$ErrorActionPreference = "Stop"
$BaseUrl = "https://stoicsoft.net/phonerc/downloads"
$InstallDir = if ($env:PHONERC_COMPANION_HOME) { $env:PHONERC_COMPANION_HOME } else { Join-Path $env:LOCALAPPDATA "PhoneRC Companion" }

if (Get-Command py -ErrorAction SilentlyContinue) {
    $PythonExe = "py"; $PythonPrefix = @("-3")
} elseif (Get-Command python -ErrorAction SilentlyContinue) {
    $PythonExe = "python"; $PythonPrefix = @()
} else {
    throw "Python 3.8 or newer is required. Install Python, then try again."
}
& $PythonExe @PythonPrefix -c "import sys; raise SystemExit(sys.version_info < (3, 8))"
if ($LASTEXITCODE -ne 0) { throw "Python 3.8 or newer is required." }
if (-not (Get-Command git -ErrorAction SilentlyContinue)) {
    throw "Git is required to install the Windows Bluetooth dependency."
}

$TempDir = Join-Path ([IO.Path]::GetTempPath()) ("phonerc-" + [guid]::NewGuid())
New-Item -ItemType Directory -Path $TempDir | Out-Null
try {
    $OuterZip = Join-Path $TempDir "companion.zip"
    $OuterDir = Join-Path $TempDir "outer"
    Write-Host "Downloading PhoneRC Companion for Windows..."
    Invoke-WebRequest "$BaseUrl/phonerc-companion-windows.zip" -OutFile $OuterZip
    Expand-Archive $OuterZip -DestinationPath $OuterDir
    $InnerZip = Get-ChildItem $OuterDir -Filter *.zip -Recurse | Select-Object -First 1
    if ($InnerZip) {
        $PackageDir = Join-Path $TempDir "package"
        Expand-Archive $InnerZip.FullName -DestinationPath $PackageDir
        $SourceDir = Join-Path $PackageDir "shortcut-launcher"
    } else { $SourceDir = Join-Path $OuterDir "shortcut-launcher" }
    if (-not (Test-Path (Join-Path $SourceDir "shortcut_launcher.py"))) { throw "Invalid download." }

    New-Item -ItemType Directory -Force -Path $InstallDir | Out-Null
    $ExistingConfig = Join-Path $InstallDir "config.json"
    $SavedConfig = Join-Path $TempDir "config.json"
    if (Test-Path $ExistingConfig) { Copy-Item $ExistingConfig $SavedConfig }
    Copy-Item (Join-Path $SourceDir "*") $InstallDir -Recurse -Force
    if (Test-Path $SavedConfig) { Copy-Item $SavedConfig $ExistingConfig -Force }
    $VenvDir = Join-Path $InstallDir ".venv"
    & $PythonExe @PythonPrefix -m venv $VenvDir
    $VenvPython = Join-Path $VenvDir "Scripts\python.exe"
    & $VenvPython -m pip install --disable-pip-version-check -r (Join-Path $InstallDir "requirements.txt")
    $SelfTest = (& $VenvPython (Join-Path $InstallDir "shortcut_launcher.py") --self-test | Out-String)
    Write-Host $SelfTest
    if ($SelfTest -notmatch '(?m)^companion supported: yes\r?$') {
        throw "PhoneRC Companion prerequisites are incomplete; automatic startup was not configured."
    }

    $Pythonw = Join-Path $VenvDir "Scripts\pythonw.exe"
    $Launcher = Join-Path ([Environment]::GetFolderPath("Startup")) "PhoneRC Companion.cmd"
    Set-Content $Launcher "@start `"PhoneRC Companion`" /min `"$Pythonw`" `"$InstallDir\shortcut_launcher.py`" --both" -Encoding ASCII
    $LauncherScript = Join-Path $InstallDir "shortcut_launcher.py"
    Start-Process $Pythonw -ArgumentList @("`"$LauncherScript`"", "--both") -WorkingDirectory $InstallDir
    Write-Host "PhoneRC Companion is installed, running, and will start with Windows."
    Write-Host "Installed at: $InstallDir"
} finally {
    Remove-Item $TempDir -Recurse -Force -ErrorAction SilentlyContinue
}