using System;
using System.Windows.Forms;

namespace TBF
{
    /// <summary>
    /// Dialog to edit local settings that specify database parameters (S1.2)
    /// </summary>
    public partial class BenchesDlg : Form
    {
        // Local copy of 'local settings' initialized to Program.localSettings.
        // Dialog modifies this copy and updates Program.localSettings just
        // when 'OK' is pressed.
        LocalSettings localSettings;

        /// <summary>
        /// Constructor, initializes the dialog
        /// </summary>
        public BenchesDlg()
        {
            localSettings = new LocalSettings();
            localSettings.Assign(Program.LocalSettings);

            InitializeComponent();
            RedrawTestBenchesListBox();
        }

        void RedrawTestBenchesListBox()
        {
            testBenchesListBox.Items.Clear();
            if (localSettings.testBenches != null)
            {
                int nrBenches = localSettings.testBenches.GetLength(0);
                for (int i = 0; i < nrBenches; i++)
                {
                    testBenchesListBox.Items.Add(localSettings.testBenches[i].BenchName);
                }
            }
        }

        /// <summary>
        /// Create a new test bench DB specification and append it to the list
        /// </summary>
        /// <param name="sender">Not used</param>
        /// <param name="e">Not used</param>
        private void addButton_Click(object sender, EventArgs e)
        {
            DatabaseSettings bench = new DatabaseSettings();
            DatabaseSettingsDlg dlg = new DatabaseSettingsDlg(bench);
            DialogResult dr = dlg.ShowDialog();
            if (dr == DialogResult.OK)
            {
                int nrBenches =
                    (localSettings.testBenches == null) ? 0 : localSettings.testBenches.GetLength(0);

                if (nrBenches == 0)
                {
                    localSettings.testBenches = new DatabaseSettings[1];
                    localSettings.testBenches[0] = bench;
                }
                else
                {
                    DatabaseSettings[] newTestBenches = new DatabaseSettings[nrBenches + 1];
                    for (int i = 0; i < nrBenches; i++)
                    {
                        newTestBenches[i] = localSettings.testBenches[i];
                    }
                    newTestBenches[nrBenches] = bench;
                    localSettings.testBenches = newTestBenches;
                }

                testBenchesListBox.Items.Add(bench.BenchName);
            }
        }

        /// <summary>
        /// Create a new test bench DB specification,which is a copy of the
        /// selected bench, and append it to the list
        /// </summary>
        /// <param name="sender">Not used</param>
        /// <param name="e">Not used</param>
        private void copyButton_Click(object sender, EventArgs e)
        {
            if (testBenchesListBox.SelectedIndex >= 0)
            {
                DatabaseSettings ori = localSettings.testBenches[testBenchesListBox.SelectedIndex];
                DatabaseSettings bench = (DatabaseSettings)ori.Clone();

                DatabaseSettingsDlg dlg = new DatabaseSettingsDlg(bench);
                DialogResult dr = dlg.ShowDialog();
                if (dr == DialogResult.OK)
                {
                    int nrBenches =
                        (localSettings.testBenches == null) ? 0 : localSettings.testBenches.GetLength(0);

                    DatabaseSettings[] newTestBenches = new DatabaseSettings[nrBenches + 1];
                    for (int i = 0; i < nrBenches; i++)
                    {
                        newTestBenches[i] = localSettings.testBenches[i];
                    }
                    newTestBenches[nrBenches] = bench;
                    localSettings.testBenches = newTestBenches;

                    testBenchesListBox.Items.Add(bench.BenchName);
                }
            }
        }

        /// <summary>
        /// Edit selected test bench DB specification
        /// </summary>
        /// <param name="sender">Not used</param>
        /// <param name="e">Not used</param>
        private void editButton_Click(object sender, EventArgs e)
        {
            if (testBenchesListBox.SelectedIndex >= 0)
            {
                DatabaseSettingsDlg dlg = new DatabaseSettingsDlg(localSettings.testBenches[testBenchesListBox.SelectedIndex]);
                DialogResult dr = dlg.ShowDialog();
                if (dr == DialogResult.OK)
                {
                    // Update the item name
                    testBenchesListBox.Items[testBenchesListBox.SelectedIndex] =
                        localSettings.testBenches[testBenchesListBox.SelectedIndex].BenchName;
                }
            }
        }

        /// <summary>
        /// Remove selected test bench DB specification from the list
        /// </summary>
        /// <param name="sender">Not used</param>
        /// <param name="e">Not used</param>
        private void removeButton_Click(object sender, EventArgs e)
        {
            int selectedIx = testBenchesListBox.SelectedIndex;
            if (selectedIx >= 0)
            {
                int nrBenches =
                    (localSettings.testBenches == null) ? 0 : localSettings.testBenches.GetLength(0);

                if (nrBenches == 1)
                {
                    localSettings.testBenches = null;
                }
                else
                {
                    DatabaseSettings[] newTestBenches = new DatabaseSettings[nrBenches - 1];
                    for (int i = 0; i < selectedIx; i++)
                    {
                        newTestBenches[i] = localSettings.testBenches[i];
                    }
                    for (int i = selectedIx + 1; i < nrBenches; i++)
                    {
                        newTestBenches[i - 1] = localSettings.testBenches[i];
                    }
                    localSettings.testBenches = newTestBenches;
                }

                RedrawTestBenchesListBox();
            }
        }

        /// <summary>
        /// Update setting, return 'OK'
        /// </summary>
        /// <param name="sender">Not used</param>
        /// <param name="e">Not used</param>
        private void okButton_Click(object sender, EventArgs e)
        {
            Program.LocalSettings.Assign(localSettings);    // Update Program.localSettings
            DialogResult = DialogResult.OK;
            Close();
            return;
        }

        /// <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();
            return;
        }

        /// <summary>
        /// Double click on an item = edit item
        /// </summary>
        /// <param name="sender">Not used</param>
        /// <param name="e">Not used</param>
        private void testBenchesListBox_DoubleClick(object sender, EventArgs e)
        {
            editButton_Click(sender, e);
        }
    }
}