<#
.SYNOPSIS
Clears the cache for Microsoft Teams (New Client).

.DESCRIPTION
This script sets the variable $cacheCleared to $false, indicating that the cache has not been cleared yet.

.PARAMETER cacheCleared
A boolean variable that indicates whether the cache has been cleared or not.

.PARAMETER logFilePath
Specifies the path where the log file will be created.

.PARAMETER errorFilePath
Specifies the path where the error file will be created.

.EXAMPLE
Clear-NewTeamsCache.ps1 -logFilePath "C:\Logs\CacheLog.txt" -errorFilePath "C:\Logs\ErrorLog.txt"
Clears the cache for Microsoft Teams and creates a log file at the specified path.

.DISCLAIMER
This script is provided as-is without any warranty or support. Use it at your own risk.
The author and Microsoft shall not be liable for any damages or losses arising from the use of this script.

.NOTES
Author: Bhargav Shukla
Date: 01/29/2024
#>

param (
    [bool]$cacheCleared = $false,
    [string]$logFilePath = "C:\Logs\CacheLog.txt",
    [string]$errorFilePath = "C:\Logs\ErrorLog.txt"
)

# Define cache folder paths
$newCacheFolder = "$env:userprofile\appdata\local\Packages\MSTeams_8wekyb3d8bbwe\LocalCache\Microsoft\MSTeams"
$classicCacheFolder = "$env:userprofile\appdata\roaming\Microsoft\Teams"

# Function to create a file if it doesn't exist
function Create-FileIfNotExists {
    param (
        [string]$filePath
    )

    if (-not (Test-Path -Path $filePath)) {
        New-Item -Path $filePath -ItemType File -Force | Out-Null
    }
}

# Function to clear cache
function Clear-Cache {
    param (
        [string]$cacheFolder
    )

    Remove-Item -Path $cacheFolder\* -Force -Recurse
    Write-Host "Cache cleared from $cacheFolder"
    Add-Content -Path $logFilePath -Value "$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss') - Cache cleared from $cacheFolder"
}

# Create log and error files if they don't exist
Create-FileIfNotExists -filePath $logFilePath
Create-FileIfNotExists -filePath $errorFilePath

# Prompt user to clear cache or defer
$choice = Read-Host "Do you want to clear the Teams cache now? (Y/N)"

if ($choice -eq "Y" -or $choice -eq "y") {
    try {
        # Check which version of Teams client is running
        $teamsProcess = Get-Process -Name "MS-Teams" -ErrorAction SilentlyContinue
        if ($teamsProcess -eq $null) {
            $teamsProcess = Get-Process -Name "Teams" -ErrorAction SilentlyContinue
        }

        if ($teamsProcess -ne $null) {
            # Quit Teams application
            Stop-Process -Id $teamsProcess.Id -Force

            # Delete cache files based on the client version
            if ($teamsProcess.Name -eq "MS-Teams") {
                Clear-Cache -cacheFolder $newCacheFolder
            }
            else {
                Clear-Cache -cacheFolder $classicCacheFolder
            }

            # Notify user to start Teams
            Write-Host "Teams cache cleared. You can now start Teams."

            # Log the action
            Add-Content -Path $logFilePath -Value "$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss') Cache Cleared"
        }
        else {
            # Clear cache if Teams is not running
            $clientMessage = "Teams application is not running."
            Write-Host $clientMessage
            Add-Content -Path $logFilePath -Value "$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss') - $clientMessage"

            # Verify existence of cache folder(s) and clear cache
            if (Test-Path -Path $newCacheFolder) {
                Clear-Cache -cacheFolder $newCacheFolder
            }
            else {
                Clear-Cache -cacheFolder $classicCacheFolder
            }
        }
    }
    catch {
        # Log error if cache clearing fails
        $errorMessage = "Failed to clear cache. Error: $($_.Exception.Message)"
        Write-Host $errorMessage
        Add-Content -Path $logFilePath -Value "$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss') - $errorMessage"
    }
    finally {
        # Perform cleanup operations here if needed
    }
}
else {
    # Log the action
    Add-Content -Path $logFilePath -Value "$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss') - Cache Clearing Deferred"
}