// Copyright 2017; Licensed under the Apache License, Version 2.0: https://www.apache.org/licenses/LICENSE-2.0

'use strict';

function might_have_japanese(text)
{
    for(let char of text)
        if(char && char.length > 0 && char.codePointAt(0) >= 0x2E80)
            return true;
    return false;
}

function update(text)
{
    if(!might_have_japanese(text))
        return;
    
    let target = document.body;
    let newnode = document.createElement("p");
    newnode.textContent = text;
    
    target.insertBefore(newnode, document.body.firstChild);
}

let text_previous = "";
function cycle_text(text)
{
    if(text != "" && text != text_previous)
        update(text);
    text_previous = text;
}

function gimmetext()
{
    browser.runtime.sendMessage({type:"gimmetext"});
}

let interval = 250;
async function checkpaste()
{
    try
    {
        let text = await gimmetext();
        cycle_text(text);
    }
    catch(error){}
    
    setTimeout(checkpaste, interval);
}
setTimeout(checkpaste, interval);

var executing = browser.tabs.executeScript({
    file: "/texthook.js",
    allFrames: true
});

browser.runtime.onMessage.addListener((req, sender, sendResponse) =>
{
    if (req.type == "text")
        cycle_text(req.text);
});