using System.IO;
using System.Threading.Tasks;

namespace MarkdownEditor.Services;

/// <summary>
/// Default implementation of <see cref="IFileService"/> using System.IO.
/// Provides file system operations for reading and writing markdown files.
/// </summary>
public class FileService : IFileService
{
    /// <inheritdoc/>
    public async Task<string> ReadFileAsync(string path)
    {
        if (string.IsNullOrWhiteSpace(path))
        {
            throw new System.ArgumentException("File path cannot be null or empty.", nameof(path));
        }

        return await File.ReadAllTextAsync(path);
    }

    /// <inheritdoc/>
    public async Task WriteFileAsync(string path, string content)
    {
        if (string.IsNullOrWhiteSpace(path))
        {
            throw new System.ArgumentException("File path cannot be null or empty.", nameof(path));
        }

        await File.WriteAllTextAsync(path, content ?? string.Empty);
    }

    /// <inheritdoc/>
    public bool FileExists(string path)
    {
        return !string.IsNullOrWhiteSpace(path) && File.Exists(path);
    }

    /// <inheritdoc/>
    public string GetFileName(string path)
    {
        if (string.IsNullOrWhiteSpace(path))
        {
            return string.Empty;
        }

        return Path.GetFileName(path);
    }
}