// -----------------------------------------------------------------------------
// Program.cs
// Sprint: SPRINT_20260121_036_BinaryIndex_golden_corpus_bundle_verification
// Task: GCB-003 - Implement standalone offline verifier
// Description: Entry point for standalone bundle verifier CLI
// -----------------------------------------------------------------------------


// Exit codes:
// 0: All verifications passed
// 1: One or more verifications failed
// 2: Invalid input or configuration error

using StellaOps.Verifier;
using System.CommandLine;
using System.CommandLine.Builder;
using System.CommandLine.Parsing;

var bundleOption = new Option<FileInfo>("--bundle", ["-b"])
{
    Description = "Path to the evidence bundle to verify",
    IsRequired = true
};

var trustedKeysOption = new Option<FileInfo?>("--trusted-keys", ["-k"])
{
    Description = "Path to trusted public keys file"
};

var trustProfileOption = new Option<FileInfo?>("--trust-profile", ["-p"])
{
    Description = "Path to trust profile JSON file"
};

var outputOption = new Option<FileInfo?>("--output", ["-o"])
{
    Description = "Path to write verification report"
};

var formatOption = new Option<ReportFormat>("--format", ["-f"])
{
    Description = "Report output format"
};
formatOption.SetDefaultValue(ReportFormat.Markdown);

var verifySignaturesOption = new Option<bool>("--verify-signatures")
{
    Description = "Verify bundle manifest signatures"
};
verifySignaturesOption.SetDefaultValue(true);

var verifyTimestampsOption = new Option<bool>("--verify-timestamps")
{
    Description = "Verify RFC 3161 timestamps"
};
verifyTimestampsOption.SetDefaultValue(true);

var verifyDigestsOption = new Option<bool>("--verify-digests")
{
    Description = "Verify blob digests"
};
verifyDigestsOption.SetDefaultValue(true);

var verifyPairsOption = new Option<bool>("--verify-pairs")
{
    Description = "Verify pair artifacts (SBOM, delta-sig)"
};
verifyPairsOption.SetDefaultValue(true);

var quietOption = new Option<bool>("--quiet", ["-q"])
{
    Description = "Suppress output except for errors"
};

var verboseOption = new Option<bool>("--verbose", ["-v"])
{
    Description = "Show detailed verification output"
};

var verifyCommand = new Command("verify", "Verify an evidence bundle")
{
    bundleOption,
    trustedKeysOption,
    trustProfileOption,
    outputOption,
    formatOption,
    verifySignaturesOption,
    verifyTimestampsOption,
    verifyDigestsOption,
    verifyPairsOption,
    quietOption,
    verboseOption
};

verifyCommand.SetHandler(async (context) =>
{
    var bundle = context.ParseResult.GetValueForOption(bundleOption)!;
    var trustedKeys = context.ParseResult.GetValueForOption(trustedKeysOption);
    var trustProfile = context.ParseResult.GetValueForOption(trustProfileOption);
    var output = context.ParseResult.GetValueForOption(outputOption);
    var format = context.ParseResult.GetValueForOption(formatOption);
    var verifySignatures = context.ParseResult.GetValueForOption(verifySignaturesOption);
    var verifyTimestamps = context.ParseResult.GetValueForOption(verifyTimestampsOption);
    var verifyDigests = context.ParseResult.GetValueForOption(verifyDigestsOption);
    var verifyPairs = context.ParseResult.GetValueForOption(verifyPairsOption);
    var quiet = context.ParseResult.GetValueForOption(quietOption);
    var verbose = context.ParseResult.GetValueForOption(verboseOption);

    var options = new VerifierOptions
    {
        BundlePath = bundle.FullName,
        TrustedKeysPath = trustedKeys?.FullName,
        TrustProfilePath = trustProfile?.FullName,
        OutputPath = output?.FullName,
        OutputFormat = format,
        VerifySignatures = verifySignatures,
        VerifyTimestamps = verifyTimestamps,
        VerifyDigests = verifyDigests,
        VerifyPairs = verifyPairs,
        Quiet = quiet,
        Verbose = verbose
    };

    var verifier = new BundleVerifier();
    var exitCode = await verifier.VerifyAsync(options, context.GetCancellationToken());
    context.ExitCode = exitCode;
});

var infoCommand = new Command("info", "Display bundle information without verification")
{
    bundleOption,
    formatOption,
    quietOption
};

infoCommand.SetHandler(async (context) =>
{
    var bundle = context.ParseResult.GetValueForOption(bundleOption)!;
    var format = context.ParseResult.GetValueForOption(formatOption);
    var quiet = context.ParseResult.GetValueForOption(quietOption);

    var verifier = new BundleVerifier();
    var exitCode = await verifier.ShowInfoAsync(
        bundle.FullName,
        format,
        quiet,
        context.GetCancellationToken());
    context.ExitCode = exitCode;
});

var rootCommand = new RootCommand("Stella Ops Bundle Verifier - Offline evidence bundle verification")
{
    verifyCommand,
    infoCommand
};

// Add version option
rootCommand.AddOption(new Option<bool>("--version", "Show version information"));

var parser = new CommandLineBuilder(rootCommand)
    .UseDefaults()
    .UseExceptionHandler((ex, context) =>
    {
        Console.Error.WriteLine($"Error: {ex.Message}");
        context.ExitCode = 2;
    })
    .Build();

return await parser.InvokeAsync(args);