using System;
using System.IO;
using ClaudeDo.Data;

namespace ClaudeDo.Ui.Services;

/// <summary>
/// Temp PNGs written for clipboard-image paste into the interactive terminal (see
/// <see cref="ClaudeDo.Ui.Views.InteractiveTerminalView"/>) — dropped into the composer as a path,
/// the same way a file drop is, then read by Claude like any other file.
/// </summary>
public static class ClipboardImageTempStore
{
    public static string Directory => Path.Combine(Paths.AppDataRoot(), "tmp");

    /// <summary>A fresh, collision-free path for one pasted image.</summary>
    public static string NewPngPath(DateTime utcNow) => NewPngPath(Directory, utcNow);

    /// <summary>Deletes files older than <paramref name="maxAge"/> under the tmp dir — called once at
    /// app startup, not a running cleanup service.</summary>
    public static void DeleteOlderThan(TimeSpan maxAge, DateTime utcNow) => DeleteOlderThan(Directory, maxAge, utcNow);

    /// <summary>Test seam for <see cref="NewPngPath(DateTime)"/> — takes the target dir explicitly
    /// instead of the real app data root.</summary>
    internal static string NewPngPath(string dir, DateTime utcNow) =>
        Path.Combine(dir, $"paste-{utcNow:yyyyMMdd-HHmmssfff}-{Guid.NewGuid():N}.png");

    /// <summary>Test seam for <see cref="DeleteOlderThan(TimeSpan,DateTime)"/> — takes the target dir
    /// explicitly instead of the real app data root.</summary>
    internal static void DeleteOlderThan(string dir, TimeSpan maxAge, DateTime utcNow)
    {
        if (!System.IO.Directory.Exists(dir)) return;

        foreach (var file in System.IO.Directory.EnumerateFiles(dir))
        {
            try
            {
                if (utcNow - File.GetLastWriteTimeUtc(file) > maxAge)
                    File.Delete(file);
            }
            catch (IOException) { /* best effort */ }
            catch (UnauthorizedAccessException) { /* best effort */ }
        }
    }
}