#Requires -RunAsAdministrator
<#
.SYNOPSIS
Installs prerequisites for SharePoint XLS Converter application
#>

# Enable TLS 1.2 for secure connections
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

Write-Host "Installing required modules..." -ForegroundColor Cyan

# Install PnP.PowerShell module if not exists
if (-not (Get-Module -ListAvailable -Name PnP.PowerShell)) {
    try {
        Install-Module PnP.PowerShell -Scope CurrentUser -Force -AllowClobber
        Write-Host "PnP.PowerShell module installed successfully" -ForegroundColor Green
    }
    catch {
        Write-Host "Failed to install PnP.PowerShell: $_" -ForegroundColor Red
        exit 1
    }
}
else {
    Write-Host "PnP.PowerShell module is already installed" -ForegroundColor Yellow
}

# Check for Excel installation
try {
    $excelCheck = New-Object -ComObject Excel.Application -ErrorAction Stop
    $excelCheck.Quit()
    [System.Runtime.Interopservices.Marshal]::ReleaseComObject($excelCheck) | Out-Null
    Write-Host "Microsoft Excel is installed" -ForegroundColor Green
}
catch {
    Write-Host @"
    Microsoft Excel not found! The conversion feature requires:
    1. Microsoft Excel 2013 or newer
    2. PowerShell must run in STA mode
    Run the main script like this:
    powershell.exe -STA -File .\MainForm.ps1
"@ -ForegroundColor Red
    exit 1
}

Write-Host @"
Installation complete! Run the main application with:
powershell.exe -STA -File .\MainForm.ps1

Note: First run might take longer while modules load
"@ -ForegroundColor Green