// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Diagnostics;
using System.IO;

namespace Microsoft.DotNet.MacOsPkg.Core;

internal static class AppBundle
{
    /// <summary>
    /// Determine whether a path is an app bundle.
    /// 
    /// A path an app bundle if:
    /// - It's a directory and ends in .app and contains a Contents directory and that contains an Info.plist file.
    /// - It's a file and ends in .app.
    /// </summary>
    /// <param name="path">Path to check</param>
    /// <returns>True if this is an app bundle, false otherwise</returns>
    internal static bool IsBundle(string path)
    {
        if (Directory.Exists(path))
        {
            // Case sensitive check for .app extension is intentional.
            if (Path.GetExtension(path) == ".app")
            {
                bool containsAppBundleContents = Directory.Exists(Path.Combine(path, "Contents")) &&
                    File.Exists(Path.Combine(path, "Contents", "Info.plist"));
                if (!containsAppBundleContents)
                {
                    // If we hit this, and it is a valid app bundle, then we should adjust the logic above.
                    // If we never hit this (likely), then remove.
                    throw new Exception("Unexpected .app directory structure. Please contact dnceng.");
                }
                return containsAppBundleContents;
            }
        }
        else
        {
            return Path.GetExtension(path) == ".app";
        }

        return false;
    }

    internal static void Unpack(string inputPath, string outputPath)
    {
        string args = $"-V -xk {inputPath} {outputPath}";
        ExecuteHelper.Run("ditto", args);
    }

    internal static void Pack(string inputPath, string outputPath)
    {
        string args = $"-c -k --sequesterRsrc {inputPath} {outputPath}";
        ExecuteHelper.Run("ditto", args);
    }

    internal static void VerifySignature(string inputPath)
    {
        string output = ExecuteHelper.Run("codesign", $"--verify --verbose {inputPath}");
        if (output.Contains("is not signed at all"))
        {
            throw new Exception("No signature found in app bundle");
        }
    }
}