import {
PageError,
PageNotFoundError,
ValidationError,
} from "../../../shared/validators";
import type {
CreatePageRequest,
CreatePageResponse,
PageRepository,
} from "../models";
import { PageId, PageTitle } from "../models";
import type { SpaceRepository } from "../../spaces/models";
import {
PageContextBuilder,
buildSimplifiedPageContext,
} from "../utils/context-builder";
/**
* Use case for creating a new page
*/
export class CreatePageUseCase {
private contextBuilder?: PageContextBuilder;
constructor(
private pageRepository: PageRepository,
spaceRepository?: SpaceRepository,
) {
// Only create context builder if both repositories are provided
if (spaceRepository) {
this.contextBuilder = new PageContextBuilder(
spaceRepository,
pageRepository,
);
}
}
async execute(request: CreatePageRequest): Promise<CreatePageResponse> {
try {
// Check if a page with the same title already exists in the space
const pageTitle = PageTitle.fromString(request.title);
const existingPage = await this.pageRepository.findByTitle(
request.spaceId,
pageTitle,
);
if (existingPage) {
throw new ValidationError(
`A page with title "${request.title}" already exists in this space`,
);
}
// Validate parent page exists if specified
if (request.parentPageId) {
const parentId = PageId.fromString(request.parentPageId);
const parentExists = await this.pageRepository.exists(parentId);
if (!parentExists) {
throw new PageNotFoundError(request.parentPageId);
}
}
const page = await this.pageRepository.create(request);
// Build context using full context builder if available, otherwise fallback to simplified
const context = this.contextBuilder
? await this.contextBuilder.buildContext(page)
: buildSimplifiedPageContext(page);
return {
page,
context,
message: `Page "${page.title.value}" created successfully`,
};
} catch (error) {
if (
error instanceof ValidationError ||
error instanceof PageNotFoundError
) {
throw error;
}
throw new PageError(
`Failed to create page: ${error instanceof Error ? error.message : "Unknown error"}`,
undefined,
error,
);
}
}
}
