using Microsoft.VisualBasic.FileIO;

namespace Password_Manager
{
    static class ConfigFileManager
    {
#region Config flags
		/*Configuration: (format: fieldname=value)

		  password_store_path: path to the folder which contains the .gpg files
		  recipient: whose public key to use for encryption when a new password is created
		*/
		private static string CONFIGPATH = SpecialDirectories.CurrentUserApplicationData + "\\config.cfg";
		private static char DELIMETER = '=';
		private static string RECIPIENT = "recipient";
		private static string PATH = "password_store_path";
#endregion

		private static Config Configuration;

		public static void Init()
		{
            bool success = false;

            while (!success)
            {
                if (File.Exists(CONFIGPATH))
                {
                    StreamReader sr = new StreamReader(CONFIGPATH);
                    string? path = null, recipient = null;
                    while (!sr.EndOfStream)
                    {
                        string[]? fields = sr.ReadLine().Split(DELIMETER);
                        if (fields != null)
                        {
                            if (fields[0] == PATH)
                            {
                                path = fields[1];
                            }
                            else if (fields[0] == RECIPIENT)
                            {
                                recipient = fields[1];
                            }
                        }
                        else //probably an empty line or something
                        {
                            continue;
                        }
                    }

                    if (path != null && recipient != null)
                    {
                        Configuration = new Config(path, recipient);
                        success = true;
                    }
                    else
                    {
                        throw new InvalidConfigurationException("One or more required fileds were missing from the configuration file.");
                    }
                }
                else
                {
                    CreateDefaultConfig();
                }
            }
		}

        public static string GetPath()
        {
			return Configuration.PasswordStorePath;
        }

		public static string GetRecipient()
		{
			return Configuration.Recipient;
		}

        private static void CreateDefaultConfig()
        {
            try
            {
                string user = System.Security.Principal.WindowsIdentity.GetCurrent().Name;
                StreamWriter sw = new StreamWriter(CONFIGPATH);
                sw.WriteLine(RECIPIENT + DELIMETER + user);
                sw.WriteLine(PATH + DELIMETER + SpecialDirectories.CurrentUserApplicationData);
                sw.Close();
            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }
}