<#
.SYNOPSIS
Query Tanium Gateway (GraphQL) for endpoints and return Computer Name (NetBIOS), Model, and BIOS Version.
Supports pagination, optional filtering from a simple list file (one name per line), Out-GridView, and CSV export.

.DESCRIPTION
- Uses GraphQL operation exampleGetEndpoints with sensors "Model" and "BIOS Version".
- Paginates using pageInfo.hasNextPage / endCursor until all endpoints are collected.
- Optional filtering: provide -ListFile with one computer name per line (NetBIOS or FQDN).
- Normalizes names by taking the part before the first dot and uppercasing (so NetBIOS and FQDN match).
- Reads URL/token from a local config.json if not passed as parameters.
- Optional TLS bypass for lab (-SkipCertCheck or via config.json flag).

.USAGE
# With config.json (same folder): { "TaniumUrl": "tanium.pp.dktinfra.io", "TaniumApiToken": "token-xxxx", "SkipCertificateCheck": true }
./APICheckBiosVersion.ps1 -Count 200 -Time 30 -MaxAge 900 -PageSize 200

# Filter from a list (one name per line, no header)
./APICheckBiosVersion.ps1 -ListFile .\machines.txt

# Grid view and CSV export
./APICheckBiosVersion.ps1 -ListFile .\machines.txt -Grid -ExportCsv C:\Temp\bios.csv

# Raw JSON of aggregated edges
./APICheckBiosVersion.ps1 -Raw

.PARAMETERS
-Url, -Token            Override Tanium URL and API token (otherwise read from config.json).
-Count, -Time, -MaxAge  GraphQL collection knobs (expectedCount, stableWaitTime, maxAge seconds).
-PageSize               Page size for pagination (GraphQL 'first').
-ListFile               Optional path to a simple list (one hostname per line) to filter results.
-Raw                    Output aggregated JSON instead of table/grid.
-Grid                   Show results in Out-GridView (if available).
-Pick                   With -Grid, allow selection and output only the selection.
-ExportCsv              Path to write CSV export.
-SkipCertCheck          Ignore TLS cert validation (lab/dev only).

.NOTES
Requires: PowerShell 5.1+ (Out-GridView on PS7 via Microsoft.PowerShell.GraphicalTools).
#>

param(
  [string]$Url,
  [string]$Token,
  [switch]$SkipCertCheck,

  [int]$Count    = 200,
  [int]$Time     = 30,
  [int]$MaxAge   = 900,
  [int]$PageSize = 200,

  [string]$ListFile,
  [switch]$Raw,
  [switch]$Grid,
  [switch]$Pick,
  [string]$ExportCsv
)

$ErrorActionPreference = 'Stop'
try { [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 } catch {}

# ---------- Helpers ----------
function Get-GatewayUri {
  param([Parameter(Mandatory)][string]$HostLike)
  $h = $HostLike.Trim()
  if ($h -match '^https?://') { $h = $h -replace '^https?://','' }
  $h = $h.TrimEnd('/')
  if ([string]::IsNullOrWhiteSpace($h)) { throw 'TaniumUrl empty after normalization.' }
  "https://$h/plugin/products/gateway/graphql"
}

# TLS bypass for Windows PowerShell 5.1 (temporary, restored after call)
$script:__oldCb = $null
function Enter-InsecureTls { param([switch]$Enable)
  if (-not $Enable) { return }
  $script:__oldCb = [System.Net.ServicePointManager]::ServerCertificateValidationCallback
  $cb = [System.Net.Security.RemoteCertificateValidationCallback]{ param($s,$c,$ch,$e) $true }
  [System.Net.ServicePointManager]::ServerCertificateValidationCallback = $cb
}
function Exit-InsecureTls {
  if ($script:__oldCb -ne $null) {
    [System.Net.ServicePointManager]::ServerCertificateValidationCallback = $script:__oldCb
    $script:__oldCb = $null
  }
}

function Get-HostKey {
  param([string]$Name)
  if ([string]::IsNullOrWhiteSpace($Name)) { return '' }
  $n  = $Name.Trim()
  $nb = ($n -split '\.', 2)[0]   # take part before first dot if FQDN
  return $nb.ToUpperInvariant()
}

function Read-TargetsFromFile {
  param([Parameter(Mandatory)][string]$Path)
  if (-not (Test-Path -LiteralPath $Path)) { throw "List file not found: $Path" }
  $set = New-Object System.Collections.Generic.HashSet[string]
  Get-Content -LiteralPath $Path -Encoding UTF8 | ForEach-Object {
    $line = $_.Trim()
    if (-not [string]::IsNullOrWhiteSpace($line)) { [void]$set.Add((Get-HostKey $line)) }
  }
  if ($set.Count -eq 0) { throw "List file is empty: $Path" }
  return $set
}

function Get-ValuesForSensor {
  param([array]$Columns, [string]$SensorName)
  $match = $Columns | Where-Object { $_.sensor.name -eq $SensorName }
  if (-not $match) { return '' }
  $vals = @()
  foreach ($c in $match) {
    foreach ($v in $c.values) {
      if ($null -ne $v -and ("$v").Trim()) { $vals += ("$v") }
    }
  }
  # de-dup while preserving order
  $uniq = @()
  foreach ($v in $vals) { if (-not $uniq.Contains($v)) { $uniq += $v } }
  return ($uniq -join ' | ')
}

# ---------- Load config if needed ----------
$BaseDir    = if ($PSScriptRoot) { $PSScriptRoot } else { $pwd.Path }
$configPath = Join-Path $BaseDir 'config.json'
if (-not $Url -or -not $Token) {
  if (-not (Test-Path $configPath)) { throw "Missing -Url/-Token and config.json not found: $configPath" }
  $cfg = Get-Content -Path $configPath -Raw | ConvertFrom-Json
  if (-not $Url)   { $Url   = [string]$cfg.TaniumUrl }
  if (-not $Token) { $Token = [string]$cfg.TaniumApiToken }
  if (-not $PSBoundParameters.ContainsKey('SkipCertCheck')) { $SkipCertCheck = [bool]$cfg.SkipCertificateCheck }
}

# ---------- Prepare ----------
$gateway = Get-GatewayUri -HostLike $Url
$headers = @{ 'Content-Type' = 'application/json'; session = $Token }
$targetSet = $null
if ($ListFile) { $targetSet = Read-TargetsFromFile -Path $ListFile }

# ---------- GraphQL (paginated) ----------
$Query = @'
query exampleGetEndpoints($count: Int, $time: Int, $maxAge: Int, $first: Int, $after: Cursor) {
  endpoints(source: { ts: { expectedCount: $count, stableWaitTime: $time, maxAge: $maxAge } }, first: $first, after: $after) {
    edges { node {
      computerID
      name
      serialNumber
      ipAddress
      sensorReadings(sensors: [{name: "Model"}, {name: "BIOS Version"}]) {
        columns { name values sensor { name } }
      }
    }}
    pageInfo { hasNextPage endCursor }
  }
}
'@

$allEdges = New-Object System.Collections.Generic.List[object]
$cursor = $null

while ($true) {
  $variables = @{ count = $Count; time = $Time; maxAge = $MaxAge; first = $PageSize; after = $cursor }
  $bodyObj = @{ query = $Query; variables = $variables; operationName = 'exampleGetEndpoints' }
  $bodyJson = $bodyObj | ConvertTo-Json -Depth 12

  $resp = $null
  $ps7 = ($PSVersionTable.PSVersion.Major -ge 7)
  if ($ps7 -and $SkipCertCheck) {
    $resp = Invoke-RestMethod -SkipCertificateCheck -Method Post -Uri $gateway -Headers $headers -ContentType 'application/json' -Body $bodyJson
  }
  else {
    try { Enter-InsecureTls -Enable:$SkipCertCheck
      $resp = Invoke-RestMethod -Method Post -Uri $gateway -Headers $headers -ContentType 'application/json' -Body $bodyJson
    }
    finally { Exit-InsecureTls }
  }

  if ($resp.errors) { throw ("GraphQL errors: " + (($resp.errors | ForEach-Object { $_.message }) -join '; ')) }

  $edges = $resp.data.endpoints.edges
  if ($edges) { $allEdges.AddRange($edges) }

  $pi = $resp.data.endpoints.pageInfo
  if (-not $pi -or -not $pi.hasNextPage) { break }
  $cursor = $pi.endCursor
}

if ($Raw) {
  [pscustomobject]@{ total = $allEdges.Count; edges = $allEdges } | ConvertTo-Json -Depth 14
  return
}

if ($allEdges.Count -eq 0) { Write-Output 'Aucun endpoint retourné.'; return }

# ---------- Filter (optional) + Output ----------
$rows = foreach ($edge in $allEdges) {
  $n = $edge.node
  $nb = Get-HostKey $n.name
  if ($targetSet -and -not $targetSet.Contains($nb)) { continue }
  $cols = $n.sensorReadings.columns
  [pscustomobject]@{
    Nom          = $nb
    Modèle       = (Get-ValuesForSensor -Columns $cols -SensorName 'Model')
    VersionBIOS  = (Get-ValuesForSensor -Columns $cols -SensorName 'BIOS Version')
  }
}

if (-not $rows) { Write-Output 'Aucun poste correspondant.'; return }
$rowsSorted = $rows | Sort-Object Nom

# Optional CSV export
if ($ExportCsv) {
  try {
    $rowsSorted | Export-Csv -NoTypeInformation -Encoding UTF8 -Path $ExportCsv
    Write-Host "Exported to: $ExportCsv" -ForegroundColor Green
  } catch { Write-Warning "CSV export failed: $($_.Exception.Message)" }
}

# Grid mode
if ($Grid) {
  $title = "BIOS Versions — {0} poste(s)" -f ($rowsSorted.Count)
  if (Get-Command Out-GridView -ErrorAction SilentlyContinue) {
    if ($Pick) {
      $sel = $rowsSorted | Out-GridView -Title $title -PassThru
      if ($sel) { $sel | Format-Table -AutoSize }
      return
    } else {
      $rowsSorted | Out-GridView -Title $title
      return
    }
  } else {
    Write-Warning "Out-GridView n'est pas disponible. Sous PowerShell 7+, installe: Install-Module Microsoft.PowerShell.GraphicalTools"
  }
}

# Default console table
$rowsSorted | Format-Table -AutoSize