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				// @flow

				import stringHash from 'string-hash';
				import tinycolor from 'tinycolor2';

				import { values } from '../utils/objects.js';

				function colorIsDark(color: string): boolean {
				return tinycolor(`#${color}`).isDark();
				}

				const selectedThreadColorsObj = Object.freeze({
				a: '4b87aa',
				b: '5c9f5f',
				c: 'b8753d',
				d: 'aa4b4b',
				e: '6d49ab',
				f: 'c85000',
				g: '008f83',
				h: '648caa',
				i: '57697f',
				j: '575757',
				});

				const selectedThreadColors: $ReadOnlyArray<string> = values(
				selectedThreadColorsObj,
				);
				export type SelectedThreadColors = $Values<typeof selectedThreadColorsObj>;

				function generateRandomColor(): string {
				return selectedThreadColors[
				Math.floor(Math.random() * selectedThreadColors.length)
				];
				}

				function generatePendingThreadColor(userIDs: $ReadOnlyArray<string>): string {
				const ids = [...userIDs].sort().join('#');
				const colorIdx = stringHash(ids) % selectedThreadColors.length;
				return selectedThreadColors[colorIdx];
				}

				export {
				colorIsDark,
				generateRandomColor,
				generatePendingThreadColor,
				selectedThreadColors,
				};