using System.Text;

namespace Core.Helpers;

/// <summary>
/// Provides some path-related actions
/// </summary>
public static class PathHelper
{
    /// <summary>
    /// Verifies the existence of a path
    /// </summary>
    /// <param name="path">Path to check</param>
    /// <exception cref="FileNotFoundException">If the given path does not exist</exception>
    public static void CheckPathValidity(string path)
    {
        if (!File.Exists(path)) throw new FileNotFoundException($"Could not found file at {path}");
    }

    /// <summary>
    /// Create a file and all its parents directories if the file does not exists
    /// </summary>
    /// <param name="path"></param>
    public static void CreateFileIfNotExists(string path)
    {
        if (!File.Exists(path)) Directory.CreateDirectory(Path.GetDirectoryName(path)!);
    }
    
    /// <summary>
    /// Extracts raw text from a file references by given path  
    /// </summary>
    /// <param name="path">Location of file</param>
    /// <returns>Raw text</returns>
    /// <exception cref="FileNotFoundException">If the given path does not exist</exception>
    public static string TextFrom(string path)
    {
        CheckPathValidity(path);
        return File.ReadAllText(path);
    }

    /// <summary>
    /// Get the folder containing the last item of a given path
    /// 
    /// </summary>
    /// <param name="path">The given path</param>
    /// <returns>The folder containing the last element of the given path</returns>
    public static string GetFolder(string path)
    {
        path = path.Replace("\\", "/");
        var s = path.Split("/").ToList();
        s.RemoveAt(s.Count-1);
        var r = string.Join("/", s) + "/";
        return r;
    }

    public static string GetName(string path)
    {
        return path.Split("/")[0];
    }
    
    /// <summary>
    /// Concatenates a string representing the path of a folder and a string representing a file name
    /// The strings come from default arguments. 
    /// </summary>
    /// <returns>Concatenated path</returns>
    public static string FullPath(params string[] pathItems)
    {
        StringBuilder builder = new StringBuilder();
        foreach (var pi in pathItems)
        {
            builder.Append(pi);
        }
        return AbsolutePath(builder.ToString());
    }
    
    /// <summary>
    /// Returns the absolute path based on a relative path
    /// </summary>
    /// <param name="relative">relative path</param>
    /// <returns>Absolute path as string</returns>
    public static string AbsolutePath(string relative)
    {
        return Path.GetFullPath(relative);
    }
}