using System.Diagnostics;
using System.IO;
using ClaudeDo.Installer.Core;

namespace ClaudeDo.Installer.Steps;

public sealed class StopWorkerStep : IInstallStep
{
    public const string LegacyTaskName = "ClaudeDoWorker";

    // Both must be stopped before the install dir is touched: a running app/worker
    // exe locks its directory, so Directory.Move during extraction would otherwise
    // fail with "Access to the path '...\app' is denied".
    private static readonly string[] ProcessNames = { "ClaudeDo.Worker", "ClaudeDo.App" };

    public string Name => "Stop Worker";

    public async Task<StepResult> ExecuteAsync(InstallContext ctx, IProgress<string> progress, CancellationToken ct)
    {
        progress.Report("Stopping ClaudeDo processes (if running)...");
        var installDir = ctx.InstallDirectory;
        foreach (var name in ProcessNames)
        {
            foreach (var p in Process.GetProcessesByName(name))
            {
                try
                {
                    var path = p.MainModule?.FileName;
                    if (path is not null && !IsUnder(path, installDir)) continue;
                    p.Kill(entireProcessTree: true);
                    p.WaitForExit(10000);
                }
                catch { /* process may have exited or be inaccessible */ }
                finally { p.Dispose(); }
            }
        }
        await Task.CompletedTask;
        return StepResult.Ok();
    }

    private static bool IsUnder(string filePath, string dir)
    {
        try
        {
            if (string.IsNullOrWhiteSpace(dir)) return true; // can't scope — be permissive
            var full = Path.GetFullPath(filePath);
            var root = Path.GetFullPath(dir).TrimEnd(Path.DirectorySeparatorChar) + Path.DirectorySeparatorChar;
            return full.StartsWith(root, StringComparison.OrdinalIgnoreCase);
        }
        catch { return false; }
    }
}