'use strict';

const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');
const test = require('node:test');
const { JSDOM } = require('jsdom');
const ts = require('typescript');

const source = fs.readFileSync(path.join(__dirname, '../src/editor-runtime.ts'), 'utf8');
const compiled = ts.transpileModule(source, {
  compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
}).outputText;
const runtime = {};
new Function('exports', compiled)(runtime);
const { removeAdjacentBlock } = runtime;
const serializeSource = fs.readFileSync(path.join(__dirname, '../src/utils/serialize.ts'), 'utf8');
const serializeCompiled = ts.transpileModule(serializeSource, {
  compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
}).outputText;
const serializer = {};
new Function('exports', serializeCompiled)(serializer);

function fixture(html, nodeSelector, offset = 0) {
  const dom = new JSDOM(`<!doctype html><body contenteditable="true">${html}</body>`);
  const body = dom.window.document.body;
  const node = nodeSelector === 'body' ? body : body.querySelector(nodeSelector);
  let range = dom.window.document.createRange();
  range.setStart(node, offset);
  range.collapse(true);
  const events = [];
  const editor = {
    getBody: () => body,
    selection: {
      isCollapsed: () => range.collapsed,
      getRng: () => range,
      setRng: (next) => { range = next; },
      setCursorLocation: (target, at) => {
        range = dom.window.document.createRange();
        range.setStart(target, at);
        range.collapse(true);
      },
    },
    dom: { remove: (target) => target.remove() },
    undoManager: { transact: (action) => { events.push('undo'); action(); } },
    nodeChanged: () => events.push('node'),
    fire: (name) => events.push(name),
  };
  const press = (key, options = {}) => {
    const event = {
      key,
      prevented: false,
      preventDefault() { this.prevented = true; },
      ...options,
    };
    removeAdjacentBlock(editor, event);
    return event;
  };
  return { body, editor, events, press };
}

test('Backspace deletes the adjacent table from a paragraph boundary and records one edit', () => {
  const f = fixture('<table><tbody><tr><td>data</td></tr></tbody></table><p><strong>after</strong></p>', 'strong', 0);
  const event = f.press('Backspace');
  assert.equal(event.prevented, true);
  assert.equal(f.body.innerHTML, '<p><strong>after</strong></p>');
  assert.deepEqual(f.events, ['undo', 'node', 'change']);
});

test('Delete removes a following list only at the end of ordinary text', () => {
  const f = fixture('<p>before</p><ul><li>item</li></ul>', 'p', 0);
  f.editor.selection.setCursorLocation(f.body.querySelector('p').firstChild, 1);
  assert.equal(f.press('Delete').prevented, false);
  assert.equal(f.body.querySelectorAll('ul').length, 1);
  f.editor.selection.setCursorLocation(f.body.querySelector('p').firstChild, 6);
  assert.equal(f.press('Delete').prevented, true);
  assert.equal(f.body.innerHTML, '<p>before</p>');
});

test('a displayed formula is removed with its paragraph wrapper', () => {
  const f = fixture('<p><span class="jio-math jio-math--block" contenteditable="false">x</span><br data-mce-bogus="1"></p><p>next</p>', 'p', 1);
  assert.equal(f.press('Backspace').prevented, true);
  assert.equal(f.body.innerHTML, '<p>next</p>');
  assert.equal(f.editor.selection.getRng().startContainer, f.body.querySelector('p'));
});

test('Delete before a displayed formula removes only its paragraph', () => {
  const f = fixture('<p>before</p><p><span class="jio-math jio-math--block" contenteditable="false">x</span></p>', 'p:nth-child(2)', 0);
  assert.equal(f.press('Delete').prevented, true);
  assert.equal(f.body.innerHTML, '<p>before</p>');
});

test('Backspace on the line after a formula removes the empty line first', () => {
  const f = fixture('<p><span class="jio-math jio-math--block" contenteditable="false">x</span></p><p><br data-mce-bogus="1"></p>', 'p:nth-child(2)', 0);
  assert.equal(f.press('Backspace').prevented, true);
  assert.equal(f.body.querySelectorAll('.jio-math--block').length, 1);
  assert.equal(f.body.children.length, 1);
  assert.equal(f.editor.selection.getRng().startContainer, f.body);
  assert.equal(f.press('Backspace').prevented, true);
  assert.equal(f.body.querySelectorAll('.jio-math--block').length, 0);
  assert.equal(f.body.firstElementChild.tagName, 'P');
});

test('Backspace on an empty line after a table preserves the table', () => {
  const f = fixture('<table><tbody><tr><td>data</td></tr></tbody></table><p><br></p>', 'p', 0);
  assert.equal(f.press('Backspace').prevented, true);
  assert.equal(f.body.querySelectorAll('table').length, 1);
  assert.equal(f.body.querySelectorAll('p').length, 0);
});

test('a saved display formula restores as one paragraph without phantom lines', () => {
  const dom = new JSDOM('<!doctype html><body></body>');
  const previousDocument = global.document;
  global.document = dom.window.document;
  try {
    const saved = serializer.serializeBlocks('<p><span class="jio-math jio-math--block" data-jio-math-source="x^2" data-jio-math-display="1" contenteditable="false">x<sup>2</sup></span></p>');
    dom.window.document.body.innerHTML = serializer.hydrateBlocks(saved);
    assert.equal(dom.window.document.body.querySelectorAll('p').length, 1);
    assert.equal(dom.window.document.body.querySelectorAll('.jio-math--block').length, 1);
  } finally {
    global.document = previousDocument;
  }
});

test('a real line break inside a paragraph is not a block boundary', () => {
  const f = fixture('<hr><p><br>text</p>', 'p', 1);
  assert.equal(f.press('Backspace').prevented, false);
  assert.equal(f.body.querySelectorAll('hr').length, 1);
});

test('nested quote and hidden-content editing boundaries remove the whole outer block', () => {
  for (const html of [
    '<div class="quote_q" contenteditable="false"><div contenteditable="true"><p>quote</p></div></div>',
    '<div class="tinymce-hide"><p class="hide-before">[vip]</p><div contenteditable="true"><p>secret</p></div><p class="hide-after">[/vip]</p></div>',
  ]) {
    const f = fixture(`${html}<p>next</p>`, '[contenteditable="true"] p', 0);
    assert.equal(f.press('Backspace').prevented, true);
    assert.equal(f.body.innerHTML, '<p>next</p>');
  }
});

test('deleting the last structure creates an editable caret home without resetting content', () => {
  const f = fixture('<pre>code</pre>', 'pre', 0);
  assert.equal(f.press('Backspace').prevented, true);
  assert.equal(f.body.children.length, 1);
  assert.equal(f.body.firstElementChild.tagName, 'P');
  assert.equal(f.editor.selection.getRng().startContainer, f.body.firstElementChild);
});

test('body-level caret can delete an adjacent divider', () => {
  const f = fixture('<hr><p>after</p>', 'body', 1);
  assert.equal(f.press('Backspace').prevented, true);
  assert.equal(f.body.innerHTML, '<p>after</p>');
});

test('body-level deletion of the only divider leaves a caret home', () => {
  const f = fixture('<hr>', 'body', 1);
  assert.equal(f.press('Backspace').prevented, true);
  assert.equal(f.body.firstElementChild.tagName, 'P');
  assert.equal(f.editor.selection.getRng().startContainer, f.body.firstElementChild);
});

test('body-level deletion places the caret before the next structural block', () => {
  const f = fixture('<hr><pre>code</pre>', 'body', 1);
  assert.equal(f.press('Backspace').prevented, true);
  assert.equal(f.body.firstElementChild.tagName, 'P');
  assert.equal(f.body.lastElementChild.tagName, 'PRE');
  assert.equal(f.editor.selection.getRng().startContainer, f.body.firstElementChild);
});

test('media-only paragraphs are removed with their media', () => {
  const f = fixture('<p><img src="example.jpg"><br data-mce-bogus="1"></p><p>next</p>', 'p', 1);
  assert.equal(f.press('Backspace').prevented, true);
  assert.equal(f.body.innerHTML, '<p>next</p>');
});

test('editing inside a table or list keeps the native key behavior', () => {
  for (const html of [
    '<table><tbody><tr><td>cell</td></tr></tbody></table>',
    '<ul><li>item</li></ul>',
  ]) {
    const f = fixture(html, html.startsWith('<table>') ? 'td' : 'li', 0);
    assert.equal(f.press('Backspace').prevented, false);
    assert.equal(f.body.firstElementChild.outerHTML, html);
  }
});

test('selection and modified keys are left to native editing', () => {
  const f = fixture('<hr><p>after</p>', 'p', 0);
  assert.equal(f.press('Backspace', { ctrlKey: true }).prevented, false);
  assert.equal(f.press('Backspace', { isComposing: true }).prevented, false);
  const range = f.editor.selection.getRng();
  range.selectNodeContents(f.body.querySelector('p'));
  assert.equal(f.press('Backspace').prevented, false);
  assert.equal(f.body.querySelectorAll('hr').length, 1);
  assert.deepEqual(f.events, []);
});