param([switch]$DownloadModel, [string]$Cmake = '')
$ErrorActionPreference = 'Stop'
$root = (Resolve-Path (Join-Path $PSScriptRoot '../..')).Path
Push-Location $root
try {
    $manifest = Get-Content ai/model.json -Raw | ConvertFrom-Json
    $vendor = Join-Path $root 'tools/vendor/llama.cpp'
    if (!(Test-Path -LiteralPath (Join-Path $vendor '.git'))) {
        & git clone --depth 1 https://github.com/ggml-org/llama.cpp.git $vendor
        if ($LASTEXITCODE -ne 0) { throw 'Cannot obtain the inference source' }
    }
    $revision = & git -C $vendor rev-parse HEAD
    if ($revision -ne $manifest.llama_commit) {
        & git -C $vendor fetch --depth 1 origin $manifest.llama_commit
        if ($LASTEXITCODE -ne 0) { throw 'Cannot obtain pinned inference source' }
        & git -C $vendor checkout --detach $manifest.llama_commit
        if ($LASTEXITCODE -ne 0) { throw 'Cannot select pinned inference source' }
    }
    if (!$Cmake) {
        $local = Join-Path $root 'tools/vendor/python/cmake/data/bin/cmake.exe'
        if (Test-Path -LiteralPath $local) { $Cmake = $local }
        else { $Cmake = (Get-Command cmake -ErrorAction Stop).Source }
    }
    $env:VSLANG = '1033'
    & $Cmake -S tools/fortune_ai -B build/fortune-ai -G 'Visual Studio 18 2026' -A x64
    if ($LASTEXITCODE -ne 0) { throw 'Inference configuration failed' }
    & $Cmake --build build/fortune-ai --config Release --target fortune-engine --parallel 8 -- /p:UseStructuredOutput=false
    if ($LASTEXITCODE -ne 0) { throw 'Inference compilation failed' }
    Copy-Item -LiteralPath build/fortune-ai/Release/fortune-engine.exe -Destination ai/fortune-engine.exe
    New-Item -ItemType Directory -Force -Path ai/licenses,ai/models | Out-Null
    Copy-Item -LiteralPath tools/vendor/llama.cpp/LICENSE -Destination ai/licenses/llama.cpp.txt
    $model = Join-Path (Join-Path $root 'ai') $manifest.file
    if ($DownloadModel -and !(Test-Path -LiteralPath $model)) {
        $url = "https://huggingface.co/$($manifest.source)/resolve/$($manifest.revision)/$($manifest.source_file)?download=true"
        & curl.exe --fail --location --retry 2 --output "$model.part" $url
        if ($LASTEXITCODE -ne 0) { throw 'Model download failed' }
        if ((Get-FileHash -LiteralPath "$model.part" -Algorithm SHA256).Hash -ne $manifest.sha256) {
            throw 'Model checksum mismatch; not publishing'
        }
        Move-Item -LiteralPath "$model.part" -Destination $model
    }
    if (!(Test-Path -LiteralPath $model)) { throw 'Distribution is incomplete: missing bundled model' }
    if ((Get-Item -LiteralPath $model).Length -ne $manifest.bytes -or
        (Get-FileHash -LiteralPath $model -Algorithm SHA256).Hash -ne $manifest.sha256) {
        throw 'Bundled model integrity check failed'
    }
    Write-Output 'Built the offline x64 worker and verified the bundled model.'
} finally { Pop-Location }