function OnInit(initData) {
    initData.name = 'UpdateEverythingFolderSize';
    initData.version = '2023-08-21';
    initData.copyright = '';
    initData.url = 'https://resource.dopus.com/t/everythingfoldersize-use-everything-to-calculate-folder-sizes/44281';
    initData.desc = '';
    initData.default_enable = true;
    initData.min_version = '12.0';
}

// var log = true;
var log = false;

var cmd = DOpus.Create().Command();
var stt = DOpus.Create().StringTools();
var fsu = DOpus.FSUtil();
var wsh = new ActiveXObject('WScript.Shell');

var exeES = fsu.Resolve('/programfiles\\Everything\\es.exe'); // Check "Index folder size" in Tools-Options-Indexes
// var exeES = fsu.Resolve('/programfiles\\Everything 1.5a\\es.exe'); // Everything-1.5a.ini needs to contain this line: alpha_instance=0

if (fsu.Exists(exeES)) {
    // if (log) DOpus.Output('"' + exeES + '" found!');
} else {
    DOpus.Output('"' + exeES + '" not found!');
}

function OnOpenTab(openTabData) {
    if (openTabData.tab.path == undefined) {
        if (log) DOpus.Output('openTabData.tab.path == undefined');
        return;
    }

    cmd.SetSourceTab(openTabData.tab);
    if (!cmd.IsSet('Set COLUMNSTOGGLE=scp:EverythingFolderSize/EverythingFolderSize')) {
        if (log) DOpus.Output('Column "EverythingFolderSize" not in this file display - nothing to do!');
        return;
    }

    if (!fsu.Exists(exeES)) {
        if (log) DOpus.Output('"' + exeES + '" MIA!');
        return;
    }

    if (log) DOpus.Output('OnOpenTab: Calling QueryEverything...');
    QueryEverything(openTabData.tab.path);

    cmd.RunCommand('Go REFRESH');  // seems to be needed here
}

function OnBeforeFolderChange(beforeFolderChangeData) {
    if (beforeFolderChangeData.tab.path == undefined) {
        if (log) DOpus.Output('beforeFolderChangeData.tab.path == undefined');
        return;
    }

    if (beforeFolderChangeData.path == undefined) {
        if (log) DOpus.Output('beforeFolderChangeData.path == undefined');
        return;
    }

    if (beforeFolderChangeData.path.drive == 0) {
        if (log) DOpus.Output('beforeFolderChangeData.path.drive == 0');
        return;
    }

    cmd.SetSourceTab(beforeFolderChangeData.tab);
    if (!cmd.IsSet('Set COLUMNSTOGGLE=scp:EverythingFolderSize/EverythingFolderSize')) {
        if (log) DOpus.Output('Column "EverythingFolderSize" not in this file display - nothing to do!');
        return;
    }

    if (!fsu.Exists(exeES)) {
        if (log) DOpus.Output('"' + exeES + '" MIA!');
        return;
    }

    if (log) DOpus.Output('OnBeforeFolderChange: Calling QueryEverything...');
    QueryEverything(beforeFolderChangeData.path);
}

function QueryEverything(path) {
    var exportFile = fsu.GetTempFilePath();

    var cmdLine = '"' + exeES + '"' +
        ' -size' +
        ' -no-header' +
        ' -export-csv "' + exportFile + '"' +
        ' -parent "' + path + '"' +
        ' /ad';

    if (log) DOpus.Output(cmdLine);
    wsh.Run(cmdLine, 0, true);

    var vec = DOpus.Create().Vector(stt.Decode(fsu.GetItem(exportFile).Open().Read(), 'utf8').split('\r\n'));

    var re = /(\d+),(.*)/;

    for (var e = new Enumerator(vec); !e.atEnd(); e.moveNext()) {
        var line = e.item().match(re);
        if (line == null) continue;
        if (line.length != 3) continue;
        var size = line[1];
        var dirVar = 'EFS' + line[2];
        DOpus.vars.Set(dirVar, size);
        if (log) DOpus.Output(dirVar + '\t' + size);  // useful, if communicaton with Everything is faulty
    }
}