<#
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
    $Uninstall = Get-WmiObject Win32_Product -filter "name like 'Teams%'" | ForEach-Object { $_.Uninstall() }
    $Value = $Uninstall | Select-Object -ExpandProperty ReturnValue
    
    If ($Value -eq "0") {
        Write-Host "$App_Name uninstalled successfully, proceeding to deleting user's appdata folders"
        DeleteTeamsFolder
    }
    else {
        Uninstall-Teams2
    }
}

Function Uninstall-Teams2 {
    $UninstallPath = $Applist | Select-Object -ExpandProperty PSPath
    $B = $UninstallPath -replace "Microsoft.PowerShell.Core", ""
    $C = $B.Substring(1)
    Remove-Item -Path $C -Force -Verbose
    Start-Sleep 5
    If ($Applist.DisplayName -like "*$App_Name*") {
        Write-Host "Failed to uninstall $App_Name, exiting script"
    }
    Else {
        Write-Host "$App_Name uninstalled successfully, proceeding to deleting user's appdata folders"
        DeleteTeamsFolder
    }

}

Function DeleteTeamsFolder {
    Get-AppxPackage -name *Teams* -AllUsers | Select-Object -ExpandProperty PackageFullName | Remove-AppxPackage -AllUsers -ErrorAction SilentlyContinue -Verbose
    $users = Get-ChildItem C:\Users
    foreach ($user in $users) {
        $path = "C:\Users\$($user.Name)\AppData\Local\Microsoft\Teams"
        If (Test-Path $path) {
            Remove-Item $path -Force -Recurse
            Write-Output "$user Team's Appdata folder has been deleted, proceeding to install Teams"
        } 
    }
    Test-Probe_Online
    Install-App
}

#Check to see if program is installed
Function CheckforClassicTeams {
    $users = Get-ChildItem C:\Users
    foreach ($user in $users) {
        $Path = Test-Path "C:\Users\$($user.Name)\AppData\Local\Microsoft\Teams\current\Teams.exe"
        If ($Path -eq $true) {
            Stop-Process -name *teams* -Force -ErrorAction SilentlyContinue -Verbose
            Start-Sleep 10
            Write-Host "Teams Classic is installed for $user, proceeding with deleting user appdata folder"
            DeleteTeamsFolder
        }
        Else {
            Write-Host "Teams is not installed for $user, exiting script"
        }
    }
}

#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"

#Check if Teams Machine-Wide Installer is installed
$App_Name = "Teams Machine-Wide Installer"
$Applist = Get-Software | Where-Object { $_.DisplayName -like "*$App_Name*" }

If ($Applist.DisplayName -like "*$App_Name*") {
    Write-Host "$App_Name is already installed, proceeding with uninstall"
    Close-App
    Uninstall-Teams
}
Else {
    Write-Host "$App_Name is not installed, proceeding to check under user's appdata folder for Classic Teams"
    CheckforClassicTeams
}

#Region Script End