# VCN #45 Bench - get a Windows machine ready to write an eval for a coding agent.
# Doctor first, then scaffold. Idempotent and safe: it never deletes anything,
# never touches global config, and never installs a system package for you (it
# prints the one line to run instead).
#
# Run:    irm https://vcn-45-bench.vercel.app/wire.ps1 | iex
# Doctor only, changes nothing:
#         & ([scriptblock]::Create((irm https://vcn-45-bench.vercel.app/wire.ps1))) -Check
#
# There are NO credentials in this file. It never prints your key. ASCII only.
# Uninstall: delete the directory it created. Nothing else was touched.

param(
  [switch]$Check,
  [string]$Dir = "bench",
  [switch]$Yes
)

$ErrorActionPreference = "Continue"
$BASE = "https://vcn-45-bench.vercel.app"
$script:Failed = 0

function Ok   ($m) { Write-Host "  OK    $m" }
function Warn ($m) { Write-Host "  WARN  $m" }
function Bad  ($m) { Write-Host "  FAIL  $m"; $script:Failed = 1 }
function Have ($c) { return [bool](Get-Command $c -ErrorAction SilentlyContinue) }

Write-Host ""
Write-Host "VCN #45 Bench - machine doctor"
Write-Host "-----------------------------------------------------------"

Ok "platform: Windows PowerShell $($PSVersionTable.PSVersion)"
if ($PSVersionTable.PSVersion.Major -lt 6) {
  Warn "PowerShell 5.x: '&&' does not chain here. Use ';' or 'a; if (`$?) { b }'"
}

# --- node -----------------------------------------------------------------
if (Have node) {
  $nv = (node -v) -replace '^v',''
  $maj = 0; [void][int]::TryParse(($nv -split '\.')[0], [ref]$maj)
  if ($maj -ge 18) { Ok "node v$nv (>= 18)" }
  else { Bad "node v$nv is too old, need 18+"; Write-Host "        installer: https://nodejs.org" }
} else {
  Bad "node not found, need 18+"
  Write-Host "        installer: https://nodejs.org"
}

if (Have npm) { Ok "npm $(npm -v)" } else { Bad "npm not found (ships with node)" }

# --- claude code ----------------------------------------------------------
if (Have claude) {
  Ok "claude code on PATH"
} else {
  Warn "claude code not found"
  Write-Host "        npm install -g @anthropic-ai/claude-code"
  Write-Host "        if it installs but is still not found, add 'npm bin -g' to PATH"
}

# --- python + pytest (the oracle runtime) --------------------------------
$py = $null
foreach ($c in @("python","python3","py")) { if (Have $c) { $py = $c; break } }
if ($py) {
  Ok "$py $(& $py -c 'import sys;print(""%d.%d""%sys.version_info[:2])' 2>$null)"
  & $py -c "import pytest" 2>$null
  if ($?) { Ok "pytest importable (oracles can run)" }
  else {
    Warn "pytest not installed: your oracle needs SOME test runner"
    Write-Host "        $py -m pip install pytest"
  }
} else {
  Warn "no python found. Fine if your oracle is not python, but the example is."
}

if (Have git) { Ok "git $((git --version) -split ' ' | Select-Object -Last 1)" }
else { Bad "git not found: lab 1 uses git worktree" }

# --- bash availability (for .sh oracles) ---------------------------------
if (Have bash) {
  Ok "bash on PATH (Git Bash): .sh oracles will run"
} else {
  Warn "no bash: a .sh oracle will NOT run natively on Windows"
  Write-Host "        either install Git for Windows, or write oracle.ps1 instead"
  Write-Host "        (the deck's Windows tab shows the PowerShell oracle)"
}

# --- gateway reachability (no key needed, no key sent) -------------------
$gw = "https://immersivecommons13.tail5da903.ts.net/"
try {
  $r = Invoke-WebRequest -Uri $gw -Method Head -TimeoutSec 12 -UseBasicParsing
  Ok "workshop gateway answers (HTTP $($r.StatusCode))"
} catch {
  $code = $null
  if ($null -ne $_.Exception.Response) { $code = [int]$_.Exception.Response.StatusCode }
  if ($null -ne $code) { Ok "workshop gateway answers (HTTP $code; 404 on / is expected)" }
  else { Bad "workshop gateway unreachable (network/DNS/TLS). Tell the facilitator." }
}

# --- env vars -------------------------------------------------------------
if ($env:ANTHROPIC_AUTH_TOKEN) {
  Ok "ANTHROPIC_AUTH_TOKEN is set (value not shown)"
  if ($env:ANTHROPIC_BASE_URL) { Ok "ANTHROPIC_BASE_URL is set" }
  else { Warn "ANTHROPIC_BASE_URL not set: claude will talk to the wrong host" }
} else {
  Warn "ANTHROPIC_AUTH_TOKEN not set yet"
  Write-Host "        request a key: https://immersivecommons.com/zai-keys"
  Write-Host "        then in THIS window:"
  Write-Host '          $env:ANTHROPIC_BASE_URL = "https://immersivecommons13.tail5da903.ts.net"'
  Write-Host '          $env:ANTHROPIC_AUTH_TOKEN = "agt_your_key_here"'
  Write-Host '          $env:ANTHROPIC_MODEL = "glm-4.6"'
  Write-Host '          $env:ANTHROPIC_SMALL_FAST_MODEL = "glm-4.5-air"'
  Write-Host "        full setup: $BASE/setup.txt"
}

Write-Host "-----------------------------------------------------------"
if ($script:Failed -ne 0) {
  Write-Host "Some hard requirements are missing. Fix those first."
  Write-Host "Full setup: $BASE/setup.txt"
  if ($Check) { exit 1 }
}
if ($Check) { Write-Host "Doctor only, nothing changed."; exit 0 }

# --- scaffold -------------------------------------------------------------
Write-Host ""
if (Test-Path $Dir) {
  Write-Host "$Dir already exists, leaving it exactly as it is."
} else {
  if (-not $Yes) {
    $ans = Read-Host "Create the bench skeleton in .\$Dir ? [y/N]"
    if ($ans -notmatch '^(y|yes)$') { Write-Host "Skipped."; exit 0 }
  }
  New-Item -ItemType Directory -Force -Path "$Dir\tasks\001-example", "$Dir\results" | Out-Null

  # NOTE: written with UTF8 and LF-friendly content. If you later hand a .sh to
  # bash, keep it LF or bash reports: bad interpreter: bash^M
  Set-Content -Encoding utf8 "$Dir\tasks\001-example\prompt.md" @'
Replace this with one real task from your own repo.

A good first task is a bug you have ALREADY fixed, so you know the answer:
  1. find the fix commit in your history
  2. check out its parent into this task's repo\ directory
  3. write one sentence here describing what to fix
'@

  Set-Content -Encoding utf8 "$Dir\tasks\001-example\oracle.ps1" @'
# The oracle: exit 0 is pass, anything else is fail. No opinions, no LLM.
$ErrorActionPreference = "Stop"
Set-Location "$PSScriptRoot\repo"
# Point this at the ONE test that decides this task:
pytest tests/test_example.py -q
exit $LASTEXITCODE
'@

  Set-Content -Encoding utf8 "$Dir\probe_oracle.ps1" @'
# Probe an oracle for determinism BEFORE trusting it.
# Two runs on unchanged code must give the SAME exit code.
param([Parameter(Mandatory=$true)][string]$Oracle)
powershell -NoProfile -File $Oracle *> $null; $a = $LASTEXITCODE
powershell -NoProfile -File $Oracle *> $null; $b = $LASTEXITCODE
Write-Host "run1=$a run2=$b"
if ($a -eq $b) {
  Write-Host "DETERMINISTIC (verdict $a). Safe to trust this oracle."
} else {
  Write-Host "FLAKY ORACLE. Fix this before blaming the agent:"
  Write-Host "  every number you compute from it is noise."
  exit 1
}
'@

  Ok "scaffolded .\$Dir (tasks\001-example, probe_oracle.ps1, results\)"
  Write-Host ""
  Write-Host "You write runner.py during lab 3. The code is on the slides:"
  Write-Host "  $BASE  (slide 17, Windows tab)"
  Write-Host "Prose for your agent: $BASE/llms.txt"
}

Write-Host ""
Write-Host "Doors 19:00, walkthrough 19:30, Frontier Tower Floor 10. See you there."