import Charactor from "./Charactor.js";
import common from "./utils/common.js";
import data from "./utils/data.js";
import settings from "./utils/settings.js";

export default class CharactorManager {

    constructor(app) {

        this.app = app

        this.frameRate = settings.video.frameRate;

    }

    readPointData() {
        
        return fetch("../textures/outputmp4/points.json", {
            headers: {
                'content-type': 'application/json'
            },
            method: 'GET',
        })
        .then(response => response.json())
        .then(response => {
            this.pointsData = response
            this.pointsData.forEach(data => {
                data.position = BABYLON.Vector3.TransformCoordinates(
                    new BABYLON.Vector3(data.position.x, data.position.y, data.position.z),
                    BABYLON.Matrix.FromArray([
                        -0.01,   0,      0,      0,
                        0,      0,      0.01,  0,
                        0,      0.01,   0,      0,
                        0,      0,      0,      1
                    ])
                )
            })
        })
    }

    importCharactorModel(modelPath, modelName) {

        let self = this

        BABYLON.SceneLoader.ImportMesh("", modelPath, modelName, this.app.scene, function (newMeshes, particleSystems, skeletons, animationGroups) {
            
            self.charactor = new Charactor(newMeshes, particleSystems, skeletons, animationGroups)

            self.charactor.mesh.scaling.scaleInPlace(1.4);
            
            // 初始人物位置
            self.charactor.mesh.position = new BABYLON.Vector3(
                self.pointsData[0].position.x, 
                0,
                self.pointsData[0].position.z
            )
        });

    }

    clickHouse() {

        var scene = this.app.scene
        var pickinfo = scene.pick(scene.pointerX, scene.pointerY);

        if(pickinfo.pickedPoint) {

            // 在行走之前，首先要把人物矫正到45度的倍数（有视频的8个方向）

            if(this.app.camera.alpha % (Math.PI / 4) == 0 ) 
            {
                // 如果已经在8个方向上了
                this.charactorWalkTo(pickinfo.pickedPoint)
            } 
            else {
                // 相机方向矫正
                let cameraAlphaAmend = parseInt(this.app.camera.alpha / (Math.PI / 4)) * (Math.PI / 4)
                let pointData = this.getClosestPointData(this.charactor.mesh.position)
                let sendData = {
                    video: [pointData.id],
                    reverse: this.app.camera.alpha - cameraAlphaAmend < 0
                }
                // window.connection.socket.emit("getPush", sendData)

                // todo
                this.app.rotateCamera(this.app.camera.alpha - cameraAlphaAmend, () => {
                    this.charactorWalkTo(pickinfo.pickedPoint)
                })
            }
        }
    }

    onBeforeAnimation() {

        this.charactor.updateAniTrans()

    }

    charactorWalkTo(endPoint) {

        let currentPath = this.charactor.walkData.pathArr[this.charactor.walkData.currentPoint]
        let startPoint = (currentPath && currentPath.point) || this.charactor.mesh.position
        let sendData = {
            startId: this.getClosestPointData(startPoint).id,   // todo
            endId: this.getClosestPointData(endPoint).id,   // todo
            dir: this.getVideoDirecNum()
        }

        // window.connection.socket.emit("getPush", sendData)

        // todo
        let path = data.walkPath    // response
        path.forEach(data => data.point = this.pointsData[data.id].position)

        path = path.map((data) => { 
            return { 
                point: new BABYLON.Vector3(data.point.x, 0, data.point.z), 
                video: data.video && common.createVideoElement0(data.video)
            } 
        })

        // 行走时锁定camera
        this.app.lockCamera(true)
        this.charactor.startWalk(path, this)

    }

    getClosestPointData(vec) {
        let ueVec = {x: vec.x, y: vec.z, z: vec.y}
        let closestPoint = { data: null, length: 99999 }
        this.pointsData.forEach( data => {
            let length = common.getLengthBetweenVec3(ueVec, data.position)
            if(length < closestPoint.length) {
                closestPoint.data = data
                closestPoint.length = length
            }
        })
        return closestPoint.data
    }

    getVideoDirecNum() {
        // 视频逆时针旋转
        let num = Math.floor(this.app.camera.alpha % (Math.PI * 2) / (Math.PI / 4))

        if(num <= 0) {
            return -num
        } else {
            return 8 - num
        }
    }

}