import { tap, expect } from '@push.rocks/tapbundle';
import * as lik from '../ts/index.js';

class TestClass {
  constructor(public hey: string) {
    // nothing here
  }
}

let testTree = new lik.Tree<TestClass>();

let testInstance = new TestClass('first');
let testInstance2 = new TestClass('second');
let testInstance3 = new TestClass('third');
let testInstance4 = new TestClass('fourth');
let testInstance5 = new TestClass('fifth');
let testInstance6 = new TestClass('sixth');

tap.test('create a valid tree instance', async () => {
  testTree = new lik.Tree();
  expect(testTree).toBeInstanceOf(lik.Tree);
});

tap.test('should insert an object', async () => {
  testTree.initialize(testInstance);
  let resultArray = testTree.treeToArray(testInstance, {});
  expect(resultArray).toContain(testInstance);
});

tap.test('should add other objects in a hierachy', async () => {
  testTree.appendChild(testInstance, testInstance2);
  testTree.appendChild(testInstance, testInstance3);
  testTree.appendChild(testInstance, testInstance4);
});

tap.test('hasChildren returns correct value', async () => {
  expect(testTree.hasChildren(testInstance)).toBeTrue();
  expect(testTree.hasChildren(testInstance2)).toBeFalse();
});

tap.test('firstChild and lastChild work', async () => {
  const first = testTree.firstChild(testInstance);
  expect(first.hey).toEqual('second');
  const last = testTree.lastChild(testInstance);
  expect(last.hey).toEqual('fourth');
});

tap.test('parent returns correct parent', async () => {
  const parent = testTree.parent(testInstance2);
  expect(parent.hey).toEqual('first');
});

tap.test('nextSibling and previousSibling work', async () => {
  const next = testTree.nextSibling(testInstance2);
  expect(next.hey).toEqual('third');
  const prev = testTree.previousSibling(testInstance3);
  expect(prev.hey).toEqual('second');
});

tap.test('childrenCount returns correct count', async () => {
  expect(testTree.childrenCount(testInstance)).toEqual(3);
  expect(testTree.childrenCount(testInstance2)).toEqual(0);
});

tap.test('index returns sibling index', async () => {
  expect(testTree.index(testInstance2)).toEqual(0);
  expect(testTree.index(testInstance3)).toEqual(1);
  expect(testTree.index(testInstance4)).toEqual(2);
});

tap.test('childrenToArray returns children', async () => {
  const children = testTree.childrenToArray(testInstance, {});
  expect(children.length).toEqual(3);
  expect(children[0].hey).toEqual('second');
});

tap.test('insertBefore works', async () => {
  testTree.initialize(testInstance5);
  testTree.insertBefore(testInstance3, testInstance5);
  const idx = testTree.index(testInstance5);
  expect(idx).toEqual(1);
  expect(testTree.nextSibling(testInstance5).hey).toEqual('third');
});

tap.test('insertAfter works', async () => {
  testTree.initialize(testInstance6);
  testTree.insertAfter(testInstance3, testInstance6);
  expect(testTree.previousSibling(testInstance6).hey).toEqual('third');
});

tap.test('remove detaches node', async () => {
  const countBefore = testTree.childrenCount(testInstance);
  testTree.remove(testInstance6);
  expect(testTree.childrenCount(testInstance)).toEqual(countBefore - 1);
});

tap.test('treeIterator with options works', async () => {
  const items: TestClass[] = [];
  for (const item of testTree.treeIterator(testInstance, {})) {
    items.push(item);
  }
  expect(items.length).toBeGreaterThan(1);
  expect(items[0].hey).toEqual('first');
});

tap.test('nextSiblingsIterator works (bug was fixed)', async () => {
  const siblings: TestClass[] = [];
  for (const item of testTree.nextSiblingsIterator(testInstance2)) {
    siblings.push(item);
  }
  expect(siblings.length).toBeGreaterThan(0);
});

tap.test('ancestorsIterator works (bug was fixed)', async () => {
  const ancestors: TestClass[] = [];
  for (const item of testTree.ancestorsIterator(testInstance2)) {
    ancestors.push(item);
  }
  expect(ancestors.length).toBeGreaterThan(0);
});

tap.test("should create a JSON object that reflects a tree's hierachy", async () => {
  const jsonTree = testTree.toJsonWithHierachy(testInstance);
  expect(jsonTree).toHaveProperty('data');
  expect(jsonTree).toHaveProperty('children');
  expect(jsonTree.data.hey).toEqual('first');
  expect(jsonTree.children.length).toBeGreaterThan(0);
});

tap.test('fromJsonWithHierachy rebuilds a tree', async () => {
  const newTree = new lik.Tree<{ name: string }>();
  const jsonRoot = {
    data: { name: 'root' },
    children: [
      { data: { name: 'child1' }, children: [] },
      {
        data: { name: 'child2' },
        children: [{ data: { name: 'grandchild' }, children: [] }],
      },
    ],
  };
  const root = newTree.fromJsonWithHierachy(jsonRoot);
  expect(root.name).toEqual('root');
  expect(newTree.hasChildren(root)).toBeTrue();
  expect(newTree.childrenCount(root)).toEqual(2);
  const children = newTree.childrenToArray(root, {});
  expect(children[1].name).toEqual('child2');
  expect(newTree.hasChildren(children[1])).toBeTrue();
});

export default tap.start();