?. (Join-Path (Split-Path -Parent $MyInvocation.MyCommand.Definition) "encoding_policy_resolver_v1.0.ps1")

function Normalize-Newlines([string]$s,[ValidateSet("CRLF","LF")]$Style="CRLF"){
  $t=$s -replace "`r`n","`n"; $t=$t -replace "`r","`n"
  if($Style -eq "CRLF"){ return [string]::Join("`r`n",$t -split "`n") } else { return $t }
}

function Get-TargetEncoding([string]$path){
  $profile = Get-ProjectProfile
  $ext = [IO.Path]::GetExtension($path)
  if(-not $ext){ $ext = '' }
  $ext = $ext.ToLowerInvariant()

  $nl  = "CRLF"
  $enc = "UTF8NOBOM"

  switch($ext){
    ".ps1" { if($profile -eq 'SEEDBOX'){ $enc="UTF8BOM" } else { $enc="UTF8NOBOM" }; $nl="CRLF" }
    ".cmd" { $enc="ASCII"; $nl="CRLF" }
    ".bat" { $enc="ASCII"; $nl="CRLF" }
    ".sh"  { $enc="ASCII"; $nl="LF"    }
    default{ $enc="UTF8NOBOM"; $nl="CRLF" }
  }

  return @{Encoding=$enc; NewLine=$nl}
}

function SafeWrite-Text([string]$Path,[string]$Content){
  $pol = Get-TargetEncoding $Path
  $norm = Normalize-Newlines $Content $pol.NewLine

  $encObj = $null
  switch($pol.Encoding){
    "UTF8BOM"   { $encObj=[Text.UTF8Encoding]::new($true) }
    "UTF8NOBOM" { $encObj=[Text.UTF8Encoding]::new($false) }
    "ASCII"     { $encObj=[Text.ASCIIEncoding]::new() }
    default     { $encObj=[Text.UTF8Encoding]::new($false) }
  }

  $bak = $Path + '.bak_' + (Get-Date -Format 'yyyyMMdd_HHmmss')
  if(Test-Path $Path){ Copy-Item -LiteralPath $Path -Destination $bak -Force }
  $tmp = $Path + '.tmp'
  [IO.File]::WriteAllText($tmp,$norm,$encObj)
  $shaTmp   = (Get-FileHash -Algorithm SHA256 -LiteralPath $tmp).Hash
  Move-Item -LiteralPath $tmp -Destination $Path -Force
  $shaFinal = (Get-FileHash -Algorithm SHA256 -LiteralPath $Path).Hash
  return @{bak=$bak; shaTmp=$shaTmp; shaFinal=$shaFinal; policy=$pol}
}