const CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('')

/**
 *  工具类
 *  代码使用的leaflet开源工具
 * https://github.com/Leaflet/Leaflet/tree/master/src/core
 * @ignore
 */
class Util {
	/**
	 * generate uuid
	 * @ignore
	 * @param {*} prefix
	 *
	 */
	static uuid(prefix = 'D') {
		let uuid = []
		uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-'
		uuid[14] = '4'
		let r
		for (let i = 0; i < 36; i++) {
			if (!uuid[i]) {
				r = 0 | (Math.random() * 16)
				uuid[i] = CHARS[i == 19 ? (r & 0x3) | 0x8 : r]
			}
		}
		return prefix + '-' + uuid.join('')
	}

	/**
	 *
	 * Merges the properties of the `src` object (or multiple objects) into `dest` object and returns the latter.
	 * @ignore
	 * @param {*} dest
	 * @param {*} sources
	 *
	 */
	static merge(dest, ...sources) {
		let i, j, len, src
		for (j = 0, len = sources.length; j < len; j++) {
			src = sources[j]
			for (i in src) {
				dest[i] = src[i]
			}
		}
		return dest
	}

	/**
	 *
	 * Compatibility polyfill for [String.prototype.trim](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String/Trim)
	 * @ignore
	 * @param {*} str
	 *
	 */
	static trim(str) {
		return str.trim ? str.trim() : str.replace(/^\s+|\s+$/g, '')
	}

	/**
	 * Trims and splits the string on whitespace and returns the array of parts.
	 * @ignore
	 * @param {*} str
	 *
	 */
	static splitWords(str) {
		return this.trim(str).split(/\s+/)
	}

	/**
	 *
	 * Merges the given properties to the `options` of the `obj` object, returning the resulting options. See `Class options`.
	 * @ignore
	 * @param {*} obj
	 * @param {*} options
	 *
	 */
	static setOptions(obj, options) {
		if (!obj.hasOwnProperty('options')) {
			obj.options = obj.options ? create(obj.options) : {}
		}
		for (var i in options) {
			obj.options[i] = options[i]
		}
		return obj.options
	}

	/**
	 * Check position for validity
	 * @ignore
	 * @param {*} position
	 */
	static checkPosition(position) {
		return (
			position &&
			position.hasOwnProperty('_lng') &&
			position.hasOwnProperty('_lat') &&
			position.hasOwnProperty('_alt')
		)
	}

	/**
	 * Check positions for validity
	 * @ignore
	 * @param {*} position
	 */
	static checkPositions(positions) {
		return (
			positions && (typeof positions === 'string' || Array.isArray(positions))
		)
	}

	/**
	 * Check viewer for validity
	 * @ignore
	 * @param {*} position
	 */
	static checkViewer(viewer) {
		return viewer && viewer.delegate && viewer.canvas
	}
}

export default Util