# Installs StudyLock 1.2 from https://apps.abrarzahin.com/ on Windows 10 or 11.
#
#   irm https://apps.abrarzahin.com/studylock.ps1 | iex
#
# What it does, in order:
#   1. downloads the same installer the download page offers (StudyLock-Setup.exe)
#   2. checks its SHA-256 against the one below, and stops if it differs
#   3. runs it silently for your account only (no admin password), which opens StudyLock when done
# A file downloaded by a browser gets a "downloaded from the internet" mark, which is what makes
# SmartScreen warn about an installer that isn't signed with a paid certificate. PowerShell doesn't
# add that mark. Nothing else on your PC is changed.
& {
    $ErrorActionPreference = 'Stop'
    $ProgressPreference = 'SilentlyContinue'
    [Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12

    $App = 'StudyLock'
    $Sha = '9be64bfe0d0eb8f5c386527c0dcba553b0339ca4a9533436eb814bf0296ac17f'
    $Url = "https://apps.abrarzahin.com/$App-Setup.exe"
    $File = Join-Path $env:TEMP "$App-Setup.exe"

    Write-Host "Downloading $App-Setup.exe..."
    Invoke-WebRequest -Uri $Url -OutFile $File -UseBasicParsing
    if ((Get-FileHash -Path $File -Algorithm SHA256).Hash -ne $Sha.ToUpperInvariant()) {
        Remove-Item $File -ErrorAction SilentlyContinue
        throw "The download doesn't match the file published on abrarzahin.com, so nothing was installed. Try again in a few minutes."
    }

    Write-Host "Installing $App for your account..."
    # wait for the installer only: Start-Process -Wait would also wait for the app it opens, which keeps running
    $setup = Start-Process -FilePath $File -ArgumentList '/VERYSILENT', '/SUPPRESSMSGBOXES', '/NORESTART', '/SP-' -PassThru
    $null = $setup.Handle   # keeps ExitCode readable on Windows PowerShell 5.1
    $setup.WaitForExit()
    Remove-Item $File -ErrorAction SilentlyContinue
    if ($setup.ExitCode -ne 0) { throw "The installer stopped with code $($setup.ExitCode)." }

    $Exe = Join-Path $env:LOCALAPPDATA "Programs\$App\$App.exe"
    if (-not (Test-Path $Exe)) { throw "The installer finished but $Exe isn't there." }
    Write-Host "Done. $App is installed and starts when you sign in." -ForegroundColor Green
}