import { test } from 'node:test';
import assert from 'node:assert/strict';
import { IContent } from 'matrix-js-sdk';
import { mergeScheduledBody } from './ScheduleMessageModal';

// [Gitea #36] Pure merge of the modal textarea back into the composer-built
// content: verbatim when unedited, body-only replacement (rich HTML dropped,
// mentions + relation kept) when edited.

const richContent: IContent = {
  msgtype: 'm.text',
  body: 'hello **bold** @alice',
  format: 'org.matrix.custom.html',
  formatted_body: 'hello <b>bold</b> <a href="https://matrix.to/#/@alice:x">alice</a>',
  'm.mentions': { user_ids: ['@alice:x'] },
  'm.relates_to': {
    'm.in_reply_to': { event_id: '$reply' },
    rel_type: 'm.thread',
    event_id: '$root',
    is_falling_back: false,
  },
};

test('mergeScheduledBody returns the content verbatim when the body is unedited', () => {
  assert.equal(mergeScheduledBody(richContent, richContent.body), richContent);
  // Whitespace-only differences (the textarea value is trimmed) still count as unedited.
  assert.equal(mergeScheduledBody(richContent, `  ${richContent.body}\n`), richContent);
});

test('mergeScheduledBody drops stale formatting but keeps mentions and relation on edit', () => {
  const merged = mergeScheduledBody(richContent, 'edited text ');
  assert.deepEqual(merged, {
    msgtype: 'm.text',
    body: 'edited text',
    'm.mentions': { user_ids: ['@alice:x'] },
    'm.relates_to': richContent['m.relates_to'],
  });
  assert.equal('format' in merged, false);
  assert.equal('formatted_body' in merged, false);
  // Input is not mutated.
  assert.equal(richContent.formatted_body !== undefined, true);
});

test('mergeScheduledBody builds a bare text content when opened blank', () => {
  assert.deepEqual(mergeScheduledBody(null, ' hi '), { body: 'hi', msgtype: 'm.text' });
  assert.deepEqual(mergeScheduledBody(undefined, 'hi'), { body: 'hi', msgtype: 'm.text' });
});

test('mergeScheduledBody preserves a non-text msgtype on edit', () => {
  const merged = mergeScheduledBody({ msgtype: 'm.emote', body: 'waves' }, 'nods');
  assert.deepEqual(merged, { msgtype: 'm.emote', body: 'nods' });
});