/**
 * Project Folders API Tests - CRUD for project folders + move project to folder
 */
import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import type { FastifyInstance } from 'fastify';
import { SqliteAdapter } from '../src/database/SqliteAdapter.js';
import { createServer } from '../src/server.js';

describe('Project Folders API', () => {
  let app: FastifyInstance;
  let db: SqliteAdapter;
  let authToken: string;
  let createdFolderId: string;
  let childFolderId: string;
  let createdProjectId: string;

  beforeAll(async () => {
    db = new SqliteAdapter(':memory:');
    await db.init();
    app = await createServer({ db, port: 0 });
    await app.ready();

    const regRes = await app.inject({
      method: 'POST',
      url: '/api/auth/register',
      payload: { email: 'folder-test@example.com', password: 'Password123!', name: 'Folder Test' },
    });
    const regBody = JSON.parse(regRes.body);
    authToken = regBody.session.token;
  });

  afterAll(async () => {
    await app.close();
    db.close();
  });

  it('should list empty folders initially', async () => {
    const res = await app.inject({
      method: 'GET',
      url: '/api/project-folders',
      headers: { authorization: `Bearer ${authToken}` },
    });
    expect(res.statusCode).toBe(200);
    const body = JSON.parse(res.body);
    expect(Array.isArray(body)).toBe(true);
    expect(body.length).toBe(0);
  });

  it('should create a folder', async () => {
    const res = await app.inject({
      method: 'POST',
      url: '/api/project-folders',
      headers: { authorization: `Bearer ${authToken}` },
      payload: { name: 'Test Folder' },
    });
    expect(res.statusCode).toBe(201);
    const body = JSON.parse(res.body);
    expect(body.name).toBe('Test Folder');
    expect(body.parent_id).toBeNull();
    expect(body.id).toBeDefined();
    createdFolderId = body.id;
  });

  it('should create a child folder', async () => {
    const res = await app.inject({
      method: 'POST',
      url: '/api/project-folders',
      headers: { authorization: `Bearer ${authToken}` },
      payload: { name: 'Child Folder', parent_id: createdFolderId },
    });
    expect(res.statusCode).toBe(201);
    const body = JSON.parse(res.body);
    expect(body.name).toBe('Child Folder');
    expect(body.parent_id).toBe(createdFolderId);
    childFolderId = body.id;
  });

  it('should list folders including the created ones', async () => {
    const res = await app.inject({
      method: 'GET',
      url: '/api/project-folders',
      headers: { authorization: `Bearer ${authToken}` },
    });
    expect(res.statusCode).toBe(200);
    const body = JSON.parse(res.body);
    expect(body.length).toBe(2);
    expect(body.some((f: { id: string }) => f.id === createdFolderId)).toBe(true);
    expect(body.some((f: { id: string }) => f.id === childFolderId)).toBe(true);
  });

  it('should get a single folder', async () => {
    const res = await app.inject({
      method: 'GET',
      url: `/api/project-folders/${createdFolderId}`,
      headers: { authorization: `Bearer ${authToken}` },
    });
    expect(res.statusCode).toBe(200);
    const body = JSON.parse(res.body);
    expect(body.id).toBe(createdFolderId);
    expect(body.name).toBe('Test Folder');
  });

  it('should rename a folder', async () => {
    const res = await app.inject({
      method: 'PUT',
      url: `/api/project-folders/${createdFolderId}`,
      headers: { authorization: `Bearer ${authToken}` },
      payload: { name: 'Renamed Folder' },
    });
    expect(res.statusCode).toBe(200);
    const body = JSON.parse(res.body);
    expect(body.name).toBe('Renamed Folder');
  });

  it('should reject folder creation without name', async () => {
    const res = await app.inject({
      method: 'POST',
      url: '/api/project-folders',
      headers: { authorization: `Bearer ${authToken}` },
      payload: {},
    });
    expect(res.statusCode).toBe(400);
  });

  it('should reject rename without name', async () => {
    const res = await app.inject({
      method: 'PUT',
      url: `/api/project-folders/${createdFolderId}`,
      headers: { authorization: `Bearer ${authToken}` },
      payload: {},
    });
    expect(res.statusCode).toBe(400);
  });

  it('should reject operations on non-existent folder', async () => {
    const getRes = await app.inject({
      method: 'GET',
      url: '/api/project-folders/nonexistent-folder',
      headers: { authorization: `Bearer ${authToken}` },
    });
    expect(getRes.statusCode).toBe(404);

    const delRes = await app.inject({
      method: 'DELETE',
      url: '/api/project-folders/nonexistent-folder',
      headers: { authorization: `Bearer ${authToken}` },
    });
    expect(delRes.statusCode).toBe(404);
  });

  it('should reject unauthenticated requests', async () => {
    const res = await app.inject({
      method: 'GET',
      url: '/api/project-folders',
    });
    expect(res.statusCode).toBe(401);
  });

  // ─── Project + Folder integration ────────────────────

  it('should create a project with folder_id', async () => {
    const res = await app.inject({
      method: 'POST',
      url: '/api/projects',
      headers: { authorization: `Bearer ${authToken}` },
      payload: { name: 'Folder Project', folder_id: createdFolderId },
    });
    expect(res.statusCode).toBe(201);
    const body = JSON.parse(res.body);
    expect(body.name).toBe('Folder Project');
    expect(body.folder_id).toBe(createdFolderId);
    createdProjectId = body.id;
  });

  it('should list projects filtered by folder', async () => {
    const res = await app.inject({
      method: 'GET',
      url: `/api/projects?folderId=${createdFolderId}`,
      headers: { authorization: `Bearer ${authToken}` },
    });
    expect(res.statusCode).toBe(200);
    const body = JSON.parse(res.body);
    expect(body.length).toBe(1);
    expect(body[0].id).toBe(createdProjectId);
  });

  it('should list unfoldered projects with folderId=null', async () => {
    // First create a project without folder
    await app.inject({
      method: 'POST',
      url: '/api/projects',
      headers: { authorization: `Bearer ${authToken}` },
      payload: { name: 'No Folder Project' },
    });

    const res = await app.inject({
      method: 'GET',
      url: '/api/projects?folderId=null',
      headers: { authorization: `Bearer ${authToken}` },
    });
    expect(res.statusCode).toBe(200);
    const body = JSON.parse(res.body);
    expect(body.every((p: { folder_id: string | null }) => p.folder_id === null)).toBe(true);
  });

  it('should move project to a different folder', async () => {
    const res = await app.inject({
      method: 'PUT',
      url: `/api/projects/${createdProjectId}/folder`,
      headers: { authorization: `Bearer ${authToken}` },
      payload: { folder_id: childFolderId },
    });
    expect(res.statusCode).toBe(200);
    const body = JSON.parse(res.body);
    expect(body.folder_id).toBe(childFolderId);
  });

  it('should move project to root (folder_id = null)', async () => {
    const res = await app.inject({
      method: 'PUT',
      url: `/api/projects/${createdProjectId}/folder`,
      headers: { authorization: `Bearer ${authToken}` },
      payload: { folder_id: null },
    });
    expect(res.statusCode).toBe(200);
    const body = JSON.parse(res.body);
    expect(body.folder_id).toBeNull();
  });

  it('should reject moving project to non-existent folder', async () => {
    const res = await app.inject({
      method: 'PUT',
      url: `/api/projects/${createdProjectId}/folder`,
      headers: { authorization: `Bearer ${authToken}` },
      payload: { folder_id: 'nonexistent-folder' },
    });
    expect(res.statusCode).toBe(404);
  });

  it('should delete folder and move projects to root', async () => {
    // Move project back to folder first
    await app.inject({
      method: 'PUT',
      url: `/api/projects/${createdProjectId}/folder`,
      headers: { authorization: `Bearer ${authToken}` },
      payload: { folder_id: childFolderId },
    });

    // Delete the child folder
    const delRes = await app.inject({
      method: 'DELETE',
      url: `/api/project-folders/${childFolderId}`,
      headers: { authorization: `Bearer ${authToken}` },
    });
    expect(delRes.statusCode).toBe(204);

    // Verify project is now in root
    const projRes = await app.inject({
      method: 'GET',
      url: `/api/projects/${createdProjectId}`,
      headers: { authorization: `Bearer ${authToken}` },
    });
    expect(projRes.statusCode).toBe(200);
    const projBody = JSON.parse(projRes.body);
    expect(projBody.folder_id).toBeNull();
  });

  it('should delete remaining folders', async () => {
    const res = await app.inject({
      method: 'DELETE',
      url: `/api/project-folders/${createdFolderId}`,
      headers: { authorization: `Bearer ${authToken}` },
    });
    expect(res.statusCode).toBe(204);

    // Verify no folders left
    const listRes = await app.inject({
      method: 'GET',
      url: '/api/project-folders',
      headers: { authorization: `Bearer ${authToken}` },
    });
    const listBody = JSON.parse(listRes.body);
    expect(listBody.length).toBe(0);
  });
});