using System;
using System.IO;
using Newtonsoft.Json.Linq;

namespace SecureCore
{
    public static class AppSettingsManager
    {
        private static JObject Settings { get; set; }
        private static string AppSettingsPath { get; } = Path.Combine(Directory.GetCurrentDirectory(), "appsettings.json");

        public static bool TryGetConnectionString(string connectionStringName, out string connectionString)
        {
            connectionString = string.Empty;

            try
            {
                var token = Settings.SelectToken($"ConnectionStrings.{connectionStringName}");

                if (token == null) return false;

                connectionString = token.ToObject<string>();

                if (!string.IsNullOrEmpty(connectionString)) return true;
                else return false;
            }
            catch { return false; }
        }

        public static bool TryGetSettingString(string keyPath, out string setting)
        {
            setting = string.Empty;

            try
            {
                var token = Settings.SelectToken(keyPath);

                if (token == null) return false;

                setting = token.ToObject<string>();

                if(!string.IsNullOrEmpty(setting)) return true;
                else return false;
            }
            catch { return false; }
        }

        public static bool TryGetSettingInt(string keyPath, out int setting)
        {
            setting = 0;

            try
            {
                var token = Settings.SelectToken(keyPath);

                if (token == null) return false;

                if (int.TryParse(token.ToObject<string>(), out setting)) return true;
                else return false;
            }
            catch { return false; }
        }

        public static void InitializeSettings()
        {
            if (Settings != null) throw new InvalidOperationException("The in memory JSON settings have already been loaded. Operation aborted.");
            if (!File.Exists(AppSettingsPath)) throw new FileNotFoundException($"The app settings file '{AppSettingsPath}' couldn't be found.");

            try
            {
                using var reader = new StreamReader(AppSettingsPath);

                Settings = JObject.Parse(reader.ReadToEnd());

                reader.Close();
            }
            catch
            {
                throw;
            }
        }
    }
}