// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

const words = {
  extensions:
    'Extensions are software programs, built on web technologies (such as HTML, CSS, and JavaScript) that enable users to customize the Chrome browsing experience.',
  popup:
    "A UI surface which appears when an extension's action icon is clicked."
};

chrome.storage.session.get('lastWord', ({ lastWord }) => {
  updateDefinition(lastWord);
});

chrome.storage.session.onChanged.addListener((changes) => {
  const lastWordChange = changes['lastWord'];

  if (!lastWordChange) {
    return;
  }

  updateDefinition(lastWordChange.newValue);
});

function updateDefinition(word) {
  // If the side panel was opened manually, rather than using the context menu,
  // we might not have a word to show the definition for.
  if (!word) return;

  // Hide instructions.
  document.body.querySelector('#select-a-word').style.display = 'none';

  // Show word and definition.
  document.body.querySelector('#definition-word').innerText = word;
  document.body.querySelector('#definition-text').innerText =
    words[word.toLowerCase()] ??
    `Unknown word! Supported words: ${Object.keys(words).join(', ')}`;
}