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# archive-utils.ps1 — archive utilities =======================================

# Extract an archive into a destination directory.
#
# Uses Windows tar.exe (ships with Win10 1803+) for all common formats.
#
# Supported formats:
#   .zip, .tar, .tar.gz / .tgz, .tar.bz2, .tar.xz, .tar.zst
#
# Flags:
#   -Cleanup   fix redundant foo/foo/ nesting inside the extracted folder
#   -Flat      extract directly into dest, no subfolder created
#
# Examples:
#   extract archive.tar.gz
#   extract release.zip . -Cleanup
#   extract tools.tar.xz C:\tools -Flat
function Invoke-Extract {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory, Position = 0)]
        [string]$Archive,

        [Parameter(Position = 1)]
        [string]$Dest = ".",

        [switch]$Cleanup,
        [switch]$Flat,

        [Alias('h')]
        [switch]$Help
    )

    if ($Help) { $MyInvocation.MyCommand | Get-Help; return }

    # Verify tar is available
    $TarExe = "$env:SystemRoot\System32\tar.exe"
    if (-not (Test-Path $TarExe)) {
        Write-Error "extract: tar.exe not found at '$TarExe'. Windows 10 1803+ required."
        return
    }

    # Resolve paths
    $File = (Resolve-Path $Archive -ErrorAction Stop).Path
    $Out = (Resolve-Path $Dest    -ErrorAction Stop).Path

    # Detect format
    $Lower = $File.ToLower()
    $Supported = @('.zip', '.tar', '.tar.gz', '.tgz', '.tar.bz2', '.tar.xz', '.tar.zst')
    $Matched = $Supported | Where-Object { $Lower.EndsWith($_) }

    if (-not $Matched) {
        $Ext = [System.IO.Path]::GetExtension($File)
        Write-Error "extract: unsupported format '$Ext'. Supported: $($Supported -join ', ')"
        return
    }

    # Derive stem for output folder
    $BaseName = [System.IO.Path]::GetFileName($File)
    $Compounds = @('.tar.gz', '.tar.bz2', '.tar.xz', '.tar.zst', '.tgz')
    $Stem = $BaseName

    foreach ($C in $Compounds) {
        if ($BaseName.ToLower().EndsWith($C)) {
            $Stem = $BaseName.Substring(0, $BaseName.Length - $C.Length)
            break
        }
    }
    if ($Stem -eq $BaseName) {
        $Stem = [System.IO.Path]::GetFileNameWithoutExtension($BaseName)
    }

    # Prepare target directory
    $Target = if ($Flat) { $Out } else { Join-Path $Out $Stem }
    if (-not $Flat) { New-Item -ItemType Directory -Path $Target -Force | Out-Null }

    # Extract
    & $TarExe -xf $File -C $Target 2>&1 | ForEach-Object {
        if ($_ -match 'error|failed|cannot') { Write-Warning $_ }
    }

    # Cleanup nested foo/foo/
    if ($Cleanup -and -not $Flat) {
        $Inner = Join-Path $Target $Stem
        if ((Test-Path $Inner) -and (Get-Item $Inner).PSIsContainer) {
            $Children = Get-ChildItem -LiteralPath $Inner
            if ($Children) {
                foreach ($Child in $Children) {
                    $DestPath = Join-Path $Target $Child.Name
                    if (Test-Path $DestPath) { Remove-Item $DestPath -Recurse -Force }
                    Move-Item $Child.FullName $DestPath
                }
            }
            Remove-Item $Inner -Force
        }
    }

    Write-Host "Extracted to: " -NoNewline -ForegroundColor Blue
    Write-Host $Target
}

Set-Alias -Name extract -Value Invoke-Extract -Scope Global

# Compress a file or folder into an archive.
#
# Uses Windows tar.exe (ships with Win10 1803+).
# Format is inferred from the output filename extension.
#
# Supported formats:
#   .zip, .tar, .tar.gz / .tgz, .tar.bz2, .tar.xz, .tar.zst
#
# Examples:
#   compress my-folder output.tar.gz
#   compress my-folder output.zip
#   compress file.txt backup.tar.xz
function Invoke-Compress {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory, Position = 0)]
        [string]$Path,

        [Parameter(Mandatory, Position = 1)]
        [string]$Output,

        [Alias('h')]
        [switch]$Help
    )

    if ($Help) { $MyInvocation.MyCommand | Get-Help; return }

    # Verify tar is available
    $TarExe = "$env:SystemRoot\System32\tar.exe"
    if (-not (Test-Path $TarExe)) {
        Write-Error "compress: tar.exe not found at '$TarExe'. Windows 10 1803+ required."
        return
    }

    # Resolve source path
    $Source = (Resolve-Path $Path -ErrorAction Stop).Path

    # Detect format from output extension
    $Lower = $Output.ToLower()
    $Supported = @('.zip', '.tar', '.tar.gz', '.tgz', '.tar.bz2', '.tar.xz', '.tar.zst')
    $Matched = $Supported | Where-Object { $Lower.EndsWith($_) }

    if (-not $Matched) {
        $Ext = [System.IO.Path]::GetExtension($Output)
        Write-Error "compress: unsupported format '$Ext'. Supported: $($Supported -join ', ')"
        return
    }

    # Resolve output to absolute path
    $OutFile = $Output
    if (-not [System.IO.Path]::IsPathRooted($OutFile)) {
        $OutFile = Join-Path (Get-Location).Path $OutFile
    }

    # Compress
    & $TarExe -cf $OutFile -C (Split-Path $Source -Parent) (Split-Path $Source -Leaf) 2>&1 | ForEach-Object {
        if ($_ -match 'error|failed|cannot') { Write-Warning $_ }
    }

    Write-Host "Compressed to: " -NoNewline -ForegroundColor Blue
    Write-Host $OutFile
}

Set-Alias -Name compress -Value Invoke-Compress -Scope Global