param(
    [Parameter(Mandatory=$true)][string]$ZipPath,
    [Parameter(Mandatory=$true)][string]$BinDir
)

$ErrorActionPreference = 'Stop'

if (-not (Test-Path -LiteralPath $ZipPath)) {
    throw "ZIP not found: $ZipPath"
}

if (-not (Test-Path -LiteralPath $BinDir)) {
    throw "BinDir not found: $BinDir"
}

function Write-ChecksumFile {
    param(
        [Parameter(Mandatory=$true)][string]$Path
    )
    $hash = (Get-FileHash -Algorithm SHA256 -LiteralPath $Path).Hash.ToLower()
    $outfile = "$Path.sha256"
    $line = "$hash  $([System.IO.Path]::GetFileName($Path))"
    Set-Content -Path $outfile -NoNewline -Encoding ASCII -Value $line
    Write-Host "Wrote $outfile"
}

# ZIP checksum
Write-ChecksumFile -Path $ZipPath

# Binaries checksums
Get-ChildItem -LiteralPath $BinDir -File | ForEach-Object {
    Write-ChecksumFile -Path $_.FullName
}