なんかもうめっちゃ変えた

packages/backend/src/core/IdService.ts

@@ -0,0 +1,33 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { ulid } from 'ulid';
+import { DI } from '@/di-symbols.js';
+import { Config } from '@/config.js';
+import { genAid } from '@/misc/id/aid.js';
+import { genMeid } from '@/misc/id/meid.js';
+import { genMeidg } from '@/misc/id/meidg.js';
+import { genObjectId } from '@/misc/id/object-id.js';
+
+@Injectable()
+export class IdService {
+	#metohd: string;
+
+	constructor(
+		@Inject(DI.config)
+		private config: Config,
+	) {
+		this.#metohd = config.id.toLowerCase();
+	}
+
+	public genId(date?: Date): string {
+		if (!date || (date > new Date())) date = new Date();
+	
+		switch (this.#metohd) {
+			case 'aid': return genAid(date);
+			case 'meid': return genMeid(date);
+			case 'meidg': return genMeidg(date);
+			case 'ulid': return ulid(date.getTime());
+			case 'objectid': return genObjectId(date);
+			default: throw new Error('unrecognized id generation method');
+		}
+	}
+}