# Installs (or updates) Nibi for the current Windows user. No admin needed.
#
#   irm https://niranjand.in/nibi/install.ps1 | iex
#
# What it does: reads latest.json from the public releases repo
# (github.com/Niranjan266/nibi-releases), downloads that version's installer to
# %TEMP%, checks it, runs it silently for you only, and starts Nibi.
# Nothing else is downloaded and nothing is sent anywhere.

& {
    $ErrorActionPreference = 'Stop'
    $repo = 'https://github.com/Niranjan266/nibi-releases'
    $latestUrl = "$repo/releases/latest/download/latest.json"

    function Say([string]$text, [string]$color = 'Gray') { Write-Host "  $text" -ForegroundColor $color }
    function Fail([string]$text) {
        Write-Host ''
        Write-Host "  Nibi was not installed: $text" -ForegroundColor Red
        Write-Host "  You can always download the installer from $repo/releases/latest" -ForegroundColor Gray
        Write-Host ''
    }

    Write-Host ''
    Write-Host '  Nibi installer' -ForegroundColor Magenta
    Write-Host '  A small friend on your desktop that watches your AI agents.' -ForegroundColor Gray
    Write-Host ''

    if ($env:OS -ne 'Windows_NT' -or -not [Environment]::Is64BitOperatingSystem) {
        Fail 'Nibi needs 64-bit Windows 10 or 11.'
        return
    }

    # Windows PowerShell 5.1 may default to old TLS versions; GitHub needs TLS 1.2.
    try { [Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12 } catch { }
    $oldProgress = $ProgressPreference
    $ProgressPreference = 'SilentlyContinue' # the progress bar makes downloads much slower in 5.1

    try {
        Say 'Looking for the latest version...'
        try {
            $latest = Invoke-RestMethod -Uri $latestUrl -UseBasicParsing -TimeoutSec 30
        } catch {
            Fail "could not read $latestUrl ($($_.Exception.Message))."
            return
        }
        $version = [string]$latest.version
        $url = [string]$latest.platforms.'windows-x86_64'.url
        if ($version -notmatch '^\d+\.\d+\.\d+$' -or -not $url) {
            Fail 'latest.json did not look right.'
            return
        }
        $expected = "Nibi_${version}_x64-setup.exe"
        $prefix = "$repo/releases/download/"
        if (-not $url.StartsWith($prefix, [StringComparison]::OrdinalIgnoreCase) -or [IO.Path]::GetFileName(([Uri]$url).AbsolutePath) -ne $expected) {
            Fail "the download link was not the expected $expected from $repo."
            return
        }
        Say "Latest version: $version" 'Green'

        $installed = Get-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\Nibi' -ErrorAction SilentlyContinue
        if ($installed -and $installed.DisplayVersion) {
            if ($installed.DisplayVersion -eq $version) { Say "Nibi $version is already installed; installing it again." }
            else { Say "Updating Nibi $($installed.DisplayVersion) to $version. Your rules, history and hooks are kept." }
        }

        $file = Join-Path ([IO.Path]::GetTempPath()) $expected
        Say "Downloading $expected..."
        try {
            Invoke-WebRequest -Uri $url -OutFile $file -UseBasicParsing -TimeoutSec 600
        } catch {
            Fail "the download failed ($($_.Exception.Message))."
            return
        }

        $info = Get-Item -LiteralPath $file -ErrorAction SilentlyContinue
        if (-not $info -or $info.Name -ne $expected -or $info.Length -lt 1MB) {
            Fail 'the downloaded file was missing or too small.'
            Remove-Item -LiteralPath $file -ErrorAction SilentlyContinue
            return
        }
        Say ('Downloaded {0:N1} MB.' -f ($info.Length / 1MB)) 'Green'

        Say 'Installing for you only (no admin prompt)...'
        $p = Start-Process -FilePath $file -ArgumentList '/S' -Wait -PassThru
        Remove-Item -LiteralPath $file -ErrorAction SilentlyContinue
        if ($p.ExitCode -ne 0) {
            Fail "the installer stopped with code $($p.ExitCode)."
            return
        }

        $exe = Join-Path $env:LOCALAPPDATA 'Nibi\nibi.exe'
        if (Test-Path -LiteralPath $exe) {
            Say "Nibi $version is installed." 'Green'
            Say 'Starting Nibi. Look for it on your taskbar.'
            Start-Process -FilePath $exe
        } else {
            Say "Nibi $version is installed. Start it from the Start menu." 'Green'
        }
        Write-Host ''
        Say 'To remove it later: Settings > Apps > Nibi, or'
        Say 'irm https://niranjand.in/nibi/uninstall.ps1 | iex'
        Write-Host ''
    } finally {
        $ProgressPreference = $oldProgress
    }
}