Tilesets
    core.tilesets.forEach((v, i) => {
        const img = images.tilesets[v];
        const identifier: IIndexedIdentifier = {
            index: i,
            alias: v
        };
        materials.addTileset(img, identifier);
    });

    // Images
    core.images.forEach((v, i) => {
        const img = core.material.images.images[v];
        materials.addImage(img, { index: i, alias: v });
    });

    materials.buildAssets();

    // 地图上出现过的 tileset
    const tilesetSet = new Set<number>();
    core.floorIds.forEach(v => {
        const floor = core.floors[v];
        addTileset(tilesetSet, floor.bgmap);
        addTileset(tilesetSet, floor.bg2map);
        addTileset(tilesetSet, floor.map);
        addTileset(tilesetSet, floor.fgmap);
        addTileset(tilesetSet, floor.fg2map);
    });

    materials.cacheTilesetList(tilesetSet);
}