# Test fingerprint computation matches Python backend
# Expected: SHA256("Google Chrome|117.0.5938.132|Google LLC")

$code = @"
using System;
using System.Security.Cryptography;
using System.Text;

public class FingerprintTester
{
    public static string ComputeFingerprint(string displayName, string displayVersion, string publisher)
    {
        var normalized = $"{displayName}|{displayVersion}|{publisher}";
        var bytes = Encoding.UTF8.GetBytes(normalized);
        var hash = SHA256.HashData(bytes);
        return Convert.ToHexString(hash).ToLowerInvariant();
    }
}
"@

Add-Type -TypeDefinition $code

# Test vectors from backend
$tests = @(
    @{
        Name = "Google Chrome"
        Version = "117.0.5938.132"
        Publisher = "Google LLC"
        Description = "Standard application"
    },
    @{
        Name = "Microsoft Office"
        Version = "16.0.16827.20166"
        Publisher = "Microsoft Corporation"
        Description = "Office suite"
    },
    @{
        Name = "Test App No Version"
        Version = ""
        Publisher = "Test Publisher"
        Description = "Empty version string"
    },
    @{
        Name = "Test App Empty"
        Version = ""
        Publisher = ""
        Description = "Empty strings"
    }
)

Write-Host "C# Fingerprint Algorithm Test" -ForegroundColor Cyan
Write-Host "==============================" -ForegroundColor Cyan
Write-Host ""

foreach ($test in $tests) {
    $fp = [FingerprintTester]::ComputeFingerprint($test.Name, $test.Version, $test.Publisher)
    Write-Host "Test: $($test.Description)" -ForegroundColor Yellow
    Write-Host "  Input: '$($test.Name)|$($test.Version)|$($test.Publisher)'"
    Write-Host "  Fingerprint: $fp" -ForegroundColor Green
    Write-Host "  Length: $($fp.Length) chars" -ForegroundColor Gray
    Write-Host ""
}

# Verify format
$testFp = [FingerprintTester]::ComputeFingerprint("Test", "1.0", "Publisher")
if ($testFp.Length -eq 64) {
    Write-Host "Format check: PASS (64 characters)" -ForegroundColor Green
} else {
    Write-Host "Format check: FAIL (expected 64, got $($testFp.Length))" -ForegroundColor Red
}

if ($testFp -match '^[0-9a-f]{64}$') {
    Write-Host "Hex check: PASS (lowercase hexadecimal)" -ForegroundColor Green
} else {
    Write-Host "Hex check: FAIL (invalid characters)" -ForegroundColor Red
}