feat: add top-artists report

src/reports/dto/get-top-artists-report.dto.ts

@@ -0,0 +1,18 @@
+import { IsEnum, IsISO8601, ValidateIf } from "class-validator";
+import { User } from "../../users/user.entity";
+import { TimePreset } from "../timePreset.enum";
+
+export class GetTopArtistsReportDto {
+  user: User;
+
+  @IsEnum(TimePreset)
+  timePreset: TimePreset;
+
+  @ValidateIf((o) => o.timePreset === TimePreset.CUSTOM)
+  @IsISO8601()
+  customTimeStart: string;
+
+  @ValidateIf((o) => o.timePreset === TimePreset.CUSTOM)
+  @IsISO8601()
+  customTimeEnd: string;
+}

src/reports/dto/top-artists-report.dto.ts

@@ -0,0 +1,8 @@
+import { Artist } from "../../music-library/artist.entity";
+
+export class TopArtistsReportDto {
+  items: {
+    artist: Artist;
+    count: number;
+  }[];
+}