import * as THREE from "../../libs/three.js/build/three.module.js"; 
import  '../../libs/three.js/loaders/dxf/dxf-parser.js'  
 
 
 
 
 
 
 
 
 
export default class DxfLoader extends THREE.EventDispatcher{
 
    constructor(){
        super()
        
        this.parser = new Potree.DxfParser
    }
    
    
    load(url,done, options={}){
        Potree.loadFile(url, {returnText:true} , (data)=>{
             
            var dxfJson = this.parser.parseSync(data);
            
            console.log(dxfJson)
            let model = this.createModel(dxfJson, options)
            
            done(model)
        })
    }
    
    
    
    createModel(data, options={}){
        let root = new THREE.Object3D;

        
        var i, entity, obj, min_x, min_y, min_z, max_x, max_y, max_z;
       /*  var dims = {
            min: { x: false, y: false, z: false},
            max: { x: false, y: false, z: false}
        }; */
        
        //let bound = THREE.Box3
        
        for(i = 0; i < data.entities.length; i++) {
            entity = data.entities[i];
            obj = drawEntity(entity, data, options.unsupportTypes );
             
            if (obj) {  
                var bbox = new THREE.Box3().setFromObject(obj);
                /* if (bbox.min.x && ((dims.min.x === false) || (dims.min.x > bbox.min.x))) dims.min.x = bbox.min.x;
                if (bbox.min.y && ((dims.min.y === false) || (dims.min.y > bbox.min.y))) dims.min.y = bbox.min.y;
                if (bbox.min.z && ((dims.min.z === false) || (dims.min.z > bbox.min.z))) dims.min.z = bbox.min.z;
                if (bbox.max.x && ((dims.max.x === false) || (dims.max.x < bbox.max.x))) dims.max.x = bbox.max.x;
                if (bbox.max.y && ((dims.max.y === false) || (dims.max.y < bbox.max.y))) dims.max.y = bbox.max.y;
                if (bbox.max.z && ((dims.max.z === false) || (dims.max.z < bbox.max.z))) dims.max.z = bbox.max.z; */
                root.add(obj);
            }
            obj = null;
        }
        return root
     
    }
     
    
}

function drawEntity(entity, data, unsupportTypes, group) {
    var mesh;
    if(unsupportTypes && unsupportTypes.includes(entity.type)){
        console.warn('遇到一个dxf不会绘制的type：', entity.type)
        return  //add 不绘制该项
    } 
    if(entity.type === 'CIRCLE' || entity.type === 'ARC') {
        mesh = drawArc(entity, data, unsupportTypes, group );
    } else if(entity.type === 'LWPOLYLINE' || entity.type === 'LINE' || entity.type === 'POLYLINE') {
        mesh = drawLine(entity, data, unsupportTypes, group );
    } else if(entity.type === 'TEXT') {//"MTEXT"  text: "{\fKaiTi|b0|i0|c134|p49;糕点制作台}"
        mesh = drawText(entity, data, unsupportTypes, group);
    } else if(entity.type === 'SOLID') {
        mesh = drawSolid(entity, data);
    } else if(entity.type === 'POINT') {
        mesh = drawPoint(entity, data );
    } else if(entity.type === 'INSERT') {//嵌套其他group
        mesh = drawBlock(entity, data,  unsupportTypes, group );
    }  else if(entity.type === 'SPLINE') {
        mesh = drawSpline(entity, data);
    } else if(entity.type === 'MTEXT') {
        mesh = drawMtext(entity, data, unsupportTypes, group );
    } else if(entity.type === 'ELLIPSE') {
        mesh = drawEllipse(entity, data, unsupportTypes, group );
    } else if(entity.type === 'DIMENSION') {
        var dimTypeEnum = entity.dimensionType & 7;
        if(dimTypeEnum === 0) {
            mesh = drawDimension(entity, data);
        } else {
            console.log("Unsupported Dimension type: " + dimTypeEnum);
        }
    }
    else {
        console.log("Unsupported Entity Type: " + entity.type);
    }   
     
    if(entity.type === 'LWPOLYLINE' || entity.type === 'LINE' || entity.type === 'POLYLINE') {
        mesh = drawLine(entity, data);
    } 
    
    /* if(entity.type === 'INSERT') {
        mesh = drawBlock(entity, data);     //group
    }  */
    /* 
    
        门都是arc
        似乎墙壁都是不是insert类型，但窗户是
     */
    mesh && (mesh.dxfInfo = entity) //add
    return mesh;
}

function drawEllipse(entity, data) {
        var color = getColor(entity, data);

        var xrad = Math.sqrt(Math.pow(entity.majorAxisEndPoint.x,2) + Math.pow(entity.majorAxisEndPoint.y,2));
        var yrad = xrad*entity.axisRatio;
        var rotation = Math.atan2(entity.majorAxisEndPoint.y, entity.majorAxisEndPoint.x);

        var curve = new THREE.EllipseCurve(
            entity.center.x,  entity.center.y,
            xrad, yrad,
            entity.startAngle, entity.endAngle,
            false, // Always counterclockwise
            rotation
        );

        var points = curve.getPoints( 50 );
        var geometry = new THREE.BufferGeometry().setFromPoints( points );
        var material = new THREE.LineBasicMaterial( {  linewidth: 1, color : color } );

        // Create the final object to add to the scene
        var ellipse = new THREE.Line( geometry, material );
        return ellipse;
    }

    function drawMtext(entity, data) {
        var color = getColor(entity, data);

        //if (!font) { return console.log('font parameter not set. Ignoring text entity.')}

        var geometry = new THREE.TextGeometry( entity.text, {
            //font: font,
            size: entity.height * (4/5),
            height: 1
        });
        var material = new THREE.MeshBasicMaterial( {color: color} );
        var text = new THREE.Mesh( geometry, material );

        // Measure what we rendered.
        var measure = new THREE.Box3();
        measure.setFromObject( text );

        var textWidth  = measure.max.x - measure.min.x;

        // If the text ends up being wider than the box, it's supposed
        // to be multiline. Doing that in threeJS is overkill.
        if (textWidth > entity.width) {
            console.log("Can't render this multipline MTEXT entity, sorry.", entity);
            return undefined;
        }

        text.position.z = 0;
        switch (entity.attachmentPoint) {
            case 1:
                // Top Left
                text.position.x = entity.position.x;
                text.position.y = entity.position.y - entity.height;
            break;
            case 2:
                // Top Center
                text.position.x = entity.position.x - textWidth/2;
                text.position.y = entity.position.y - entity.height;
            break;
            case 3:
                // Top Right
                text.position.x = entity.position.x - textWidth;
                text.position.y = entity.position.y - entity.height;
            break;

            case 4:
                // Middle Left
                text.position.x = entity.position.x;
                text.position.y = entity.position.y - entity.height/2;
            break;
            case 5:
                // Middle Center
                text.position.x = entity.position.x - textWidth/2;
                text.position.y = entity.position.y - entity.height/2;
            break;
            case 6:
                // Middle Right
                text.position.x = entity.position.x - textWidth;
                text.position.y = entity.position.y - entity.height/2;
            break;

            case 7:
                // Bottom Left
                text.position.x = entity.position.x;
                text.position.y = entity.position.y;
            break;
            case 8:
                // Bottom Center
                text.position.x = entity.position.x - textWidth/2;
                text.position.y = entity.position.y;
            break;
            case 9:
                // Bottom Right
                text.position.x = entity.position.x - textWidth;
                text.position.y = entity.position.y;
            break;

            default:
                return undefined;
        };

        return text;
    }

    function drawSpline(entity, data) {
        var color = getColor(entity, data);

        var points = entity.controlPoints.map(function(vec) {
            return new THREE.Vector2(vec.x, vec.y);
        });

        var interpolatedPoints = [];
        var curve;
        if (entity.degreeOfSplineCurve === 2 || entity.degreeOfSplineCurve === 3) {
            for(var i = 0; i + 2 < points.length; i = i + 2) {
        if (entity.degreeOfSplineCurve === 2) {
                        curve = new THREE.QuadraticBezierCurve(points[i], points[i + 1], points[i + 2]);
        } else {
            curve = new THREE.QuadraticBezierCurve3(points[i], points[i + 1], points[i + 2]);
        }
                interpolatedPoints.push.apply(interpolatedPoints, curve.getPoints(50));
            }
        } else {
            curve = new THREE.SplineCurve(points);
            interpolatedPoints = curve.getPoints( 100 );
        }

        var geometry = new THREE.BufferGeometry().setFromPoints( interpolatedPoints );
        var material = new THREE.LineBasicMaterial( { linewidth: 1, color : color } );
        var splineObject = new THREE.Line( geometry, material );

        return splineObject;
    }

    function drawLine(entity, data) {
        var geometry = new THREE.Geometry(),
            color = getColor(entity, data),
            material, lineType, vertex, startPoint, endPoint, bulgeGeometry,
            bulge, i, line;

        if (!entity.vertices) return console.log('entity missing vertices.');

        // create geometry
        for(i = 0; i < entity.vertices.length; i++) {

            if(entity.vertices[i].bulge) { 
                bulge = entity.vertices[i].bulge;
                startPoint = entity.vertices[i];
                endPoint = i + 1 < entity.vertices.length ? entity.vertices[i + 1] : geometry.vertices[0];

                bulgeGeometry = new THREEx.BulgeGeometry(startPoint, endPoint, bulge);

                geometry.vertices.push.apply(geometry.vertices, bulgeGeometry.vertices);
            } else {
                vertex = entity.vertices[i];
                geometry.vertices.push(new THREE.Vector3(vertex.x, vertex.y, 0));
            }

        }
        if(entity.shape) geometry.vertices.push(geometry.vertices[0]);
         

        // set material
        if(entity.lineType) {
            lineType = data.tables.lineType.lineTypes[entity.lineType];
        }

        if(lineType && lineType.pattern && lineType.pattern.length !== 0) {
            material = new THREE.LineDashedMaterial({ color: color, gapSize: 4, dashSize: 4});
        } else {
            material = new THREE.LineBasicMaterial({ linewidth: 1, color: color });
        }

        // if(lineType && lineType.pattern && lineType.pattern.length !== 0) {

        //           geometry.computeLineDistances();

        //           // Ugly hack to add diffuse to this. Maybe copy the uniforms object so we
        //           // don't add diffuse to a material.
        //           lineType.material.uniforms.diffuse = { type: 'c', value: new THREE.Color(color) };

        // 	material = new THREE.ShaderMaterial({
        // 		uniforms: lineType.material.uniforms,
        // 		vertexShader: lineType.material.vertexShader,
        // 		fragmentShader: lineType.material.fragmentShader
        // 	});
        // }else {
        // 	material = new THREE.LineBasicMaterial({ linewidth: 1, color: color });
        // }

        line = new THREE.Line(geometry, material);
        return line;
    }
    
    function drawArc(entity, data) {
        var startAngle, endAngle;
        if (entity.type === 'CIRCLE') {
            startAngle = entity.startAngle || 0;
            endAngle = startAngle + 2 * Math.PI;
        } else {
            startAngle = entity.startAngle;
            endAngle = entity.endAngle;
        }

        var curve = new THREE.ArcCurve(
            0, 0,
            entity.radius,
            startAngle,
            endAngle);

        var points = curve.getPoints( 32 );
        var geometry = new THREE.BufferGeometry().setFromPoints( points );

        var material = new THREE.LineBasicMaterial({ color: getColor(entity, data) });

        var arc = new THREE.Line(geometry, material);
        arc.position.x = entity.center.x;
        arc.position.y = entity.center.y;
        arc.position.z = entity.center.z;

        return arc;
    }

    function drawSolid(entity, data) {
        var material, mesh, verts,
            geometry = new THREE.Geometry();

        verts = geometry.vertices;
        verts.push(new THREE.Vector3(entity.points[0].x, entity.points[0].y, entity.points[0].z));
        verts.push(new THREE.Vector3(entity.points[1].x, entity.points[1].y, entity.points[1].z));
        verts.push(new THREE.Vector3(entity.points[2].x, entity.points[2].y, entity.points[2].z));
        verts.push(new THREE.Vector3(entity.points[3].x, entity.points[3].y, entity.points[3].z));

        // Calculate which direction the points are facing (clockwise or counter-clockwise)
        var vector1 = new THREE.Vector3();
        var vector2 = new THREE.Vector3();
        vector1.subVectors(verts[1], verts[0]);
        vector2.subVectors(verts[2], verts[0]);
        vector1.cross(vector2);

        // If z < 0 then we must draw these in reverse order
        if(vector1.z < 0) {
            geometry.faces.push(new THREE.Face3(2, 1, 0));
            geometry.faces.push(new THREE.Face3(2, 3, 1));
        } else {
            geometry.faces.push(new THREE.Face3(0, 1, 2));
            geometry.faces.push(new THREE.Face3(1, 3, 2));
        }


        material = new THREE.MeshBasicMaterial({ color: getColor(entity, data) });

        return new THREE.Mesh(geometry, material);
        
    }

    function drawText(entity, data) {
        var geometry, material, text;
        //必须要font才能画出文字
        /* if(!font)
            return console.warn('Text is not supported without a Three.js font loaded with THREE.FontLoader! Load a font of your choice and pass this into the constructor. See the sample for this repository or Three.js examples at http://threejs.org/examples/?q=text#webgl_geometry_text for more details.');
         */
        geometry = new THREE.TextGeometry(entity.text, {/*  font: font, */ height: 0, size: entity.textHeight || 12 });

        if (entity.rotation) {
            var zRotation = entity.rotation * Math.PI / 180;
            geometry.rotateZ(zRotation);
        }

        material = new THREE.MeshBasicMaterial({ color: getColor(entity, data) });

        text = new THREE.Mesh(geometry, material);
        text.position.x = entity.startPoint.x;
        text.position.y = entity.startPoint.y;
        text.position.z = entity.startPoint.z;

        return text;
    }

    function drawPoint(entity, data) {
        var geometry, material, point;

        geometry = new THREE.Geometry();

        geometry.vertices.push(new THREE.Vector3(entity.position.x, entity.position.y, entity.position.z));

        // TODO: could be more efficient. PointCloud per layer?

        var numPoints = 1;

        var color = getColor(entity, data);
        var colors = new Float32Array( numPoints*3 );
        colors[0] = color.r;
        colors[1] = color.g;
        colors[2] = color.b;

        geometry.colors = colors;
        geometry.computeBoundingBox();

        material = new THREE.PointsMaterial( { size: 0.05, vertexColors: THREE.VertexColors } );
        point = new THREE.Points(geometry, material);
        //scene.add(point);
        return point
    }

    function drawDimension(entity, data, unsupportTypes, parentGroup) {
        
        return drawBlock(entity, data, unsupportTypes, parentGroup, true)
        //改
        
        /* var block = data.blocks[entity.block];

        if (!block || !block.entities) return null;

        var group = new THREE.Object3D();
        // if(entity.anchorPoint) {
        //     group.position.x = entity.anchorPoint.x;
        //     group.position.y = entity.anchorPoint.y;
        //     group.position.z = entity.anchorPoint.z;
        // }
        
        for(var i = 0; i < block.entities.length; i++) {
            var childEntity = drawEntity(block.entities[i], data, group);
            if(childEntity && !group.children.includes(childEntity)) group.add(childEntity);
        }

        return group; */
    }

    function drawBlock(entity, data, unsupportTypes, parentGroup, isDimension) {
        var block = data.blocks[entity.name];
        
        if (!block.entities) return null;

        var group = new THREE.Object3D()
        parentGroup && parentGroup.add(group)//提前添加  为了获得matrixWorld
        
        
        if(!isDimension){
            if(entity.position) {
                group.position.x = entity.position.x;
                group.position.y = entity.position.y;
                group.position.z = entity.position.z;
            }
            
            
            
            if(entity.xScale){ 
                group.scale.x = entity.xScale;  
            }
            if(entity.yScale){
                group.scale.y = entity.yScale; 
            }
            if(entity.rotation) {
                group.rotation.z = entity.rotation * Math.PI / 180;
            }
            
            //add:  经常看到有的会脱离主区域很远 add zScale
            var flag;
            if(entity.zScale != void 0 && entity.extrusionDirection){//see (005.dxf、 others/01.dxf)   extrusionDirection ={x:0,y:0,z:-1} 
                group.position.x *= Math.sign(entity.zScale)
                group.scale.x *= Math.sign(entity.zScale);
                group.rotation.z *= Math.sign(entity.zScale) 
                flag = 1;
                //检查下其他的extrusionDirection 
            }
            
        }else{
            /* if(entity.anchorPoint) {
                group.position.x = entity.anchorPoint.x;
                group.position.y = entity.anchorPoint.y;
                group.position.z = entity.anchorPoint.z;
            } */
        }    
          
         
        //add:
        
        group.updateMatrixWorld()
        
        var visiEntities = block.entities.filter(e=>e.visible !== false)
        //console.log("block的可见children个数"+block.entities.length)
         
        for(var i = 0; i < visiEntities.length; i++) {
            var childEntity = drawEntity(visiEntities[i], data, unsupportTypes, group  );
            if(childEntity && !group.children.includes(childEntity)) group.add(childEntity);
        }
        
        
        return group;
    }

    function getColor(entity, data) {
        var color = 0x000000; //default
        if(entity.color) color = entity.color;
        else if(data.tables && data.tables.layer && data.tables.layer.layers[entity.layer])
            color = data.tables.layer.layers[entity.layer].color;
            
        if(color == null || color === 0xffffff) {
            color = 0x000000;
        }
        return color;
    }

    function createLineTypeShaders(data) {
        var ltype, type;
        if(!data.tables || !data.tables.lineType) return;
        var ltypes = data.tables.lineType.lineTypes;

        for(type in ltypes) {
            ltype = ltypes[type];
            if(!ltype.pattern) continue;
            ltype.material = createDashedLineShader(ltype.pattern);
        }
    }

    function createDashedLineShader(pattern) {
        var i,
            dashedLineShader = {},
            totalLength = 0.0;

        for(i = 0; i < pattern.length; i++) {
            totalLength += Math.abs(pattern[i]);
        }

        dashedLineShader.uniforms = THREE.UniformsUtils.merge([

            THREE.UniformsLib[ 'common' ],
            THREE.UniformsLib[ 'fog' ],

            {
                'pattern': { type: 'fv1', value: pattern },
                'patternLength': { type: 'f', value: totalLength }
            }

        ]);

        dashedLineShader.vertexShader = [
            'attribute float lineDistance;',

            'varying float vLineDistance;',

            THREE.ShaderChunk[ 'color_pars_vertex' ],

            'void main() {',

            THREE.ShaderChunk[ 'color_vertex' ],

            'vLineDistance = lineDistance;',

            'gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',

            '}'
        ].join('\n');

        dashedLineShader.fragmentShader = [
            'uniform vec3 diffuse;',
            'uniform float opacity;',

            'uniform float pattern[' + pattern.length + '];',
            'uniform float patternLength;',

            'varying float vLineDistance;',

            THREE.ShaderChunk[ 'color_pars_fragment' ],
            THREE.ShaderChunk[ 'fog_pars_fragment' ],

            'void main() {',

            'float pos = mod(vLineDistance, patternLength);',

            'for ( int i = 0; i < ' + pattern.length + '; i++ ) {',
            'pos = pos - abs(pattern[i]);',
            'if( pos < 0.0 ) {',
            'if( pattern[i] > 0.0 ) {',
            'gl_FragColor = vec4(1.0, 0.0, 0.0, opacity );',
            'break;',
            '}',
            'discard;',
            '}',

            '}',

            THREE.ShaderChunk[ 'color_fragment' ],
            THREE.ShaderChunk[ 'fog_fragment' ],

            '}'
        ].join('\n');

        return dashedLineShader;
    }

    function findExtents(scene) { 
        for(var child of scene.children) {
            var minX, maxX, minY, maxY;
            if(child.position) {
                minX = Math.min(child.position.x, minX);
                minY = Math.min(child.position.y, minY);
                maxX = Math.max(child.position.x, maxX);
                maxY = Math.max(child.position.y, maxY);
            }
        }

        return { min: { x: minX, y: minY }, max: { x: maxX, y: maxY }};
    }

 

 
 

// Three.js extension functions. Webpack doesn't seem to like it if we modify the THREE object directly.
var THREEx = { Math: {} };
/**
 * Returns the angle in radians of the vector (p1,p2). In other words, imagine
 * putting the base of the vector at coordinates (0,0) and finding the angle
 * from vector (1,0) to (p1,p2).
 * @param  {Object} p1 start point of the vector
 * @param  {Object} p2 end point of the vector
 * @return {Number} the angle
 */
THREEx.Math.angle2 = function(p1, p2) {
	var v1 = new THREE.Vector2(p1.x, p1.y);
	var v2 = new THREE.Vector2(p2.x, p2.y);
	v2.sub(v1); // sets v2 to be our chord
	v2.normalize();
	if(v2.y < 0) return -Math.acos(v2.x);
	return Math.acos(v2.x);
};


THREEx.Math.polar = function(point, distance, angle) {
	var result = {};
	result.x = point.x + distance * Math.cos(angle);
	result.y = point.y + distance * Math.sin(angle);
	return result;
};

/**
 * Calculates points for a curve between two points
 * @param startPoint - the starting point of the curve
 * @param endPoint - the ending point of the curve
 * @param bulge - a value indicating how much to curve
 * @param segments - number of segments between the two given points
 */
THREEx.BulgeGeometry = function ( startPoint, endPoint, bulge, segments ) {

	var vertex, i,
		center, p0, p1, angle,
		radius, startAngle,
		thetaAngle;

	THREE.Geometry.call( this );

	this.startPoint = p0 = startPoint ? new THREE.Vector2(startPoint.x, startPoint.y) : new THREE.Vector2(0,0);
	this.endPoint = p1 = endPoint ? new THREE.Vector2(endPoint.x, endPoint.y) : new THREE.Vector2(1,0);
	this.bulge = bulge = bulge || 1;

	angle = 4 * Math.atan(bulge);
	radius = p0.distanceTo(p1) / 2 / Math.sin(angle/2);
	center = THREEx.Math.polar(startPoint, radius, THREEx.Math.angle2(p0,p1) + (Math.PI / 2 - angle/2));

	this.segments = segments = segments || Math.max( Math.abs(Math.ceil(angle/(Math.PI/18))), 6); // By default want a segment roughly every 10 degrees
	startAngle = THREEx.Math.angle2(center, p0);
	thetaAngle = angle / segments;


	this.vertices.push(new THREE.Vector3(p0.x, p0.y, 0));

	for(i = 1; i <= segments - 1; i++) {

		vertex = THREEx.Math.polar(center, Math.abs(radius), startAngle + thetaAngle * i);

		this.vertices.push(new THREE.Vector3(vertex.x, vertex.y, 0));

	}

};

THREEx.BulgeGeometry.prototype = Object.create( THREE.Geometry.prototype );
    



 

/* -----note--------------

 





 */