feat(subtitles): add local Japanese subtitle generation (#240)

src/main/runtime/subtitle-generation-ipc.ts

@@ -0,0 +1,43 @@
+import type { IpcMain, WebContents } from 'electron';
+import { IPC_CHANNELS } from '../../shared/ipc/contracts';
+import { isSubtitleGenerationModelId } from '../../shared/subtitle-generation-model-catalog';
+import type { createSubtitleGenerationRuntime } from './subtitle-generation-runtime';
+
+export function registerSubtitleGenerationIpc(deps: {
+  ipc: Pick<IpcMain, 'handle'>;
+  isAllowedSender: (sender: WebContents) => boolean;
+  openModal: () => Promise<boolean>;
+  runtime: ReturnType<typeof createSubtitleGenerationRuntime>;
+}): void {
+  const handlers = [
+    [IPC_CHANNELS.request.requestSubtitleGenerationOpen, () => deps.openModal()],
+    [IPC_CHANNELS.request.getSubtitleGenerationStatus, () => deps.runtime.getStatus()],
+    [
+      IPC_CHANNELS.request.selectSubtitleGenerationModel,
+      (model: unknown) => {
+        if (!isSubtitleGenerationModelId(model))
+          throw new Error('Unknown subtitle generation model.');
+        return deps.runtime.selectModel(model);
+      },
+    ],
+    [IPC_CHANNELS.request.startSubtitleGeneration, () => deps.runtime.start()],
+    [IPC_CHANNELS.request.downloadSubtitleGenerationModel, () => deps.runtime.download()],
+    [IPC_CHANNELS.request.downloadSubtitleGenerationVadModel, () => deps.runtime.downloadVad()],
+    [
+      IPC_CHANNELS.request.setSubtitleGenerationVadEnabled,
+      (enabled: unknown) => {
+        if (typeof enabled !== 'boolean')
+          throw new Error('Speech detection selection must be a boolean.');
+        return deps.runtime.setVadEnabled(enabled);
+      },
+    ],
+    [IPC_CHANNELS.request.cancelSubtitleGeneration, () => deps.runtime.cancel()],
+  ] as const;
+  for (const [channel, handler] of handlers) {
+    deps.ipc.handle(channel, (event, payload: unknown) => {
+      if (!deps.isAllowedSender(event.sender))
+        throw new Error('Subtitle generation is only available from the overlay.');
+      return handler(payload);
+    });
+  }
+}