import { handleUpdate, Sources } from "./sources";
import { LayoutGroupTable, ModelConstructor } from "./Model/modelConstructor";
import { AnimationOptions, BehaviorOptions, EngineOptions, LayoutGroupOptions, ViewOptions } from "./options";
import { EventBus } from "./Common/eventBus";
import { ViewContainer } from "./View/viewContainer";
import { SVNode } from "./Model/SVNode";
import { Util } from "./Common/util";
import { SVModel } from "./Model/SVModel";
import { G6Event } from "@antv/g6";


export class Engine {
    private modelConstructor: ModelConstructor;
    private viewContainer: ViewContainer;
    private prevStringSource: string;

    public engineOptions: EngineOptions;
    public viewOptions: ViewOptions;
    public animationOptions: AnimationOptions;
    public behaviorOptions: BehaviorOptions;

    constructor(DOMContainer: HTMLElement, engineOptions: EngineOptions) {
        this.engineOptions = Object.assign({}, engineOptions);

        this.viewOptions = Object.assign({
            fitCenter: true,
            fitView: false,
            groupPadding: 20,
            leakAreaHeight: 150,
            updateHighlight: '#fc5185'
        }, engineOptions.view);

        this.animationOptions = Object.assign({
            enable: true,
            duration: 750,
            timingFunction: 'easePolyOut'
        }, engineOptions.animation);

        this.behaviorOptions = Object.assign({
            drag: true,
            zoom: true,
            dragNode: true,
            selectNode: true
        }, engineOptions.behavior);

        this.modelConstructor = new ModelConstructor(this);
        this.viewContainer = new ViewContainer(this, DOMContainer);
    }

    /**
     * 输入数据进行渲染
     * @param sources
     * @param prevStep
     */
    public render(source: Sources) {
        let isSameSources: boolean = false,
            layoutGroupTable: LayoutGroupTable;

        if (source === undefined || source === null) {
            return;
        }

        let handleUpdate: handleUpdate = source.handleUpdate,
            stringSource = JSON.stringify(source);
            
        if (this.prevStringSource === stringSource) {
            isSameSources = true;
        }

        this.prevStringSource = stringSource;


        if(isSameSources) {
            // 若源数据两次一样的，用回上一次的layoutGroupTable
            layoutGroupTable = this.modelConstructor.getLayoutGroupTable();
        }
        else {  
            // 1 转换模型（data => model）
            layoutGroupTable = this.modelConstructor.construct(source);
        }

        // 2 渲染（使用g6进行渲染）
        this.viewContainer.render(layoutGroupTable, isSameSources, handleUpdate);
    }


    /**
     * 重新布局
     */
    public reLayout() {
        this.viewContainer.reLayout();
    }

    /**
     * 获取 G6 实例
     */
    public getGraphInstance() {
        return this.viewContainer.getG6Instance();
    }

    /**
     * 隐藏某些组
     * @param groupNames 
     */
    public hideGroups(groupNames: string | string[]) {
        const names = Array.isArray(groupNames) ? groupNames : [groupNames],
            instance = this.viewContainer.getG6Instance(),
            layoutGroupTable = this.modelConstructor.getLayoutGroupTable();

        layoutGroupTable.forEach(item => {
            const hasName = names.find(name => name === item.layout);

            if (hasName && !item.isHide) {
                item.modelList.forEach(model => instance.hideItem(model.G6Item));
                item.isHide = true;
            }

            if (!hasName && item.isHide) {
                item.modelList.forEach(model => instance.showItem(model.G6Item));
                item.isHide = false;
            }
        });
    }

    /**
     * 
     */
    public getAllModels(): SVModel[] {
        const modelList = Util.convertGroupTable2ModelList(this.modelConstructor.getLayoutGroupTable());
        const accumulateLeakModels = this.viewContainer.getAccumulateLeakModels();

        return [...modelList, ...accumulateLeakModels];
    }

    /**
     * 根据配置变化更新视图
     * @param modelType 
     * @returns 
     */
    public updateStyle(group: string, newOptions: LayoutGroupOptions) {
        const models = this.getAllModels(),
            layoutGroup = this.modelConstructor.getLayoutGroupTable().get(group);

        layoutGroup.options = newOptions;
        models.forEach(item => {
            if (item.group !== group) {
                return;
            }

            const modelType = item.getModelType(),
                optionsType = layoutGroup.options[modelType];

            if (optionsType) {
                if (modelType === 'addressLabel') {
                    item.updateG6ModelStyle(item.generateG6ModelProps(optionsType));
                }
                else {
                    const targetModelOption = optionsType[item.sourceType];
                    if (targetModelOption) {
                        item.updateG6ModelStyle(item.generateG6ModelProps(targetModelOption));
                    }
                }
            }
        });
    }

    /**
     * 使用id查找某个节点
     * @param id 
     */
    public findNode(id: string): SVNode {
        const modelList = this.getAllModels();
        const stringId = id.toString();
        const targetNode: SVNode = modelList.find(item => item instanceof SVNode && item.sourceId === stringId) as SVNode;

        return targetNode;
    }

    /**
     * 调整容器尺寸
     * @param width 
     * @param height 
     */
    public resize(width: number, height: number) {
        this.viewContainer.resize(width, height);
    }

    /**
     * 绑定 G6 事件
     * @param eventName 
     * @param callback 
     */
    public on(eventName: string, callback: Function) {
        if (typeof callback !== 'function') {
            return;
        }

        if (eventName === 'onFreed' || eventName === 'onLeak') {
            EventBus.on(eventName, callback);
            return;
        }

        if (eventName === 'onLeakAreaUpdate') {
            EventBus.on(eventName, callback);
            return;
        }

        this.viewContainer.getG6Instance().on(eventName as G6Event, event => {
            callback(event.item['SVModel']);
        });
    }

    /**
     * 开启/关闭框选模式
     * @param enable
     */
    public switchBrushSelect(enable: boolean) {
        const g6Instance = this.viewContainer.getG6Instance();
        enable ? g6Instance.setMode('brush') : g6Instance.setMode('default');
    }

    /**
     * 销毁引擎
     */
    public destroy() {
        this.modelConstructor.destroy();
        this.viewContainer.destroy();
    }
};