var helpers = require('../ParseHelpers');
var VertexParser = require('./vertex');

module.exports = EntityParser;

function EntityParser() {}

EntityParser.ForEntityName = 'POLYLINE';

EntityParser.prototype.parseEntity = function(scanner, curr) {
    var entity = { type: curr.value, vertices: [] };
		curr = scanner.next();
		while(curr !== 'EOF') {
			if(curr.code === 0) break;

			switch(curr.code) {
				case 10: // always 0
				case 20: // always 0
				case 30: // elevation
				case 39: // thickness
                    entity.thickness = curr.value;
					break;
				case 40: // start width
				case 41: // end width
					break;
				case 70:
					entity.shape = (curr.value & 1) !== 0;
                    entity.includesCurveFitVertices = (curr.value & 2) !== 0;
                    entity.includesSplineFitVertices = (curr.value & 4) !== 0;
                    entity.is3dPolyline = (curr.value & 8) !== 0;
                    entity.is3dPolygonMesh = (curr.value & 16) !== 0;
                    entity.is3dPolygonMeshClosed = (curr.value & 32) !== 0; // 32 = The polygon mesh is closed in the N direction
                    entity.isPolyfaceMesh = (curr.value & 64) !== 0;
                    entity.hasContinuousLinetypePattern = (curr.value & 128) !== 0;
					break;
				case 71: // Polygon mesh M vertex count
				case 72: // Polygon mesh N vertex count
				case 73: // Smooth surface M density
				case 74: // Smooth surface N density
				case 75: // Curves and smooth surface type
					break;
				case 210:
                    extrusionDirection = helpers.parsePoint(scanner);
					break;
				default:
					helpers.checkCommonEntityProperties(entity, curr);
					break;
			}
			curr = scanner.next();
		}

		entity.vertices = parsePolylineVertices(scanner, curr);

		return entity;
};

function parsePolylineVertices(scanner, curr) {
    var vertexParser = new VertexParser();

    var vertices = [];
    while (!scanner.isEOF()) {
        if (curr.code === 0) {
            if (curr.value === 'VERTEX') {
                vertices.push(vertexParser.parseEntity(scanner, curr));
                curr = scanner.lastReadGroup;
            } else if (curr.value === 'SEQEND') {
                parseSeqEnd(scanner, curr);
                break;
            }
        }
    }
    return vertices;
};

function parseSeqEnd(scanner, curr) {
    var entity = { type: curr.value };
    curr = scanner.next();
    while(curr != 'EOF') {
        if (curr.code == 0) break;
        helpers.checkCommonEntityProperties(entity, curr);
        curr = scanner.next();
    }

    return entity;
};