const { RichEmbed } = require('discord.js');

const rgbToHSL = (red, green, blue) => {
	let r = red / 255;
	let g = green / 255;
	let b = blue / 255;

	let max = Math.max(r, g, b), min = Math.min(r, g, b);
	let h, s, l = (max + min) / 2;

	if (max == min) {
		h = s = 0;
	} else {
		let d = max - min;
		s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
		switch (max) {
		case r: h = (g - b) / d + (g < b ? 6 : 0); break;
		case g: h = (b - r) / d + 2; break;
		case b: h = (r - g) / d + 4; break;
		}
		h /= 6;
	}

	h = Math.round(h * 360);
	s = Math.round(s * 100);
	l = Math.round(l * 100);

	return { hue: h, saturation: s, lightness: l };
};

const resolveColor = input => {
	if (input.startsWith('#')) input = input.substr(1);
	if (input.length === 3) input = input.split('').map(c => c + c).join('');

	let hex = input;
	let [red, green, blue] = [hex.substr(0, 2), hex.substr(2, 2), hex.substr(4, 2)]
		.map(value => parseInt(value, 16));
	let { hue, saturation, lightness } = rgbToHSL(red, green, blue);

	return { hex, red, green, blue, hue, saturation, lightness };
};

exports.run = async (client, message, args, level) => {
  if (args.length < 1) {
		(await message.reply('please provide a color.')).delete(5000);
		return message.delete();
	}

	if (!/^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/.test(args[0])) {
		(await message.reply('the color must be in the format of `#RRGGBB` or `#RGB`.')).delete(5000);
		return message.delete();
	}

	let color = resolveColor(args[0]);

	message.delete();
	message.channel.send({
		embed: new RichEmbed()
			.setDescription(`Hex: \`#${color.hex}\`\nRGB: \`${color.red}, ${color.green}, ${color.blue}\`\nHSL: \`${color.hue}, ${color.saturation}, ${color.lightness}\``)
			.setImage(`http://placehold.it/500/${color.hex}/${color.hex}`)
			.setColor(`${color.hex}`)
	});
};

exports.conf = {
  enabled: true,
  guildOnly: false,
  aliases: ["hex","rgb"],
  permLevel: "User"
};

exports.help = {
  name: "color",
  category: "Information",
  description: "Shows some information and a preview of a specified hex color.",
  usage: "color <hex>"
};