using System;
using System.IO;
using System.Reflection;
using System.Windows.Forms;
using BulkArchiveMailer.AddIn.UI;
using BulkArchiveMailer.Core;
using Office = Microsoft.Office.Core;

namespace BulkArchiveMailer.AddIn
{
    /// <summary>
    /// Backs the single "Массовая рассылка" ribbon button declared in
    /// Ribbon.xml (raw Ribbon XML + callbacks approach, not the Ribbon
    /// Designer visual item - keeps everything in one small readable
    /// file). Wired up via ThisAddIn.CreateRibbonExtensibilityObject().
    /// </summary>
    [System.Runtime.InteropServices.ComVisible(true)]
    public class RibbonController : Office.IRibbonExtensibility
    {
        private Office.IRibbonUI ribbon;

        public string GetCustomUI(string ribbonId)
        {
            return GetEmbeddedResourceText("BulkArchiveMailer.AddIn.Ribbon.xml");
        }

        public void Ribbon_Load(Office.IRibbonUI ribbonUi)
        {
            ribbon = ribbonUi;
        }

        /// <summary>
        /// The button's onAction callback. Opens SettingsForm first if the
        /// archive folder is not configured yet (or does not exist);
        /// otherwise jumps straight to PreviewForm. Kept deliberately
        /// simple - see README.md for the reasoning.
        /// </summary>
        public void OnOpenBulkSenderButtonClick(Office.IRibbonControl control)
        {
            try
            {
                var settings = AppSettings.Load();
                var outlookApplication = Globals.ThisAddIn.OutlookApplication;

                if (string.IsNullOrWhiteSpace(settings.ArchiveFolder) || !Directory.Exists(settings.ArchiveFolder))
                {
                    using (var settingsForm = new SettingsForm(outlookApplication))
                    {
                        settingsForm.ShowDialog();
                    }

                    return;
                }

                using (var previewForm = new PreviewForm(outlookApplication))
                {
                    previewForm.ShowDialog();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(
                    "Не удалось открыть окно массовой рассылки: " + ex.Message,
                    "BulkArchiveMailer",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Error);
            }
        }

        private static string GetEmbeddedResourceText(string resourceName)
        {
            var asm = Assembly.GetExecutingAssembly();
            foreach (var name in asm.GetManifestResourceNames())
            {
                if (string.Equals(name, resourceName, StringComparison.OrdinalIgnoreCase))
                {
                    using (var stream = asm.GetManifestResourceStream(name))
                    {
                        if (stream == null)
                        {
                            return null;
                        }

                        using (var reader = new StreamReader(stream))
                        {
                            return reader.ReadToEnd();
                        }
                    }
                }
            }

            return null;
        }
    }
}