From a42ea0961aeef51e8427abb19f6b2dec8f27fcef Mon Sep 17 00:00:00 2001
From: Alex Gleason <alex@alexgleason.me>
Date: Tue, 22 Mar 2022 12:37:57 -0500
Subject: [PATCH] Generate Tailwind colors from brandColor/accentColor

---
 app/soapbox/containers/soapbox.js             |   4 +-
 app/soapbox/features/ui/components/navbar.tsx |  12 +-
 app/soapbox/types/colors.ts                   |  10 ++
 app/soapbox/utils/__tests__/colors-test.js    |  22 ++++
 app/soapbox/utils/colors.ts                   | 123 ++++++++++++++++++
 app/soapbox/utils/theme.ts                    | 104 ++++++---------
 6 files changed, 203 insertions(+), 72 deletions(-)
 create mode 100644 app/soapbox/types/colors.ts
 create mode 100644 app/soapbox/utils/__tests__/colors-test.js
 create mode 100644 app/soapbox/utils/colors.ts

diff --git a/app/soapbox/containers/soapbox.js b/app/soapbox/containers/soapbox.js
index c702ea12c..aad96badb 100644
--- a/app/soapbox/containers/soapbox.js
+++ b/app/soapbox/containers/soapbox.js
@@ -25,7 +25,7 @@ import { createGlobals } from 'soapbox/globals';
 import messages from 'soapbox/locales/messages';
 import { makeGetAccount } from 'soapbox/selectors';
 import SoapboxPropTypes from 'soapbox/utils/soapbox_prop_types';
-import { colorsToCss } from 'soapbox/utils/theme';
+import { themeColorsToCSS } from 'soapbox/utils/theme';
 
 import { INTRODUCTION_VERSION } from '../actions/onboarding';
 import { preload } from '../actions/preload';
@@ -84,7 +84,7 @@ const mapStateToProps = (state) => {
     dyslexicFont: settings.get('dyslexicFont'),
     demetricator: settings.get('demetricator'),
     locale: validLocale(locale) ? locale : 'en',
-    themeCss: colorsToCss(soapboxConfig.get('colors').toJS()),
+    themeCss: themeColorsToCSS(soapboxConfig.get('brandColor') || '#0482d8', soapboxConfig.get('accentColor', '')),
     brandColor: soapboxConfig.get('brandColor'),
     themeMode: settings.get('themeMode'),
     singleUserMode,
diff --git a/app/soapbox/features/ui/components/navbar.tsx b/app/soapbox/features/ui/components/navbar.tsx
index 2f6ffe8df..d9198ecc4 100644
--- a/app/soapbox/features/ui/components/navbar.tsx
+++ b/app/soapbox/features/ui/components/navbar.tsx
@@ -33,11 +33,13 @@ const Navbar = () => {
     <nav className='bg-white shadow z-50 sticky top-0' ref={node}>
       <div className='max-w-7xl mx-auto px-2 sm:px-6 lg:px-8'>
         <div className='relative flex justify-between h-12 lg:h-16'>
-          <div className='absolute inset-y-0 left-0 flex items-center lg:hidden'>
-            <button onClick={onOpenSidebar}>
-              <Avatar src={account.avatar} size={34} />
-            </button>
-          </div>
+          {account && (
+            <div className='absolute inset-y-0 left-0 flex items-center lg:hidden'>
+              <button onClick={onOpenSidebar}>
+                <Avatar src={account.avatar} size={34} />
+              </button>
+            </div>
+          )}
 
           <div
             className={classNames({
diff --git a/app/soapbox/types/colors.ts b/app/soapbox/types/colors.ts
new file mode 100644
index 000000000..01f97eba0
--- /dev/null
+++ b/app/soapbox/types/colors.ts
@@ -0,0 +1,10 @@
+export type Rgb = { r: number, g: number, b: number };
+export type Hsl = { h: number, s: number, l: number };
+
+export type TailwindColorObject = {
+  [key: number]: string;
+};
+
+export type TailwindColorPalette = {
+  [key: string]: TailwindColorObject,
+}
diff --git a/app/soapbox/utils/__tests__/colors-test.js b/app/soapbox/utils/__tests__/colors-test.js
new file mode 100644
index 000000000..3e444620a
--- /dev/null
+++ b/app/soapbox/utils/__tests__/colors-test.js
@@ -0,0 +1,22 @@
+import tintify from '../colors';
+
+const AZURE = '#0482d8';
+
+describe('tintify()', () => {
+  it('generates tints from a base color', () => {
+    const result = tintify(AZURE);
+
+    expect(result).toEqual({
+      '100': '#e6f3fb',
+      '200': '#c0e0f5',
+      '300': '#9bcdef',
+      '400': '#4fa8e4',
+      '50': '#f2f9fd',
+      '500': '#0482d8',
+      '600': '#0475c2',
+      '700': '#0362a2',
+      '800': '#024e82',
+      '900': '#02406a',
+    });
+  });
+});
diff --git a/app/soapbox/utils/colors.ts b/app/soapbox/utils/colors.ts
new file mode 100644
index 000000000..c20c98830
--- /dev/null
+++ b/app/soapbox/utils/colors.ts
@@ -0,0 +1,123 @@
+/*
+MIT License
+
+Copyright (c) 2022 Javis V. Pérez
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+// Adapted from:
+// https://github.com/javisperez/tailwindcolorshades/blob/master/src/composables/colors.ts
+
+import type { Rgb, TailwindColorObject } from 'soapbox/types/colors';
+
+export function hexToRgb(hex: string): Rgb | null {
+  const sanitizedHex = hex.replace(/##/g, '#');
+  const colorParts = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(
+    sanitizedHex,
+  );
+
+  if (!colorParts) {
+    return null;
+  }
+
+  const [, r, g, b] = colorParts;
+
+  return {
+    r: parseInt(r, 16),
+    g: parseInt(g, 16),
+    b: parseInt(b, 16),
+  } as Rgb;
+}
+
+function rgbToHex(r: number, g: number, b: number): string {
+  const toHex = (c: number) => `0${c.toString(16)}`.slice(-2);
+  return `#${toHex(r)}${toHex(g)}${toHex(b)}`;
+}
+
+export function getTextColor(color: string): '#FFF' | '#333' {
+  const rgbColor = hexToRgb(color);
+
+  if (!rgbColor) {
+    return '#333';
+  }
+
+  const { r, g, b } = rgbColor;
+  const luma = 0.2126 * r + 0.7152 * g + 0.0722 * b;
+
+  return luma < 120 ? '#FFF' : '#333';
+}
+
+function lighten(hex: string, intensity: number): string {
+  const color = hexToRgb(`#${hex}`);
+
+  if (!color) {
+    return '';
+  }
+
+  const r = Math.round(color.r + (255 - color.r) * intensity);
+  const g = Math.round(color.g + (255 - color.g) * intensity);
+  const b = Math.round(color.b + (255 - color.b) * intensity);
+
+  return rgbToHex(r, g, b);
+}
+
+function darken(hex: string, intensity: number): string {
+  const color = hexToRgb(hex);
+
+  if (!color) {
+    return '';
+  }
+
+  const r = Math.round(color.r * intensity);
+  const g = Math.round(color.g * intensity);
+  const b = Math.round(color.b * intensity);
+
+  return rgbToHex(r, g, b);
+}
+
+export default function(baseColor: string): TailwindColorObject {
+  const response: TailwindColorObject = {
+    500: `#${baseColor}`.replace(/##/g, '#'),
+  };
+
+  const intensityMap: {
+    [key: number]: number;
+  } = {
+    50: 0.95,
+    100: 0.9,
+    200: 0.75,
+    300: 0.6,
+    400: 0.3,
+    600: 0.9,
+    700: 0.75,
+    800: 0.6,
+    900: 0.49,
+  };
+
+  [50, 100, 200, 300, 400].forEach(level => {
+    response[level] = lighten(baseColor, intensityMap[level]);
+  });
+
+  [600, 700, 800, 900].forEach(level => {
+    response[level] = darken(baseColor, intensityMap[level]);
+  });
+
+  return response;
+}
diff --git a/app/soapbox/utils/theme.ts b/app/soapbox/utils/theme.ts
index e052a41dc..3527199c2 100644
--- a/app/soapbox/utils/theme.ts
+++ b/app/soapbox/utils/theme.ts
@@ -1,37 +1,10 @@
-import { Map as ImmutableMap } from 'immutable';
+import tintify, { hexToRgb } from './colors';
 
-type RGB = { r: number, g: number, b: number };
-type HSL = { h: number, s: number, l: number };
-
-export const generateThemeCss = (brandColor: string, accentColor: string): string => {
-  if (!brandColor) return null;
-  return themeDataToCss(brandColorToThemeData(brandColor).merge(accentColorToThemeData(brandColor, accentColor)));
-};
-
-// https://stackoverflow.com/a/5624139
-function hexToRgb(hex: string): RGB {
-  // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
-  const shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
-  hex = hex.replace(shorthandRegex, (_m, r, g, b) => (
-    r + r + g + g + b + b
-  ));
-
-  const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
-  return result ? {
-    r: parseInt(result[1], 16),
-    g: parseInt(result[2], 16),
-    b: parseInt(result[3], 16),
-  } : {
-    // fall back to Azure
-    r: 4,
-    g: 130,
-    b: 216,
-  };
-}
+import type { Rgb, Hsl, TailwindColorPalette } from 'soapbox/types/colors';
 
 // Taken from chromatism.js
 // https://github.com/graypegg/chromatism/blob/master/src/conversions/rgb.js
-const rgbToHsl = (value: RGB): HSL => {
+const rgbToHsl = (value: Rgb): Hsl => {
   const r = value.r / 255;
   const g = value.g / 255;
   const b = value.b / 255;
@@ -68,6 +41,31 @@ const rgbToHsl = (value: RGB): HSL => {
   };
 };
 
+// https://stackoverflow.com/a/44134328
+function hslToHex(color: Hsl): string {
+  const { h, s } = color;
+  let { l } = color;
+
+  l /= 100;
+  const a = s * Math.min(l, 1 - l) / 100;
+
+  const f = (n: number) => {
+    const k = (n + h / 30) % 12;
+    const color = l - a * Math.max(Math.min(k - 3, 9 - k, 1), -1);
+    return Math.round(255 * color).toString(16).padStart(2, '0'); // convert to Hex and prefix "0" if needed
+  };
+
+  return `#${f(0)}${f(8)}${f(4)}`;
+}
+
+// Generate accent color from brand color
+const generateAccent = (brandColor: string): string => {
+  console.log(brandColor);
+  console.log(hexToRgb(brandColor));
+  const { h } = rgbToHsl(hexToRgb(brandColor));
+  return hslToHex({ h: h - 15, s: 86, l: 44 });
+};
+
 const parseShades = (obj: Record<string, any>, color: string, shades: Record<string, any>) => {
   if (typeof shades === 'string') {
     const { r, g, b } = hexToRgb(shades);
@@ -80,53 +78,29 @@ const parseShades = (obj: Record<string, any>, color: string, shades: Record<str
   });
 };
 
-const parseColors = (colors: Record<string, any>): Record<string, any> => {
+// Convert colors as CSS variables
+const parseColors = (colors: TailwindColorPalette): TailwindColorPalette => {
   return Object.keys(colors).reduce((obj, color) => {
     parseShades(obj, color, colors[color]);
     return obj;
   }, {});
 };
 
-export const colorsToCss = (colors: Record<string, any>): string => {
+export const colorsToCss = (colors: TailwindColorPalette): string => {
   const parsed = parseColors(colors);
   return Object.keys(parsed).reduce((css, variable) => {
     return css + `${variable}:${parsed[variable]};`;
   }, '');
 };
 
-export const brandColorToThemeData = (brandColor: string): ImmutableMap<string, any> => {
-  const { h, s, l } = rgbToHsl(hexToRgb(brandColor));
-  return ImmutableMap({
-    'brand-color_h': h,
-    'brand-color_s': `${s}%`,
-    'brand-color_l': `${l}%`,
-  });
+const legacyColorsToTailwind = (brandColor: string, accentColor: string): TailwindColorPalette => {
+  return {
+    primary: tintify(brandColor),
+    accent: tintify(accentColor ? accentColor : generateAccent(brandColor)),
+  };
 };
 
-export const accentColorToThemeData = (brandColor: string, accentColor: string): ImmutableMap<string, any> => {
-  if (accentColor) {
-    const { h, s, l } = rgbToHsl(hexToRgb(accentColor));
-
-    return ImmutableMap({
-      'accent-color_h': h,
-      'accent-color_s': `${s}%`,
-      'accent-color_l': `${l}%`,
-    });
-  }
-
-  const { h } = rgbToHsl(hexToRgb(brandColor));
-  return ImmutableMap({
-    'accent-color_h': h - 15,
-    'accent-color_s': '86%',
-    'accent-color_l': '44%',
-  });
+export const themeColorsToCSS = (brandColor: string, accentColor: string): string => {
+  const colors = legacyColorsToTailwind(brandColor, accentColor);
+  return colorsToCss(colors);
 };
-
-export const themeDataToCss = (themeData: ImmutableMap<string, any>): string => (
-  themeData
-    .entrySeq()
-    .reduce((acc, cur) => acc + `--${cur[0]}:${cur[1]};`, '')
-);
-
-export const themeColorsToCSS = (brandColor: string, accentColor: string): string =>
-  themeDataToCss(brandColorToThemeData(brandColor).merge(accentColorToThemeData(brandColor, accentColor)));