using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CPRNIMS.Domain.Services
{
    public static class ContentTypeHelper
    {
        public static string GetContentType(string fileName)
        {
            var extension = Path.GetExtension(fileName).ToLowerInvariant();
            return extension switch
            {
                ".pdf" => "application/pdf",
                ".doc" => "application/msword",
                ".docx" => "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
                ".pptx" => "application/vnd.openxmlformats-officedocument.presentationml.presentation",
                ".xls" => "application/vnd.ms-excel",
                ".xlsx" => "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
                ".png" => "image/png",
                ".jpg" or ".jpeg" => "image/jpeg",
                ".gif" => "image/gif",
                ".txt" => "text/plain",
                _ => "application/octet-stream"
            };
        }
        public static string ValidateFile(string filePath, string uploadsPath)
        {
            var message = "";
            // Security: Prevent directory traversal attacks
            var fullPath = Path.GetFullPath(filePath);

            if (!fullPath.StartsWith(Path.GetFullPath(uploadsPath)))
            {
                message = "Invalid file path";
            }

            if (!System.IO.File.Exists(filePath))
            {
                message = "File not found";
            }
            return message;
        }
    }
}