import { randomBytes } from 'node:crypto';
import type { JoplinAdapter, NoteQuery } from '../src/adapter/joplin-adapter.js';
import type { ChangePage, Note, Notebook, Pagination, RevisionRecord, Tag } from '../src/domain/types.js';

const id = () => randomBytes(16).toString('hex');

export class FakeAdapter implements JoplinAdapter {
  public notebooks: Notebook[] = [];
  public notes: Note[] = [];
  public tags: Tag[] = [];
  public revisions: RevisionRecord[] = [];
  public syncCalls = 0;
  public dataCalls = 0;
  public failSyncCalls = new Set<number>();
  public delayMs = 0;
  public concurrentCalls = 0;
  public maxConcurrentCalls = 0;

  public async prepare(): Promise<void> {}
  public async close(): Promise<void> {}

  public async sync(): Promise<void> {
    await this.track(async () => {
      this.syncCalls += 1;
      if (this.failSyncCalls.has(this.syncCalls)) throw new Error('sync offline');
    });
  }

  public async listNotebooks(): Promise<Notebook[]> {
    return this.data(() => structuredClone(this.notebooks));
  }

  public async getNotebook(notebookId: string): Promise<Notebook | null> {
    return this.data(() => structuredClone(this.notebooks.find(item => item.id === notebookId) ?? null));
  }

  public async createNotebook(input: { title: string; parent_id?: string }): Promise<Notebook> {
    return this.data(() => {
      const notebook: Notebook = { id: id(), parent_id: input.parent_id ?? '', title: input.title, created_time: Date.now(), updated_time: Date.now() };
      this.notebooks.push(notebook);
      return structuredClone(notebook);
    });
  }

  public async listNotes(query: NoteQuery): Promise<Note[]> {
    return this.data(() => structuredClone(this.notes.filter(note =>
      (query.parent_id === undefined || note.parent_id === query.parent_id) && (query.include_deleted || !note.deleted_time))));
  }

  public async getNote(noteId: string, includeDeleted = false): Promise<Note | null> {
    return this.data(() => {
      const note = this.notes.find(item => item.id === noteId && (includeDeleted || !item.deleted_time));
      return structuredClone(note ?? null);
    });
  }

  public async createNote(input: { parent_id: string; title: string; body: string }): Promise<Note> {
    return this.data(() => {
      const now = Date.now();
      const note: Note = { id: id(), ...input, created_time: now, updated_time: now, deleted_time: 0, is_todo: 0, is_conflict: 0 };
      this.notes.push(note);
      return structuredClone(note);
    });
  }

  public async updateNote(noteId: string, input: Partial<Pick<Note, 'parent_id' | 'title' | 'body' | 'deleted_time'>>): Promise<Note> {
    return this.data(() => {
      const note = this.notes.find(item => item.id === noteId);
      if (!note) throw new Error('not found');
      Object.assign(note, input, { updated_time: Date.now() });
      return structuredClone(note);
    });
  }

  public async deleteNote(noteId: string): Promise<void> {
    await this.data(() => {
      const note = this.notes.find(item => item.id === noteId);
      if (note) note.deleted_time = Date.now();
    });
  }

  public async listTags(): Promise<Tag[]> { return this.data(() => structuredClone(this.tags)); }
  public async getTag(tagId: string): Promise<Tag | null> { return this.data(() => structuredClone(this.tags.find(tag => tag.id === tagId) ?? null)); }
  public async createTag(input: { title: string }): Promise<Tag> {
    return this.data(() => {
      const tag = { id: id(), title: input.title };
      this.tags.push(tag);
      return structuredClone(tag);
    });
  }
  public async listNoteTags(): Promise<Tag[]> { return this.data(() => []); }
  public async listTagNotes(): Promise<Note[]> { return this.data(() => []); }
  public async addTagToNote(): Promise<void> { await this.data(() => undefined); }
  public async removeTagFromNote(): Promise<void> { await this.data(() => undefined); }
  public async search(_query: string, _pagination: Pagination): Promise<Note[]> { return this.data(() => structuredClone(this.notes)); }
  public async listRevisions(noteId: string): Promise<RevisionRecord[]> {
    return this.data(() => structuredClone(this.revisions.filter(revision => revision.item_id === noteId)));
  }
  public async listChanges(cursor: string | undefined): Promise<ChangePage> {
    return this.data(() => ({ items: [], cursor: cursor ?? '0', has_more: false }));
  }

  private async data<T>(operation: () => T): Promise<T> {
    this.dataCalls += 1;
    return this.track(operation);
  }

  private async track<T>(operation: () => T): Promise<T> {
    this.concurrentCalls += 1;
    this.maxConcurrentCalls = Math.max(this.maxConcurrentCalls, this.concurrentCalls);
    try {
      if (this.delayMs) await new Promise(resolve => setTimeout(resolve, this.delayMs));
      return operation();
    } finally {
      this.concurrentCalls -= 1;
    }
  }
}