var JD2_API_URL = 'http://localhost:9666/flashgot?';
var JD2_REFERER = 'localhost';
var JD2_MATCH_URL = "*://*/flashgot?*";


function onError(error) {
    console.log('UrlToJD2_error: ' + error);
}

// On startup, check autostart option stored setting or default value
const gettingStoredSettings = browser.storage.local.get();
gettingStoredSettings.then((item) => {
    if (!item.autostart) {
        browser.storage.local.set({ autostart: true })
    }
},
    onError);


function makeRequest(url) {
    var req = new XMLHttpRequest();
    req.open('GET', url, true);
    req.send(null);
    req.onload = function () {
        // console.log(req.status);
        if (req.readyState === 4 && req.status === 200) {
            // console.log(req.responseText);
            // notify...
        } else {
            onError(req.statusText);
        }
    }
}

function urlConstruct(url, autostart) {
    return JD2_API_URL + "autostart=" + autostart + "&urls=" + encodeURIComponent(url);
}


function bool_to_int(bool) {
    return (bool == true) ? 1 : 0;
}

// main
function loadTabUrlToJD2Crawl(storedSettings) {
    var gettingActiveTab = browser.tabs.query({ active: true, currentWindow: true });
    gettingActiveTab.then((tabs) => {
        if (tabs[0]) {
            currentTabUrl = tabs[0].url;
            url_for_JD2 = urlConstruct(currentTabUrl, bool_to_int(storedSettings.autostart));
            // console.log(url_for_JD2);
            makeRequest(url_for_JD2);
        }
    }, onError);
}


browser.pageAction.onClicked.addListener(() => {
    const gettingStoredSettings = browser.storage.local.get();
    gettingStoredSettings.then(loadTabUrlToJD2Crawl, onError);
});


// menu
const sendToJD2Id = "send-to-JD2";
function onCreated() {
  if (browser.runtime.lastError) {
    onError(browser.runtime.lastError);
  }
}

browser.menus.create({
  id: sendToJD2Id,
  title: "send to JD2",
  contexts: ["link"]
}, onCreated);


browser.menus.onClicked.addListener((info, tab) => {
  if (info.menuItemId === sendToJD2Id) {
    const gettingStoredSettings = browser.storage.local.get();
    gettingStoredSettings.then((storedSettings) => {
        url_for_JD2 = urlConstruct(info.linkUrl, bool_to_int(storedSettings.autostart));
        makeRequest(url_for_JD2);
    }, onError);
  }
});

function updateMenuItem(link) {
  browser.menus.update(sendToJD2Id, {
    title: `Send to JD2: "${link}"`
  });
  browser.menus.refresh();
}

browser.menus.onShown.addListener(info => {
  if (!info.linkUrl) {
    return;
  }
  updateMenuItem(info.linkUrl);
});


// Some functions for a good referer !

// https://stackoverflow.com/a/11602753
function mod_headers(header_array, p_name, p_value) {
    var did_set = false;
    for (var i in header_array) {
        var header = header_array[i];
        var name = header.name;
        // var value = header.value;
        // If the header is already present, change it:
        if (name == p_name) {
            header.value = p_value;
            did_set = true;
        }
    }
    // if it is not, add it:
    if (!did_set) { header_array.push({ name: p_name, value: p_value }); }
}

function rewriteHeader(e) {
    mod_headers(e.requestHeaders, 'Referer', JD2_REFERER);
    // for (var header of e.requestHeaders) { console.log(header.name + '::' + header.value); }
    return { requestHeaders: e.requestHeaders };
}

browser.webRequest.onBeforeSendHeaders.addListener(
    rewriteHeader,
    { urls: [JD2_MATCH_URL] },
    ["blocking", "requestHeaders"]
);