param(
    [Parameter(Mandatory = $true)]
    [string]$Drive,
    [Parameter(Mandatory = $true)]
    [string]$NetworkPath,
    [Parameter(Mandatory = $true)]
    [string]$ApprovedServers,
    [int]$MaximumDelayInSeconds = 0
)

[int]$mappedCount = 0
[string]$mappedDrives = ""
if ($MaximumDelayInSeconds -lt 0 -or $MaximumDelayInSeconds -ge 600) {
    throw "MaximumDelayInSeconds must be between 0 and 599."
}
if ($MaximumDelayInSeconds -gt 0) {
    $delay = Get-Random -Minimum 0 -Maximum ($MaximumDelayInSeconds + 1)
    Start-Sleep -Seconds $delay
}
$driveLetters = $Drive.Split(',') | ForEach-Object {
    $_.Trim().TrimEnd(':').ToUpper()
}
$networkPaths = $NetworkPath.Split(',') | ForEach-Object {
    $_.Trim()
}
if ($driveLetters.Count -ne $networkPaths.Count) {
    throw "The number of drive letters must match the number of network paths."
}
for ($i = 0; $i -lt $driveLetters.Count; $i++) {
    $driveLetter = $driveLetters[$i]
    $sharePath = $networkPaths[$i]
    if ($driveLetter -notmatch '^[A-Z]$') {
        throw "Invalid drive letter '$driveLetter'."
    }
    if ($sharePath -notmatch '^\\\\[^\\]+\\[^\\]+') {
        throw "Invalid UNC path '$sharePath'."
    }
    $serverName = ($sharePath -replace '^\\\\([^\\]+).*', '$1').ToUpper()
    if ($serverName -notin $approvedServerList) {
        throw "Server '$serverName' is not in the approved server list."
    }
    $existingPsDrive = Get-PSDrive | Where-Object {
        $_.Name -eq $driveLetter
    }
    if ($null -ne $existingPsDrive) {
        Remove-PSDrive -Name $driveLetter -Force
    }
    $existingNetworkDrive = Get-CimInstance -ClassName Win32_LogicalDisk |
        Where-Object {
            $_.DriveType -eq 4 -and
            $_.DeviceID -eq "$driveLetter`:"
        }
    if ($null -ne $existingNetworkDrive) {
        $deleteOutput = cmd.exe /c "net use $driveLetter`: /delete /y"
        if ($LASTEXITCODE -ne 0) {
            throw "Failed to remove existing mapping for drive $driveLetter. Output: $deleteOutput"
        }
    }
    New-PSDrive `
        -Name $driveLetter `
        -PSProvider FileSystem `
        -Root $sharePath `
        -Persist `
        -Scope Global | Out-Null
    $mappedCount++
    $mappedDrives += "$driveLetter`:->$sharePath; "
}

Write-Output "MappedCount: $mappedCount"
Write-Output "MappedDrives: $mappedDrives"