using System;

namespace Pilz.Configuration
{
    public class AutoSaveConfigurationManager : ConfigurationManager
    {
        private bool addedHandler = false;
        private bool enableAutoSave = false;
        private string _ConfigFilePath = string.Empty;
        private bool _AutoLoadConfigOnAccess = false;

        public string ConfigFilePath
        {
            get
            {
                return _ConfigFilePath;
            }

            set
            {
                _ConfigFilePath = value;
                if (AutoLoadConfigOnAccess)
                    Load();
            }
        }

        public bool AutoLoadConfigOnAccess
        {
            get
            {
                return _AutoLoadConfigOnAccess;
            }

            set
            {
                _AutoLoadConfigOnAccess = value;
                if (value)
                    Load();
            }
        }

        public bool AutoSaveConfigOnExit
        {
            get
            {
                return enableAutoSave;
            }

            set
            {
                if (enableAutoSave != value)
                {
                    enableAutoSave = value;
                    switch (enableAutoSave)
                    {
                        case true:
                            {
                                AddAutoSaveHandler();
                                break;
                            }

                        case false:
                            {
                                RemoveAutoSaveHandler();
                                break;
                            }
                    }
                }
            }
        }

        private void AddAutoSaveHandler()
        {
            if (!addedHandler)
            {
                System.Windows.Forms.Application.ApplicationExit += AutoSaveSettingsOnExit;
                addedHandler = true;
            }
        }

        private void RemoveAutoSaveHandler()
        {
            System.Windows.Forms.Application.ApplicationExit -= AutoSaveSettingsOnExit;
            addedHandler = false;
        }

        private void AutoSaveSettingsOnExit(object sender, EventArgs e)
        {
            Save();
        }

        private void Save()
        {
            if (!string.IsNullOrEmpty(ConfigFilePath) && Configuration is object)
            {
                Configuration.WriteToFile(ConfigFilePath);
            }
        }

        private void Load()
        {
            if (!string.IsNullOrEmpty(ConfigFilePath))
            {
                Configuration.ReadFromFile(ConfigFilePath);
            }
        }

        ~AutoSaveConfigurationManager()
        {
            RemoveAutoSaveHandler();
        }
    }
}