/***** Content JS for Chrome Extension: Tracking Proxy Helper *****/

/*** Initialisation ***/
let tpdm = { activeTabId: null, activeWindowId: null, extInit: false, tpl: { tpId: '', sessId: '', eventCount: 0 } };
tpdm.data = tpdm.data || JSON.parse(JSON.stringify(tpdm.tpl));
//console.log('content.js loaded');

/*** Logic ***/

// Function to inject javascript code into the Page DOM
// --> Accessing window object see: https://silverbirder.github.io/en-US/blog/contents/chrome_extension_development_feedback/
const injectScript = (filePath, id, tag) => {
  if (!document.getElementById(id)) {
    var node = document.getElementsByTagName(tag)[0];
    var script = document.createElement("script");
    script.setAttribute("type", "text/javascript");
    script.setAttribute("src", filePath);
    script.setAttribute("id", id);
    node.appendChild(script);
  }
};

// Listener to receive messages from the injected script
window.addEventListener('message', function(event) {
  //console.log('Message received from injected script:', event);
  if (event.data.type === 'CHECK_TPT_RESULT') {
    //console.log('Message received from injected script:', event);
    if (event.data.chaChanged) { chrome.runtime.sendMessage({ type: 'CHECK_TPT', chaChanged:true, tpobj:event.data.tpobj }); }
    else { chrome.runtime.sendMessage({ type: 'CHECK_TPT', hasTPT: event.data.hasTPT, hasSessID: event.data.hasSessID, tpobj:event.data.tpobj }); }
  }
  if (event.data.type === 'TRACKING_PROXY_RESPONSE') {
    //console.log('Message received from injected TP script:', event);
    const eventData = event.data.details.eventData;
    const metaData = event.data.details.metaData;
    chrome.runtime.sendMessage({ type: 'TRACKING_PROXY_EVENT', details: { eventData:eventData, metaData:metaData } });
  }
});

// Listener for messages from the background script
chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
  if (message.type === 'TRACKING_PROXY_REQUEST') {
    window.postMessage({ type: 'TRACKING_PROXY_REDIRECT', details: message.details }, '*');
  }
});


// Inject script on document load
if (document.readyState === 'complete' || document.readyState === 'interactive') {
  injectScript(chrome.runtime.getURL("inject-listener.js"), "tp_dev_mode_script", "head");
} else {
  document.addEventListener('DOMContentLoaded', function() {
    injectScript(chrome.runtime.getURL("inject-listener.js"), "tp_dev_mode_script", "head");
  });
}

chrome.storage.sync.get(['scriptContent', 'scriptUrl', 'scriptUrlIsRegex'], function(data) {
  const scriptContent = data.scriptContent || '';
  const scriptUrl = data.scriptUrl || '';
  const scriptUrlIsRegex = data.scriptUrlIsRegex || false;

  if (!scriptUrl || !scriptContent) {
    //console.log('No script URL or script content defined, no script injected');
    return;
  }

  let urlMatches;
  if (scriptUrlIsRegex) {
    const regex = new RegExp(scriptUrl);
    urlMatches = regex.test(window.location.href);
  } else {
    urlMatches = window.location.href.includes(scriptUrl);
  }

  if (urlMatches) {
    if (!document.getElementById('tp_user_script')) {
      //console.log(`Injecting script into URL: ${window.location.href}`);
      const script = document.createElement('script');
      script.src = chrome.runtime.getURL('inject-userscript.js');
      script.setAttribute("id", "tp_user_script");
      (document.head || document.documentElement).appendChild(script);
      script.onload = function() {
        window.postMessage({ type: 'INJECT_USER_SCRIPT', scriptContent: scriptContent }, '*');
        script.remove();
      };
    }
  } else {
    //console.log(`URL does not match, no script injected for URL ${window.location.href}`);
  }
});

// EOF