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# Detection
try {

    # check the reg key for the taskbar teams app icon
    # Reg2CI (c) 2021 by Roger Zander
    if ( (Get-ItemPropertyValue -LiteralPath 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced' -Name 'TaskbarMn' -ErrorAction Stop ) -eq 0 ) { $RegCompliance = $true }
    else { $RegCompliance = $false } 

    # check if the teams app is installed
    if ($null -eq (Get-AppxPackage -Name MicrosoftTeams) ) { $AppCompliance = $true }
    else { $AppCompliance = $false }
    
    # evaluate the compliance
    if ($RegCompliance -and $AppCompliance -eq $true) {

        Write-Host "Success, app/reg removed"
        exit 0
    }
    else {
        Write-Host "Failure, app/reg detected"
        exit 1
    }
   
    
}
catch {
    $errMsg = _.Exception.Message
    Write-Host $errMsg
    exit 1
}

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# Remediation

try {

    # remove the taskbar icon
    # Reg2CI (c) 2021 by Roger Zander
    if ((Test-Path -LiteralPath "HKCU:\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced") -ne $true) {
        New-Item "HKCU:\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" -Force -ErrorAction Stop 
    }
    New-ItemProperty -LiteralPath 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced' -Name 'TaskbarMn' -Value 0 -PropertyType DWord -Force -ErrorAction Stop
    

    # uninstall the teams consumer app
    Get-AppxPackage -Name MicrosoftTeams | Remove-AppxPackage -ErrorAction stop

    # as nothing errored out, we will report success
    Write-Host "Success, regkey set and app uninstalled"
    exit 0
}

catch {
    $errMsg = _.Exception.Message
    Write-Host $errMsg
    exit 1
}