module.exports = {
	formatTime(date) {
		const year = date.getFullYear()
		const month = date.getMonth() + 1
		const day = date.getDate()
		const hour = date.getHours()
		const minute = date.getMinutes()
		const second = date.getSeconds()
		return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(
			':')
	},
	formatDate(date) {
		const year = date.getFullYear()
		const month = date.getMonth() + 1
		const day = date.getDate()


		return [year, month, day].map(formatNumber).join('-')
	},
	formatNumber(n) {
		n = n.toString()
		return n[1] ? n : '0' + n
	},

	compress(base64String, w, quality) {
		var getMimeType = (urlData) => {
			var arr = urlData.split(",");
			var mime = arr[0].match(/:(.*?);/)[1];
			// return mime.replace("image/", "");
			return mime;
		};
		var newImage = new Image();
		var imgWidth, imgHeight;

		var promise = new Promise((resolve) => (newImage.onload = resolve));
		newImage.src = base64String;
		return promise.then(() => {
			imgWidth = newImage.width;
			imgHeight = newImage.height;
			var canvas = document.createElement("canvas");
			var ctx = canvas.getContext("2d");
			if (Math.max(imgWidth, imgHeight) > w) {
				if (imgWidth > imgHeight) {
					canvas.width = w;
					canvas.height = (w * imgHeight) / imgWidth;
				} else {
					canvas.height = w;
					canvas.width = (w * imgWidth) / imgHeight;
				}
			} else {
				canvas.width = imgWidth;
				canvas.height = imgHeight;
			}
			ctx.clearRect(0, 0, canvas.width, canvas.height);
			ctx.drawImage(newImage, 0, 0, canvas.width, canvas.height);
			var base64 = canvas.toDataURL(getMimeType(base64String), quality);
			return base64;
		});

	}
}