/**
 * Task 3 - document-folders service: listTree + createFolder (TDD).
 * Task 4 - renameFolder + moveFolder (TDD).
 *
 * Uses the makePort factory (not a "setupTestPort" helper - that name
 * doesn't exist in this codebase). TEST_USER_ID is resolved once via
 * beforeAll from any seeded user, matching the pattern in
 * alerts-tenant-isolation.test.ts and gdpr-export.test.ts.
 */

import { describe, it, expect, beforeAll, beforeEach } from 'vitest';

import { eq } from 'drizzle-orm';

import { db } from '@/lib/db';
import { documentFolders } from '@/lib/db/schema/documents';
import { user } from '@/lib/db/schema/users';
import {
  listTree,
  createFolder,
  renameFolder,
  moveFolder,
} from '@/lib/services/document-folders.service';
import { makePort } from '../helpers/factories';

let TEST_USER_ID = '';

beforeAll(async () => {
  const [u] = await db.select({ id: user.id }).from(user).limit(1);
  if (!u) throw new Error('No user available; run pnpm db:seed first');
  TEST_USER_ID = u.id;
});

describe('document-folders service · listTree', () => {
  let portId: string;

  beforeEach(async () => {
    const port = await makePort();
    portId = port.id;
    await db.delete(documentFolders).where(eq(documentFolders.portId, portId));
  });

  it('returns an empty array when no folders exist', async () => {
    const tree = await listTree(portId);
    expect(tree).toEqual([]);
  });

  it('returns root folders with children nested under them', async () => {
    const root = await createFolder(portId, TEST_USER_ID, { name: 'Deals 2026', parentId: null });
    const child = await createFolder(portId, TEST_USER_ID, {
      name: 'Q1',
      parentId: root.id,
    });
    const tree = await listTree(portId);
    expect(tree).toHaveLength(1);
    expect(tree[0]?.id).toBe(root.id);
    expect(tree[0]?.children).toHaveLength(1);
    expect(tree[0]?.children[0]?.id).toBe(child.id);
  });

  it('only returns folders for the requested port', async () => {
    const otherPort = await makePort();
    await createFolder(otherPort.id, TEST_USER_ID, { name: 'Other Port', parentId: null });
    const tree = await listTree(portId);
    expect(tree).toEqual([]);
  });
});

describe('document-folders service · createFolder unique-sibling guard', () => {
  let portId: string;

  beforeEach(async () => {
    const port = await makePort();
    portId = port.id;
    await db.delete(documentFolders).where(eq(documentFolders.portId, portId));
  });

  it('rejects a duplicate sibling name (case-insensitive)', async () => {
    await createFolder(portId, TEST_USER_ID, { name: 'Deals 2026', parentId: null });
    await expect(
      createFolder(portId, TEST_USER_ID, { name: 'deals 2026', parentId: null }),
    ).rejects.toThrow(/already exists/i);
  });

  it('allows the same name under different parents', async () => {
    const a = await createFolder(portId, TEST_USER_ID, { name: 'A', parentId: null });
    const b = await createFolder(portId, TEST_USER_ID, { name: 'B', parentId: null });
    await createFolder(portId, TEST_USER_ID, { name: 'Drafts', parentId: a.id });
    await expect(
      createFolder(portId, TEST_USER_ID, { name: 'Drafts', parentId: b.id }),
    ).resolves.toBeDefined();
  });

  it('rejects a parentId from another port', async () => {
    const otherPort = await makePort();
    const otherFolder = await createFolder(otherPort.id, TEST_USER_ID, {
      name: 'Other',
      parentId: null,
    });
    await expect(
      createFolder(portId, TEST_USER_ID, { name: 'Should fail', parentId: otherFolder.id }),
    ).rejects.toThrow(/invalid parent/i);
  });
});

describe('document-folders service · renameFolder', () => {
  let portId: string;

  beforeEach(async () => {
    const port = await makePort();
    portId = port.id;
    await db.delete(documentFolders).where(eq(documentFolders.portId, portId));
  });

  it('renames a folder and bumps updatedAt', async () => {
    const folder = await createFolder(portId, TEST_USER_ID, { name: 'Old', parentId: null });
    const before = folder.updatedAt.getTime();
    await new Promise((r) => setTimeout(r, 10));
    const renamed = await renameFolder(portId, folder.id, 'New', TEST_USER_ID);
    expect(renamed.name).toBe('New');
    expect(renamed.updatedAt.getTime()).toBeGreaterThan(before);
  });

  it('rejects rename to an existing sibling name', async () => {
    await createFolder(portId, TEST_USER_ID, { name: 'Existing', parentId: null });
    const folder = await createFolder(portId, TEST_USER_ID, { name: 'Mine', parentId: null });
    await expect(renameFolder(portId, folder.id, 'Existing', TEST_USER_ID)).rejects.toThrow(
      /already exists/i,
    );
  });

  it('throws NotFound when the folder belongs to another port', async () => {
    const otherPort = await makePort();
    const folder = await createFolder(otherPort.id, TEST_USER_ID, { name: 'X', parentId: null });
    await expect(renameFolder(portId, folder.id, 'Y', TEST_USER_ID)).rejects.toThrow(
      /couldn't find/i,
    );
  });
});

describe('document-folders service · moveFolder', () => {
  let portId: string;

  beforeEach(async () => {
    const port = await makePort();
    portId = port.id;
    await db.delete(documentFolders).where(eq(documentFolders.portId, portId));
  });

  it('moves a folder under a new parent', async () => {
    const root = await createFolder(portId, TEST_USER_ID, { name: 'Root', parentId: null });
    const orphan = await createFolder(portId, TEST_USER_ID, { name: 'Orphan', parentId: null });
    const moved = await moveFolder(portId, orphan.id, root.id, TEST_USER_ID);
    expect(moved.parentId).toBe(root.id);
  });

  it('moves a folder back to root with parentId=null', async () => {
    const root = await createFolder(portId, TEST_USER_ID, { name: 'Root', parentId: null });
    const child = await createFolder(portId, TEST_USER_ID, { name: 'Child', parentId: root.id });
    const moved = await moveFolder(portId, child.id, null, TEST_USER_ID);
    expect(moved.parentId).toBeNull();
  });

  it('rejects a move that would create a cycle', async () => {
    const a = await createFolder(portId, TEST_USER_ID, { name: 'A', parentId: null });
    const b = await createFolder(portId, TEST_USER_ID, { name: 'B', parentId: a.id });
    const c = await createFolder(portId, TEST_USER_ID, { name: 'C', parentId: b.id });
    // moving A under C would create A → B → C → A
    await expect(moveFolder(portId, a.id, c.id, TEST_USER_ID)).rejects.toThrow(/cycle/i);
  });

  it('rejects moving a folder under itself', async () => {
    const a = await createFolder(portId, TEST_USER_ID, { name: 'A', parentId: null });
    await expect(moveFolder(portId, a.id, a.id, TEST_USER_ID)).rejects.toThrow(/cycle/i);
  });
});