using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data.SqlClient;
using System.Linq;
using System.Security.Principal;
using Microsoft.Win32;
using LocalSQLDB.Properties;

namespace LocalSQLDB
{
    public class LocalDBPrepare
    {
        public LocalDBPrepare(string targetDir, Version productVersion)
        {
            _targetDir = targetDir;
            _installingVersion = productVersion;
        }

        static string _targetDir = string.Empty;
        static Version _installingVersion = new Version();

        private Configuration _newConfig;
        private SettingElementCollection _newSettings = new SettingElementCollection();
        private Dictionary<string, string> _newSettingsDictionary = new Dictionary<string, string>();

        private enum DbType
        {
            Centralized = 0,
            Local = 1
        }

        private enum ConfigSettings
        {
            DBType,
            LocalDbHost,
            DBName,
            UseNTLMAuthentication,
            LocalDBUser,
            LocalDBPassword
        }

        public bool PrepareDB()
        {
            //Only attach to SqlLocalDb if DataPRO will be using a local (not centralized) database
            GetNewConfig();

            var dbType = DbType.Local;
            try
            {
                DbType intDbType;
                if (Enum.TryParse(_newSettingsDictionary[ConfigSettings.DBType.ToString()], out intDbType))
                {
                    switch (intDbType)
                    {
                        case DbType.Centralized:
                            dbType = DbType.Centralized;
                            break;
                        case DbType.Local:
                        default:
                            dbType = DbType.Local;
                            break;
                    }
                }
                else
                {
                    dbType = DbType.Local;
                }
            }
            catch
            {
                dbType = DbType.Local;
            }

            if (dbType == DbType.Centralized)
            {
                return false;
            }

            var dbName = Settings.Default.DataPRO;
            try { dbName = _newSettingsDictionary[ConfigSettings.DBName.ToString()]; }
            catch { dbName = Settings.Default.DataPRO; }

            if (string.Equals(dbName, Settings.Default.DataPRO, StringComparison.CurrentCultureIgnoreCase)) return true;

            var dbFileName = System.IO.Path.Combine(_targetDir, Settings.Default.LocalDbFolder, dbName + Settings.Default.Mdf);
            var dbFileLogName = System.IO.Path.Combine(_targetDir, Settings.Default.LocalDbFolder, dbName + Settings.Default.LogLdf);

            var sourceFileName = string.Empty;
            //if (_newSettingsDictionary[ConfigSettings.DBCopy.ToString()])
            //{
            string mostRecentlyInstalledLowerVersion;
            var mostRecentlyInstalledSubKeyName = Common.PreviousInstall.GetMostRecentlyInstalledSubKeyName(_installingVersion, out mostRecentlyInstalledLowerVersion);
            if (mostRecentlyInstalledSubKeyName == string.Empty) return false;
            //if (_newSettingsDictionary[ConfigSettings.DBCopy.ToString()])
            //{
                var _previousDir = Common.PreviousInstall.GetMostRecentlyInstalledPath(mostRecentlyInstalledSubKeyName);
                sourceFileName = System.IO.Path.Combine(_previousDir, Settings.Default.LocalDbFolder, Settings.Default.DataPRO + Settings.Default.Mdf);
            //}
            //else
            //{
                sourceFileName = System.IO.Path.Combine(_targetDir, Settings.Default.LocalDbFolder, Settings.Default.DataPRO + Settings.Default.Mdf);
            //}
            System.IO.File.Copy(sourceFileName, dbFileName);
            //System.IO.File.Delete(sourceFileName);

            //if (_newSettingsDictionary[ConfigSettings.DBCopy.ToString()])
            //{
            //    sourceFileName = System.IO.Path.Combine(_previousDir, Settings.Default.LocalDbFolder, Settings.Default.DataPRO + Settings.Default.LogLdf);
            //}
            //else
            //{
                sourceFileName = System.IO.Path.Combine(_targetDir, Settings.Default.LocalDbFolder, Settings.Default.DataPRO + Settings.Default.LogLdf);
            //}
            System.IO.File.Copy(sourceFileName, dbFileLogName);
            //System.IO.File.Delete(sourceFileName);
            return true;
        }

        private void GetNewConfig()
        {
            var newPath = string.Empty;
            //Open the new config file just installed
            newPath = _targetDir + Settings.Default.RegistryDataPROExe;
            _newConfig = ConfigurationManager.OpenExeConfiguration(@newPath);
            _newSettings = GetConfigApplicationSettings();
            _newSettingsDictionary = _newSettings.Cast<SettingElement>().ToDictionary(newSetting => newSetting.Name, newSetting => newSetting.Value.ValueXml.InnerXml);
        }

        private SettingElementCollection GetConfigApplicationSettings()
        {
            var configurationSectionGroup = _newConfig.SectionGroups[Settings.Default.ApplicationSettings];
            if (configurationSectionGroup == null) return null;
            var clientSettingsSection = configurationSectionGroup.Sections[0] as System.Configuration.ClientSettingsSection;
            return clientSettingsSection != null ? clientSettingsSection.Settings : null;
        }
    }
}