using System;
using System.Drawing;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace BizTalkCheckmkPulse.Setup
{
    internal sealed class MainForm : Form
    {
        private readonly InstallerEngine engine;
        private readonly TextBox account = new TextBox();
        private readonly TextBox password = new TextBox();
        private readonly ComboBox environment = new ComboBox();
        private readonly CheckBox gmsa = new CheckBox();
        private readonly CheckBox allowServiceNameChange = new CheckBox();
        private readonly Button install = new Button();
        private readonly Button uninstall = new Button();
        private readonly TextBox status = new TextBox();

        public MainForm(InstallerEngine engine)
        {
            this.engine = engine;
            Text = "BizTalk Checkmk Pulse Setup";
            ClientSize = new Size(650, 535);
            MinimumSize = new Size(666, 574);
            StartPosition = FormStartPosition.CenterScreen;
            Font = new Font("Segoe UI", 9F);

            var title = new Label
            {
                AutoSize = true,
                Font = new Font(Font.FontFamily, 15F, FontStyle.Bold),
                Location = new Point(20, 18),
                Text = "BizTalk Checkmk Pulse installieren"
            };
            var description = new Label
            {
                AutoSize = false,
                Location = new Point(22, 58),
                Size = new Size(605, 48),
                Text = "Installiert Anwendung, Checkmk Local Check, sichere Verzeichnisrechte und den minuetlichen Scheduled Task. PowerShell wird nicht verwendet."
            };

            AddLabel("Collector-Konto", 22, 120);
            account.Location = new Point(190, 116);
            account.Size = new Size(420, 23);
            account.Text = @"BEW\t231bizmon";

            AddLabel("Kennwort", 22, 158);
            password.Location = new Point(190, 154);
            password.Size = new Size(420, 23);
            password.UseSystemPasswordChar = true;

            AddLabel("Umgebung", 22, 196);
            environment.Location = new Point(190, 192);
            environment.Size = new Size(160, 23);
            environment.DropDownStyle = ComboBoxStyle.DropDownList;
            environment.Items.AddRange(new object[] { "(keine)", "ACC", "DEV", "TST", "PRD" });
            var installedEnvironment = engine.GetInstalledEnvironment();
            var installedIndex = environment.Items.IndexOf(installedEnvironment);
            environment.SelectedIndex = installedIndex >= 0 ? installedIndex : 0;

            gmsa.Location = new Point(190, 229);
            gmsa.Size = new Size(420, 24);
            gmsa.Text = "Konto ist ein gMSA (kein Kennwort erforderlich)";
            gmsa.CheckedChanged += delegate
            {
                password.Enabled = !gmsa.Checked;
                if (gmsa.Checked) password.Clear();
            };

            allowServiceNameChange.Location = new Point(190, 262);
            allowServiceNameChange.Size = new Size(420, 34);
            allowServiceNameChange.Text = "Service-Rename ist beabsichtigt; Checkmk Service Discovery ist eingeplant";
            allowServiceNameChange.Enabled = engine.IsInstalled;

            install.Location = new Point(190, 306);
            install.Size = new Size(200, 34);
            install.Text = "Installieren / aktualisieren";
            install.Click += async delegate { await InstallAsync(); };

            uninstall.Location = new Point(410, 306);
            uninstall.Size = new Size(200, 34);
            uninstall.Text = "Deinstallieren";
            uninstall.Click += async delegate { await UninstallAsync(); };

            status.Location = new Point(22, 359);
            status.Size = new Size(588, 146);
            status.Multiline = true;
            status.ReadOnly = true;
            status.ScrollBars = ScrollBars.Vertical;
            status.Text = engine.IsInstalled
                ? "Bestehende Installation erkannt. Update behaelt Runtime-Daten und vorhandene Konfigurationswerte bei; Konto und Kennwort werden fuer den Scheduled Task neu bestaetigt."
                : "Bereit. Setup.exe muss aus dem vollstaendig entpackten Installationspaket gestartet werden.";

            Controls.AddRange(new Control[]
            {
                title, description, account, password, environment, gmsa, allowServiceNameChange, install, uninstall, status
            });
            AcceptButton = install;
        }

        private void AddLabel(string text, int left, int top)
        {
            Controls.Add(new Label { AutoSize = true, Location = new Point(left, top), Text = text });
        }

        private async Task InstallAsync()
        {
            var collectorAccount = account.Text.Trim();
            var collectorPassword = password.Text;
            var environmentName = environment.SelectedIndex <= 0 ? string.Empty : environment.SelectedItem.ToString();
            var collectorIsGmsa = gmsa.Checked;

            SetBusy(true, "Installation laeuft ...");
            try
            {
                await Task.Run(() => engine.Install(
                    collectorAccount,
                    collectorPassword,
                    collectorIsGmsa,
                    environmentName,
                    allowServiceNameChange.Checked,
                    Report));
                password.Clear();
                Report("Installation abgeschlossen. Der Provider-Task wurde einmalig gestartet.");
                MessageBox.Show(this, "Installation erfolgreich abgeschlossen.", Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                password.Clear();
                Report("FEHLER: " + ex.Message);
                MessageBox.Show(this, ex.Message, "Installation fehlgeschlagen", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                SetBusy(false, null);
            }
        }

        private async Task UninstallAsync()
        {
            var result = MessageBox.Show(
                this,
                "Scheduled Task, Checkmk-Wrapper und Programmdateien entfernen? Snapshot und Logs bleiben erhalten.",
                "Deinstallation bestaetigen",
                MessageBoxButtons.YesNo,
                MessageBoxIcon.Warning);
            if (result != DialogResult.Yes) return;

            SetBusy(true, "Deinstallation laeuft ...");
            try
            {
                await Task.Run(() => engine.Uninstall(true, Report));
                Report("Deinstallation abgeschlossen. Runtime-Daten wurden beibehalten.");
                MessageBox.Show(this, "Deinstallation erfolgreich abgeschlossen.", Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                Report("FEHLER: " + ex.Message);
                MessageBox.Show(this, ex.Message, "Deinstallation fehlgeschlagen", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                SetBusy(false, null);
            }
        }

        private void SetBusy(bool busy, string message)
        {
            install.Enabled = !busy;
            uninstall.Enabled = !busy;
            account.Enabled = !busy;
            environment.Enabled = !busy;
            gmsa.Enabled = !busy;
            allowServiceNameChange.Enabled = !busy && engine.IsInstalled;
            password.Enabled = !busy && !gmsa.Checked;
            UseWaitCursor = busy;
            if (message != null) Report(message);
        }

        private void Report(string message)
        {
            if (InvokeRequired)
            {
                BeginInvoke(new Action<string>(Report), message);
                return;
            }

            status.AppendText(Environment.NewLine + DateTime.Now.ToString("HH:mm:ss") + "  " + message);
        }
    }
}