## Define the MSP name
$MSPName = "Emberkom"

## Setup the MSP management directories
If ( Test-Path ${Env:ProgramData} )
{ $MSPRoot = "${Env:ProgramData}\${MSPName}" } Else { $MSPRoot = "${Env:SystemDrive}\${MSPName}" }
$MSPScripts = "${MSPRoot}\Scripts"
$MSPTools = "${MSPRoot}\Tools"
$MSPLogs = "${MSPRoot}\Logs"

## Make sure all the management directories exist
$MSPRoot, $MSPScripts, $MSPTools, $MSPLogs | ForEach-Object {
    If ( !(Test-Path $_) )
    {
        Try { New-Item -Path $MSPRoot -ItemType Directory -Force -ErrorAction SilentlyContinue | Out-Null }
        Catch { Write-Output $_.Exception.Message ; Exit }
    }
}

## Set a file prefix for any logs that might need to be created
$LogFilePrefix = Get-Date -Format "yyyyMMddHHmmss"

## Function to log activity to the configured log directory
Function Log
{
param(
    [Parameter(Mandatory=$true,ValueFromPipeline=$true)][string]$Message,
    [Parameter(Mandatory=$false)][switch]$Error=$false,
    [Parameter(Mandatory=$false)][string]$Name
)
$Timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
If ( $Error ) { $LogEntry = "${Timestamp} - Error: ${Message}" }
Else { $LogEntry = "${Timestamp} - ${Message}" }
If ( $Name )
{
    $LogFile = "${MSPLogs}\${LogFilePrefix}-${Name}.log"
    If ( !(Test-Path $LogFile) ) { New-Item -Path $LogFile -ItemType File -Force | Out-Null }
    Add-Content -Path $LogFile -Value $LogEntry
    Write-Output $LogEntry
}
Else { Write-Output $LogEntry }
}

## Function to determine if the current user context is an Administrator
Function IsAdmin
{
If ( ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator) )
{ Return $true } Else { Return $false }
}

## Run a script from the live repo or from a local path
Function Run-Script
{
param(
    ## Parameters for live-ps scripts
    [Parameter(Mandatory=$false,ParameterSetName='live-ps')]
    [string]$Type='management-scripts',
    [Parameter(Mandatory=$true,ParameterSetName='live-ps')]
    [string]$LivePSScript,
    ## Parameters for local scripts
    [Parameter(Mandatory=$true,ParameterSetName='local')]
    [string]$Path,
    #### $NoWait will prevent waiting for the specified script to finish running
    [Parameter(Mandatory=$false,ParameterSetName='local')]
    [switch]$NoWait=$false,
    ## Parameters for all scripts
    [Parameter(Mandatory=$false,ParameterSetName='live-ps')]
    [Parameter(Mandatory=$false,ParameterSetName='local')]
    [string]$Arguments='null',
    #### $HaltIfRunning is a collection of app names which, if running, will prevent the script from running
    [Parameter(Mandatory=$false,ParameterSetName='live-ps')]
    [Parameter(Mandatory=$false,ParameterSetName='local')]
    [string[]]$HaltIfRunning='null',
    #### $ForceClose will forcefully close all apps specified in $HaltIfRunning
    [Parameter(Mandatory=$false,ParameterSetName='live-ps')]
    [Parameter(Mandatory=$false,ParameterSetName='local')]
    [switch]$ForceClose=$false
)
$LogName = $MyInvocation.MyCommand
If ( $Arguments -eq "null" ) { $Arguments = $null }
If ( $HaltIfRunning -eq "null" ) { $HaltIfRunning = $null }
If ( $LivePSScript )
{
    $URL = "https://dev.emberkom.com/emberkom/${Type}/raw/branch/master/${LivePSScript}.ps1"
    If ( !(IsURLValid -URL $URL) ) { Log "The specified script does not exist: ${LivePSScript}" -Name $LogName ; Exit }
}
If ( $Path ) { If ( !(Test-Path $Path) ) { Log "The specified script does not exist: ${Path}" -Name $LogName ; Exit } }
If ( ($HaltIfRunning -ne $null ) -and ($ForceClose) -and ( !(IsAdmin) ) ) { Log "Cannot close dependent apps because this task does not have administrative privileges" -Name $LogName ; Exit }
If ( $HaltIfRunning )
{
    $Halt = $false
    Log "Checking for running instances of the following dependent apps:" -Name $LogName
    ForEach ( $name in $HaltIfRunning)
    {
        $RunningInstances = Get-Process | Where { $_.Name -like "${name}" }
        If ( $RunningInstances )
        {
            If ( $ForceClose -eq $true )
            {
                Try { $name | Stop-Process -Force }
                Catch { $_.Exception.Message | Log -Name $LogName ; Exit }
                Log "    ""${name}"" (force closed)" -Name $LogName
            }
            Else { $Halt = $true ; Log "    ""${name}"" (running)" -Name $LogName }
        }
        Else { Log "    ""${name}"" (not running)" -Name $LogName }
    }
    If ( $Halt -eq $true ) { Log "Dependent apps are currently in use and are preventing the specified script from running" -Name $LogName ; Exit }
}
switch ($PSCmdlet.ParameterSetName)
{
    'live-ps'
    {
        Log "Retrieving : ${LivePSScript}.ps1" -Name $LogName
        Try { $Script = (New-Object Net.WebClient).DownloadString($URL) }
        Catch { $_.Exception.Message | Log -Name $LogName ; Exit }
        Try { $ScriptBlock = [Scriptblock]::Create($Script) }
        Catch { $_.Exception.Message | Log -Name $LogName ; Exit }
        Log "Executing: ${LivePSScript}.ps1 ${Arguments}"
        Try { Invoke-Command -ScriptBlock $ScriptBlock -ArgumentList $Arguments }
        Catch { $_.Exception.Message | Log -Name $LogName ; Exit }
    }

    'local'
    {
        Log "Executing: ${Path} ${Arguments}" -Name $LogName
        Try
        {
            If ( $NoWait ) { Start-Process "${Path}" -ArgumentList "{$Arguments}" }
            Else
            {
                Log "    Waiting for script to finish..." -Name $LogName
                Start-Process "${Path}" -ArgumentList "{$Arguments}" -Wait
                Log "    Finished" -Name $LogName
            }
        }
        Catch { $_.Exception.Message | Log -Name $LogName ; Exit }
    }
}
}

## Function to return a Powershell version object from a string
Function Get-Version
{
param([Parameter(Mandatory=$true)][string]$Version)
[int]$Sets = 4
$VersionArray = $Version.Split('.')
If ( $VersionArray.Count -le $Sets ) { $Sets = $VersionArray.Count }
For ($i = 0; $i -le ($Sets - 1); $i++)
{ $Return = '{0}.{1}' -f $Return, $VersionArray[$i] }
Return [version]$Return.Trim('.')
}

## Determines whether a URL is valid
Function IsURLValid
{
param([Parameter(Mandatory=$true,ValueFromPipeline=$true)][string]$URL)
$HTTPRequest = [System.Net.WebRequest]::Create($URL)
$HTTPResponse = $HTTPRequest.GetResponse()
$HTTPStatus = [int]$HTTPResponse.StatusCode
$HTTPResponse.Close()
If ($HTTPStatus -eq 200) { Return $true }
Else { Return $false }
}

## Function to compare current Windows version with a supplied version
## The value supplied must be a string and must include at least 1 decimal
Function IsWindowsVersion
{
param(
    [Parameter(Mandatory=$true,ParameterSetName='gt')][string]$gt,
    [Parameter(Mandatory=$true,ParameterSetName='ge')][string]$ge,
    [Parameter(Mandatory=$true,ParameterSetName='lt')][string]$lt,
    [Parameter(Mandatory=$true,ParameterSetName='le')][string]$le,
    [Parameter(Mandatory=$true,ParameterSetName='eq')][string]$eq
)
[version]$WindowsVersion = [System.Environment]::OSVersion.Version
switch ($PSCmdlet.ParameterSetName)
{
    'gt' { If ( $WindowsVersion -gt (Get-Version $gt) ) { Return $true } Else { Return $false } }
    'ge' { If ( $WindowsVersion -ge (Get-Version $ge) ) { Return $true } Else { Return $false } }
    'lt' { If ( $WindowsVersion -lt (Get-Version $lt) ) { Return $true } Else { Return $false } }
    'le' { If ( $WindowsVersion -le (Get-Version $le) ) { Return $true } Else { Return $false } }
    'eq' { If ( $WindowsVersion -eq (Get-Version $eq) ) { Return $true } Else { Return $false } }
}
}

## Function to compare current Windows build with a supplied version
## The value supplied must be an int
Function IsWindowsBuild
{
param(
    [Parameter(Mandatory=$true,ParameterSetName='gt')][int]$gt,
    [Parameter(Mandatory=$true,ParameterSetName='ge')][int]$ge,
    [Parameter(Mandatory=$true,ParameterSetName='lt')][int]$lt,
    [Parameter(Mandatory=$true,ParameterSetName='le')][int]$le,
    [Parameter(Mandatory=$true,ParameterSetName='eq')][int]$eq
)
[int]$WindowsBuild = [System.Environment]::OSVersion.Version.Build
switch ($PSCmdlet.ParameterSetName)
{
    'gt' { If ( $WindowsBuild -gt $gt ) { Return $true } Else { Return $false } }
    'ge' { If ( $WindowsBuild -ge $ge ) { Return $true } Else { Return $false } }
    'lt' { If ( $WindowsBuild -lt $lt ) { Return $true } Else { Return $false } }
    'le' { If ( $WindowsBuild -le $le ) { Return $true } Else { Return $false } }
    'eq' { If ( $WindowsBuild -eq $eq ) { Return $true } Else { Return $false } }
}
}

## Function to determine if the system is 64-bit or not
Function Is64bit
{
switch ( $(Get-CimInstance -ClassName Win32_OperatingSystem -Property OSArchitecture | Select-Object -ExpandProperty OSArchitecture) )
{ '64-bit' { Return $true } '32-bit' { Return $false } }
}

## Function to determine if the Powershell process is 64-bit or not
Function Is64bitShell
{ If ( [Environment]::Is64BitProcess ) { Return $true } Else { Return $false } }