// ==UserScript==
// @name                Trisquel Userlist Highlighting
// @description         Helps find spammers on the Trisquel.info userlist
// @include             /^https?://trisquel\.info/(en|es|fr|gl|de)/about($|\?page=.*$)/
// @grant               GM_xmlhttpRequest
// ==/UserScript==

"use strict";

// constants
var settingsURL = "http://localhost/trisquelspammers.json"; // edit this
var settingsURLAddDate = true; // appends a date to the URL, e.g. ?date=807937200000

// globals
var userElems = [];
var users;
var saveBtn;

function saveRequired() {
    saveBtn.style.display = "block";
}

function saveNotRequired() {
    saveBtn.style.display = "none";
}

function saveJSON() {
    var usersJSON = JSON.stringify(users);

    window.open(
        "data:application/octet-stream;base64," + window.btoa(usersJSON),
        "Save JSON",
        "width=100,height=100"
    );
    saveNotRequired();
}

function getUserNameFromElem(userElem) {
    var href, usernameMatch;

    href = userElem.getAttribute("href");
    if (!href) throw 'non-existent attribute "href"';

    usernameMatch = href.match(/(?:https?:\/\/trisquel.info)?\/[a-z]+\/users\/(.+)$/);
    if (!usernameMatch) throw 'non-matching URL: ' + href;

    return usernameMatch[1];
}

function highlightUser(userElem, userIsSpammer) {
    var color;

    switch (userIsSpammer) {
        case "y":
            color = "red";
            break;
        case "n":
            color = "#3B5996";
            break;
        default:
            color = "black";
    }
    userElem.style.color = color;
}

function setStatus(username, userIsSpammer, userElem) {
    highlightUser(userElem, userIsSpammer);
    saveRequired();
    if (userIsSpammer == "?")
        delete users[username];
    else
        users[username] = {"spam":userIsSpammer};
}

function showUserMenu(event) {
    var sender = event.target, username, popupInput, userIsSpammer;

    event.preventDefault();
    username = getUserNameFromElem(sender);
    if (!username) return;

    do {
        popupInput = window.prompt(
            "Options:\r\n" +
            "(1) set user as spammer\r\n" +
            "(2) set user as unknown\r\n" +
            "(3) set user as okay\r\n" +
            "(0) visit user page\r\n\r\n" +
            "Enter a number:",
            "1"
        );

        switch (popupInput) {
            case "1":
                userIsSpammer = "y";
                break;
            case "2":
                userIsSpammer = "?";
                break;
            case "3":
                userIsSpammer = "n";
                break;
            case "0":
                if (window.confirm("Do you want to save changes before leaving this page?\r\n" +
                    "Else, changes will be lost.")) {
                    saveJSON();
                }
                window.top.location = sender.href;
                return;
            case null:
                return;
        }

        if (!userIsSpammer) {
            window.alert("You did not enter a valid option. Please try again.");
        }
    } while (!userIsSpammer);

    setStatus(username, userIsSpammer, sender);
}

function setupUserLink(userElem) {
    userElem.addEventListener("click", showUserMenu, false);
}

function discoverUsers() {
    var u, lenU, userElem, username, user, userIsSpammer;

    userElems = document.getElementsByClassName("views-view-grid")[0].getElementsByTagName("a");
    for (u = 0, lenU = userElems.length; u < lenU; u += 1) {
        userElem = userElems[u];
        username = getUserNameFromElem(userElem);
        user = users[username];
        userIsSpammer = ((user) ? user["spam"] : null);
        highlightUser(userElem, userIsSpammer);
        setupUserLink(userElem);
    }
}

function setupSaveBtn() {
    saveBtn = document.createElement("button");
    saveBtn.addEventListener("click", saveJSON, false);
    saveBtn.setAttribute("id", "saveBtn");
    saveNotRequired();
    saveBtn.appendChild(document.createTextNode("Save changes"));
    document.getElementsByClassName("views-view-grid")[0].parentNode.appendChild(saveBtn);
}

var settingsURLDate = ((settingsURLAddDate) ? "?date=" + Date.parse(new Date()) : "");

GM_xmlhttpRequest({
    method: "GET",
    url: settingsURL + settingsURLDate,
    onload: function (response) {
        if (response.responseText) {
            users = JSON.parse(response.responseText);
            setupSaveBtn();
            discoverUsers();
        }
    }
});