import Util from './Util.js'

/**
 * Dom工具类
 * 代码使用的leaflet开源工具
 * https://github.com/Leaflet/Leaflet/tree/master/src/core
 * @ignore
 */
class DomUtil {
	/**
	 * Returns an element given its DOM id, or returns the element itself
	 *  if it was passed directly.
	 * @ignore
	 * @param {*} id
	 */
	static get(id) {
		return typeof id === 'string' ? document.getElementById(id) : id
	}

	/**
	 * Returns the value for a certain style attribute on an element,
	 * including computed values or values set through CSS.
	 * @ignore
	 * @param {*} el
	 * @param {*} style
	 */
	static getStyle(el, style) {
		var value = el.style[style] || (el.currentStyle && el.currentStyle[style])

		if ((!value || value === 'auto') && document.defaultView) {
			var css = document.defaultView.getComputedStyle(el, null)
			value = css ? css[style] : null
		}
		return value === 'auto' ? null : value
	}

	/**
	 * Creates an HTML element with `tagName`, sets its class to `className`, and optionally appends it to `container` element.
	 * @ignore
	 * @param {*} tagName
	 * @param {*} className
	 * @param {*} container
	 */
	static create(tagName, className, container) {
		var el = document.createElement(tagName)
		el.className = className || ''
		if (container) {
			container.appendChild(el)
		}
		return el
	}

	/**
	 * Removes `el` from its parent element
	 * @ignore
	 * @param {*} el
	 */
	static remove(el) {
		var parent = el.parentNode
		if (parent) {
			parent.removeChild(el)
		}
	}

	/**
	 * Removes all of `el`'s children elements from `el`
	 * @ignore
	 * @param {*} el
	 */
	static empty(el) {
		while (el.firstChild) {
			el.removeChild(el.firstChild)
		}
	}

	/**
	 * Returns `true` if the element's class attribute contains `name`.
	 * @ignore
	 * @param {*} el
	 * @param {*} name
	 */
	hasClass(el, name) {
		if (el.classList !== undefined) {
			return el.classList.contains(name)
		}
		var className = getClass(el)
		return (
			className.length > 0 &&
			new RegExp('(^|\\s)' + name + '(\\s|$)').test(className)
		)
	}

	/**
	 * Adds `name` to the element's class attribute.
	 * @ignore
	 * @param {*} el
	 * @param {*} name
	 */
	static addClass(el, name) {
		if (el.classList !== undefined) {
			let classes = Util.splitWords(name)
			for (let i = 0, len = classes.length; i < len; i++) {
				el.classList.add(classes[i])
			}
		} else if (!this.hasClass(el, name)) {
			let className = this.getClass(el)
			this.setClass(el, (className ? className + ' ' : '') + name)
		}
	}

	/**
	 * Removes `name` from the element's class attribute.
	 * @ignore
	 * @param {*} el
	 * @param {*} name
	 */
	static removeClass(el, name) {
		if (el.classList !== undefined) {
			el.classList.remove(name)
		} else {
			this.setClass(
				el,
				Util.trim(
					(' ' + this.getClass(el) + ' ').replace(' ' + name + ' ', ' ')
				)
			)
		}
	}

	/**
	 *  Sets the element's class.
	 * @ignore
	 * @param {*} el
	 * @param {*} name
	 */
	static setClass(el, name) {
		if (el.className.baseVal === undefined) {
			el.className = name
		} else {
			// in case of SVG element
			el.className.baseVal = name
		}
	}

	/**
	 * Returns the element's class.
	 * @ignore
	 * @param {*} el
	 */
	static getClass(el) {
		// Check if the element is an SVGElementInstance and use the correspondingElement instead
		// (Required for linked SVG elements in IE11.)
		if (el.correspondingElement) {
			el = el.correspondingElement
		}
		return el.className.baseVal === undefined ?
			el.className :
			el.className.baseVal
	}

	/**
	 * @ignore
	 * @param {*} path
	 * @param {*} width
	 * @param {*} height
	 */
	static createSvg(width, height, path, container) {
		let svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg:svg')
		svg.setAttribute('class', 'svg-path')
		svg.setAttribute('width', width)
		svg.setAttribute('height', height)
		svg.setAttribute('viewBox', `0 0 ${width} ${height}`)
		let pathEl = document.createElementNS('http://www.w3.org/2000/svg', 'path')
		pathEl.setAttribute('d', path)
		svg.appendChild(pathEl)
		if (container) {
			container.appendChild(svg)
		}
		return svg
	}
}

export default DomUtil