# FaceNinja skill installer 1.0.0 for Windows PowerShell. It copies the skill folder (SKILL.md, scripts\faceninja.py,
# reference\api.md, README.md) into the skills folder of each AI agent it finds and changes nothing else.
#
#   irm https://faceninja.net/skill/install.ps1 | iex                                              every agent found
#   & ([scriptblock]::Create((irm https://faceninja.net/skill/install.ps1))) -Claude               only Claude Code
#       -Codex   -Cursor (.\.cursor\skills)   -Agents (.\.agents\skills)   -Dir PATH   -AgentsMd (add a line to .\AGENTS.md)
param([switch]$Claude, [switch]$Codex, [switch]$Cursor, [switch]$Agents, [string]$Dir, [switch]$AgentsMd)
$ErrorActionPreference = 'Stop'
$ProgressPreference = 'SilentlyContinue'

$base = if ($env:FACENINJA_API_BASE) { $env:FACENINJA_API_BASE.TrimEnd('/') } else { 'https://faceninja.net' }
# SHA-256 of each file, written by tools/skill/build.mjs; a download that does not match is refused
$sums = [ordered]@{
  'SKILL.md' = 'e5042de77212ea11a0e93954d4e6733fe828481c270d0570d478792f982f9fdd'
  'README.md' = '817bb11ae1244a32ff55d8ac10e0f19ab5e33565b7842dec3a0b3fece27a1bbb'
  'scripts/faceninja.py' = '561461d99e29f4251ac76e31cee0f1fcbe7112c829c0481d52fd8505a60e6135'
  'reference/api.md' = '5ba682b2b97c4144ccf20d1ed447e96dd5abf3742c47f00642b0ed083d4caba6'
}

$targets = New-Object System.Collections.Generic.List[string]
function Add-Target([string]$p) { if (-not $targets.Contains($p)) { $targets.Add($p) } }
$claudeDir = if ($env:CLAUDE_CONFIG_DIR) { $env:CLAUDE_CONFIG_DIR } else { Join-Path $HOME '.claude' }
$codexDir = if ($env:CODEX_HOME) { $env:CODEX_HOME } else { Join-Path $HOME '.codex' }
$here = (Get-Location).Path
if ($Claude) { Add-Target (Join-Path $claudeDir 'skills') }
if ($Codex) { Add-Target (Join-Path $codexDir 'skills') }
if ($Cursor) { Add-Target (Join-Path $here '.cursor\skills') }
if ($Agents) { Add-Target (Join-Path $here '.agents\skills') }
if ($Dir) { Add-Target $Dir }
if ($targets.Count -eq 0) {
  if ($env:CLAUDE_CONFIG_DIR -or (Test-Path (Join-Path $HOME '.claude'))) { Add-Target (Join-Path $claudeDir 'skills') }
  if ($env:CODEX_HOME) { Add-Target (Join-Path $env:CODEX_HOME 'skills') }
  if (Test-Path (Join-Path $HOME '.codex')) { Add-Target (Join-Path $HOME '.codex\skills') }
  if (Test-Path (Join-Path $here '.cursor')) { Add-Target (Join-Path $here '.cursor\skills') }
  if ((Test-Path (Join-Path $here '.agents')) -or $targets.Count -eq 0) { Add-Target (Join-Path $here '.agents\skills') }
}

$tmp = Join-Path ([IO.Path]::GetTempPath()) ('faceninja-skill-' + [guid]::NewGuid())
New-Item -ItemType Directory -Force -Path (Join-Path $tmp 'scripts'), (Join-Path $tmp 'reference') | Out-Null
try {
  foreach ($file in $sums.Keys) {
    $out = Join-Path $tmp $file
    Invoke-WebRequest -UseBasicParsing -Uri "$base/skill/$file" -OutFile $out
    if ((Get-FileHash -Algorithm SHA256 $out).Hash.ToLower() -ne $sums[$file]) { throw "Checksum mismatch for $file; nothing was installed." }
  }
  Write-Host "Installed the FaceNinja skill 1.0.0 to:"
  foreach ($t in $targets) {
    $dest = Join-Path $t 'faceninja'
    New-Item -ItemType Directory -Force -Path (Join-Path $dest 'scripts'), (Join-Path $dest 'reference') | Out-Null
    foreach ($file in $sums.Keys) { Copy-Item -Force (Join-Path $tmp $file) (Join-Path $dest $file) }
    Write-Host "  $dest"
  }
} finally { Remove-Item -Recurse -Force $tmp -ErrorAction SilentlyContinue }

if ($targets.Contains((Join-Path $here '.agents\skills'))) {
  $line = '- FaceNinja (photos to MetaHuman heads): read .agents/skills/faceninja/SKILL.md'
  $agentsFile = Join-Path $here 'AGENTS.md'
  if (-not ((Test-Path $agentsFile) -and (Select-String -Quiet -SimpleMatch '.agents/skills/faceninja/SKILL.md' $agentsFile))) {
    if (-not $AgentsMd -and [Environment]::UserInteractive -and -not [Console]::IsInputRedirected) {
      $AgentsMd = (Read-Host 'Add a line to .\AGENTS.md so agents find the skill? [y/N]') -match '^(y|yes)$'
    }
    if ($AgentsMd) { Add-Content -Path $agentsFile -Value "`n$line"; Write-Host 'Added a line to .\AGENTS.md.' }
    else { Write-Host "Agents that read AGENTS.md find the skill if you add this line there (or rerun with -AgentsMd):`n  $line" }
  }
}
$py = Get-Command python -ErrorAction SilentlyContinue
if (-not $py) { $py = Get-Command py -ErrorAction SilentlyContinue }
if (-not $py) { Write-Host 'Note: the skill needs Python 3.9 or newer (python.org or `winget install Python.Python.3.12`).' }
Write-Host 'Next: ask your agent to use the FaceNinja skill, or run: python <folder above>\scripts\faceninja.py login'