import type { BookStackAccount } from './bookstack.classes.account.js';
import type {
  IBookStackChapter,
  IBookStackPage,
  IBookStackTag,
  IBookStackListParams,
  IBookStackListResponse,
  TBookStackExportFormat,
} from './bookstack.interfaces.js';
import { BookStackPage } from './bookstack.classes.page.js';
import { autoPaginate } from './bookstack.helpers.js';

export class BookStackChapter {
  public readonly id: number;
  public readonly bookId: number;
  public readonly name: string;
  public readonly slug: string;
  public readonly description: string;
  public readonly priority: number;
  public readonly createdAt: string;
  public readonly updatedAt: string;
  public readonly createdBy: number;
  public readonly updatedBy: number;
  public readonly ownedBy: number;
  public readonly tags: IBookStackTag[];

  /** @internal */
  constructor(
    private accountRef: BookStackAccount,
    raw: IBookStackChapter,
  ) {
    this.id = raw.id;
    this.bookId = raw.book_id;
    this.name = raw.name || '';
    this.slug = raw.slug || '';
    this.description = raw.description || '';
    this.priority = raw.priority || 0;
    this.createdAt = raw.created_at || '';
    this.updatedAt = raw.updated_at || '';
    this.createdBy = raw.created_by;
    this.updatedBy = raw.updated_by;
    this.ownedBy = raw.owned_by;
    this.tags = raw.tags || [];
  }

  // ---------------------------------------------------------------------------
  // CRUD
  // ---------------------------------------------------------------------------

  async update(data: {
    name?: string;
    description?: string;
    description_html?: string;
    book_id?: number;
    tags?: IBookStackTag[];
    priority?: number;
    default_template_id?: number | null;
  }): Promise<BookStackChapter> {
    const raw = await this.accountRef.request<IBookStackChapter>('PUT', `/chapters/${this.id}`, data);
    return new BookStackChapter(this.accountRef, raw);
  }

  async delete(): Promise<void> {
    await this.accountRef.request('DELETE', `/chapters/${this.id}`);
  }

  // ---------------------------------------------------------------------------
  // Export
  // ---------------------------------------------------------------------------

  async export(format: TBookStackExportFormat): Promise<string | Uint8Array> {
    if (format === 'pdf') {
      return this.accountRef.requestBinary(`/chapters/${this.id}/export/${format}`);
    }
    return this.accountRef.requestText('GET', `/chapters/${this.id}/export/${format}`);
  }

  // ---------------------------------------------------------------------------
  // Navigation — Pages
  // ---------------------------------------------------------------------------

  async getPages(opts?: IBookStackListParams): Promise<BookStackPage[]> {
    return autoPaginate(
      (offset, count) =>
        this.accountRef.request<IBookStackListResponse<IBookStackPage>>(
          'GET',
          this.accountRef.buildListUrl(`/pages`, { ...opts, offset, count, filter: { ...opts?.filter, chapter_id: String(this.id) } }),
        ),
      opts,
    ).then((pages) => pages.map((p) => new BookStackPage(this.accountRef, p)));
  }

  async createPage(data: {
    name: string;
    html?: string;
    markdown?: string;
    tags?: IBookStackTag[];
    priority?: number;
  }): Promise<BookStackPage> {
    const raw = await this.accountRef.request<IBookStackPage>('POST', '/pages', {
      chapter_id: this.id,
      ...data,
    });
    return new BookStackPage(this.accountRef, raw);
  }

  // ---------------------------------------------------------------------------
  // Serialization
  // ---------------------------------------------------------------------------

  toJSON(): IBookStackChapter {
    return {
      id: this.id,
      book_id: this.bookId,
      name: this.name,
      slug: this.slug,
      description: this.description,
      priority: this.priority,
      created_at: this.createdAt,
      updated_at: this.updatedAt,
      created_by: this.createdBy,
      updated_by: this.updatedBy,
      owned_by: this.ownedBy,
      tags: this.tags,
    };
  }
}