import { isNil } from 'lodash-es';
import {
    IMapLayer,
    IMapLayerData,
    IMapLayerHookController,
    IMapLayerHooks
} from './types';
import { Hookable, HookController, logger } from '@motajs/common';

// todo: 提供 core.setBlock 等方法的替代方法，同时添加 setBlockList，以及前景背景的接口

export class MapLayer
    extends Hookable<IMapLayerHooks, IMapLayerHookController>
    implements IMapLayer
{
    width: number;
    height: number;
    empty: boolean = true;
    zIndex: number = 0;

    /** 地图图块数组 */
    private mapArray: Uint32Array;
    /** 地图数据引用 */
    private mapData: IMapLayerData;

    constructor(array: Uint32Array, width: number, height: number) {
        super();
        this.width = width;
        this.height = height;
        const area = width * height;
        this.mapArray = new Uint32Array(area);
        // 超出的裁剪，不足的补零
        this.mapArray.set(array);
        this.mapData = {
            expired: false,
            array: this.mapArray
        };
    }

    resize(width: number, height: number): void {
        if (this.width === width && this.height === height) {
            return;
        }
        this.mapData.expired = true;
        const before = this.mapArray;
        const beforeWidth = this.width;
        const beforeHeight = this.height;
        const beforeArea = beforeWidth * beforeHeight;
        this.width = width;
        this.height = height;
        const area = width * height;
        const newArray = new Uint32Array(area);
        this.mapArray = newArray;
        // 将原来的地图数组赋值给现在的
        if (beforeArea > area) {
            // 如果地图变小了，那么直接设置，不需要补零
            for (let ny = 0; ny < height; ny++) {
                const begin = ny * beforeWidth;
                newArray.set(before.subarray(begin, begin + width), ny * width);
            }
        } else {
            // 如果地图变大了，那么需要补零。因为新数组本来就是用 0 填充的，实际上只要赋值就可以了
            for (let ny = 0; ny < beforeHeight; ny++) {
                const begin = ny * beforeWidth;
                newArray.set(
                    before.subarray(begin, begin + beforeWidth),
                    ny * width
                );
            }
        }
        this.mapData = {
            expired: false,
            array: this.mapArray
        };
        this.forEachHook(hook => {
            hook.onResize?.(width, height);
        });
    }

    resize2(width: number, height: number): void {
        if (this.width === width && this.height === height) {
            this.mapArray.fill(0);
            return;
        }
        this.mapData.expired = true;
        this.width = width;
        this.height = height;
        this.mapArray = new Uint32Array(width * height);
        this.mapData = {
            expired: false,
            array: this.mapArray
        };
        this.empty = true;
        this.forEachHook(hook => {
            hook.onResize?.(width, height);
        });
    }

    setBlock(block: number, x: number, y: number): void {
        const index = y * this.width + x;
        if (block === this.mapArray[index]) return;
        this.mapArray[index] = block;
        this.forEachHook(hook => {
            hook.onUpdateBlock?.(block, x, y);
        });
        if (block !== 0) {
            this.empty = false;
        }
    }

    getBlock(x: number, y: number): number {
        if (x < 0 || y < 0 || x >= this.width || y >= this.height) {
            // 不在地图内，返回 -1
            return -1;
        }
        return this.mapArray[y * this.width + x];
    }

    putMapData(array: Uint32Array, x: number, y: number, width: number): void {
        if (array.length % width !== 0) {
            logger.warn(8);
        }
        const height = Math.ceil(array.length / width);
        if (width === this.width && height === this.height) {
            this.mapArray.set(array);
            this.forEachHook(hook => {
                hook.onUpdateArea?.(x, y, width, height);
            });
            return;
        }
        const w = this.width;
        const r = x + width;
        const b = y + height;
        if (x < 0 || y < 0 || r > w || b > this.height) {
            logger.warn(9);
        }
        const nl = Math.max(x, 0);
        const nt = Math.max(y, 0);
        const nr = Math.min(r, w);
        const nb = Math.min(b, this.height);
        const nw = nr - nl;
        const nh = nb - nt;
        let empty = true;
        for (let ny = 0; ny < nh; ny++) {
            const start = ny * nw;
            const offset = (ny + nt) * w + nl;
            const sub = array.subarray(start, start + nw);
            if (empty && sub.some(v => v !== 0)) {
                // 空地图判断
                empty = false;
            }
            this.mapArray.set(array.subarray(start, start + nw), offset);
        }
        this.forEachHook(hook => {
            hook.onUpdateArea?.(x, y, width, height);
        });
        this.empty &&= empty;
    }

    getMapData(): Uint32Array;
    getMapData(
        x: number,
        y: number,
        width: number,
        height: number
    ): Uint32Array;
    getMapData(
        x?: number,
        y?: number,
        width?: number,
        height?: number
    ): Uint32Array {
        if (isNil(x)) {
            return new Uint32Array(this.mapArray);
        }
        if (isNil(y) || isNil(width) || isNil(height)) {
            logger.warn(80);
            return new Uint32Array();
        }
        const w = this.width;
        const h = this.height;
        const r = x + width;
        const b = y + height;
        if (x < 0 || y < 0 || r > w || b > h) {
            logger.warn(81);
        }
        const res = new Uint32Array(width * height);
        const arr = this.mapArray;
        const nr = Math.min(r, w);
        const nb = Math.min(b, h);
        for (let nx = x; nx < nr; nx++) {
            for (let ny = y; ny < nb; ny++) {
                const origin = ny * w + nx;
                const target = (ny - y) * width + (nx - x);
                res[target] = arr[origin];
            }
        }
        return res;
    }

    /**
     * 获取地图数据的内部存储直接引用
     */
    getMapRef(): IMapLayerData {
        return this.mapData;
    }

    protected createController(
        hook: Partial<IMapLayerHooks>
    ): IMapLayerHookController {
        return new MapLayerHookController(this, hook);
    }

    setZIndex(zIndex: number): void {
        this.zIndex = zIndex;
    }

    async openDoor(x: number, y: number): Promise<void> {
        const index = y * this.width + x;
        const num = this.mapArray[index];
        if (num === 0) return;
        await Promise.all(
            this.forEachHook(hook => {
                return hook.onOpenDoor?.(x, y);
            })
        );
        this.setBlock(0, x, y);
    }

    async closeDoor(num: number, x: number, y: number): Promise<void> {
        const index = y * this.width + x;
        const nowNum = this.mapArray[index];
        if (nowNum !== 0) {
            logger.error(46, x.toString(), y.toString());
            return;
        }
        await Promise.all(
            this.forEachHook(hook => {
                return hook.onCloseDoor?.(num, x, y);
            })
        );
        this.setBlock(num, x, y);
    }
}

class MapLayerHookController
    extends HookController<IMapLayerHooks>
    implements IMapLayerHookController
{
    hookable: MapLayer;

    constructor(
        readonly layer: MapLayer,
        hook: Partial<IMapLayerHooks>
    ) {
        super(layer, hook);
        this.hookable = layer;
    }

    getMapData(): Readonly<IMapLayerData> {
        return this.layer.getMapRef();
    }
}