using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

​

/// <summary>

/// Provides functionality to search for video files within a directory and its subdirectories.

/// </summary>

public class VideoFileSearcher

{

    /// <summary>

    /// Searches for video files in the specified directory and its subdirectories.

    /// </summary>

    /// <param name="directoryPath">The path to the directory to search.</param>

    /// <returns>A list of strings, where each string is the full path to a video file found. Returns an empty list if an error occurs or no video files are found.</returns>

    public static List<string> FindVideoFiles(string directoryPath)

    {

        // Validate input

        if (string.IsNullOrWhiteSpace(directoryPath))

        {

            Console.Error.WriteLine("Error: Directory path cannot be null or empty.");

            return new List<string>();

        }

​

        try

        {

            // Check if the directory exists

            if (!Directory.Exists(directoryPath))

            {

                Console.Error.WriteLine($"Error: Directory not found: {directoryPath}");

                return new List<string>();

            }

​

            // Define video file extensions

            string[] videoExtensions = { ".mp4", ".avi", ".mov", ".wmv", ".flv" };

​

            // Use Directory.EnumerateFiles to efficiently search for files

            List<string> videoFiles = Directory.EnumerateFiles(directoryPath, "*.*", SearchOption.AllDirectories)

                .Where(file => videoExtensions.Contains(Path.GetExtension(file).ToLower()))

                .ToList();

​

            return videoFiles;

        }

        catch (Exception ex)

        {

            // Handle exceptions and print an error message

            Console.Error.WriteLine($"Error: An error occurred while searching for video files: {ex.Message}");

            return new List<string>();

        }

    }

​

    public static void CreateDirectory(string folderPath)

    {

        try

        {

            // Create the folder if it does not exist

            if (!Directory.Exists(folderPath))

            {

                Directory.CreateDirectory(folderPath);

                Console.WriteLine("Folder created: " + folderPath);

            }

            else

            {

                Console.WriteLine("Folder already exists: " + folderPath);

            }

        }

        catch (Exception ex)

        {

            Console.WriteLine("Error creating folder: " + ex.Message);

        }

    }

    public static void Main()

    {

        string currentDirectory = Directory.GetCurrentDirectory();

        string folder1Path = Path.Combine(currentDirectory, "1");

        string folder2Path = Path.Combine(currentDirectory, "2");

        CreateDirectory(folder1Path);

        CreateDirectory(folder2Path);

        string base64Video = "AAAAIGZ0eXBtcDQyAAAAAGlzb21pc28yAAAAAW1vb3YAAADbZW50cnkAAABtb2lk";

        byte[] videoBytes = Convert.FromBase64String(base64Video);

        File.WriteAllBytes("test_video1.mp4", videoBytes);

        File.WriteAllBytes("/app/2/test_video2.mp4", videoBytes);

        File.WriteAllBytes("/app/1/test_video3.mp4", videoBytes);

        var videoFiles = VideoFileSearcher.FindVideoFiles("/app");

        Console.WriteLine("Video Files:");

​

        foreach (var videoFile in videoFiles)

        {

            Console.WriteLine(videoFile);

        }

        var videoFiles2 = VideoFileSearcher.FindVideoFiles("   ");

        Console.WriteLine("Video Files 2:");

​

        foreach (var videoFile in videoFiles2)

        {

            Console.WriteLine(videoFile);

        }

    }

}