//======================================================================

// Inner functions

//======================================================================

/**

* Send event to inject script

* @param {*} type event type defined on inject script

* @param {*} data data to send

*/

function sendEvent(type, data='') {

let detailObj = { type: type, data: data };

let evt = new CustomEvent('vpcomm', { bubbles: true, detail: detailObj });

console.log('[vp content] send from content - ', type, data, evt);

document.dispatchEvent(evt);

}

function checkScriptExists(url) {

return document.querySelectorAll(`script[src="${url}"]`).length > 0;

}

/**

* Inject file

*/

function injectFile() {

let url = chrome.runtime.getURL('inject.js');

console.log('[vp content] check inject file...')

if (checkScriptExists(url)) {

console.log('[vp content] inject file already exist!');

return false;

}

console.log('[vp content] inject file!');

// inject script

var s = document.createElement('script');

s.src = url;

s.onload = function() {

// send event to inject.js to send its url

var url = chrome.runtime.getURL('');

// var evt = new CustomEvent('vpcomm', { bubbles: true, detail: { type: 'sendBase', data: url } });

// document.dispatchEvent(evt);

sendEvent('sendBase', url);

};

(document.head || document.documentElement).appendChild(s);

return true;

}

//======================================================================

// Event listener - background <-> (content -> inject)

//======================================================================

function msgHandler(msg, sender) {

if (msg && msg.type) {

switch(msg.type) {

case "toggle":

injectFile();

sendEvent('toggle');

break;

default:

break;

}

}

}

chrome.runtime.onMessage.removeListener(msgHandler);

chrome.runtime.onMessage.addListener(msgHandler);

console.log('[vp content] content script executed!');

// End of file