/* eslint-disable no-prototype-builtins */
'use strict'
const init = (L) => {
    L.TileLayer.WMTS = L.TileLayer.extend({
        defaultWmtsParams: {
            service: 'WMTS',
            request: 'GetTile',
            version: '1.0.0',
            layer: '',
            style: '',
            tilematrixset: '',
            format: 'image/jpeg'
        },
    
        initialize: function (url, options) { // (String, Object)
            this._url = url;
            var lOptions= {};
            var cOptions = Object.keys(options);
            cOptions.forEach(element=>{
               lOptions[element.toLowerCase()]=options[element];
            });
            var wmtsParams = L.extend({}, this.defaultWmtsParams);
            var tileSize = lOptions.tileSize || this.options.tileSize;
            if (lOptions.detectRetina && L.Browser.retina) {
                wmtsParams.width = wmtsParams.height = tileSize * 2;
            } else {
                wmtsParams.width = wmtsParams.height = tileSize;
            }
            for (var i in lOptions) {
                // all keys that are in defaultWmtsParams options go to WMTS params
                if (wmtsParams.hasOwnProperty(i) && i!="matrixIds") {
                    wmtsParams[i] = lOptions[i];
                }
            }
            this.wmtsParams = wmtsParams;
            this.matrixIds = options.matrixIds||this.getDefaultMatrix();
            L.setOptions(this, options);
        },
    
        onAdd: function (map) {
            this._crs = this.options.crs || map.options.crs;
            L.TileLayer.prototype.onAdd.call(this, map);
        },
    
        getTileUrl: function (coords) { // (Point, Number) -> String
            var tileSize = this.options.tileSize;
            var nwPoint = coords.multiplyBy(tileSize);
            nwPoint.x+=1;
            nwPoint.y-=1;
            var sePoint = nwPoint.add(new L.Point(tileSize, tileSize));
            var zoom = this._tileZoom;
            var nw = this._crs.project(this._map.unproject(nwPoint, zoom));
            var se = this._crs.project(this._map.unproject(sePoint, zoom));
            var tilewidth = se.x-nw.x;
            var ident = this.matrixIds[zoom].identifier;
            var tilematrix = this.wmtsParams.tilematrixset + ":" + ident;
            var X0 = this.matrixIds[zoom].topLeftCorner.lng;
            var Y0 = this.matrixIds[zoom].topLeftCorner.lat;
            var tilecol=Math.floor((nw.x-X0)/tilewidth);
            var tilerow=-Math.floor((nw.y-Y0)/tilewidth);
            var url = L.Util.template(this._url, {s: this._getSubdomain(coords)});
            return url + L.Util.getParamString(this.wmtsParams, url) + "&tilematrix=" + tilematrix + "&tilerow=" + tilerow +"&tilecol=" + tilecol;
        },
    
        setParams: function (params, noRedraw) {
            L.extend(this.wmtsParams, params);
            if (!noRedraw) {
                this.redraw();
            }
            return this;
        },
        
        getDefaultMatrix : function () {
            /**
             * the matrix3857 represents the projection 
             * for in the IGN WMTS for the google coordinates.
             */
            var matrixIds3857 = new Array(22);
            for (var i= 0; i<22; i++) {
                matrixIds3857[i]= {
                    identifier    : "" + i,
                    topLeftCorner : new L.LatLng(20037508.3428,-20037508.3428)
                };
            }
            return matrixIds3857;
        }
    });
    
    L.tileLayer.wmts = function (url, options) {
        return new L.TileLayer.WMTS(url, options);
    };
}

export default {
    init
}