[#94] Backend

https://project.mdnd-it.cc/work_packages/94

SerpentRace_Backend/src/Application/Contact/queries/GetContactByIdQuery.ts

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+export interface GetContactByIdQuery {
+  id: string;
+}

SerpentRace_Backend/src/Application/Contact/queries/GetContactByIdQueryHandler.ts

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+import { IContactRepository } from '../../../Domain/IRepository/IContactRepository';
+import { GetContactByIdQuery } from './GetContactByIdQuery';
+import { DetailContactDto } from '../../DTOs/ContactDto';
+import { ContactMapper } from '../../DTOs/Mappers/ContactMapper';
+
+export class GetContactByIdQueryHandler {
+  constructor(private readonly contactRepo: IContactRepository) {}
+
+  async execute(query: GetContactByIdQuery): Promise<DetailContactDto | null> {
+    const contact = await this.contactRepo.findById(query.id);
+    if (!contact) {
+      return null;
+    }
+    return ContactMapper.toDetailDto(contact);
+  }
+}

SerpentRace_Backend/src/Application/Contact/queries/GetContactsByPageQuery.ts

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+export interface GetContactsByPageQuery {
+  from: number;
+  to: number;
+}

SerpentRace_Backend/src/Application/Contact/queries/GetContactsByPageQueryHandler.ts

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+import { IContactRepository } from '../../../Domain/IRepository/IContactRepository';
+import { GetContactsByPageQuery } from './GetContactsByPageQuery';
+import { ContactPageDto } from '../../DTOs/ContactDto';
+import { ContactMapper } from '../../DTOs/Mappers/ContactMapper';
+
+export class GetContactsByPageQueryHandler {
+  constructor(private readonly contactRepo: IContactRepository) {}
+
+  async execute(query: GetContactsByPageQuery): Promise<ContactPageDto> {
+    const result = await this.contactRepo.findByPage(query.from, query.to);
+    return {
+      contacts: ContactMapper.toShortDtoList(result.contacts),
+      totalCount: result.totalCount,
+      from: query.from,
+      to: query.to,
+    };
+  }
+}