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import { Title } from '@angular/platform-browser';
import { ActivatedRouteSnapshot, RouterStateSnapshot, TitleStrategy } from '@angular/router';
import { LoggerService } from '@drevo-web/core';
const DEFAULT_TITLE = 'Древо';
const TITLE_SUFFIX = ' - Древо';
const MAX_TITLE_LENGTH = 50;
export interface TitleContext {
readonly articleId: number;
readonly title: string;
}
@Injectable()
export class PageTitleStrategy extends TitleStrategy {
private readonly title = inject(Title);
private readonly logger = inject(LoggerService).withContext('PageTitleStrategy');
private readonly _pageTitle = signal(DEFAULT_TITLE);
readonly pageTitle = this._pageTitle.asReadonly();
private readonly _titleContext = signal<TitleContext | undefined>(undefined);
readonly titleContext = this._titleContext.asReadonly();
override updateTitle(snapshot: RouterStateSnapshot): void {
const resolved = this.resolveTitle(snapshot);
if (resolved) {
this._pageTitle.set(resolved.title);
const truncated = this.truncateTitle(resolved.title);
const titlePrefix = resolved.route.data['titlePrefix'] as string | undefined;
const docTitle = titlePrefix ? `${titlePrefix} ${truncated}` : truncated;
this.title.setTitle(`${docTitle}${TITLE_SUFFIX}`);
const titleSource = resolved.route.data['titleSource'] as string | undefined;
if (titleSource === 'article') {
const articleData = resolved.route.data['article'];
if (this.isTitleContext(articleData)) {
this._titleContext.set({ articleId: articleData.articleId, title: articleData.title });
} else {
// articleData === undefined is a normal failure path from articleResolver
// (bad id, 404, network error) — don't warn on it.
Eif (articleData !== undefined) {
this.logger.warn('Article route data does not match TitleContext shape', { articleData });
}
this._titleContext.set(undefined);
}
} else {
this._titleContext.set(undefined);
}
} else {
this._pageTitle.set(DEFAULT_TITLE);
this.title.setTitle(DEFAULT_TITLE);
this._titleContext.set(undefined);
}
this.logger.debug('Title updated', { title: resolved?.title ?? DEFAULT_TITLE });
}
private isTitleContext(value: unknown): value is TitleContext {
return (
typeof value === 'object' &&
!!value &&
typeof (value as TitleContext).articleId === 'number' &&
typeof (value as TitleContext).title === 'string'
);
}
updateArticleTitle(newTitle: string): void {
this._pageTitle.set(newTitle);
const ctx = this._titleContext();
Eif (ctx) {
this._titleContext.set({ ...ctx, title: newTitle });
}
const truncated = this.truncateTitle(newTitle);
this.title.setTitle(`${truncated}${TITLE_SUFFIX}`);
}
/**
* Resolve page title and the route it came from.
* First tries standard `buildTitle()` (explicit `title` on the route).
* If no explicit title, searches route chain for `titleSource` data key
* and reads title from the resolved data object (e.g. `data['article'].title`).
*/
private resolveTitle(
snapshot: RouterStateSnapshot,
): { readonly title: string; readonly route: ActivatedRouteSnapshot } | undefined {
const builtTitle = this.buildTitle(snapshot);
if (builtTitle) {
const chain = this.getRouteChain(snapshot);
return { title: builtTitle, route: chain[chain.length - 1] };
}
const result = this.findRouteData(snapshot, 'titleSource');
if (result) {
const resolved = result.route.data[result.value as string] as { readonly title: string } | undefined;
if (resolved?.title) {
return { title: resolved.title, route: result.route };
}
}
return undefined;
}
private truncateTitle(title: string): string {
if (title.length <= MAX_TITLE_LENGTH) {
return title;
}
return title.slice(0, MAX_TITLE_LENGTH) + '…';
}
/**
* Search for a data key from leaf route up to root.
* Returns the value and the route where it was found.
*/
private findRouteData(
snapshot: RouterStateSnapshot,
key: string,
): { readonly value: unknown; readonly route: ActivatedRouteSnapshot } | undefined {
const chain = this.getRouteChain(snapshot);
for (let i = chain.length - 1; i >= 0; i--) {
const value = chain[i].data[key];
if (value !== undefined) {
return { value, route: chain[i] };
}
}
return undefined;
}
private getRouteChain(snapshot: RouterStateSnapshot): ActivatedRouteSnapshot[] {
const chain: ActivatedRouteSnapshot[] = [];
Iif (!snapshot.root) return chain;
let route: ActivatedRouteSnapshot = snapshot.root;
chain.push(route);
while (route.firstChild) {
route = route.firstChild;
chain.push(route);
}
return chain;
}
}
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