import { SGraphItem } from "./SGraphItem";
import { SObject } from "@saga-web/base/lib";
import { SGraphLayoutType } from "./enums/SGraphLayoutType";

/**
 * 基本选择器
 *
 * @author  郝建龙
 */
export class SGraphSelectContainer extends SObject {
    /** 选择对象list    */
    private itemList: SGraphItem[] = [];
    /** 统计选中item的数量 */
    get count(): number {
        return this.itemList.length;
    }

    /**
     * 构造体
     * */
    constructor() {
        super();
    } // Constructor

    /**
     * 添加item到list
     *
     * @param   item    当前选中的item
     * */
    addItem(item: SGraphItem): void {
        for (let i = 0; i < this.itemList.length; i++) {
            if (this.itemList[i] == item) {
                return;
            }
        }
        item.selected = true;
        this.itemList.push(item);
        this.$emit("listChange", this.itemList);
    } // Function addItem()

    /**
     * 清空再添加(事件+复制数组)
     *
     * @param   item    当前选中的item
     * */
    setItem(item: SGraphItem): void {
        this.itemList.forEach((t: SGraphItem): void => {
            t.selected = false;
        });
        this.itemList.length = 0;
        item.selected = true;
        this.itemList.push(item);
        this.$emit("listChange", this.itemList);
    } // Function setItem()

    /**
     * 清空选择对象
     *
     * */
    clear(): void {
        this.itemList.forEach((t: SGraphItem): void => {
            t.selected = false;
        });
        this.itemList.length = 0;
        this.$emit("listChange", this.itemList);
    } // Function clear()

    /**
     * 切换选择对象
     *
     * @param   item    当前选中的item
     * */
    toggleItem(item: SGraphItem): void {
        for (let i = 0; i < this.itemList.length; i++) {
            if (this.itemList[i] == item) {
                this.itemList[i].selected = false;
                this.itemList.splice(i, 1);
                this.$emit("listChange", this.itemList);
                return;
            }
        }
        // 多选时,父级item需要一致
        if (this.itemList.length) {
            if (item.parent != this.itemList[0].parent) {
                return;
            }
        }
        item.selected = true;
        this.itemList.push(item);
        this.$emit("listChange", this.itemList);
    } // Function toggleItem()

    /**
     * 对齐
     *
     * @param   type    对齐方式
     * */
    layout(type: SGraphLayoutType): void {
        if (this.itemList.length < 2) {
            return;
        }
        switch (type) {
            case SGraphLayoutType.Left:
                this.alignLeft();
                break;
            case SGraphLayoutType.Bottom:
                this.alignBottom();
                break;
            case SGraphLayoutType.Center:
                this.alignCenter();
                break;
            case SGraphLayoutType.Horizontal:
                this.alignHorizontal();
                break;
            case SGraphLayoutType.Middle:
                this.alignMiddle();
                break;
            case SGraphLayoutType.Right:
                this.alignRight();
                break;
            case SGraphLayoutType.Top:
                this.alignTop();
                break;
            case SGraphLayoutType.Vertical:
                this.alignVertical();
                break;
            default:
                console.log("对齐类型不存在");
                break;
        }
    } // Function layout()

    /**
     * 左对齐
     *
     * */
    private alignLeft(): void {
        let standardItem = this.itemList[0];
        // 计算第一个外接矩阵左上角坐标在场景中的坐标
        let p = standardItem.mapToScene(
            standardItem.boundingRect().x,
            standardItem.boundingRect().y
        );
        for (let i = 1; i < this.itemList.length; i++) {
            let curItem = this.itemList[i];
            if (curItem.moveable) {
                // 将p转换为当前item中的坐标
                let p1 = curItem.mapFromScene(p.x, p.y);
                // 根据等式差值相等 newboundx - oldboundx = newposx - oldposx => newposx = newboundx - oldboundx + oldposx
                curItem.x = p1.x - curItem.boundingRect().x + curItem.x;
            }
        }
    } // Function alignLeft()

    /**
     * 顶对齐
     *
     * */
    private alignTop(): void {
        let standardItem = this.itemList[0];
        let p = standardItem.mapToScene(
            standardItem.boundingRect().x,
            standardItem.boundingRect().y
        );
        for (let i = 1; i < this.itemList.length; i++) {
            let curItem = this.itemList[i];
            if (curItem.moveable) {
                let p1 = curItem.mapFromScene(p.x, p.y);
                curItem.y = p1.y - curItem.boundingRect().y + curItem.y;
            }
        }
    } // Function alignTop()

    /**
     * 右对齐
     *
     * */
    private alignRight(): void {
        let standardItem = this.itemList[0];
        let p = standardItem.mapToScene(
            standardItem.boundingRect().right,
            standardItem.boundingRect().bottom
        );
        for (let i = 1; i < this.itemList.length; i++) {
            let curItem = this.itemList[i];
            if (curItem.moveable) {
                let p1 = curItem.mapFromScene(p.x, p.y);
                curItem.x = p1.x - curItem.boundingRect().right + curItem.x;
            }
        }
    } // Function alignRight()

    /**
     * 底对齐
     *
     * */
    private alignBottom(): void {
        let standardItem = this.itemList[0];
        let p = standardItem.mapToScene(
            standardItem.boundingRect().right,
            standardItem.boundingRect().bottom
        );
        for (let i = 1; i < this.itemList.length; i++) {
            let curItem = this.itemList[i];
            if (curItem.moveable) {
                let p1 = curItem.mapFromScene(p.x, p.y);
                curItem.y = p1.y - curItem.boundingRect().bottom + curItem.y;
            }
        }
    } // Function alignBottom()

    /**
     * 水平居中对齐
     *
     * */
    private alignCenter(): void {
        // 第一个选中的item即为基准对象
        let standardItem = this.itemList[0];
        // 基准对象的中心点
        let center = standardItem.boundingRect().center();
        // 中心点转换为场景坐标
        let p = standardItem.mapToScene(center.x, center.y);
        for (let i = 1; i < this.itemList.length; i++) {
            let curItem = this.itemList[i];
            if (curItem.moveable) {
                let p1 = curItem.mapFromScene(p.x, p.y);
                // 根据等式差值相等 newcenterx - oldcenterx = newposx - oldposx => newposx = newcenterx - oldcenterx + oldposx
                curItem.x =
                    p1.x - curItem.boundingRect().center().x + curItem.x;
            }
        }
    } // Function alignCenter()

    /**
     * 垂直居中对齐
     *
     * */
    private alignMiddle(): void {
        // 第一个选中的item即为基准对象
        let standardItem = this.itemList[0];
        // 基准对象的中心点
        let center = standardItem.boundingRect().center();
        // 中心点转换为场景坐标
        let p = standardItem.mapToScene(center.x, center.y);
        for (let i = 1; i < this.itemList.length; i++) {
            let curItem = this.itemList[i];
            if (curItem.moveable) {
                let p1 = curItem.mapFromScene(p.x, p.y);
                curItem.y =
                    p1.y - curItem.boundingRect().center().y + curItem.y;
            }
        }
    } // Function alignMiddle()

    /**
     * 垂直分布
     *
     * */
    private alignVertical(): void {
        if (this.itemList.length < 3) {
            return;
        }
        for (let i = 0; i < this.itemList.length - 1; i++) {
            for (let j = 0; j < this.itemList.length - 1 - i; j++) {
                let curItemCenter = this.itemList[j].boundingRect().center();
                let nextItemCenter = this.itemList[j + 1]
                    .boundingRect()
                    .center();
                let curCenterY = this.itemList[j].mapToScene(
                    curItemCenter.x,
                    curItemCenter.y
                ).y;
                let nextCenterY = this.itemList[j + 1].mapToScene(
                    nextItemCenter.x,
                    nextItemCenter.y
                ).y;
                if (curCenterY > nextCenterY) {
                    let temp = this.itemList[j];
                    this.itemList[j] = this.itemList[j + 1];
                    this.itemList[j + 1] = temp;
                }
            }
        }

        let top = this.itemList[0];
        let bottom = this.itemList[this.itemList.length - 1];

        let topCenter = top.boundingRect().center();
        let bottomCenter = bottom.boundingRect().center();

        let leftToRight =
            bottom.mapToScene(bottomCenter.x, bottomCenter.y).y -
            top.mapToScene(topCenter.x, topCenter.y).y;
        let average = leftToRight / (this.itemList.length - 1);

        for (let k = 1; k < this.itemList.length - 1; k++) {
            let curItem = this.itemList[k];
            if (curItem.moveable) {
                let p1 = top.mapToScene(
                    top.boundingRect().center().x,
                    top.boundingRect().center().y
                );
                let p2 = curItem.mapFromScene(p1.x, p1.y + average * k);
                curItem.y =
                    p2.y - curItem.boundingRect().center().y + curItem.y;
            }
        }
    } // Function alignVertical()

    /**
     * 水平分布
     *
     * */
    private alignHorizontal(): void {
        if (this.itemList.length < 3) {
            return;
        }
        for (let i = 0; i < this.itemList.length - 1; i++) {
            for (let j = 0; j < this.itemList.length - 1 - i; j++) {
                let curItemCenter = this.itemList[j].boundingRect().center();
                let nextItemCenter = this.itemList[j + 1]
                    .boundingRect()
                    .center();
                let curCenterX = this.itemList[j].mapToScene(
                    curItemCenter.x,
                    curItemCenter.y
                ).x;
                let nextCenterX = this.itemList[j + 1].mapToScene(
                    nextItemCenter.x,
                    nextItemCenter.y
                ).x;
                if (curCenterX > nextCenterX) {
                    let temp = this.itemList[j];
                    this.itemList[j] = this.itemList[j + 1];
                    this.itemList[j + 1] = temp;
                }
            }
        }

        let left = this.itemList[0];
        let right = this.itemList[this.itemList.length - 1];

        let leftCenter = left.boundingRect().center();
        let rightCenter = right.boundingRect().center();

        let leftToRight =
            right.mapToScene(rightCenter.x, rightCenter.y).x -
            left.mapToScene(leftCenter.x, leftCenter.y).x;
        let average = leftToRight / (this.itemList.length - 1);

        for (let k = 1; k < this.itemList.length - 1; k++) {
            let curItem = this.itemList[k];
            if (curItem.moveable) {
                let p1 = left.mapToScene(
                    left.boundingRect().center().x,
                    left.boundingRect().center().y
                );
                let p2 = curItem.mapFromScene(p1.x + average * k, p1.y);
                // 根据等式 newposx - oldposx = newcenterx - oldcenterx
                curItem.x =
                    p2.x - curItem.boundingRect().center().x + curItem.x;
            }
        }
    } // Function alignHorizontal()
} // Class SGraphSelectContainer