param([string]$BaseUrl = 'https://rootexai.com', [switch]$Offline)
$ErrorActionPreference = 'Stop'
if (-not [Uri]::IsWellFormedUriString($BaseUrl,[UriKind]::Absolute) -or ([Uri]$BaseUrl).Scheme -notin @('http','https')) { throw 'Use your rootexai HTTP(S) website URL.' }
$npmCommand = Get-Command npm.cmd -ErrorAction Stop
$nodeCommand = Get-Command node.exe -ErrorAction Stop
& $nodeCommand.Source -e 'if (Number(process.versions.node.split(/[.]/)[0]) < 20) process.exit(1)'
if ($LASTEXITCODE -ne 0) { throw 'Install Node.js 20 or newer first.' }
$rootexOrigin = $BaseUrl.TrimEnd('/')
$rootexManifest = Invoke-RestMethod -Uri ($rootexOrigin + '/downloads/latest.json?build=' + [DateTimeOffset]::UtcNow.ToUnixTimeSeconds())
if ($rootexManifest.package -notmatch '^rootex-cli-\d+\.\d+\.\d+\.tgz$' -or $rootexManifest.sha256 -notmatch '^[a-fA-F0-9]{64}$') { throw 'Invalid release manifest.' }
$rootexTempDir = Join-Path ([IO.Path]::GetTempPath()) ('rootex-install-' + [guid]::NewGuid().ToString())
New-Item -ItemType Directory -Path $rootexTempDir | Out-Null
$rootexPackagePath = Join-Path $rootexTempDir $rootexManifest.package
try {
    Invoke-WebRequest -UseBasicParsing -Uri ($rootexOrigin + '/downloads/' + $rootexManifest.package) -OutFile $rootexPackagePath
    if ((Get-FileHash -LiteralPath $rootexPackagePath -Algorithm SHA256).Hash -ne $rootexManifest.sha256) { throw 'Package checksum mismatch. Installation stopped.' }
    if ($Offline) { & $npmCommand.Source install --global --offline --ignore-scripts --no-audit --no-fund $rootexPackagePath }
    else { & $npmCommand.Source install --global $rootexPackagePath }
    if ($LASTEXITCODE -ne 0) { throw 'npm installation failed.' }
} finally {
    if (Test-Path -LiteralPath $rootexPackagePath -PathType Leaf) { Remove-Item -LiteralPath $rootexPackagePath }
    if (Test-Path -LiteralPath $rootexTempDir -PathType Container) { Remove-Item -LiteralPath $rootexTempDir }
}
# npm's PowerShell shims conflict with Restricted execution policy. Keep the
# generated .cmd shims so plain rootex also works without changing user policy.
$rootexPrefix = (& $npmCommand.Source prefix --global).Trim()
foreach ($rootexAlias in @('rootex','rootexai')) {
    $rootexShim = Join-Path $rootexPrefix ($rootexAlias + '.ps1')
    if (Test-Path -LiteralPath $rootexShim) {
        $rootexContent = Get-Content -LiteralPath $rootexShim -Raw
        if ($rootexContent -match 'rootex-cli' -and $rootexContent -match 'rootex.mjs') { Remove-Item -LiteralPath $rootexShim }
    }
}
# Remove only launchers positively identified as belonging to older Rootex releases.
foreach ($rootexLegacy in @('rotex-cli','rootex-cli')) {
    foreach ($rootexSuffix in @('', '.cmd', '.ps1')) {
        $rootexLegacyFile = Join-Path $rootexPrefix ($rootexLegacy + $rootexSuffix)
        if (Test-Path -LiteralPath $rootexLegacyFile -PathType Leaf) {
            $rootexLegacyContent = Get-Content -LiteralPath $rootexLegacyFile -Raw
            if ($rootexLegacyContent -match 'rootex-cli' -and $rootexLegacyContent -match 'rootex.mjs') { Remove-Item -LiteralPath $rootexLegacyFile -Force }
        }
    }
}
Write-Host 'Installed. Open a project folder and run rootex or rootexai. Node.js 20+ is required.'