#Requires -Version 5.1
<#
.SYNOPSIS
    Regression tests for install.ps1.

.BUG
    `irm <url> | iex` closed the terminal window. Cause: the script used
    `exit`, which under Invoke-Expression terminates the entire PowerShell
    host process (there is no script scope to exit). Fix: use `return`
    (success) / `throw` (errors) so the host survives.

.NOTES
    Host-process termination cannot be observed from inside the dying process,
    so these tests combine a source-verification guard with a behavioral test
    run in a child process (`exit` cannot be caught by try/catch and kills the
    child; `throw` is catchable).
#>
[CmdletBinding()]
param()

Set-StrictMode -Version Latest
$ErrorActionPreference = "Stop"

$repoRoot      = Split-Path -Parent $PSScriptRoot
$installScript = Join-Path $repoRoot "install.ps1"
$failures      = [System.Collections.Generic.List[string]]::new()

function Assert-True([bool]$Cond, [string]$Message) {
    if (-not $Cond) { $failures.Add($Message) | Out-Null }
}

# --- Test 1 (source verification): no host-terminating `exit` ---
$content   = Get-Content -Path $installScript -Raw
$exitCount = ([regex]::Matches($content, '(?m)^\s*exit\b')).Count
Assert-True ($exitCount -eq 0) "install.ps1 must not use bare 'exit' (found $exitCount); 'irm | iex' would kill the host. Use return/throw."

# --- Test 2: parses cleanly ---
$parseOk = $true
try { [void][scriptblock]::Create($content) } catch { $parseOk = $false }
Assert-True $parseOk "install.ps1 must parse without syntax errors."

# --- Test 3 (behavioral): iex must NOT kill the host ---
# Force the version lookup to fail fast against an unreachable address so the
# script reaches its early-exit/throw path offline. `exit` terminates the child
# (RESULT never emitted); `throw` is caught and RESULT is emitted.
$inner = @'
$ErrorActionPreference = "Stop"
$env:OCTOPUS_DOWNLOAD_BASE = "http://127.0.0.1:1"
$r = "nothing"
try {
    Invoke-Expression (Get-Content -Raw "__INSTALL__")
    $r = "completed"
} catch {
    $r = "caught-throw"
}
Write-Output ("RESULT=$r")
'@.Replace("__INSTALL__", $installScript)

$tmp = Join-Path $env:TEMP ("octopus_iex_test_" + $PID + ".ps1")
Set-Content -Path $tmp -Value $inner -Encoding UTF8
try {
    $childOut = (& powershell -NoProfile -File $tmp 2>&1 | Out-String)
} finally {
    Remove-Item $tmp -ErrorAction SilentlyContinue
}
Assert-True ($childOut -match 'RESULT=') "iex must not terminate the host (try/catch must observe a RESULT). Child output:`n$childOut"

# --- Report ---
if ($failures.Count -gt 0) {
    Write-Host ("FAIL: " + $failures.Count + " test(s)") -ForegroundColor Red
    foreach ($f in $failures) { Write-Host ("  - " + $f) -ForegroundColor Red }
    exit 1
}
Write-Host "PASS: all regression tests passed." -ForegroundColor Green
exit 0