import { Intersection, Object3D, Raycaster, Vector3 } from "three";
import { begin, end } from "xaop";
import { app } from "../ApplicationServices/Application";
import { Sleep } from "../Common/Sleep";
import { FixedNotZero, GetEntity } from "../Common/Utils";
import { CommandHistoryRecord } from "../DatabaseServices/CommandHistoryRecord";
import { AlignedDimension } from "../DatabaseServices/Dimension/AlignedDimension";
import { Board } from "../DatabaseServices/Entity/Board";
import { equaln, rotatePoint } from "../Geometry/GeUtils";
import { RenderType } from "../GraphicsSystem/RenderType";
import { CommandState } from "./CommandState";
import { Raycast } from "./PointPick";

export class BoardMoveTool
{
    _DrawDimPoints: [Vector3, Vector3][];

    _DrawDims: AlignedDimension[] = [];

    _Board: Board;
    ForceUpdate = false;
    constructor()
    {
        let selectCtrl = app.Editor.SelectCtrl;
        end(selectCtrl, selectCtrl.UpdateSelectEvent, async () =>
        {
            if (!CommandState.CommandIng)
            {
                let set = selectCtrl.SelectSet;
                if (set.SelectObjectCount > 200) return;

                for (let i = set._SelectSetList.length; i--;)
                {
                    let s = set._SelectSetList[i];
                    let br: Board;
                    for (let o of s._SelectList)
                    {
                        let e = GetEntity(o);
                        if (e instanceof Board)
                            br = e;
                    }
                    if (br)
                    {
                        this._Board = br;
                        this.HitBoard(this._Board);
                        return;
                    }
                }
            }
        });

        begin(app.Viewer.PreViewer, app.Viewer.PreViewer.UpdateScreen, () =>
        {
            this.UpdateDimensionDraw();
        });

        end(selectCtrl, selectCtrl.CanenEvent, () =>
        {
            this.Clear();
        });

        //监听模块树的变更,当变更时,刷新视图
        end(app.Database.hm, app.Database.hm.RedoEvent, (cmdName: string, historyRec: CommandHistoryRecord) =>
        {
            this._Board && this.HitBoard(this._Board);
        });
        end(app.Database.hm, app.Database.hm.UndoEvent, (cmdName: string, historyRec: CommandHistoryRecord) =>
        {
            this._Board && this.HitBoard(this._Board);
        });
        app.CommandReactor.OnCommandEnd((cmdName, changeObjects, createObjects) =>
        {
            this._Board && this.HitBoard(this._Board);
        });
        end(app.Database, app.Database.FileRead, () =>
        {
            this.Clear();
        });
    }

    Clear()
    {
        this._Board = undefined;
        this._DrawDimPoints = undefined;
        this.ForceUpdate = false;
        this.UpdateDimensionDraw();
        app.Viewer.PreViewer.UpdateScreen();
    }

    private async HitBoard(br: Board)
    {
        await Sleep(1);
        let brOCS = br.OCS;
        let brRot = brOCS.clone().setPosition(0, 0, 0);
        let brOCSInv = br.OCSInv;
        let brNormal = br.Normal;
        let brNormal2 = brNormal.clone().negate();

        let brsObject: Object3D[] = [];
        let start = performance.now();
        let i = 0;
        for (let obj of app.Viewer.Scene.children)
        {
            if (obj.visible)
            {
                i++;
                if (i > 30)
                {
                    let now = performance.now();
                    let r = now - start;
                    if (now - start > 15)
                    {
                        await Sleep(1);
                        start = now;
                    }
                    else
                    {
                        i -= (16 - r) * 3;
                    }
                }
                let ent = GetEntity(obj);
                if (ent instanceof Board && ent !== br)
                {
                    brsObject.push(ent.GetDrawObjectFromRenderType(RenderType.Physical));
                }
            }
        }

        let dimPoints: [Vector3, Vector3][] = [];

        //首先计算四周的板件
        let sideBoards: Board[] = [];
        let pl = br.ContourCurve;
        let d = Math.sign(pl.Area2);
        for (let i = 0.5; i < pl.EndParam; i++)
        {
            let p = pl.GetPointAtParam(i);
            let derv = pl.GetFistDeriv(i).normalize();
            rotatePoint(derv, Math.PI * -0.5 * d);
            derv.applyMatrix4(brRot);
            p.setZ(br.Thickness * 0.5);
            p.applyMatrix4(brOCS);
            await Sleep(1);
            let intersection = this.RayPoint(p, derv, brsObject);

            if (intersection)
            {
                sideBoards.push(GetEntity(intersection.object) as Board);
                if (intersection.distance > 0.1)
                    dimPoints.push([p, intersection.point]);
            }
        }

        //计算最高和最低
        let maxZ = -Infinity;
        let minZ = Infinity;
        for (let sbr of sideBoards)
        {
            let sbrOCS = sbr.OCS;
            let mtx = sbrOCS.multiplyMatrices(brOCSInv, sbrOCS);
            for (let p of [new Vector3(), new Vector3(sbr.Width), new Vector3(sbr.Width, sbr.Height), new Vector3(0, sbr.Height)])
            {
                p.applyMatrix4(mtx);
                maxZ = Math.max(maxZ, p.z - br.Thickness);
                minZ = Math.min(minZ, p.z);
            }
        }

        //正面
        {
            let dist: number;
            let centerP: Vector3;
            for (let y of [0.5, 0.71, 0.21])
            {
                let p = new Vector3(br.Width * 0.5, br.Height * y, br.Thickness).applyMatrix4(brOCS);
                centerP = centerP ?? p;
                await Sleep(1);
                let intersection = this.RayPoint(p, brNormal, brsObject);
                if (intersection)
                {
                    if (dist !== undefined && equaln(dist, intersection.distance, 0.1))
                        continue;

                    dist = dist ?? intersection.distance;
                    if (intersection.distance > 0.01)
                    {
                        dimPoints.push([p, intersection.point]);
                    }
                }
            }

            if (dist === undefined && maxZ > 0)
            {
                let tp = centerP.clone().add(brNormal.clone().multiplyScalar(maxZ));
                dimPoints.push([centerP, tp]);
            }
        }

        //反面
        {
            let dist: number;
            let centerP: Vector3;
            for (let y of [0.5, 0.71, 0.21])
            {
                let p = new Vector3(br.Width * 0.5, br.Height * y, 0).applyMatrix4(brOCS);
                centerP = centerP ?? p;
                await Sleep(1);
                let intersection = this.RayPoint(p, brNormal2, brsObject);
                if (intersection)
                {
                    if (dist !== undefined && equaln(dist, intersection.distance, 0.1))
                        continue;

                    dist = dist ?? intersection.distance;
                    if (intersection.distance > 0.01)
                        dimPoints.push([p, intersection.point]);
                }
            }

            if (dist === undefined && minZ < 0)
            {
                let tp = centerP.clone().sub(brNormal2.clone().multiplyScalar(minZ));
                dimPoints.push([centerP, tp]);
            }
        }

        this._DrawDimPoints = dimPoints;

        this.UpdateDimensionDraw();
        app.Viewer.PreViewer.UpdateScreen();
    }

    private RayPoint(p: Vector3, n: Vector3, brs: Object3D[]): Intersection
    {
        let ray = new Raycaster(p, n);
        let intersection = Raycast(ray, brs);
        return intersection;
    }


    private UpdateDimensionDraw()
    {
        if ((!this._DrawDimPoints || CommandState.CommandIng) && !this.ForceUpdate)
        {
            for (let dim of this._DrawDims)
                dim.Visible = false;

            return;
        }

        for (let i = this._DrawDims.length; i < this._DrawDimPoints.length; i++)
        {
            let dim = new AlignedDimension();
            dim.Text.Height = 20;
            dim.LeadOutVisible = false;
            this._DrawDims.push(dim);
            app.Viewer.PreViewer.Scene.add(dim.DrawObject);
        }

        for (let i = this._DrawDimPoints.length; i < this._DrawDims.length; i++)
        {
            let dim = this._DrawDims[i];
            dim.Visible = false;
        }

        for (let i = 0; i < this._DrawDimPoints.length; i++)
        {
            let dim = this._DrawDims[i];
            dim.Visible = true;
            let pts = this._DrawDimPoints[i];

            let p1 = app.Viewer.PreViewer.WorldToViewPoint(pts[0].clone()).setZ(0);
            let p2 = app.Viewer.PreViewer.WorldToViewPoint(pts[1].clone()).setZ(0);
            dim.FootP1 = p1;
            dim.ArmP1 = p1;
            dim.FootP2 = p2;
            dim.ArmP2 = p2;
            dim.TextRotation = 0;
            dim.TextString = FixedNotZero(pts[0].distanceTo(pts[1]), 2);
        }
    }
}