using System;
using System.IO;

namespace ytLive.Services;

/// <summary>
/// TASK 55·2: the default alert clip is materialised into <c>%TEMP%</c> so ffmpeg can read it as a file.
/// Nothing used to delete it, so every profile that ever played an alert left an orphan behind.
///
/// <para>Two touches, deliberately simple: delete this session's file on close, and sweep anything the
/// prefix matches at startup (a crash leaves the same debris a clean exit does not). Only files this app
/// created are touched — the prefix is the contract, and the sweep never deletes a directory.</para>
/// </summary>
public static class AlertClipCleanup
{
    public const string Prefix = "ytLive-alert-";

    /// <summary>Deletes stale alert clips left in <paramref name="directory"/>. Returns how many went.
    /// Missing directory is not an error.</summary>
    public static int Sweep(string directory)
    {
        try
        {
            if (!Directory.Exists(directory)) return 0;
            var removed = 0;
            foreach (var path in Directory.EnumerateFiles(directory, Prefix + "*.mp4"))
            {
                if (TryDelete(path)) removed++;
            }
            return removed;
        }
        catch (Exception ex)
        {
            Helpers.AppLog.Write(ex, "Alert clip sweep failed");
            return 0;
        }
    }

    /// <summary>Deletes one clip if it exists. Safe on null/blank and on a locked file.</summary>
    public static bool Delete(string? path)
    {
        if (string.IsNullOrWhiteSpace(path)) return false;
        return TryDelete(path);
    }

    private static bool TryDelete(string path)
    {
        try
        {
            if (!File.Exists(path)) return false;
            File.Delete(path);
            return true;
        }
        catch (Exception ex)
        {
            Helpers.AppLog.Write(ex, $"Alert clip delete failed: {path}");
            return false;
        }
    }
}