From ffb321bedca46d6987c7b31dd58e5dea96ea2ea2 Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Wed, 10 Jul 2019 14:06:19 +0200
Subject: WIP plugins: load theme on client side

---
 client/src/app/core/theme/theme.service.ts | 124 ++++++++++++++++++++++-------
 1 file changed, 94 insertions(+), 30 deletions(-)

(limited to 'client/src/app/core/theme/theme.service.ts')

diff --git a/client/src/app/core/theme/theme.service.ts b/client/src/app/core/theme/theme.service.ts
index 50c19ecac..ad59c203b 100644
--- a/client/src/app/core/theme/theme.service.ts
+++ b/client/src/app/core/theme/theme.service.ts
@@ -1,41 +1,105 @@
 import { Injectable } from '@angular/core'
-import { peertubeLocalStorage } from '@app/shared/misc/peertube-local-storage'
+import { AuthService } from '@app/core/auth'
+import { ServerService } from '@app/core/server'
+import { environment } from '../../../environments/environment'
+import { PluginService } from '@app/core/plugins/plugin.service'
+import { ServerConfigTheme } from '@shared/models'
 
 @Injectable()
 export class ThemeService {
-  private theme = document.querySelector('body')
-  private darkTheme = false
-  private previousTheme: { [ id: string ]: string } = {}
-
-  constructor () {
-    // initialise the alternative theme with dark theme colors
-    this.previousTheme['mainBackgroundColor'] = '#111111'
-    this.previousTheme['mainForegroundColor'] = '#fff'
-    this.previousTheme['submenuColor'] = 'rgb(32,32,32)'
-    this.previousTheme['inputColor'] = 'gray'
-    this.previousTheme['inputPlaceholderColor'] = '#fff'
-
-    this.darkTheme = (peertubeLocalStorage.getItem('theme') === 'dark')
-    if (this.darkTheme) this.toggleDarkTheme(false)
+
+  private oldThemeName: string
+  private themes: ServerConfigTheme[] = []
+
+  constructor (
+    private auth: AuthService,
+    private pluginService: PluginService,
+    private server: ServerService
+  ) {}
+
+  initialize () {
+    this.server.configLoaded
+        .subscribe(() => {
+          this.injectThemes()
+
+          this.listenUserTheme()
+        })
+  }
+
+  private injectThemes () {
+    this.themes = this.server.getConfig().theme.registered
+
+    console.log('Injecting %d themes.', this.themes.length)
+
+    const head = document.getElementsByTagName('head')[0]
+
+    for (const theme of this.themes) {
+
+      for (const css of theme.css) {
+        const link = document.createElement('link')
+
+        const href = environment.apiUrl + `/themes/${theme.name}/${theme.version}/css/${css}`
+        link.setAttribute('href', href)
+        link.setAttribute('rel', 'alternate stylesheet')
+        link.setAttribute('type', 'text/css')
+        link.setAttribute('title', theme.name)
+        link.setAttribute('disabled', '')
+
+        head.appendChild(link)
+      }
+    }
+  }
+
+  private getCurrentTheme () {
+    if (this.auth.isLoggedIn()) {
+      const theme = this.auth.getUser().theme
+      if (theme !== 'instance-default') return theme
+    }
+
+    return this.server.getConfig().theme.default
   }
 
-  toggleDarkTheme (setLocalStorage = true) {
-    // switch properties
-    this.switchProperty('mainBackgroundColor')
-    this.switchProperty('mainForegroundColor')
-    this.switchProperty('submenuColor')
-    this.switchProperty('inputColor')
-    this.switchProperty('inputPlaceholderColor')
-
-    if (setLocalStorage) {
-      this.darkTheme = !this.darkTheme
-      peertubeLocalStorage.setItem('theme', (this.darkTheme) ? 'dark' : 'default')
+  private loadTheme (name: string) {
+    const links = document.getElementsByTagName('link')
+    for (let i = 0; i < links.length; i++) {
+      const link = links[ i ]
+      if (link.getAttribute('rel').indexOf('style') !== -1 && link.getAttribute('title')) {
+        link.disabled = link.getAttribute('title') !== name
+      }
+    }
+  }
+
+  private updateCurrentTheme () {
+    if (this.oldThemeName) {
+      const oldTheme = this.getTheme(this.oldThemeName)
+      if (oldTheme) {
+        console.log('Removing scripts of old theme %s.', this.oldThemeName)
+        this.pluginService.removePlugin(oldTheme)
+      }
+    }
+
+    const currentTheme = this.getCurrentTheme()
+
+    console.log('Enabling %s theme.', currentTheme)
+
+    this.loadTheme(currentTheme)
+    const theme = this.getTheme(currentTheme)
+    if (theme) {
+      console.log('Adding scripts of theme %s.', currentTheme)
+      this.pluginService.addPlugin(theme)
+
+      this.pluginService.reloadLoadedScopes()
     }
+
+    this.oldThemeName = currentTheme
+  }
+
+  private listenUserTheme () {
+    this.auth.userInformationLoaded
+      .subscribe(() => this.updateCurrentTheme())
   }
 
-  private switchProperty (property: string, newValue?: string) {
-    const propertyOldvalue = window.getComputedStyle(this.theme).getPropertyValue('--' + property)
-    this.theme.style.setProperty('--' + property, (newValue) ? newValue : this.previousTheme[property])
-    this.previousTheme[property] = propertyOldvalue
+  private getTheme (name: string) {
+    return this.themes.find(t => t.name === name)
   }
 }
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