/*
Copyright 2019 Intel Corporation

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

function empty_func()
{
    var p = this.parent;
    if (p != null)
    {
        if (p._ipc) { p._ipc.parent = null };
        if (p._ipc2) { p._ipc2.parent = null; }
        if (p._client) { p._client._parent = null; }
        p._client = null;
        if (p._control) { p._control._parent = null; }
        p._control = null;
        p = null;
    }
}
function empty_func2()
{
}

function ipc_invoke(method, args)
{
    var d, h = Buffer.alloc(4);
    d = Buffer.from(JSON.stringify({ command: 'invoke', value: { method: method, args: args } }));
    h.writeUInt32LE(d.length + 4);
    this._control.write(h);
    this._control.write(d);
}

function ipc1_finalized()
{
    //console.log('IPC1 Finalized');
}
function ipc2_finalized()
{
    //console.log('IPC2 Finalized');
}
function ipc1_server_finalized()
{
    //console.log('IPC1 Server Finalized');
}
function ipc2_server_finalized()
{
    //console.log('IPC2 Server Finalized');
}
function ipc2_connection(s)
{
    this.parent._control = s;
    this.parent._control._parent = this;
    this.close();
    this.parent.invoke = ipc_invoke;
    s.on('end', empty_func2); // DO NOT DELETE this line
    s.on('~', ipc2_finalized);
}
function ipc_connection(s)
{
    this.parent._client = s;
    this.parent._client._parent = this;
    this.close();
    var d, h = Buffer.alloc(4);
    s.descriptorMetadata = 'win-dispatcher, ' + this.parent.options.launch.module + '.' + this.parent.options.launch.method + '()';

    for (var m in this.parent.options.modules)
    {
        d = Buffer.from(JSON.stringify({ command: 'addModule', value: { name: this.parent.options.modules[m].name, js: this.parent.options.modules[m].script } }));
        h.writeUInt32LE(d.length + 4);
        s.write(h);
        s.write(d);
    }
    d = Buffer.from(JSON.stringify({ command: 'launch', value: { split: this.parent.options.launch.split ? true : false, module: this.parent.options.launch.module, method: this.parent.options.launch.method, args: this.parent.options.launch.args } }));
    h.writeUInt32LE(d.length + 4);
    s.write(h);
    s.write(d);
    s.on('~', ipc1_finalized);
    this.parent.emit('connection', s);
}

function dispatcher_shutdown()
{
    this._ipc.close();
    this._ipc2.close();
    this._ipc = null;
    this._ipc2 = null;
}

function dispatch(options)
{
    if (!options || !options.modules || !options.launch || !options.launch.module || !options.launch.method || !options.launch.args) { throw ('Invalid Parameters'); }

    var ipcInteger
    var ret = { options: options };
    require('events').EventEmitter.call(ret, true).createEvent('connection');

    ret._ipc = require('net').createServer(); ret._ipc.parent = ret;
    ret._ipc2 = require('net').createServer(); ret._ipc2.parent = ret;
    ret._ipc.on('close', empty_func);
    ret._ipc2.on('close', empty_func);
    ret._ipc.once('~', ipc1_server_finalized);
    ret._ipc2.once('~', ipc2_server_finalized);

    while (true)
    {
        ipcInteger = require('tls').generateRandomInteger('1000', '9999');
        ret._ipcPath = '\\\\.\\pipe\\taskRedirection-' + ipcInteger;
        
        try
        {
            ret._ipc.listen({ path: ret._ipcPath, writableAll: true });
            ret._ipc2.listen({ path: ret._ipcPath + 'C', writableAll: true });
            break;
        }
        catch (x)
        {
        }
    }
    var str = Buffer.from("require('win-console').hide();require('win-dispatcher').connect('" + ipcInteger + "');").toString('base64');
    ret._ipc2.once('connection', ipc2_connection);
    ret._ipc.once('connection', ipc_connection);
    ret.close = dispatcher_shutdown;

    try
    {
        var user = null;
        var domain = null;
        if(options.user == null)
        {
            if (require('user-sessions').getProcessOwnerName(process.pid).tsid == 0)
            {
                user = 'SYSTEM'
            }
            else
            {
                var info = require('user-sessions').getProcessOwnerName(process.pid);
                user = info.name;
                domain = info.domain;
            }   
        }
        else
        {
            var u = options.user;
            if (u[0] == '"') { u = u.substring(1, u.length - 1); }
            var tokens = u.split('\\');
            if(tokens.length!=2) { throw('invalid user format');}
            user = tokens[1];
            domain = tokens[0];
        }

        console.info1('user- ' + user, 'domain- ' + domain);

        var task = { name: 'MeshUserTask', user: user, domain: domain, execPath: process.execPath, arguments: ['-b64exec ' + str] };
        require('win-tasks').addTask(task);
        require('win-tasks').getTask({ name: 'MeshUserTask' }).run();
        require('win-tasks').deleteTask('MeshUserTask');
        return (ret);
    }
    catch(xx)
    {
        console.info1(xx);
    }

    console.info1('Using SCHTASKS...');

    var taskoptions = { env: { _target: process.execPath, _args: '-b64exec ' + str, _user: '"' + options.user + '"' } };
    for (var c1e in process.env)
    {
        taskoptions.env[c1e] = process.env[c1e];
    }

    var child = require('child_process').execFile(process.env['windir'] + '\\System32\\WindowsPowerShell\\v1.0\\powershell.exe', ['powershell', '-noprofile', '-nologo', '-command', '-'], taskoptions);
    child.stderr.on('data', empty_func2);
    child.stdout.on('data', empty_func2);
    child.stdin.write('SCHTASKS /CREATE /F /TN MeshUserTask /SC ONCE /ST 00:00 ');
    if (options.user)
    {
        child.stdin.write('/RU $env:_user ');
    }
    else
    {
        if (require('user-sessions').getProcessOwnerName(process.pid).tsid == 0)
        {
            // LocalSystem
            child.stdin.write('/RU SYSTEM ');
        }
    }
    child.stdin.write('/TR "$env:_target $env:_args"\r\n');
    child.stdin.write('$ts = New-Object -ComObject Schedule.service\r\n');
    child.stdin.write('$ts.connect()\r\n');
    child.stdin.write('$tsfolder = $ts.getfolder("\\")\r\n');
    child.stdin.write('$task = $tsfolder.GetTask("MeshUserTask")\r\n');
    child.stdin.write('$taskdef = $task.Definition\r\n');
    child.stdin.write('$taskdef.Settings.StopIfGoingOnBatteries = $false\r\n');
    child.stdin.write('$taskdef.Settings.DisallowStartIfOnBatteries = $false\r\n');
    child.stdin.write('$taskdef.Actions.Item(1).Path = $env:_target\r\n');
    child.stdin.write('$taskdef.Actions.Item(1).Arguments = $env:_args\r\n');
    child.stdin.write('$tsfolder.RegisterTaskDefinition($task.Name, $taskdef, 4, $null, $null, $null)\r\n');

    child.stdin.write('SCHTASKS /RUN /TN MeshUserTask\r\n');
    child.stdin.write('SCHTASKS /DELETE /F /TN MeshUserTask\r\nexit\r\n');

    child.waitExit();
    return (ret);
}

function connect(ipc)
{
    var ipcPath = '\\\\.\\pipe\\taskRedirection-' + ipc;
    global.ipc2Client = require('net').createConnection({ path: ipcPath + 'C' }, function ()
    {
        this.on('data', function (c)
        {
            var cLen = c.readUInt32LE(0);
            if (cLen > c.length)
            {
                this.unshift(c);
                return;
            }
            var cmd = JSON.parse(c.slice(4, cLen).toString());
            switch (cmd.command)
            {
                case 'invoke':
                    global._proxyStream[cmd.value.method].apply(global._proxyStream, cmd.value.args);
                    break;
            }

            if (cLen < c.length) { this.unshift(c.slice(cLen)); }
        });
    });
    global.ipcClient = require('net').createConnection({ path: ipcPath }, function ()
    {
        this.on('close', function () { process.exit(); });
        this.on('data', function (c)
        {
            var cLen = c.readUInt32LE(0);
            if (cLen > c.length)
            {
                this.unshift(c);
                return;
            }
            var cmd = JSON.parse(c.slice(4, cLen).toString());
            switch (cmd.command)
            {
                case 'addModule':
                    addModule(cmd.value.name, cmd.value.js);
                    break;
                case 'launch':
                    var obj = require(cmd.value.module);
                    global._proxyStream = obj[cmd.value.method].apply(obj, cmd.value.args);
                    if (cmd.value.split)
                    {
                        global._proxyStream.out.pipe(this, { end: false });
                        this.pipe(global._proxyStream.in, { end: false });
                        global._proxyStream.out.on('end', function () { process.exit(); });
                    }
                    else
                    {
                        global._proxyStream.pipe(this, { end: false });
                        this.pipe(global._proxyStream, { end: false });
                        global._proxyStream.on('end', function () { process.exit(); });
                    }
                    this.on('end', function () { process.exit(); });
                    break;
            }

            if (cLen < c.length) { this.unshift(c.slice(cLen)); }
        });
    });
    global.ipcClient.on('error', function () { process.exit(); });
    global.ipc2Client.on('error', function () { process.exit(); });
}

module.exports = { dispatch: dispatch, connect: connect };