From 05d2b6f67e5f8ccaf1bdbb3b5d62bac0d2fc2f31 Mon Sep 17 00:00:00 2001
From: Hakadao <a578457889743@gmail.com>
Date: Mon, 5 Aug 2024 02:30:13 +0800
Subject: [PATCH] refactor: update hexToHSL function to convert hex color to
 HSLA

---
 src/contentScripts/views/App.vue |  6 +--
 src/utils/main.ts                | 67 +++++++++++++++++++++++++++-----
 2 files changed, 60 insertions(+), 13 deletions(-)

diff --git a/src/contentScripts/views/App.vue b/src/contentScripts/views/App.vue
index 3ea704e8..35dee5dd 100644
--- a/src/contentScripts/views/App.vue
+++ b/src/contentScripts/views/App.vue
@@ -9,7 +9,7 @@ import { useDark } from '~/composables/useDark'
 import { OVERLAY_SCROLL_BAR_SCROLL } from '~/constants/globalEvents'
 import { AppPage, LanguageType } from '~/enums/appEnums'
 import { accessKey, settings } from '~/logic'
-import { getUserID, hexToRGBA, isHomePage, scrollToTop } from '~/utils/main'
+import { getUserID, hexToHSL, isHomePage, scrollToTop } from '~/utils/main'
 import emitter from '~/utils/mitt'
 
 const { isDark } = useDark()
@@ -149,12 +149,12 @@ function setAppThemeColor() {
   if (bewlyElement) {
     bewlyElement.style.setProperty('--bew-theme-color', settings.value.themeColor)
     for (let i = 0; i < 9; i++)
-      bewlyElement.style.setProperty(`--bew-theme-color-${i + 1}0`, hexToRGBA(settings.value.themeColor, i * 0.1 + 0.1))
+      bewlyElement.style.setProperty(`--bew-theme-color-${i + 1}0`, hexToHSL(settings.value.themeColor, i * 0.1 + 0.1))
   }
 
   document.documentElement.style.setProperty('--bew-theme-color', settings.value.themeColor)
   for (let i = 0; i < 9; i++)
-    document.documentElement.style.setProperty(`--bew-theme-color-${i + 1}0`, hexToRGBA(settings.value.themeColor, i * 0.1 + 0.1))
+    document.documentElement.style.setProperty(`--bew-theme-color-${i + 1}0`, hexToHSL(settings.value.themeColor, i * 0.1 + 0.1))
 }
 
 function handleBackToTop(targetScrollTop = 0 as number) {
diff --git a/src/utils/main.ts b/src/utils/main.ts
index 2304df35..79d9980e 100644
--- a/src/utils/main.ts
+++ b/src/utils/main.ts
@@ -48,21 +48,68 @@ export function openLinkToNewTab(url: string) {
 }
 
 /**
- * Convert a hex color value to RGBA, thanks ChatGPT 🫡
+ * Convert a hex color value to HSLA, thanks ChatGPT 🫡
  * @param hex hex color value
  * @param alpha color opacity
- * @returns RGBA or RGB color string
+ * @returns HSLA or HSL color string
  */
-export function hexToRGBA(hex: string, alpha: number): string {
-  const r = Number.parseInt(hex.slice(1, 3), 16)
-  const g = Number.parseInt(hex.slice(3, 5), 16)
-  const b = Number.parseInt(hex.slice(5, 7), 16)
+export function hexToHSL(hex: string, alpha: number | null = null): string {
+  // Remove the hash at the start if it's there
+  hex = hex.replace(/^#/, '')
 
-  if (alpha)
-    return `rgba(${r}, ${g}, ${b}, ${alpha})`
+  // Ensure the input is valid
+  if (hex.length !== 6) {
+    throw new Error('Invalid HEX color.')
+  }
 
-  else
-    return `rgb(${r}, ${g}, ${b})`
+  // Parse the r, g, b values
+  let r = Number.parseInt(hex.substring(0, 2), 16)
+  let g = Number.parseInt(hex.substring(2, 4), 16)
+  let b = Number.parseInt(hex.substring(4, 6), 16)
+
+  // Convert r, g, b to percentages
+  r /= 255
+  g /= 255
+  b /= 255
+
+  // Find the greatest and smallest channel values
+  const max = Math.max(r, g, b)
+  const min = Math.min(r, g, b)
+  let h: number = 0
+  let s: number = 0
+  let l: number = (max + min) / 2
+
+  // Calculate the hue
+  if (max === min) {
+    h = s = 0 // achromatic
+  }
+  else {
+    const d = max - min
+    s = l > 0.5 ? d / (2 - max - min) : d / (max + min)
+
+    switch (max) {
+      case r:
+        h = (g - b) / d + (g < b ? 6 : 0)
+        break
+      case g:
+        h = (b - r) / d + 2
+        break
+      case b:
+        h = (r - g) / d + 4
+        break
+    }
+
+    h /= 6
+  }
+
+  // Convert to degrees and percentages
+  h = Math.round(h * 360)
+  s = Math.round(s * 100)
+  l = Math.round(l * 100)
+
+  if (alpha !== null)
+    return `hsla(${h}, ${s}%, ${l}%, ${alpha})`
+  return `hsla(${h}, ${s}%, ${l}%)`
 }
 
 /**