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

namespace BeWo.ServerUtils.Core
{
	internal struct Module
	{
		public string Short { get; set; }
		public string Name { get; set; }

		public Module(string shortName, string name)
		{
			Short = shortName;
			Name = name;
		}
	};

	internal struct SmtpConnectionInfo
	{
		public string SmtpServer { get; set; }
		public bool Enabled { get; set; }
		public string SmtpUser { get; set; }
		public string SmtpPassword { get; set; }
		public string MailSender { get; set; }
		public string MailReceiver { get; set; }
	}

	public static class AppSettingReader
	{
		private static readonly string _AppSettingsSmtpServer			= "SendMailModuleSmtpServer";
		private static readonly string _AppSettingsEnabledFormat		= "SendMailModule{0}Enabled";
		private static readonly string _AppSettingsSmtpUserFormat		= "SendMailModule{0}SmtpUser";
		private static readonly string _AppSettingsSmtpPasswordFormat	= "SendMailModule{0}SmtpPassword";
		private static readonly string _AppSettingsSenderFormat			= "SendMailModule{0}Sender";
		private static readonly string _AppSettingsReceiverFormat		= "SendMailModule{0}Receiver";

		#region SmtpConnectionInfo
		internal static SmtpConnectionInfo GetSmtpConnectionInfo(Module module)
			=> GetSmtpConnectionInfo(module.Short);
		internal static SmtpConnectionInfo GetSmtpConnectionInfo(string key)
		{
			return new SmtpConnectionInfo()
			{
				SmtpServer = GetSmtpServer(),
				Enabled = GetSendMailModuleEnabled(key),
				SmtpUser = GetSendMailModuleUser(key),
				SmtpPassword = GetSendMailModulePassword(key),
				MailSender = GetSendMailModuleSender(key),
				MailReceiver = GetSendMailModuleReceiver(key)
			};
		}
		private static string GetSmtpServer()
		{
			var setting_path = _AppSettingsSmtpServer;
			var setting = ConfigurationManager.AppSettings.Get(setting_path);
			return setting;
		}
		private static bool GetSendMailModuleEnabled(string key)
		{
			var setting_path = string.Format(_AppSettingsEnabledFormat, key);
			var setting = ConfigurationManager.AppSettings.Get(setting_path);
			if (bool.TryParse(setting, out var rtn))
				return rtn;
			return false;
		}
		private static string GetSendMailModuleUser(string key)
		{
			var setting_path = string.Format(_AppSettingsSmtpUserFormat, key);
			var setting = ConfigurationManager.AppSettings.Get(setting_path);
			return setting;
		}
		private static string GetSendMailModulePassword(string key)
		{
			var setting_path = string.Format(_AppSettingsSmtpPasswordFormat, key);
			var setting = ConfigurationManager.AppSettings.Get(setting_path);
			return setting;
		}
		private static string GetSendMailModuleSender(string key)
		{
			var setting_path = string.Format(_AppSettingsSenderFormat, key);
			var setting = ConfigurationManager.AppSettings.Get(setting_path);
			return setting;
		}
		private static string GetSendMailModuleReceiver(string key)
		{
			var setting_path = string.Format(_AppSettingsReceiverFormat, key);
			var setting = ConfigurationManager.AppSettings.Get(setting_path);
			return setting;
		}
		#endregion
	}
}