content.js

const script = document.createElement('script');
script.src = chrome.runtime.getURL('inject.js');
script.type = 'text/javascript';
(document.head || document.documentElement).appendChild(script);

chrome.runtime.onMessage.addListener((message) => {
  if (message.type === 'COPY_REPOST_URL_REQUEST') {
    window.postMessage({ type: 'EXECUTE_COPY_FROM_INJECT' }, '*');
  }
});

window.addEventListener('message', (event) => {
  if (event.source !== window || !event.data || typeof event.data.type !== 'string') return;
  const type = event.data.type;
  if (type === 'UPDATE_CONTEXT_MENU_STATE') {
    chrome.runtime.sendMessage({ type: 'UPDATE_CONTEXT_MENU', enabled: event.data.enabled });
    return;
  }
  if (type === 'GET_I18N_MESSAGE') {
    const message = chrome.i18n.getMessage(event.data.key) || '';
    window.postMessage({ type: 'I18N_MESSAGE_RESULT', key: event.data.key, message: message }, '*');
    return;
  }
  if (type === 'REPOST_URL_TO_COPY') {
    const url = event.data.url;
    if (typeof url !== 'string' || !url) {
      const msg = chrome.i18n.getMessage('copyFailGeneric') || 'Copy failed';
      window.postMessage({ type: 'I18N_MESSAGE_RESULT', message: msg }, '*');
      return;
    }
    copyTextToClipboard(url).catch(() => {
      const msg = chrome.i18n.getMessage('copyFailGeneric') || 'Copy failed. Please right-click on the repost again.';
      window.postMessage({ type: 'I18N_MESSAGE_RESULT', message: msg }, '*');
    });
    return;
  }
});

function copyTextToClipboard(text) {
  if (navigator.clipboard && typeof navigator.clipboard.writeText === 'function') {
    return navigator.clipboard.writeText(text);
  }
  return new Promise((resolve, reject) => {
    try {
      const ta = document.createElement('textarea');
      ta.value = text;
      ta.style.position = 'fixed';
      ta.style.left = '-9999px';
      ta.setAttribute('readonly', '');
      document.body.appendChild(ta);
      ta.focus();
      ta.select();
      const ok = document.execCommand('copy');
      document.body.removeChild(ta);
      if (ok) resolve();
      else reject(new Error('execCommand failed'));
    } catch (e) {
      reject(e);
    }
  });
}