/* Copyright© 2000 - 2026 SuperMap Software Co.Ltd. All rights reserved.
 * This program are made available under the terms of the Apache License, Version 2.0
 * which accompanies this distribution and is available at http://www.apache.org/licenses/LICENSE-2.0.html.*/
import { scaleToResolution, getZoomByResolution } from '../util/MapCalculateUtil';

/**
 * @private
 * @class InitMapServiceBase
 * @category iServer Map
 * @classdesc 初始化地图信息服务类。
 * @example
 * var initMapServiceBase = new InitMapServiceBase(url, MapService);
 *
 * @param {string} url - 服务地址。如:http://localhost:8090/iserver/services/map-world/rest/maps/World+Map 。
 * @param {MapService} MapService - 地图信息服务类。
 * @param {Object} options - 参数。
 * @param {string} [options.proxy] - 服务代理地址。
 * @param {boolean} [options.withCredentials] - 请求是否携带凭据。默认情况下,仅同源请求包含凭据。
 * @param {boolean} [options.crossOrigin] - 是否允许跨域请求。
 * @param {Object} [options.headers] - 请求头。
 * @usage
 */
export class InitMapServiceBase {
 constructor(MapService, url, options) {
 this.MapService = MapService;
 this.url = url;
 this.options = options;

 this.CLASS_NAME = 'SuperMap.InitMapServiceBase';
 }

 /**
 * @function createMapService
 * @description 初始化地图服务。
 * @returns {MapService}
 */
 createMapService() {
 const MapService = this.MapService;
 const url = this.url;
 const options = this.options;
 return new MapService(url, {
 proxy: options.proxy,
 withCredentials: options.withCredentials,
 crossOrigin: options.crossOrigin,
 headers: options.headers,
 projection: options.projection
 });
 }

 /**
 * @function getMapInfo
 * @description 获取地图信息。
 * @returns {Promise}
 */
 getMapInfo(callback) {
 const mapService = this.createMapService();
 if(callback){
 return new Promise((resolve, reject) => {
 mapService.getMapInfo((res) => {
 callback(res, resolve, reject);
 });
 });
 }
 return mapService.getMapInfo();
 
 }

 getTilesets() {
 return this.createMapService().getTilesets();
 }

 /**
 * @function getWKT
 * @description 获取坐标投影的 WKT。
 * @returns {Promise}
 */
 getWKT() {
 return new Promise((resolve, reject) => {
 const mapService = this.createMapService();
 mapService.getWKT((res) => {
 try {
 const wkt = res.result.data;
 resolve(wkt);
 } catch (error) {
 reject(error);
 }
 });
 });
 }
}

/**
 * @function isPlaneProjection
 * @description 是否是平面坐标系。
 * @param {string} type - 投影坐标系类型。
 * @returns {boolean}
 */
export function isPlaneProjection(type) {
 return type === 'PCS_NON_EARTH';
}

/**
 * @function getEpsgCode
 * @description 获取 EPSG Code。
 * @param {Object} prjCoordSys
 * @returns {string}
 */
export function getEpsgCode(prjCoordSys) {
 const { type, epsgCode } = prjCoordSys;
 if (type == 'PCS_NON_EARTH') {
 // 平面投影
 return '';
 }
 return 'EPSG:' + epsgCode;
}

/**
 * @private
 * @function getTileFormat
 * @description 获取瓦片格式。
 * @returns {string} 瓦片格式
 */

export function getTileFormat(tileset) {
 if (tileset.tileFormat) {
 const format = tileset.tileFormat.toLowerCase();
 if (['jpg_png', 'default', 'png8'].includes(format)) {
 return 'png';
 }
 return format;
 }
 return 'png';
}

/**
 * @private
 * @function getTileset
 * @description 获取 tilseset
 * @returns {Object}
 */

export function getTileset(tilesets = [], targets) {
 const imageTilesets = Array.isArray(tilesets) && tilesets.filter((i) => {
 return i.metaData.tileType === targets.tileType || 'Image' && getEpsgCode(i.metaData.prjCoordSys) === getEpsgCode(targets.prjCoordSys);
 });
 return imageTilesets && imageTilesets[0] && imageTilesets[0].metaData;
}


/**
 * @private
 * @function extentToResolutions
 * @description mapboxgl maplibregl 获取地图resolutions。
 * @returns {Array} resolutions
 */
export function extentToResolutions(bounds, maxZoom = 22, tileSize = 512) {
 var resolutions = [];
 var left = bounds.left;
 var right = bounds.right;
 if (Array.isArray(bounds)) {
 left = bounds[0];
 right = bounds[2];
 }
 const maxReolution = Math.abs(left - right) / tileSize;
 for (let i = 0; i < maxZoom; i++) {
 resolutions.push(maxReolution / Math.pow(2, i));
 }
 return resolutions.sort(function (a, b) {
 return b - a;
 });
}

/**
 * @private
 * @function getZoom
 * @description mapboxgl maplibregl 获取地图zoom。
 * @param {Object} resetServiceInfo - rest 地图服务信息。
 * @param {string} resetServiceInfo.scale - scale
 * @param {Object} resetServiceInfo.dpi - dpi
 * @param {Object} resetServiceInfo.coordUnit- coordUnit。
 * @param {Object} extent - extent。
 * @returns {number} zoom
 */
export function getZoom({ scale, dpi, coordUnit }, extent) {
 const resolutions = extentToResolutions(extent);
 return getZoomByResolution(scaleToResolution(scale, dpi, coordUnit), resolutions);
}