1 files changed, 172 insertions, 0 deletions
diff --git a/apps/theming/lib/Service/ThemesService.php b/apps/theming/lib/Service/ThemesService.php
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+++ b/apps/theming/lib/Service/ThemesService.php
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+<?php
+/**
+ * @copyright Copyright (c) 2022 John Molakvoæ <skjnldsv@protonmail.com>
+ *
+ * @author John Molakvoæ <skjnldsv@protonmail.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OCA\Theming\Service;
+
+use OCA\Theming\AppInfo\Application;
+use OCA\Theming\ITheme;
+use OCA\Theming\Themes\DarkHighContrastTheme;
+use OCA\Theming\Themes\DarkTheme;
+use OCA\Theming\Themes\DefaultTheme;
+use OCA\Theming\Themes\DyslexiaFont;
+use OCA\Theming\Themes\HighContrastTheme;
+use OCP\IConfig;
+use OCP\IUser;
+use OCP\IUserSession;
+
+class ThemesService {
+	private IUserSession $userSession;
+	private IConfig $config;
+
+	/** @var ITheme[] */
+	private array $themesProviders;
+
+	public function __construct(IUserSession $userSession,
+								IConfig $config,
+								DefaultTheme $defaultTheme,
+								DarkTheme $darkTheme,
+								HighContrastTheme $highContrastTheme,
+								DarkHighContrastTheme $darkHighContrastTheme,
+								DyslexiaFont $dyslexiaFont) {
+		$this->userSession = $userSession;
+		$this->config = $config;
+
+		// Register themes
+		$this->themesProviders = [
+			$defaultTheme->getId()			=> $defaultTheme,
+			$darkTheme->getId()				=> $darkTheme,
+			$highContrastTheme->getId()		=> $highContrastTheme,
+			$darkHighContrastTheme->getId()	=> $darkHighContrastTheme,
+			$dyslexiaFont->getId()			=> $dyslexiaFont,
+		];
+	}
+
+	/**
+	 * Get the list of all registered themes
+	 * 
+	 * @return ITheme[]
+	 */
+	public function getThemes(): array {
+		return $this->themesProviders;
+	}
+
+	/**
+	 * Enable a theme for the logged-in user
+	 * 
+	 * @param ITheme $theme the theme to enable
+	 * @return string[] the enabled themes
+	 */
+	public function enableTheme(ITheme $theme): array {
+		$themesIds = $this->getEnabledThemes();
+
+		// If already enabled, ignore
+		if (in_array($theme->getId(), $themesIds)) {
+			return $themesIds;
+		}
+
+		/** @var ITheme[] */
+		$themes = array_map(function($themeId) {
+			return $this->getThemes()[$themeId];
+		}, $themesIds);
+
+		// Filtering all themes with the same type
+		$filteredThemes = array_filter($themes, function(ITheme $t) use ($theme) {
+			return $theme->getType() === $t->getType();
+		});
+
+		// Retrieve IDs only
+		/** @var string[] */
+		$filteredThemesIds = array_map(function(ITheme $t) {
+			return $t->getId();
+		}, array_values($filteredThemes));
+
+		$enabledThemes = array_merge(array_diff($themesIds, $filteredThemesIds), [$theme->getId()]);
+		$this->setEnabledThemes($enabledThemes);
+
+		return $enabledThemes;
+	}
+
+	/**
+	 * Disable a theme for the logged-in user
+	 * 
+	 * @param ITheme $theme the theme to disable
+	 * @return string[] the enabled themes
+	 */
+	public function disableTheme(ITheme $theme): array {
+		$themesIds = $this->getEnabledThemes();
+
+		// If enabled, removing it
+		if (in_array($theme->getId(), $themesIds)) {
+			$enabledThemes = array_diff($themesIds, [$theme->getId()]);
+			$this->setEnabledThemes($enabledThemes);
+			return $enabledThemes;
+		}
+		
+		return $themesIds;
+	}
+
+	/**
+	 * Check whether a theme is enabled or not
+	 * for the logged-in user
+	 * 
+	 * @return bool
+	 */
+	public function isEnabled(ITheme $theme): bool {
+		$user = $this->userSession->getUser();
+		if ($user instanceof IUser) {
+			// Using keys as it's faster
+			$themes = $this->getEnabledThemes();
+			return in_array($theme->getId(), $themes);
+		}
+		return false;
+	}
+
+	/**
+	 * Get the list of all enabled themes IDs
+	 * for the logged-in user
+	 * 
+	 * @return string[]
+	 */
+	public function getEnabledThemes(): array {
+		$user = $this->userSession->getUser();
+		if ($user === null) {
+			return [];
+		}
+
+		try {
+			return json_decode($this->config->getUserValue($user->getUID(), Application::APP_ID, 'enabled-themes', '[]'));
+		} catch (\Exception $e) {
+			return [];
+		}
+	}
+
+	/**
+	 * Set the list of enabled themes 
+	 * for the logged-in user
+	 * 
+	 * @param string[] $themes the list of enabled themes IDs
+	 */
+	private function setEnabledThemes(array $themes): void {
+		$user = $this->userSession->getUser();
+		$this->config->setUserValue($user->getUID(), Application::APP_ID, 'enabled-themes', json_encode(array_unique(array_values($themes))));
+	}
+}