[CmdletBinding()]
param([switch]$Summary)
$ErrorActionPreference = 'Stop'
$root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
$work = Join-Path ([System.IO.Path]::GetTempPath()) ("ai-config-build-validation-" + [Guid]::NewGuid())
New-Item $work -ItemType Directory -Force | Out-Null

function New-RepoCopy {
    $copy = Join-Path $work ("case-" + [Guid]::NewGuid())
    New-Item $copy -ItemType Directory -Force | Out-Null
    Get-ChildItem $root -Force | Where-Object { $_.Name -ne '.git' -and $_.Name -ne 'generated' -and $_.Name -notlike 'generated.*' } | ForEach-Object {
        Copy-Item $_.FullName (Join-Path $copy $_.Name) -Recurse -Force
    }
    return $copy
}

function Test-BuildFails([string]$Label, [scriptblock]$Mutate) {
    $copy = New-RepoCopy
    & $Mutate $copy
    $failed = $false
    try { & (Join-Path $copy 'scripts/commands/build.ps1') 2>&1 | Out-Null }
    catch { $failed = $true }
    $leftovers = @(Get-ChildItem $copy -Force -Filter 'generated*')
    Remove-Item $copy -Recurse -Force -ErrorAction SilentlyContinue
    if (-not $failed) { throw "Expected build to fail for case '$Label' but it succeeded." }
    if ($leftovers.Count) { throw "Failed build for case '$Label' left output behind: $($leftovers.Name -join ', ')" }
}

$baseline = New-RepoCopy
& (Join-Path $baseline 'scripts/commands/build.ps1') -Summary | Out-Null
$baselineGenerated = Join-Path $baseline 'generated'
$expectedFiles = @(Get-ChildItem $baselineGenerated -File -Recurse | ForEach-Object { $_.FullName.Substring($baselineGenerated.Length) } | Sort-Object)
$builds = @(1, 2 | ForEach-Object {
    $build = Start-Process (Get-Process -Id $PID).Path -ArgumentList @('-NoProfile', '-ExecutionPolicy', 'Bypass', '-File', ('"' + (Join-Path $baseline 'scripts/commands/build.ps1') + '"'), '-Summary') -NoNewWindow -PassThru -RedirectStandardOutput (Join-Path $work "parallel-$_.out") -RedirectStandardError (Join-Path $work "parallel-$_.err")
    $null = $build.Handle # Windows PowerShell 5.1 reports ExitCode only when the handle was opened.
    $build
})
foreach ($build in $builds) { $build.WaitForExit() }
foreach ($index in 0, 1) {
    if ($builds[$index].ExitCode -ne 0) { throw "Parallel build $($index + 1) failed: $(Get-Content (Join-Path $work "parallel-$($index + 1).err") -Raw)" }
}
$actualFiles = @(Get-ChildItem $baselineGenerated -File -Recurse | ForEach-Object { $_.FullName.Substring($baselineGenerated.Length) } | Sort-Object)
if (Compare-Object $expectedFiles $actualFiles) { throw 'generated/ is incomplete after two parallel builds.' }
if (@(Get-ChildItem $baseline -Force | Where-Object Name -like 'generated.*').Count) { throw 'Parallel builds left a build directory, retired tree, or lock behind.' }

Test-BuildFails 'invalid Claude settings.json' {
    param($copy)
    Add-Content (Join-Path $copy 'adapters/claude/config/settings.json') '} this is not json {'
}

Test-BuildFails 'duplicate agent name' {
    param($copy)
    $architect = Join-Path $copy 'shared/agents/architect/agent.yml'
    (Get-Content $architect -Raw) -replace 'name:\s*\S+', 'name: implementer' | Set-Content $architect -NoNewline
}

Test-BuildFails 'unknown Claude tool name in capability manifest' {
    param($copy)
    $manifest = Join-Path $copy 'adapters/claude/capabilities.tsv'
    $lines = Get-Content $manifest | ForEach-Object { if ($_ -match '^architect\t') { "architect`tShell" } else { $_ } }
    Set-Content $manifest $lines
}

Test-BuildFails 'duplicate plugin name' {
    param($copy)
    $manifest = Join-Path $copy 'adapters/plugins.tsv'
    $lines = Get-Content $manifest
    Add-Content $manifest $lines[1]
}

Test-BuildFails 'leftover template placeholder' {
    param($copy)
    Add-Content (Join-Path $copy 'shared/global-instructions.md') "`n__NOT_A_REAL_PLACEHOLDER__"
}

Test-BuildFails 'unknown placeholder beside an allowed installer placeholder' {
    param($copy)
    $path = Join-Path $copy 'adapters/claude/config/settings.json'
    (Get-Content $path -Raw).Replace('__CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY__', '__CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY____UNKNOWN_PLACEHOLDER__') | Set-Content $path
}

Remove-Item $work -Recurse -Force -ErrorAction SilentlyContinue
if ($Summary) { Write-Output 'Tests: PASS | build validation' } else { Write-Output 'PASS build validation: invalid JSON, duplicate agent, unknown Claude tool name, duplicate plugin, and leftover placeholders are all rejected without leaving output; parallel builds swap generated/ safely' }
exit 0