var remote = require("remote");
var remotefs = remote.require("fs-extra");
var dns = remote.require("dns");
var path = remote.require("path");

var userData = remote.require("app").getPath("userData");
var configPath = path.join(userData, "config.json");
var serversPath = path.join(userData, "servers.json");
var versionsPath = path.join(userData, "versions.json");

var versionArray;
var serverArray;
var config;

function enableServerListButtons() {
    $("#of-connect-button").removeClass("disabled");
    $("#of-connect-button").prop("disabled", false);
    $("#of-editserver-button").removeClass("disabled");
    $("#of-editserver-button").prop("disabled", false);
    $("#of-deleteserver-button").removeClass("disabled");
    $("#of-deleteserver-button").prop("disabled", false);
}

function disableServerListButtons() {
    $("#of-connect-button").addClass("disabled");
    $("#of-connect-button").prop("disabled", true);
    $("#of-editserver-button").addClass("disabled");
    $("#of-editserver-button").prop("disabled", true);
    $("#of-deleteserver-button").addClass("disabled");
    $("#of-deleteserver-button").prop("disabled", true);
}

function getAppVersion() {
    appVersion = remote.require("app").getVersion();

    // Simplify version, ex. 1.4.0 -> 1.4,
    // but only if a revision number isn't present
    if (appVersion.endsWith(".0")) {
        return appVersion.substr(0, appVersion.length - 2);
    } else {
        return appVersion;
    }
}

function setAppVersionText() {
    $("#of-aboutversionnumber").text("Version " + getAppVersion());
    $("#of-versionnumber").text("v" + getAppVersion());
}

function addServer() {
    var jsonToModify = JSON.parse(remotefs.readFileSync(serversPath));

    var server = {};
    server["uuid"] = uuidv4();
    server["description"] =
        $("#addserver-descinput").val().length == 0
            ? "My OpenFusion Server"
            : $("#addserver-descinput").val();
    server["ip"] =
        $("#addserver-ipinput").val().length == 0
            ? "127.0.0.1:23000"
            : $("#addserver-ipinput").val();
    server["version"] = $("#addserver-versionselect option:selected").text();
    //server['endpoint'] =

    jsonToModify["servers"].push(server);

    remotefs.writeFileSync(serversPath, JSON.stringify(jsonToModify, null, 4));
    loadServerList();
}

function editServer() {
    var jsonToModify = JSON.parse(remotefs.readFileSync(serversPath));
    $.each(jsonToModify["servers"], function (key, value) {
        if (value["uuid"] == getSelectedServer()) {
            value["description"] =
                $("#editserver-descinput").val().length == 0
                    ? value["description"]
                    : $("#editserver-descinput").val();
            value["ip"] =
                $("#editserver-ipinput").val().length == 0
                    ? value["ip"]
                    : $("#editserver-ipinput").val();
            value["version"] = $(
                "#editserver-versionselect option:selected"
            ).text();
        }
    });

    remotefs.writeFileSync(serversPath, JSON.stringify(jsonToModify, null, 4));
    loadServerList();
}

function deleteServer() {
    var jsonToModify = JSON.parse(remotefs.readFileSync(serversPath));
    var result = jsonToModify["servers"].filter(function (obj) {
        return obj.uuid === getSelectedServer();
    })[0];

    var resultindex = jsonToModify["servers"].indexOf(result);

    jsonToModify["servers"].splice(resultindex, 1);

    remotefs.writeFileSync(serversPath, JSON.stringify(jsonToModify, null, 4));
    loadServerList();
}

function restoreDefaultServers() {
    remotefs.copySync(
        path.join(__dirname, "/defaults/servers.json"),
        serversPath
    );
    loadServerList();
}

function loadGameVersions() {
    var versionJson = remotefs.readJsonSync(versionsPath);
    versionArray = versionJson["versions"];
    $.each(versionArray, function (key, value) {
        $(new Option(value.name, "val")).appendTo("#addserver-versionselect");
        $(new Option(value.name, "val")).appendTo("#editserver-versionselect");
    });
}

function loadConfig() {
    // Load config object globally
    config = remotefs.readJsonSync(configPath);
}

function loadServerList() {
    var serverJson = remotefs.readJsonSync(serversPath);
    serverArray = serverJson["servers"];

    $(".server-listing-entry").remove(); // Clear out old stuff, if any
    disableServerListButtons(); // Disable buttons until another server is selected

    if (serverArray.length > 0) {
        // Servers were found in the JSON
        $("#server-listing-placeholder").attr("hidden", true);
        $.each(serverArray, function (key, value) {
            // Create the row, and populate the cells
            var row = document.createElement("tr");
            row.className = "server-listing-entry";
            row.setAttribute("id", value.uuid);
            var cellName = document.createElement("td");
            cellName.textContent = value.description;
            var cellVersion = document.createElement("td");
            cellVersion.textContent = value.version;
            cellVersion.className = "text-monospace";

            row.appendChild(cellName);
            row.appendChild(cellVersion);
            $("#server-tablebody").append(row);
        });
    } else {
        // No servers are added, make sure placeholder is visible
        $("#server-listing-placeholder").attr("hidden", false);
    }
}

function performCacheSwap(newVersion) {
    var cacheRoot = path.join(
        userData,
        "/../../LocalLow/Unity/Web Player/Cache"
    );
    var currentCache = path.join(cacheRoot, "FusionFall");
    var newCache = path.join(cacheRoot, newVersion);
    var record = path.join(userData, ".lastver");

    // If cache renaming would result in a no-op (ex. launching the same version
    // two times), then skip it. This avoids permissions errors with multiple clients
    // (file/folder is already open in another process)
    var skip = false;

    if (remotefs.existsSync(currentCache)) {
        // Cache already exists, find out what version it belongs to
        if (remotefs.existsSync(record)) {
            var lastVersion = remotefs.readFileSync(record, (encoding = "utf8"));
            if (lastVersion != newVersion) {
                // Remove the directory we're trying to store the
                // existing cache to if it already exists for whatever
                // reason, as it would cause an EPERM error otherwise.
                // This is a no-op if the directory doesn't exist
                remotefs.removeSync(path.join(cacheRoot, lastVersion));
                // Store old cache to named directory
                remotefs.renameSync(
                    currentCache,
                    path.join(cacheRoot, lastVersion)
                );
            } else {
                console.log("Cached version unchanged, skipping rename");
                skip = true;
            }
            console.log("Current cache is " + lastVersion);
        }
    }

    // Make note of what version we are launching for next launch
    remotefs.writeFileSync(record, newVersion);
    
    if (remotefs.existsSync(newCache) && !skip) {
        // Rename saved cache to FusionFall
        remotefs.renameSync(newCache, currentCache);
        console.log("Current cache swapped to " + newVersion);
    }
}

// For writing loginInfo.php, assetInfo.php, etc.
function setGameInfo(serverUUID) {
    var result = serverArray.filter(function (obj) {
        return obj.uuid === serverUUID;
    })[0];
    var gameVersion = versionArray.filter(function (obj) {
        return obj.name === result.version;
    })[0];

    // If cache swapping property exists AND is `true`, run cache swapping logic
    if (config["cache-swapping"]) {
        try {
            performCacheSwap(gameVersion.name);
        } catch (ex) {
            console.log(
                "Error when swapping cache, it may get overwritten:\n" + ex
            );
        }
    }

    window.assetUrl = gameVersion.url; // game-client.js needs to access this

    remotefs.writeFileSync(path.join(__dirname, "assetInfo.php"), assetUrl);
    if (result.hasOwnProperty("endpoint")) {
        var httpEndpoint = result.endpoint.replace("https://", "http://");
        remotefs.writeFileSync(
            path.join(__dirname, "rankurl.txt"),
            httpEndpoint + "getranks"
        );
        // Write these out too
        remotefs.writeFileSync(
            path.join(__dirname, "sponsor.php"),
            httpEndpoint + "upsell/sponsor.png"
        );
        remotefs.writeFileSync(
            path.join(__dirname, "images.php"),
            httpEndpoint + "upsell/"
        );
    } else {
        // Remove/default the endpoint related stuff, this server won't be using it
        if (remotefs.existsSync(path.join(__dirname, "rankurl.txt"))) {
            remotefs.unlinkSync(path.join(__dirname, "rankurl.txt"));
            remotefs.writeFileSync(
                path.join(__dirname, "sponsor.php"),
                "assets/img/welcome.png"
            );
            remotefs.writeFileSync(
                path.join(__dirname, "images.php"),
                "assets/img/"
            );
        }
    }

    // Server address parsing
    var address;
    var port;
    var sepPos = result.ip.indexOf(":");
    if (sepPos > -1) {
        address = result.ip.substr(0, sepPos);
        port = result.ip.substr(sepPos + 1);
    } else {
        address = result.ip;
        port = 23000; // default
    }

    // DNS resolution. there is no synchronous version for some stupid reason
    if (!address.match(/^[0-9.]+$/))
        dns.lookup(address, (family = 4), function (err, resolvedAddress) {
            if (!err) {
                console.log("Resolved " + address + " to " + resolvedAddress);
                address = resolvedAddress;
            } else {
                console.log("Err: " + err.code);
            }
            prepConnection(address, port);
        });
    else {
        console.log(address + " is an IP; skipping DNS lookup");
        prepConnection(address, port);
    }
}

function prepConnection(address, port) {
    var full = address + ":" + port;
    console.log("Will connect to " + full);
    remotefs.writeFileSync(path.join(__dirname, "loginInfo.php"), full);
    launchGame();
}

// Returns the UUID of the server with the selected background color.
// Yes, there are probably better ways to go about this, but it works well enough.
function getSelectedServer() {
    return $("#server-tablebody > tr.bg-primary").prop("id");
}

function connectToServer() {
    // Get ID of the selected server, which corresponds to its UUID in the json
    console.log("Connecting to server with UUID of " + getSelectedServer());

    // Prevent the user from clicking anywhere else during the transition
    $("body,html").css("pointer-events", "none");
    stopEasterEggs();
    $("#of-serverselector").fadeOut("slow", function () {
        setTimeout(function () {
            $("body,html").css("pointer-events", "");
            setGameInfo(getSelectedServer());
        }, 200);
    });
}

// If applicable, deselect currently selected server.
function deselectServer() {
    disableServerListButtons();
    $(".server-listing-entry").removeClass("bg-primary");
}

$("#server-table").on("click", ".server-listing-entry", function (event) {
    enableServerListButtons();
    $(this).addClass("bg-primary").siblings().removeClass("bg-primary");
});

// QoL feature: if you double click on a server it will connect
$("#server-table").on("dblclick", ".server-listing-entry", function (event) {
    $(this).addClass("bg-primary").siblings().removeClass("bg-primary");
    connectToServer();
});

$("#of-editservermodal").on("show.bs.modal", function (e) {
    var jsonToModify = remotefs.readJsonSync(
        path.join(userData, "servers.json")
    );
    $.each(jsonToModify["servers"], function (key, value) {
        if (value["uuid"] == getSelectedServer()) {
            $("#editserver-descinput")[0].value = value["description"];
            $("#editserver-ipinput")[0].value = value["ip"];

            var versionIndex = -1;
            $.each($("#editserver-versionselect")[0], function (key, val) {
                if (val.text === value["version"]) {
                    versionIndex = key;
                }
            });
            $("#editserver-versionselect")[0].selectedIndex = versionIndex;
        }
    });
});

$("#of-deleteservermodal").on("show.bs.modal", function (e) {
    var result = serverArray.filter(function (obj) {
        return obj.uuid === getSelectedServer();
    })[0];
    $("#deleteserver-servername").html(result.description);
});