feat: build themes into a centralised plugin

src/interface/components/store/Backgrounds.svelte

@@ -1,10 +1,12 @@
 <script lang="ts">
   import { hasEnoughStorageSpace, isIndexedDBSupported, writeData, openDatabase, readAllData, deleteData } from '@/interface/hooks/BackgroundDataLoader';
-  import { setTheme } from '@/seqta/ui/themes/setTheme';
   import Spinner from '../Spinner.svelte';
   import { settingsState } from '@/seqta/utils/listeners/SettingsState'
   import Fuse from 'fuse.js';
   import { backgroundUpdates } from '@/interface/hooks/BackgroundUpdates'
+  import { ThemeManager } from '@/plugins/built-in/themes/theme-manager'
+
+  const themeManager = ThemeManager.getInstance();
 
   type Background = { id: string; category: string; type: string; lowResUrl: string; highResUrl: string; name: string; description: string; featured?: boolean };
   let { searchTerm } = $props<{ searchTerm: string }>();
@@ -170,7 +172,7 @@
   
   function selectNoBackground() {
     selectedBackground = null;
-    setTheme('');
+    themeManager.setTheme('');
   }
 </script>
 

src/interface/components/themes/ThemeSelector.svelte

@@ -1,16 +1,13 @@
 <script lang="ts">
   import type { CustomTheme, ThemeList } from '@/types/CustomThemes'
-  import { getAvailableThemes } from '@/seqta/ui/themes/getAvailableThemes'
   import { onDestroy, onMount } from 'svelte'
   import { OpenThemeCreator } from '@/seqta/ui/ThemeCreator'
-  import shareTheme from '@/seqta/ui/themes/shareTheme'
-  import { InstallTheme } from '@/seqta/ui/themes/downloadTheme'
-  import { disableTheme } from '@/seqta/ui/themes/disableTheme'
-  import { setTheme } from '@/seqta/ui/themes/setTheme'
-  import { deleteTheme } from '@/seqta/ui/themes/deleteTheme'
   import { OpenStorePage } from '@/seqta/ui/renderStore'
   import { themeUpdates } from '@/interface/hooks/ThemeUpdates'
   import { closeExtensionPopup } from '@/seqta/utils/Closers/closeExtensionPopup'
+  import { ThemeManager } from '@/plugins/built-in/themes/theme-manager'
+
+  const themeManager = ThemeManager.getInstance();
 
   let themes = $state<ThemeList | null>(null);
   let { isEditMode } = $props<{ isEditMode: boolean }>();
@@ -20,10 +17,10 @@
   const handleThemeClick = async (theme: CustomTheme) => {
     if (isEditMode) return;
     if (theme.id === themes?.selectedTheme) {
-      await disableTheme();
+      await themeManager.disableTheme();
       themes.selectedTheme = '';
     } else {
-      await setTheme(theme.id);
+      await themeManager.setTheme(theme.id);
       if (!themes) return;
       themes.selectedTheme = theme.id;
     }
@@ -31,13 +28,13 @@
 
   const handleThemeDelete = async (themeId: string) => {
     try {
-      await deleteTheme(themeId);
+      await themeManager.deleteTheme(themeId);
       if (!themes) return;
 
       themes.themes = themes.themes.filter(theme => theme.id !== themeId);
       if (themeId === themes.selectedTheme) {
         themes.selectedTheme = '';
-        await disableTheme();
+        await themeManager.disableTheme();
       }
     } catch (error) {
       console.error('Error deleting theme:', error);
@@ -46,7 +43,7 @@
 
   const handleShareTheme = async (theme: CustomTheme) => {
     try {
-      await shareTheme(theme.id);
+      await themeManager.shareTheme(theme.id);
     } catch (error) {
       console.error('Error sharing theme:', error);
     }
@@ -72,7 +69,7 @@
       try {
         const result = JSON.parse(event.target?.result as string);
         tempTheme = result;
-        await InstallTheme(result);
+        await themeManager.installTheme(result);
         await fetchThemes();
       } catch (error) {
         console.error('Error parsing file:', error);
@@ -84,7 +81,10 @@
   }
 
   const fetchThemes = async () => {
-    themes = await getAvailableThemes();
+    themes = {
+      themes: await themeManager.getAvailableThemes(),
+      selectedTheme: themeManager.getSelectedThemeId() || '',
+    }
   }
 
   onMount(async () => {

src/interface/pages/store.svelte

@@ -9,16 +9,15 @@
   import type { Theme } from '../types/Theme'
   import browser from 'webextension-polyfill'
   import ThemeModal from '../components/store/ThemeModal.svelte'
-  import { StoreDownloadTheme } from '@/seqta/ui/themes/downloadTheme'
-  import { setTheme } from '@/seqta/ui/themes/setTheme'
   import Header from '../components/store/Header.svelte'
-  import { deleteTheme } from '@/seqta/ui/themes/deleteTheme'
-  import { getAvailableThemes } from '@/seqta/ui/themes/getAvailableThemes'
   import { themeUpdates } from '../hooks/ThemeUpdates'
+  import { ThemeManager } from '@/plugins/built-in/themes/theme-manager'
 
   import { loadBackground } from '@/seqta/ui/ImageBackgrounds'
   import Backgrounds from '../components/store/Backgrounds.svelte'
 
+  const themeManager = ThemeManager.getInstance();
+
   // State variables
   let searchTerm = $state('');
   let themes = $state<Theme[]>([]);
@@ -33,8 +32,8 @@
   let selectedBackground = $state<string | null>(null);
 
   const fetchCurrentThemes = async () => {
-    const themes = await getAvailableThemes();
-    currentThemes = themes.themes.filter(theme => theme !== null).map(theme => theme.id);
+    const themes = await themeManager.getAvailableThemes();
+    currentThemes = themes.filter(theme => theme !== null).map(theme => theme.id);
   };
 
   const setDisplayTheme = (theme: Theme | null) => {
@@ -123,8 +122,8 @@
               {setDisplayTheme}
               onInstall={async () => {
                 if (displayTheme) {
-                  await StoreDownloadTheme({themeContent: displayTheme})
-                  setTheme(displayTheme.id);
+                  await themeManager.downloadTheme(displayTheme);
+                  await themeManager.setTheme(displayTheme.id);
                   themeUpdates.triggerUpdate();
                   await fetchCurrentThemes();
                 }
@@ -132,7 +131,7 @@
               onRemove={async () => {
                 if (displayTheme?.id) {
                   console.debug('deleting theme', displayTheme.id);
-                  deleteTheme(displayTheme.id)
+                  await themeManager.deleteTheme(displayTheme.id);
                   themeUpdates.triggerUpdate();
                   await fetchCurrentThemes();
                 }

src/interface/pages/themeCreator.svelte

@@ -7,7 +7,6 @@
   import { type LoadedCustomTheme } from '@/types/CustomThemes'
 
   import { settingsState } from '@/seqta/utils/listeners/SettingsState'
-  import { getTheme } from '@/seqta/ui/themes/getTheme'
 
   import Divider from '@/interface/components/themeCreator/divider.svelte'
   import Switch from '@/interface/components/Switch.svelte'
@@ -22,14 +21,13 @@
     handleImageVariableChange,
     handleCoverImageUpload
   } from '../utils/themeImageHandlers';
-  import { ClearThemePreview, UpdateThemePreview } from '@/seqta/ui/themes/UpdateThemePreview'
-  import { saveTheme } from '@/seqta/ui/themes/saveTheme'
   import { CloseThemeCreator } from '@/seqta/ui/ThemeCreator'
   import { themeUpdates } from '../hooks/ThemeUpdates'
-  import { disableTheme } from '@/seqta/ui/themes/disableTheme'
-  import { setTheme } from '@/seqta/ui/themes/setTheme'
+  import { ThemeManager } from '@/plugins/built-in/themes/theme-manager'
 
   const { themeID } = $props<{ themeID: string }>()
+  const themeManager = ThemeManager.getInstance();
+
   let theme = $state<LoadedCustomTheme>({
     id: uuidv4(),
     name: '',
@@ -62,10 +60,10 @@
   }
 
   onMount(async () => {
-    await disableTheme();
+    await themeManager.disableTheme();
 
     if (themeID) {
-      const tempTheme = await getTheme(themeID)
+      const tempTheme = await themeManager.getTheme(themeID)
 
       if (!tempTheme) return
 
@@ -104,7 +102,7 @@
     theme = await handleCoverImageUpload(event, theme);
   }
 
-  function submitTheme() {
+  async function submitTheme() {
     const themeClone = JSON.parse(JSON.stringify(theme));
 
     // re-insert blobs into themeClone
@@ -114,15 +112,17 @@
     }))
     themeClone.coverImage = theme.coverImage
 
-    ClearThemePreview();
-    saveTheme(themeClone);
-    setTheme(themeClone.id);
+    themeManager.clearPreview();
+    await themeManager.saveTheme(themeClone);
+    await themeManager.setTheme(themeClone.id);
     themeUpdates.triggerUpdate();
     CloseThemeCreator();
   }
 
   $effect(() => {
-    UpdateThemePreview(theme);
+    if (themeLoaded) {
+      void themeManager.updatePreview(theme);
+    }
   });
 
   type SettingType = 'switch' | 'button' | 'slider' | 'colourPicker' | 'select' | 'codeEditor' | 'imageUpload' | 'conditional' | 'lightDarkToggle';
@@ -215,7 +215,7 @@
                   bind:value={image.variableName}
                   oninput={(e) => onImageVariableChange(image.id, e.currentTarget.value)}
                   placeholder="CSS Variable Name"
-                  class="grow flex-3 w-full p-2 transition border-0 rounded-lg dark:placeholder-zinc-300 bg-zinc-200 dark:bg-zinc-600/50 focus:bg-zinc-300/50 dark:focus:bg-zinc-600"
+                  class="p-2 w-full rounded-lg border-0 transition grow flex-3 dark:placeholder-zinc-300 bg-zinc-200 dark:bg-zinc-600/50 focus:bg-zinc-300/50 dark:focus:bg-zinc-600"
                 />
                 <button onclick={() => onRemoveImage(image.id)} class="p-2 transition dark:text-white">
                   <span class='text-xl font-IconFamily'>{'\ued8c'}</span>
@@ -253,7 +253,7 @@
 
 <div class='h-screen overflow-y-scroll {$settingsState.DarkMode && "dark"} no-scrollbar'>
   {#if codeEditorFullscreen}
-    <div class="absolute inset-0 z-10000 bg-white dark:bg-zinc-900 dark:text-white">
+    <div class="absolute inset-0 bg-white z-10000 dark:bg-zinc-900 dark:text-white">
       <div class="sticky top-0 px-2 h-screen">
         <div class="flex justify-between items-center my-4">
           <h2 class="text-xl font-bold">Custom CSS</h2>