<#
Author: Gabe Kerntke
Date: 03-06-2024

.Synopsis

.Modified
2024-03-06 (GabeK) - Original script created
2025-08-09 (GabeK) - Updated to use functions script
#>

[CmdletBinding()]
Param(
    [Parameter(Mandatory = $false)]
    $App_Name = "Teams",
    [Parameter(Mandatory = $false)]
    $File_Name_Extension = "exe",
    [Parameter(Mandatory = $false)]
    $Install_Parameters = "-p" ,
    [Parameter(Mandatory = $false)]
    $EPCache_Folder = "3rd Party Patches\$App_Name",
    [Parameter(Mandatory = $false)]
    $File_Name = "$App_Name.$File_Name_Extension",
    [Parameter(Mandatory = $false)]
    $users = (Get-ChildItem -path c:\users).name,
    [Parameter(Mandatory = $false)]
    $CurrentUser = ((get-ciminstance win32_computersystem | ForEach-Object username) -split '\\')[1]
)

$initialURL = "https://learn.microsoft.com/en-us/microsoftteams/new-teams-bulk-install-client"
# Download the HTML content
$html = (New-Object System.Net.WebClient).DownloadString("$initialURL")
	
# Split the content on ">" and "<" characters to extract the text content
$text = $html.Split([char[]]@(">", "<"), [StringSplitOptions]::RemoveEmptyEntries)
	
# Sort the start and end index of the page
$startIndex = $text.IndexOf("Option 1A: Download and install new Teams for a single computer")
$endIndex = $text.IndexOf("Option 1B: Download and install new Teams using an offline installer")
	
# Extract the rows
$rows = $text[$startIndex..$endIndex]

# Filter out only the rows containing version numbers
$Sort = $rows | Where-Object { $_ -match "https" }
$Split = $Sort.split() | Select-Object -First 2 | Select-Object -Last 1 
$DownloadURL = $Split.Substring(5) -replace '"', ""

#Region Functions

Function Uninstall-Teams {
    Stop-Process -name *teams* -Force -ErrorAction SilentlyContinue -Verbose
    Start-Sleep 10
    $Applist = Get-Software | Where-Object { $_.DisplayName -like "*$Name*" }
    $Uninstall = Get-WmiObject Win32_Product -filter "name like 'Teams%'" | ForEach-Object { $_.Uninstall() } -Verbose -ErrorAction SilentlyContinue
    $Value = $Uninstall | Select-Object -ExpandProperty ReturnValue
    
    If ($Value -eq "0") {
        Write-Host "Successfull uninstall via WmiObject"
        Remove-TeamsFolder
    }
    ElseIf ($null -eq $Applist) {
        Remove-TeamsFolder
    }
    Else {
        $UninstallPath = $Applist | Select-Object -ExpandProperty PSPath
        $B = $UninstallPath -replace "Microsoft.PowerShell.Core", ""
        $C = $B.Substring(1)
        Remove-Item -Path $C -Force
        Start-Sleep 5
        Remove-TeamsFolder
    }
}

Function Remove-TeamsFolder {
    $ErrorActionPreference = "SilentlyContinue"

    trap {
        $message = $Error[0].Exception.Message
        #If ($message) {
        #Write-Host -Object "Error: $message" -ForegroundColor Red
        #   }
        #exit -1        
    }
    Get-AppxPackage -name *Teams* -AllUsers | Select-Object -ExpandProperty PackageFullName | Remove-AppxPackage -AllUsers -ErrorAction SilentlyContinue

    Get-ChildItem "C:\Program Files\WindowsApps" | Where-Object { $_.Name -like "*Teams*" } | Remove-Item -Force -Recurse -ErrorAction SilentlyContinue

    $programData = "$($env:ProgramData)\$($_.Name)\Microsoft\Teams"
    If (Test-Path "$($programData)\Current\Teams.exe") {
        Start-Process -FilePath "$($programData)\Current\Teams.exe" -ArgumentList "--uninstall /s" -PassThru -Wait
        Remove-Item "$($env:ProgramData)\$($_.Name)\Microsoft\Teams" -Force -Recurse
    }

    $users = Get-ChildItem C:\Users
    foreach ($user in $users) {
        $path = "C:\Users\$($user.Name)\AppData\Local\Microsoft\Teams"
        If (Test-Path $path) {
            Remove-Item $path -Force -Recurse
        }
    }
    RegDelete 
}

Function RegDelete {
    New-PSDrive -PSProvider Registry -Name HKU -Root HKEY_USERS -ErrorAction SilentlyContinue | Out-Null

    foreach ($user in $users) {
        If ($user -eq $currentuser) { continue; }
        reg load "hku\$user" "C:\Users\$user\NTUSER.DAT" | Out-Null
        # Do whatever you need with "hkey_users\$user" here which links to each users' HKU
        If (Test-Path "HKU:$user\Software\Microsoft\Windows\CurrentVersion\Uninstall") {
            Get-ChildItem "HKU:$user\Software\Microsoft\Windows\CurrentVersion\Uninstall" | Where-Object { $_ -like "*Teams*" } | Remove-Item -Force -Recurse -Verbose -ErrorAction SilentlyContinue
            Start-Sleep 5
        }
    }

    foreach ($user in $users) {
        If ($user -eq $currentuser) { continue; }
        Start-Sleep 5
        reg unload "hku\$user" | Out-Null
    }

    $Keys = Get-ChildItem "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\" -Recurse
    $SIDs = $Keys.PSChildName
    foreach ($SID in $SIDs) {
        If (Test-Path "HKU:\$SID\Software\Microsoft\Windows\CurrentVersion\Uninstall") {
            Get-ChildItem "HKU:\$SID\Software\Microsoft\Windows\CurrentVersion\Uninstall" | Where-Object { $_ -like "*Teams*" } | Remove-Item -Force -Recurse -Verbose -ErrorAction SilentlyContinue
        }
        If (Test-Path "HKU:\$SID\Software\Microsoft\Windows\CurrentVersion\Uninstall\*teams*") {
            Write-Host "Teams uninstall key for $SID still exists."
        }
    }
    <#
    Foreach ($Key in $Keys) {
        If (($key.GetValueNames() | ForEach-Object { $key.GetValue($_) }) -match "\b$CurrentUser\b" ) { $sid = $key }
    }

    $sid = $sid.pschildname

    If (Test-Path "HKU:\$sid\Software\Microsoft\Windows\CurrentVersion\Uninstall") {
        Get-ChildItem "HKU:\$sid\Software\Microsoft\Windows\CurrentVersion\Uninstall" | Where-Object { $_ -like "*Teams*" } | Remove-Item -Force -Recurse -ErrorAction SilentlyContinue
    }
    else { Write-Host "No Teams reg key under currently signed in user $CurrentUser" }
    #>
}

#Region Script Start
If ((Test-Path "C:\Temp\Script Cache") -eq $False) { New-Item -ItemType directory -Path "C:\Temp\Script Cache" }
Invoke-WebRequest -UseBasicParsing "https://scripts.gabesville.com/Gabesville/Powershell-Scripts/raw/branch/main/Functions%20Scripts/Functions.ps1" -outfile "C:\Temp\Script Cache\Functions.ps1"
. "C:\Temp\Script Cache\Functions.ps1"

Close-App
Uninstall-Teams
Test-Probe_Online
Install-App
#Region Script End