# Install skills/<name>/ into ~\.claude\skills\<name>\ (or $env:CLAUDE_SKILLS_DIR)
# Usage: install.ps1 [-Names <name1>,<name2>] [-Prune]
#   no args        = install all skills/* into target
#   -Prune         = after install, remove target/<name>/ dirs that are NOT in skills/*
#                    (prune always scans full target, ignores -Names filter — it's a global cleanup)
#
# PowerShell port of install.sh — same behavior, native cmdlets, no bash dependency.

[CmdletBinding()]
param(
    [string[]]$Names = @(),
    [switch]$Prune
)

$ErrorActionPreference = 'Stop'

$root = Split-Path -Parent $PSScriptRoot
$src  = Join-Path $root 'skills'

if ($env:CLAUDE_SKILLS_DIR) {
    $target = $env:CLAUDE_SKILLS_DIR
} else {
    $target = Join-Path $env:USERPROFILE '.claude\skills'
}

if (-not (Test-Path $target)) {
    New-Item -ItemType Directory -Force -Path $target | Out-Null
}

if ($Names.Count -eq 0) {
    $Names = Get-ChildItem -Path $src -Directory | Sort-Object Name | Select-Object -ExpandProperty Name
}

foreach ($name in $Names) {
    $srcDir = Join-Path $src $name
    $dstDir = Join-Path $target $name
    if (-not (Test-Path $srcDir -PathType Container)) {
        Write-Warning "skip: $name (not found in skills/)"
        continue
    }
    if (-not (Test-Path (Join-Path $srcDir 'SKILL.md'))) {
        Write-Warning "skip: $name (missing SKILL.md)"
        continue
    }
    if (Test-Path $dstDir) {
        Remove-Item -Recurse -Force $dstDir
    }
    Copy-Item -Recurse $srcDir $dstDir
    Write-Host "installed: $name -> $dstDir"
}

if ($Prune) {
    $sourceNames = @(Get-ChildItem -Path $src -Directory | Select-Object -ExpandProperty Name)
    $installedDirs = Get-ChildItem -Path $target -Directory -ErrorAction SilentlyContinue
    foreach ($dir in $installedDirs) {
        if ($sourceNames -notcontains $dir.Name) {
            Write-Host "pruning: $($dir.Name) (not in skills/) -> $($dir.FullName)"
            Remove-Item -Recurse -Force $dir.FullName
        }
    }
}