import { Engine } from '../engine';
import { LayoutProvider } from './layoutProvider';
import { LayoutGroupTable } from '../Model/modelConstructor';
import { Util } from '../Common/util';
import { SVModel } from '../Model/SVModel';
import { Renderer } from './renderer';
import { Reconcile } from './reconcile';
import { EventBus } from '../Common/eventBus';
import { Group } from '../Common/group';
import { Graph, Modes } from '@antv/g6-pc';
import { InitG6Behaviors } from '../BehaviorHelper/initG6Behaviors';
import { SVNode } from '../Model/SVNode';
import {
	SolveBrushSelectDrag,
	SolveDragCanvasWithLeak,
	SolveNodeAppendagesDrag,
	SolveZoomCanvasWithLeak,
} from '../BehaviorHelper/behaviorIssueHelper';

export class ViewContainer {
	private engine: Engine;
	private layoutProvider: LayoutProvider;
	private reconcile: Reconcile;
	public renderer: Renderer;

	private layoutGroupTable: LayoutGroupTable;
	private prevModelList: SVModel[];
	private accumulateLeakModels: SVModel[];

	public hasLeak: boolean;
	public leakAreaY: number;
	public brushSelectedModels: SVModel[]; // 保存框选过程中被选中的节点
	public clickSelectNode: SVNode; // 点击选中的节点

	constructor(engine: Engine, DOMContainer: HTMLElement) {
		const behaviorsModes: Modes = InitG6Behaviors(engine, this);

		this.engine = engine;
		this.layoutProvider = new LayoutProvider(engine, this);
		this.renderer = new Renderer(engine, DOMContainer, behaviorsModes);
		this.reconcile = new Reconcile(engine, this.renderer);
		this.layoutGroupTable = new Map();
		this.prevModelList = [];
		this.accumulateLeakModels = [];
		this.hasLeak = false; // 判断是否已经发生过泄漏
		this.brushSelectedModels = [];
		this.clickSelectNode = null;

		const g6Instance = this.renderer.getG6Instance(),
			leakAreaHeight = this.engine.viewOptions.leakAreaHeight,
			height = this.getG6Instance().getHeight(),
			{ drag, zoom } = this.engine.behaviorOptions;

		this.leakAreaY = height - leakAreaHeight;

		SolveNodeAppendagesDrag(this);
		SolveBrushSelectDrag(this);
		drag && SolveDragCanvasWithLeak(this);
		zoom && SolveZoomCanvasWithLeak(this);
	}

	// ----------------------------------------------------------------------------------------------

	/**
	 * 对主视图进行重新布局
	 */
	reLayout() {
		const g6Instance = this.getG6Instance(),
			group = g6Instance.getGroup(),
			matrix = group.getMatrix();

		if (matrix) {
			let dx = matrix[6],
				dy = matrix[7];

			g6Instance.translate(-dx, -dy);
		}

		this.layoutProvider.layoutAll(this.layoutGroupTable, this.accumulateLeakModels);
		g6Instance.refresh();
	}

	/**
	 * 获取 g6 实例
	 */
	getG6Instance(): Graph {
		return this.renderer.getG6Instance();
	}

	/**
	 * 获取泄漏区里面的元素
	 * @returns
	 */
	getAccumulateLeakModels(): SVModel[] {
		return this.accumulateLeakModels;
	}

	/**
	 *
	 */
	getLayoutGroupTable(): LayoutGroupTable {
		return this.layoutGroupTable;
	}

	/**
	 * 刷新视图
	 */
	refresh() {
		this.renderer.getG6Instance().refresh();
	}

	/**
	 * 重新调整容器尺寸
	 * @param width
	 * @param height
	 */
	resize(width: number, height: number) {
		const g6Instance = this.getG6Instance(),
			prevContainerHeight = g6Instance.getHeight(),
			globalGroup: Group = new Group();

		globalGroup.add(...this.prevModelList, ...this.accumulateLeakModels);
		this.renderer.changeSize(width, height);

		const containerHeight = g6Instance.getHeight(),
			dy = containerHeight - prevContainerHeight;

		globalGroup.translate(0, dy);
		this.renderer.refresh();

		this.leakAreaY += dy;
		EventBus.emit('onLeakAreaUpdate', {
			leakAreaY: this.leakAreaY,
			hasLeak: this.hasLeak,
		});
	}

	/**
	 * 渲染所有视图
	 * @param models
	 * @param layoutFn
	 */
	render(layoutGroupTable: LayoutGroupTable, isSameSources: boolean, isEnterFunction: boolean) {
		const modelList = Util.convertGroupTable2ModelList(layoutGroupTable);

        // 如果数据没变的话
		if (isSameSources) {
			modelList.forEach(item => item.restoreHighlight());
            return;
		}

		const diffResult = this.reconcile.diff(
				this.layoutGroupTable,
				this.prevModelList,
				modelList,
				this.accumulateLeakModels,
				isEnterFunction
			),
			renderModelList = [...modelList, ...diffResult.REMOVE, ...diffResult.LEAKED, ...diffResult.ACCUMULATE_LEAK];

		// 从有泄漏区变成无泄漏区
		if (this.hasLeak === true && this.accumulateLeakModels.length === 0) {
			this.hasLeak = false;
			EventBus.emit('onLeakAreaUpdate', {
				leakAreaY: this.leakAreaY,
				hasLeak: this.hasLeak,
			});
		}

		// 从无泄漏区变成有泄漏区
		if (diffResult.LEAKED.length) {
			this.hasLeak = true;
			EventBus.emit('onLeakAreaUpdate', {
				leakAreaY: this.leakAreaY,
				hasLeak: this.hasLeak,
			});
		}

		this.accumulateLeakModels.push(...diffResult.LEAKED); // 对泄漏节点进行向后累积
		this.renderer.build(renderModelList); // 首先在离屏canvas渲染先
		this.layoutProvider.layoutAll(layoutGroupTable, this.accumulateLeakModels); // 进行布局（设置model的x，y，样式等）

		this.beforeRender();
		this.renderer.render(renderModelList); // 渲染视图
		this.reconcile.patch(diffResult,isEnterFunction); // 对视图上的某些变化进行对应的动作，比如：节点创建动画，节点消失动画等
		this.afterRender();

		this.layoutGroupTable = layoutGroupTable;
		this.prevModelList = modelList;
	}

	/**
	 * 销毁
	 */
	destroy() {
		this.renderer.destroy();
		this.reconcile.destroy();
		this.layoutProvider = null;
		this.layoutGroupTable = null;
		this.prevModelList.length = 0;
		this.accumulateLeakModels.length = 0;
		this.brushSelectedModels.length = 0;
	}

	// ------------------------------------------------------------------------------

	/**
	 * 把渲染后要触发的逻辑放在这里
	 */
	private afterRender() {
		this.prevModelList.forEach(item => {
			if (item.leaked === false) {
				item.discarded = true;
			}
		});
	}

	/**
	 * 把渲染前要触发的逻辑放在这里
	 */
	private beforeRender() {}
}