///
/// Copyright (c) 2013-2020 Sensus Slovensko a.s.
///
using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using log4net;
using Common;
using TBF.Resources;

namespace TBF.UI.Settings
{
    /// <summary>
    /// Dialog to process test bench name and database settings (BenchSettings)
    /// </summary>
    public partial class DatabaseSettingsDlg : Form
    {
        static readonly ILog log = LogManager.GetLogger(typeof(DatabaseSettingsDlg));

        const string CredFileName = "tempfile";

        // Reference to bench DB settins (not a local copy)
        DatabaseSettings bench;

        string currentConfigDBConnStr;      /// Initialized in constructor by the parent
        string currentResultsDBConnStr;     /// Initialized in constructor by the parent
        string currentEventsDBConnStr;      /// Initialized in constructor by the parent
        public bool CurrentDBChanged;       /// Set when a current database is modified (erased or imported)


        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="bench">Test bench database settings</param>
        public DatabaseSettingsDlg(DatabaseSettings bench, string currentConfigDBConnStr, string currentResultsDBConnStr, string currentEventsDBConnStr)
        {
            this.bench = bench;
            this.currentConfigDBConnStr = currentConfigDBConnStr;
            this.currentResultsDBConnStr = currentResultsDBConnStr;
            this.currentEventsDBConnStr = currentEventsDBConnStr;
            CurrentDBChanged = false;

            InitializeComponent();
        }

		void Localize()
		{
			Text = Strings.Test_Bench_Databases_Specification;
			label1.Text = Strings.Test_bench_name;
			realBenchCheckBox.Text = Strings.Test_bench_is_controlled_by_this_computer;
			dbTypeLabel.Text = Strings.Database_type;
			connectionStringLabel.Text = Strings.Connection_string;

            configLabel.Text = Strings.Configuration;
            resultsLabel.Text = Strings.Results;
            usersLabel.Text = Strings.Users;

			testConnConfigDbBtn.Text = Strings.Test_connection;
			testConnResultsDbBtn.Text = Strings.Test_connection;
            testConnEventsDbBtn.Text = Strings.Test_connection;
            testConnUsersDbBtn.Text = Strings.Test_connection;

			createConfigDbBtn.Text = Strings.Create_DB;
			createResultsDbBtn.Text = Strings.Create_DB;
            createEventsDbBtn.Text = Strings.Create_DB;

            importConfigDbBtn.Text = Strings.Import_DB;
            importResultsDbBtn.Text = Strings.Import_DB;
            importEventsDbBtn.Text = Strings.Import_DB;

            okButton.Text = Strings.OkBtnText;
            cancelButton.Text = Strings.CancelBtnText;
        }

        private void BenchSettingsDlg_Load(object sender, EventArgs e)
        {
			Localize();

            benchNameTextBox.Text = bench.BenchName;
            realBenchCheckBox.Checked = bench.IsRealBench;

            /// Initialize 'Database type' combo-boxes
			for (int i = 0; i < (int)DBType.Count; i++)
            {
				DBType dbType = (DBType)i;
                configDbTypeComboBox.Items.Add(dbType);
                resultsDbTypeComboBox.Items.Add(dbType);
                eventsDbTypeComboBox.Items.Add(dbType);
                usersDbTypeComboBox.Items.Add(dbType);
            }
            configDbTypeComboBox.SelectedIndex = (int)bench.ProceduresDBSettings.DbType;
            resultsDbTypeComboBox.SelectedIndex = (int)bench.WaterMetersDBSettings.DbType;
            eventsDbTypeComboBox.SelectedIndex = (int)bench.EventsDBSettings.DbType;
            usersDbTypeComboBox.SelectedIndex = (int)bench.UsersDBSettings.DbType;

            /// Initialize connection strings
            configDbConnectionStringTextBox.Text = bench.ProceduresDBSettings.ConnectionString;
            resultsDbConnectionStringTextBox.Text = bench.WaterMetersDBSettings.ConnectionString;
            eventsDbConnectionStringTextBox.Text = bench.EventsDBSettings.ConnectionString;
            usersDbConnectionStringTextBox.Text = bench.UsersDBSettings.ConnectionString;
        }

        bool UpdateBenchFromUIControls()
        {
			/// TODO: The following code doesnot work as expected - error message shown!
			//for (int i = 0; i < Program.LocalSettings.BenchesCount; i++)
			//{
			//    if (bench != Program.LocalSettings.TestBenches[i] &&
			//        benchNameTextBox.Text == Program.LocalSettings.TestBenches[i].BenchName)
			//    {
			//        MessageBox.Show(Strings.Bench_name_conflict_Use_another_name_pls, Strings.Error, MessageBoxButtons.OK);
			//        return false;
			//    }
			//}

            bench.BenchName = benchNameTextBox.Text;
            bench.IsRealBench = realBenchCheckBox.Checked;

            bench.ProceduresDBSettings.ConnectionString = configDbConnectionStringTextBox.Text;
            bench.WaterMetersDBSettings.ConnectionString = resultsDbConnectionStringTextBox.Text;
            bench.EventsDBSettings.ConnectionString = eventsDbConnectionStringTextBox.Text;
            bench.UsersDBSettings.ConnectionString = usersDbConnectionStringTextBox.Text;

			bench.ProceduresDBSettings.DbType = (DBType)configDbTypeComboBox.SelectedIndex;
			bench.WaterMetersDBSettings.DbType = (DBType)resultsDbTypeComboBox.SelectedIndex;
            bench.EventsDBSettings.DbType = (DBType)eventsDbTypeComboBox.SelectedIndex;
            bench.UsersDBSettings.DbType = (DBType)usersDbTypeComboBox.SelectedIndex;

            return true;
        }

        /// <summary>
        /// Update bench DB setting, return 'OK'
        /// </summary>
        /// <param name="sender">Not used</param>
        /// <param name="e">Not used</param>
        private void okButton_Click(object sender, EventArgs e)
        {
            if (UpdateBenchFromUIControls())
            {
                DialogResult = DialogResult.OK;
                Close();
                return;
            }

            DialogResult = DialogResult.None;
        }

        /// <summary>
        /// Throw away changes, return 'Cancel'
        /// </summary>
        /// <param name="sender">Not used</param>
        /// <param name="e">Not used</param>
        private void cancelButton_Click(object sender, EventArgs e)
        {
            DialogResult = DialogResult.Cancel;
            Close();
        }


        private void testConnConfigDbBtn_Click(object sender, EventArgs e) { }
        private void testConnResultsDbBtn_Click(object sender, EventArgs e) { }
        private void testConnEventsDbBtn_Click(object sender, EventArgs e) { }
        private void testConnUsersDbBtn_Click(object sender, EventArgs e) { }


        private void createConfigDbBtn_Click(object sender, EventArgs e)
        {
            /// Update database connection strings
            if (!UpdateBenchFromUIControls()) return;

            if (DialogResult.OK == MessageBox.Show(Strings.DB_will_be_overwritten + Environment.NewLine +
                                                   Strings.Do_you_want_to_proceed, Strings.Warning,
                                                   MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation))
            {
                try
                {
                    string connectionString = bench.ProceduresDBSettings.ConnectionString;
                    string databaseName = Config.Utils.GetDBName(connectionString);
                    string userName = Config.Utils.GetDBUser(connectionString);
                    string password = Config.Utils.GetDBPassword(connectionString);         /// TODO: Use password

                    if (connectionString == currentConfigDBConnStr || connectionString == currentResultsDBConnStr || connectionString == currentEventsDBConnStr)
                    {
                        CurrentDBChanged = true;
                    }

                    Cursor.Current = Cursors.WaitCursor;

                    log.ErrorFormat("Going to create an empty configuration database '{0}'", databaseName);
                    ExecuteMySqlCmd(string.Format("DROP DATABASE `{0}`;", databaseName), userName, password);
                    ExecuteMySqlCmd(string.Format("CREATE DATABASE `{0}` CHARACTER SET utf8 COLLATE utf8_unicode_ci;", databaseName), userName, password);
                    TBF.DB.CreateEmptyConfigDB(bench.ProceduresDBSettings.DbType, connectionString);
                    log.ErrorFormat("An empty configuration database '{0}' was created", databaseName);

                    MessageBox.Show(Strings.DB_was_successfully_created, Strings.Notification);
                    Cursor.Current = Cursors.Default;
                    DialogResult = DialogResult.None;
                }
                catch (Exception exception)
                {
                    if (File.Exists(CredFileName)) File.Delete(CredFileName);
                    Cursor.Current = Cursors.Default;
                    string msg = string.Format("{0}{1}{2}", Strings.Error_while_creating_DB_Reason, Environment.NewLine, exception.Message);
                    if (exception.InnerException != null)
                    {
                        msg += Environment.NewLine + exception.InnerException.Message;
                    }
                    MessageBox.Show(msg, Strings.Error, MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        private void createResultsDbBtn_Click(object sender, EventArgs e)
        {
            /// Update database connection strings
            if (!UpdateBenchFromUIControls()) return;

            if (DialogResult.OK == MessageBox.Show(Strings.DB_will_be_overwritten + Environment.NewLine +
                                                   Strings.Do_you_want_to_proceed, Strings.Warning,
                                                   MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation))
            {
                try
                {
                    string connectionString = bench.WaterMetersDBSettings.ConnectionString;
                    string databaseName = Config.Utils.GetDBName(connectionString);
                    string userName = Config.Utils.GetDBUser(connectionString);
                    string password = Config.Utils.GetDBPassword(connectionString);         /// TODO: Use password

                    if (connectionString == currentConfigDBConnStr || connectionString == currentResultsDBConnStr || connectionString == currentEventsDBConnStr)
                    {
                        CurrentDBChanged = true;
                    }

                    Cursor.Current = Cursors.WaitCursor;

                    log.ErrorFormat("Going to create an empty results database '{0}'", databaseName);
                    ExecuteMySqlCmd(string.Format("DROP DATABASE `{0}`;", databaseName), userName, password);
                    ExecuteMySqlCmd(string.Format("CREATE DATABASE `{0}` CHARACTER SET utf8 COLLATE utf8_unicode_ci;", databaseName), userName, password);
                    global::Results.DB.DbType = bench.WaterMetersDBSettings.DbType;
                    global::Results.DB.ConnectionString = connectionString;
                    global::Results.DB.CreateEmptyDB();
                    log.ErrorFormat("An empty results database '{0}' was created", databaseName);

                    MessageBox.Show(Strings.DB_was_successfully_created, Strings.Notification);
                    Cursor.Current = Cursors.Default;
                    DialogResult = DialogResult.None;
                }
                catch (Exception exception)
                {
                    if (File.Exists(CredFileName)) File.Delete(CredFileName);
                    Cursor.Current = Cursors.Default;
                    string msg = string.Format("{0}{1}{2}", Strings.Error_while_creating_DB_Reason, Environment.NewLine, exception.Message);
                    if (exception.InnerException != null)
                    {
                        msg += Environment.NewLine + exception.InnerException.Message;
                    }
                    MessageBox.Show(msg, Strings.Error, MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        private void createEventsDbBtn_Click(object sender, EventArgs e)
        {
            /// Update database connection strings
            if (!UpdateBenchFromUIControls()) return;

            if (DialogResult.OK == MessageBox.Show(Strings.DB_will_be_overwritten + Environment.NewLine +
                                                   Strings.Do_you_want_to_proceed, Strings.Warning,
                                                   MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation))
            {
                try
                {
                    MessageBox.Show("Not implemented yet");

                    //string connectionString = bench.EventsDBSettings.ConnectionString;
                    //string databaseName = Config.Utils.GetDBName(connectionString);
                    //string userName = Config.Utils.GetDBUser(connectionString);
                    //string password = Config.Utils.GetDBPassword(connectionString);         /// TODO: Use password

                    //if (connectionString == currentConfigDBConnStr || connectionString == currentResultsDBConnStr || connectionString == currentEventsDBConnStr)
                    //{
                    //    CurrentDBChanged = true;
                    //}

                    //Cursor.Current = Cursors.WaitCursor;

                    //log.ErrorFormat("Going to create an empty events database '{0}'", databaseName);
                    //ExecuteMySqlCmd(string.Format("DROP DATABASE `{0}`;", databaseName), userName, password);
                    //ExecuteMySqlCmd(string.Format("CREATE DATABASE `{0}` CHARACTER SET utf8 COLLATE utf8_unicode_ci;", databaseName), userName, password);
                    //global::Events.DB.DbType = (DBType)bench.EventsDBSettings.DbType;
                    //global::Events.DB.ConnectionString = connectionString;
                    //global::Events.DB.CreateEmptyDB();
                    //log.ErrorFormat("An empty events database '{0}' was created", databaseName);

                    //MessageBox.Show(Strings.DB_was_successfully_created, Strings.Notification);
                    //Cursor.Current = Cursors.Default;
                    //DialogResult = DialogResult.None;
                }
                catch (Exception exception)
                {
                    if (File.Exists(CredFileName)) File.Delete(CredFileName);
                    Cursor.Current = Cursors.Default;
                    string msg = string.Format("{0}{1}{2}", Strings.Error_while_creating_DB_Reason, Environment.NewLine, exception.Message);
                    if (exception.InnerException != null)
                    {
                        msg += Environment.NewLine + exception.InnerException.Message;
                    }
                    MessageBox.Show(msg, Strings.Error, MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        /// <summary>
        /// Configuration database import (UI)
        /// </summary>
        private void importConfigDbBtn_Click(object sender, EventArgs e)
        {
            /// Update database connection strings from UI
            if (!UpdateBenchFromUIControls()) return;

            string connectionString = bench.ProceduresDBSettings.ConnectionString;

            string server = Config.Utils.GetDBServer(connectionString);
            if ((server != "localhost") && (server != "127.0.0.1"))
            {
                MessageBox.Show(Strings.Remote_database_cannot_be_imported, string.Empty, MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            OpenFileDialog dlg = new OpenFileDialog();
            dlg.InitialDirectory = string.Format(@"C:\TBF\DbBackups\");
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                if (MessageBox.Show(string.Format(Strings.Do_you_want_to_restore_configuration_DB_from_file_0_qm, dlg.FileName),
                                    string.Empty,
                                    MessageBoxButtons.YesNo,
                                    MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    DBImportMessageStart("Importing database with configuration");
                    ImportDatabase(connectionString, dlg.FileName);
                    DBImportMessageEnd();
                }
            }
        }

        /// <summary>
        /// Results database import (UI)
        /// </summary>
        private void importResultsDbBtn_Click(object sender, EventArgs e)
        {
            /// Update database connection strings from UI
            if (!UpdateBenchFromUIControls()) return;

            string connectionString = bench.WaterMetersDBSettings.ConnectionString;

            string server = Config.Utils.GetDBServer(connectionString);
            if ((server != "localhost") && (server != "127.0.0.1"))
            {
                MessageBox.Show(Strings.Remote_database_cannot_be_imported, string.Empty, MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            OpenFileDialog dlg = new OpenFileDialog();
            dlg.InitialDirectory = string.Format(@"C:\TBF\DbBackups\");
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                if (MessageBox.Show(string.Format(Strings.Do_you_want_to_restore_results_DB_from_file_0_qm, dlg.FileName),
                                    string.Empty,
                                    MessageBoxButtons.YesNo,
                                    MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    DBImportMessageStart("Importing DB with Results");
                    ImportDatabase(connectionString, dlg.FileName);
                    DBImportMessageEnd();
                }
            }
        }

        private void importEventsDbBtn_Click(object sender, EventArgs e)
        {
            /// Update database connection strings from UI
            if (!UpdateBenchFromUIControls()) return;

            string connectionString = bench.EventsDBSettings.ConnectionString;

            string server = Config.Utils.GetDBServer(connectionString);
            if ((server != "localhost") && (server != "127.0.0.1"))
            {
                MessageBox.Show(Strings.Remote_database_cannot_be_imported, string.Empty, MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            OpenFileDialog dlg = new OpenFileDialog();
            dlg.InitialDirectory = string.Format(@"C:\TBF\DbBackups\");
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                if (MessageBox.Show(string.Format(Strings.Do_you_want_to_restore_events_DB_from_file_0_qm, dlg.FileName),
                                    string.Empty,
                                    MessageBoxButtons.YesNo,
                                    MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    DBImportMessageStart("Importing DB with Events");
                    ImportDatabase(connectionString, dlg.FileName);
                    DBImportMessageEnd();
                }
            }
        }

        Shared.ModelessActivityForm form;
        System.Threading.Thread formThread;
        /// 
        void DBImportMessageStart(string message)
        {
            form = new Shared.ModelessActivityForm()
            {
                Message = message,
                FontFamily = "Arial",
                FontSize = 24,
                FontStyle = FontStyle.Regular,
                BackgroundColor = Color.RoyalBlue,
            };
            formThread = new System.Threading.Thread(() => form.ShowDialog());
            formThread.Start();
        }
        /// 
        void DBImportMessageEnd()
        {
            if (form != null && formThread != null)
            {
                form.CloseForm(null, new EventArgs());
                formThread.Join();
            }
            form = null;
            formThread = null;
        }


        /// <summary>
        /// Database import (functionality)
        /// Invokes:
        ///     mysql -u[userName] --default-character-set=utf8 --database [databaseName]
        ///     SOURCE {SQL file name]
        /// </summary>
        /// <param name="connectionString">DB connection string</param>
        /// <param name="outputFileName">Output file name</param>
        void ImportDatabase(string connectionString, string inputFileName)
        {
            string databaseName = Config.Utils.GetDBName(connectionString);
            string userName = Config.Utils.GetDBUser(connectionString);
            string password = Config.Utils.GetDBPassword(connectionString);     /// TODO: Use password

            try
            {
                if (connectionString == currentConfigDBConnStr || connectionString == currentResultsDBConnStr || connectionString == currentEventsDBConnStr)
                {
                    CurrentDBChanged = true;
                }

                log.ErrorFormat("Going to import database '{0}' from file {1}", databaseName, inputFileName);
                ExecuteMySqlCmd(string.Format("DROP DATABASE `{0}`;", databaseName), userName, password);
                ExecuteMySqlCmd(string.Format("CREATE DATABASE `{0}` CHARACTER SET utf8 COLLATE utf8_unicode_ci;", databaseName), userName, password);
                ExecuteMySqlCmd(string.Format("SOURCE {0}", inputFileName), userName, password, databaseName);
                log.ErrorFormat("Database {0} was imported from file {1}", databaseName, inputFileName);
            }
            catch (Exception exc)
            {
                if (File.Exists(CredFileName)) File.Delete(CredFileName);
                log.FatalFormat("Failed to import database '{0}' from file {1}: {2}", databaseName, inputFileName, exc.Message);
            }
        }


        /// <summary>
        /// Execute a MySQL command line command without specifying a database
        /// </summary>
        /// <param name="command">MySQL command</param>
        /// <param name="userName">User name</param>
        void ExecuteMySqlCmd(string command, string userName, string password)
        {
            ExecuteMySqlCmd(command, userName, password, null);
        }

        /// <summary>
        /// Execute a MySQL command line command, specify database to be used
        /// </summary>
        /// <param name="command">MySQL command</param>
        /// <param name="userName">User name</param>
        /// <param name="databaseToBeUsed">Database name</param>
        void ExecuteMySqlCmd(string command, string userName, string password, string databaseToBeUsed)
        {
            using (TextWriter writer = new StreamWriter(CredFileName))
            {
                writer.WriteLine("[client]");
                writer.WriteLine(string.Format("password=\"{0}\"", password));
            }

            System.Diagnostics.Process proc = new System.Diagnostics.Process();

            proc.StartInfo.FileName = @"C:\xampp\mysql\bin\mysql.exe";
            if (string.IsNullOrEmpty(databaseToBeUsed))
            {
                proc.StartInfo.Arguments = string.Format("--defaults-file={0} --user={1} --host=localhost --protocol=tcp --port=3306 --default-character-set=utf8", CredFileName, userName);
            }
            else
            {
                proc.StartInfo.Arguments = string.Format("--defaults-file={0} --user={1} --host=localhost --protocol=tcp --port=3306 --default-character-set=utf8 --database={2}", CredFileName, userName, databaseToBeUsed);
            }
            proc.StartInfo.UseShellExecute = false;         /// Must be false to redirect standard input or standard output
            proc.StartInfo.RedirectStandardOutput = false;
            proc.StartInfo.RedirectStandardInput = true;
            proc.StartInfo.CreateNoWindow = false;
            //proc.StartInfo.Verb = "runas";                /// To run mysql.exe as administrator

            proc.Start();
            proc.StandardInput.WriteLine(command);
            System.Diagnostics.Debug.WriteLine(command);
            log.Warn(command);
            proc.StandardInput.WriteLine("exit");
            proc.WaitForExit();

            File.Delete(CredFileName);
        }
    }
}