db: wip

Signed-off-by: Zixuan James Li <[email protected]>

Author: PIG208

lib/model/database.dart

@@ -41,13 +41,55 @@ class Accounts extends Table {
   ];
 }
 
+/// The visual theme of the app.
+///
+/// See [zulipThemeData] for how themes are determined.
+enum ThemeSetting {
+  /// Corresponds to the default platform setting.
+  none,
+
+  /// Corresponds to [Brightness.light].
+  light,
+
+  /// Corresponds to [Brightness.dark].
+  dark,
+}
+
+/// What browser the user has set to use for opening links in messages.
+///
+/// See https://chat.zulip.org/#narrow/stream/48-mobile/topic/in-app.20browser
+/// for the reasoning behind these options.
+enum BrowserPreference {
+  /// Use [UrlLaunchMode.externalApplication] on iOS,
+  /// [UrlLaunchMode.platformDefault] on Android.
+  none,
+
+  /// Use the in-app browser.
+  embedded,
+
+  /// Use the user's default browser app.
+  external,
+}
+
+/// The table of the user's chosen settings independent of account, on this
+/// client.
+///
+/// These apply across all the user's accounts on this client (i.e. on this
+/// install of the app on this device).
+@DataClassName('GlobalSettingsData')
+class GlobalSettings extends Table {
+  Column<String> get themeSetting => textEnum<ThemeSetting>()();
+
+  Column<String> get browserPreference => textEnum<BrowserPreference>()();
+}
+
 class UriConverter extends TypeConverter<Uri, String> {
   const UriConverter();
   @override String toSql(Uri value) => value.toString();
   @override Uri fromSql(String fromDb) => Uri.parse(fromDb);
 }
 
-@DriftDatabase(tables: [Accounts])
+@DriftDatabase(tables: [Accounts, GlobalSettings])
 class AppDatabase extends _$AppDatabase {
   AppDatabase(super.e);
 
@@ -58,7 +100,7 @@ class AppDatabase extends _$AppDatabase {
   //  * Write a migration in `onUpgrade` below.
   //  * Write tests.
   @override
-  int get schemaVersion => 2; // See note.
+  int get schemaVersion => 3; // See note.
 
   @override
   MigrationStrategy get migration {
@@ -84,6 +126,10 @@ class AppDatabase extends _$AppDatabase {
         if (from < 2 && 2 <= to) {
           await m.addColumn(accounts, accounts.ackedPushToken);
         }
+
+        if (from < 3 && 3 <= to) {
+          await m.createTable(globalSettings);
+        }
         // New migrations go here.
       }
     );
@@ -104,6 +150,20 @@ class AppDatabase extends _$AppDatabase {
       rethrow;
     }
   }
+
+  Future<GlobalSettingsData> ensureGlobalSettings() async {
+    final settings = await select(globalSettings).getSingleOrNull();
+    // TODO(db): Enforce the singleton constraint more robustly.
+    if (settings != null) {
+      return settings;
+    }
+
+    await into(globalSettings).insert(GlobalSettingsCompanion.insert(
+      themeSetting: ThemeSetting.none,
+      browserPreference: BrowserPreference.none,
+    ));
+    return select(globalSettings).getSingle();
+  }
 }
 
 class AccountAlreadyExistsException implements Exception {}