[CmdletBinding()]
param(
    [string]$UvPath,
    [string]$OllamaPath,
    [string]$OllamaModels,
    [string]$DataDir,
    [string]$UvCacheDir,
    [string]$PythonInstallDir
)

$ErrorActionPreference = 'Stop'

function Get-ConfiguredPath {
    param(
        [string]$ParameterValue,
        [string]$EnvironmentName,
        [string]$DefaultValue
    )

    if (-not [string]::IsNullOrWhiteSpace($ParameterValue)) {
        return [System.IO.Path]::GetFullPath($ParameterValue)
    }
    $environmentValue = [System.Environment]::GetEnvironmentVariable($EnvironmentName)
    if (-not [string]::IsNullOrWhiteSpace($environmentValue)) {
        return [System.IO.Path]::GetFullPath($environmentValue)
    }
    return [System.IO.Path]::GetFullPath($DefaultValue)
}

function Test-OllamaReady {
    try {
        $null = Invoke-RestMethod `
            -Uri 'http://127.0.0.1:11434/api/version' `
            -Method Get `
            -TimeoutSec 2
        return $true
    }
    catch {
        return $false
    }
}

$repositoryRoot = [System.IO.Path]::GetFullPath((Join-Path $PSScriptRoot '..'))
if (-not (Test-Path -LiteralPath (Join-Path $repositoryRoot 'pyproject.toml') -PathType Leaf)) {
    throw "Das Repository konnte relativ zum Startskript nicht verifiziert werden."
}

$driveRoot = [System.IO.Path]::GetPathRoot($repositoryRoot)
$resolvedUv = Get-ConfiguredPath `
    -ParameterValue $UvPath `
    -EnvironmentName 'JAVIS_UV_PATH' `
    -DefaultValue (Join-Path $driveRoot 'Javis-Tools\uv\uv.exe')
$resolvedOllama = Get-ConfiguredPath `
    -ParameterValue $OllamaPath `
    -EnvironmentName 'JAVIS_OLLAMA_PATH' `
    -DefaultValue (Join-Path $driveRoot 'Javis-Tools\ollama\ollama.exe')
$resolvedModels = Get-ConfiguredPath `
    -ParameterValue $OllamaModels `
    -EnvironmentName 'JAVIS_OLLAMA_MODELS' `
    -DefaultValue (Join-Path $driveRoot 'Javis-Data\ollama-models')
$resolvedData = Get-ConfiguredPath `
    -ParameterValue $DataDir `
    -EnvironmentName 'JAVIS_DATA_DIR' `
    -DefaultValue (Join-Path $driveRoot 'Javis-Data\runtime')
$resolvedCache = Get-ConfiguredPath `
    -ParameterValue $UvCacheDir `
    -EnvironmentName 'JAVIS_UV_CACHE_DIR' `
    -DefaultValue (Join-Path $driveRoot 'Javis-Tools\uv-cache')
$resolvedPython = Get-ConfiguredPath `
    -ParameterValue $PythonInstallDir `
    -EnvironmentName 'JAVIS_PYTHON_INSTALL_DIR' `
    -DefaultValue (Join-Path $driveRoot 'Javis-Tools\python')

if (-not (Test-Path -LiteralPath $resolvedUv -PathType Leaf)) {
    throw "uv.exe wurde nicht gefunden: $resolvedUv"
}
if (-not (Test-Path -LiteralPath $resolvedModels -PathType Container)) {
    throw "Der externe Ollama-Modellpfad wurde nicht gefunden: $resolvedModels"
}

$env:JAVIS_DATA_DIR = $resolvedData
$env:OLLAMA_MODELS = $resolvedModels
$env:OLLAMA_HOST = '127.0.0.1:11434'
$env:UV_CACHE_DIR = $resolvedCache
$env:UV_PYTHON_INSTALL_DIR = $resolvedPython

if (-not (Test-OllamaReady)) {
    if (-not (Test-Path -LiteralPath $resolvedOllama -PathType Leaf)) {
        throw "Ollama ist nicht erreichbar und ollama.exe wurde nicht gefunden: $resolvedOllama"
    }
    Write-Host "Ollama wird lokal auf 127.0.0.1:11434 gestartet ..."
    $ollamaProcess = Start-Process `
        -FilePath $resolvedOllama `
        -ArgumentList 'serve' `
        -WindowStyle Hidden `
        -PassThru

    $ready = $false
    for ($attempt = 1; $attempt -le 30; $attempt++) {
        if ($ollamaProcess.HasExited) {
            throw "Ollama wurde beendet, bevor die lokale API bereit war."
        }
        Start-Sleep -Milliseconds 500
        if (Test-OllamaReady) {
            $ready = $true
            break
        }
    }
    if (-not $ready) {
        throw "Ollama war nach 15 Sekunden nicht unter 127.0.0.1:11434 erreichbar."
    }
}

Push-Location $repositoryRoot
try {
    & $resolvedUv run javis chat
    exit $LASTEXITCODE
}
finally {
    Pop-Location
}