refactor: Clarify main process architecture

* stores: reactive data structures to hold application state
* controllers: subscribe to store changes and call store actions in
  response to external events from services
* services: integrate with the nodejs and electron environment (should
  be mocked for unit testing)

3 files changed, 21 insertions, 56 deletions

diff --git a/packages/main/src/services/impl/ConfigPersistenceImpl.ts b/packages/main/src/services/ConfigPersistenceService.ts
index 097ab74..85b0088 100644
--- a/packages/main/src/services/impl/ConfigPersistenceImpl.ts
+++ b/packages/main/src/services/ConfigPersistenceService.ts
@@ -25,10 +25,11 @@ import { throttle } from 'lodash';
 import { IDisposer } from 'mobx-state-tree';
 import { join } from 'path';
 
-import { CONFIG_DEBOUNCE_TIME, ConfigPersistence, ReadConfigResult } from '../ConfigPersistence';
-import type { ConfigSnapshotOut } from  '../../stores/Config';
+import type { ConfigSnapshotOut } from  '../stores/Config';
 
-export class ConfigPersistenceImpl implements ConfigPersistence {
+export type ReadConfigResult = { found: true; data: unknown; } | { found: false; };
+
+export class ConfigPersistenceService {
   readonly #userDataDir: string;
 
   readonly #configFileName: string;
@@ -69,7 +70,7 @@ export class ConfigPersistenceImpl implements ConfigPersistence {
     return mtime;
   }
 
-  watchConfig(callback: (mtime: Date) => Promise<void>): IDisposer {
+  watchConfig(callback: (mtime: Date) => Promise<void>, throttleMs: number): IDisposer {
     const configChanged = throttle(async () => {
       let mtime: Date;
       try {
@@ -82,7 +83,7 @@ export class ConfigPersistenceImpl implements ConfigPersistence {
         throw err;
       }
       return callback(mtime);
-    }, CONFIG_DEBOUNCE_TIME);
+    }, throttleMs);
 
     const watcher = watch(this.#userDataDir, {
       persistent: false,
diff --git a/packages/main/src/services/MainEnv.ts b/packages/main/src/services/MainEnv.ts
deleted file mode 100644
index 23ee9a1..0000000
--- a/packages/main/src/services/MainEnv.ts
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * Copyright (C)  2021-2022 Kristóf Marussy <kristof@marussy.com>
- *
- * This file is part of Sophie.
- *
- * Sophie 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, version 3.
- *
- * 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 <https://www.gnu.org/licenses/>.
- *
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import { IAnyStateTreeNode, getEnv as getAnyEnv } from 'mobx-state-tree';
-
-import type { ConfigPersistence } from './ConfigPersistence';
-
-export interface MainEnv {
-  configPersistence: ConfigPersistence;
-}
-
-/**
- * Gets a well-typed environment from `model`.
- *
- * Only useable inside state trees created by `createAndConnectRootStore`.
- *
- * @param model The state tree node.
- */
-export function getEnv(model: IAnyStateTreeNode): MainEnv {
-  return getAnyEnv<MainEnv>(model);
-}
diff --git a/packages/main/src/services/ConfigPersistence.ts b/packages/main/src/services/NativeThemeService.ts
index f9a82de..7a26c3c 100644
--- a/packages/main/src/services/ConfigPersistence.ts
+++ b/packages/main/src/services/NativeThemeService.ts
@@ -18,19 +18,21 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { IDisposer } from 'mobx-state-tree';
-import ms from 'ms';
+import { nativeTheme } from 'electron';
+import type { IDisposer } from 'mobx-state-tree';
+import type { ThemeSource } from '@sophie/shared';
 
-import type { ConfigSnapshotOut } from '../stores/Config';
+export class NativeThemeService {
+  setThemeSource(themeSource: ThemeSource): void {
+    nativeTheme.themeSource = themeSource;
+  }
 
-export const CONFIG_DEBOUNCE_TIME: number = ms('1s');
-
-export type ReadConfigResult = { found: true; data: unknown; } | { found: false; };
-
-export interface ConfigPersistence {
-  readConfig(): Promise<ReadConfigResult>;
-
-  writeConfig(configSnapshot: ConfigSnapshotOut): Promise<Date>;
-
-  watchConfig(callback: (mtime: Date) => Promise<void>): IDisposer;
+  onShouldUseDarkColorsUpdated(callback: (shouldUseDarkColors: boolean) => void): IDisposer {
+    const wrappedCallback = () => {
+      callback(nativeTheme.shouldUseDarkColors);
+    };
+    wrappedCallback();
+    nativeTheme.on('updated', wrappedCallback);
+    return () => nativeTheme.off('updated', wrappedCallback);
+  }
 }