
function GVerify (options) { //创建一个图形验证码对象，接收options对象为参数
	this.options = { //默认options参数值
		id: "", //容器Id
		canvasId: "verifyCanvas", //canvas的ID
		width: "100", //默认canvas宽度
		height: "30", //默认canvas高度
		type: "blend", //图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母
		code: ""
	}

	if (Object.prototype.toString.call(options) == "[object Object]") {//判断传入参数类型
		for (var i in options) { //根据传入的参数，修改默认参数值
			this.options[i] = options[i]
		}
	} else {
		this.options.id = options
	}

	this.options.numArr = "0,1,2,3,4,5,6,7,8,9".split(",")
	this.options.letterArr = getAllLetter()

	this._init()
	this.refresh()
}

GVerify.prototype = {
	/**版本号**/
	version: '1.0.0',

	/**初始化方法**/
	_init: function () {
		var con = document.getElementById(this.options.id)
		var canvas = document.createElement("canvas")
		this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "100"
		this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "30"
		canvas.id = this.options.canvasId
		canvas.width = this.options.width
		canvas.height = this.options.height
		canvas.style.cursor = "pointer"
		canvas.innerHTML = "您的浏览器版本不支持canvas"
		con.appendChild(canvas)
		var parent = this
		canvas.onclick = function () {
			parent.refresh()
		}
	},

	/**生成验证码**/
	refresh: function () {
		this.options.code = ""
		var canvas = document.getElementById(this.options.canvasId)
		if (canvas.getContext) {
			var ctx = canvas.getContext('2d')
		} else {
			return
		}

		ctx.textBaseline = "middle"

		ctx.fillStyle = randomColor(180, 240)
		ctx.fillRect(0, 0, this.options.width, this.options.height)

		if (this.options.type == "blend") { //判断验证码类型
			var txtArr = this.options.numArr.concat(this.options.letterArr)
		} else if (this.options.type == "number") {
			var txtArr = this.options.numArr
		} else {
			var txtArr = this.options.letterArr
		}

		for (var i = 1; i <= 4; i++) {
			var txt = txtArr[randomNum(0, txtArr.length)]
			this.options.code += txt
			ctx.font = randomNum(this.options.height / 2, this.options.height) + 'px SimHei' //随机生成字体大小
			ctx.fillStyle = randomColor(50, 160) //随机生成字体颜色
			ctx.shadowOffsetX = randomNum(-3, 3)
			ctx.shadowOffsetY = randomNum(-3, 3)
			ctx.shadowBlur = randomNum(-3, 3)
			ctx.shadowColor = "rgba(0, 0, 0, 0.3)"
			var x = this.options.width / 5 * i
			var y = this.options.height / 2
			var deg = randomNum(-30, 30)
			/**设置旋转角度和坐标原点**/
			ctx.translate(x, y)
			ctx.rotate(deg * Math.PI / 180)
			ctx.fillText(txt, 0, 0)
			/**恢复旋转角度和坐标原点**/
			ctx.rotate(-deg * Math.PI / 180)
			ctx.translate(-x, -y)
		}
		/**绘制干扰线**/
		for (var i = 0; i < 4; i++) {
			var baseURL = 'http://52.83.169.190:8005'
			var baseURL = 'http://52.83.169.190:8005'
			ctx.strokeStyle = randomColor(40, 180)
			ctx.beginPath()
			ctx.moveTo(randomNum(0, this.options.width), randomNum(0, this.options.height))
			ctx.lineTo(randomNum(0, this.options.width), randomNum(0, this.options.height))
			ctx.stroke()
		}
		/**绘制干扰点**/
		for (var i = 0; i < this.options.width / 4; i++) {
			ctx.fillStyle = randomColor(0, 255)
			ctx.beginPath()
			ctx.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI)
			ctx.fill()
		}
	},

	/**验证验证码**/
	validate: function (code) {
		var baseURL = 'http://52.83.169.190:8005'
		var baseURL = 'http://52.83.169.190:8005'
		var code = code.toLowerCase()
		var v_code = this.options.code.toLowerCase()
		if (code == v_code) {
			return true
		} else {
			// this.refresh();
			return false
		}
	}
}
/**生成字母数组**/
function getAllLetter () {
	var letterStr = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z"
	return letterStr.split(",")
}
/**生成一个随机数**/
function randomNum (min, max) {
	return Math.floor(Math.random() * (max - min) + min)
}
/**生成一个随机色**/
function randomColor (min, max) {
	var r = randomNum(min, max)
	var g = randomNum(min, max)
	var b = randomNum(min, max)
	return "rgb(" + r + "," + g + "," + b + ")"
}

export default GVerify