"use strict";

const jdenticon = require("jdenticon");
const defaultValue = require("default-value");

module.exports = function generateJdenticon(name) {
	function setConfig() {
		/* NOTE: This is a hack to ensure that any other code using the `jdenticon` library can't mess with our config, since it's set globally. This function gets called prior to *every* jdenticon-generating operation. */
		jdenticon.config = {
			lightness: {
				color: [0.58, 0.66],
				grayscale: [0.30, 0.90]
			},
			saturation: {
				color: 0.66,
				grayscale: 0.00
			},
			backColor: "#00000000"
		};
	}

	return {
		toSvg: function (size) {
			setConfig();

			return jdenticon.toSvg(name, size);
		},
		primaryColor: function () {
			let svg = this.toSvg();

			let color = svg.match(/#([a-f0-9]{6})/g).find((candidate) => {
				let r = candidate.substr(1, 2);
				let g = candidate.substr(3, 2);
				let b = candidate.substr(5, 2);

				let isGrayScale = (r === g && g === b);

				return !isGrayScale;
			});
			
			return defaultValue(color, "#ff0000");
		},
		update: function (element) {
			setConfig();

			jdenticon.update(element, name);
		}
	}
};