using Bovender.Mvvm.Actions;
/* Commands.cs
 * part of zaaReloaded2
 * 
 * Copyright 2015-2017 Daniel Kraus
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using zaaReloaded2.Controller;
using zaaReloaded2.Controller.Comments;
using zaaReloaded2.Formatter;
using zaaReloaded2.Importer.ZaaImporter;
using zaaReloaded2.ViewModels;
using zaaReloaded2.Views;
using Word = Microsoft.Office.Interop.Word;

namespace zaaReloaded2
{
    /// <summary>
    /// 
    /// </summary>
    static class Commands
    {
        #region Command methods

        public static void Format()
        {
            if (CanFormat())
            {
                SettingsRepository repository = SettingsRepository.Load();
                Guid lastSettingsUid = UserSettings.Default.LastSettings;
                Settings lastSettings = repository.FindByGuid(lastSettingsUid);
                if (lastSettings != null)
                {
                    DoFormat(lastSettings);
                }
                else
                {
                    ChooseSettings();
                }
            }
        }

        public static bool CanFormat()
        {
            return Globals.ThisAddIn.Application.ActiveDocument != null;
            //Word.Selection s = Globals.ThisAddIn.Application.ActiveWindow.Selection;
            //return s.Paragraphs.Count > 1 || 
            //    (s.Text.Length > 1 && s.Text.EndsWith("\r"));
        }

        public static void ChooseSettings()
        {
            SettingsRepository repository = SettingsRepository.Load();
            SettingsRepositoryViewModel vm = new SettingsRepositoryViewModel(repository);
            vm.UseSettingsMessage.Sent += (sender, args) =>
            {
                SettingsViewModel settingsVM = args.Content.ViewModel as SettingsViewModel;
                Settings settings = settingsVM.RevealModelObject() as Settings;
                DoFormat(settings);
                UserSettings.Default.LastSettings = settings.Uid;
            };
            vm.InjectInto<SettingsRepositoryView>().ShowDialog();
        }

        /// <summary>
        /// Loads the embedded demo document.
        /// </summary>
        /// <remarks>
        /// If Word is running in an embedded environment (e.g. in the ZAA),
        /// adding a document causes a COMException. Unfortunately, it is
        /// not trivial to test if Word is running embedded, so we use a
        /// try...catch structure and catch all COMExceptions. The error
        /// message might be not quite right if the exception was caused by
        /// a different problem.
        /// See http://davecra.com/2013/04/10/how-to-determine-if-an-excel-workbook-is-embedded-and-more
        /// </remarks>
        public static void LoadDemo()
        {
            try
            {
                Demo.Demo.OpenDemoDocument();
            }
            catch (System.Runtime.InteropServices.COMException e)
            {
                // HRESULT comparison according to http://stackoverflow.com/a/1426198/270712
                // Fix for exception ID 65a5c34e
                if (e.ErrorCode == unchecked((int)0x800A11FD))
                {
                    NotificationAction a = new NotificationAction();
                    a.Caption = "Kann Demo-Dokument nicht laden";
                    a.Message = "Das Demo-Dokument kann nicht geladen werden, "
                        + "wenn Word in der Zentralen Arztbriefablage ausgeführt wird.\r"
                        + "Bitte Word als eigenständige Anwendung starten und dann "
                        + "noch einmal versuchen.";
                    a.OkButtonText = "Schließen";
                    a.Invoke();
                }
                else
                {
                    throw;
                }
            }

        }

        public static void ShowAbout()
        {
            ViewModels.AboutViewModel vm = new ViewModels.AboutViewModel();
            vm.InjectInto<Views.AboutView>().ShowDialog();
        }

        public static void ShowPreferences()
        {
            ViewModels.PreferencesViewModel vm = new PreferencesViewModel();
            vm.InjectInto<Views.PreferencesView>().ShowDialog();
        }

        public static void ApplyDanielsStyle()
        {
            Formatter.DanielsStyle.Apply(
                Globals.ThisAddIn.Application.ActiveDocument,
                Globals.ThisAddIn.Application.Selection);
        }

        public static void FormatDrugs(int columns)
        {
            if (columns < 1 || columns > 2)
            {
                throw new ArgumentOutOfRangeException("Can only format 1 or 2 columns, not " + columns);
            }

            // If no "real" selection exists, attempt to auto-detect the drugs section.
            // (NB Technically, there is never _no_ selection in a document.)
            Word.Window activeWindow = Globals.ThisAddIn.Application.ActiveWindow;
            Word.Selection sel = activeWindow.Selection;
            Word.Paragraphs paragraphs = sel.Paragraphs;
            Word.Document document = activeWindow.Document;
            if (!(paragraphs.Count > 1
                || (sel.Text.Length > 1 && sel.Text.EndsWith("\r"))))
            {
                Logger.Info("FormatDrugs: Attempting to auto-detect");
                if (!Medication.Importer.AutoDetect(document))
                {
                    Logger.Info("FormatDrugs: Failed to auto-detect");
                    NotificationAction a = new NotificationAction();
                    a.Caption = "Formatieren nicht möglich";
                    a.Message = "Das Dokument scheint keine Medikationsliste zu enthalten.";
                    a.OkButtonText = "Schließen";
                    a.Invoke();
                    return;
                }
            }

            Logger.Info("FormatDrugs: Importing");
            Medication.Importer importer = new Medication.Importer(sel.Text);
            Medication.Formatter formatter = new Medication.Formatter(importer.Prescriptions);

            Logger.Info("FormatDrugs: Formatting");
            switch (columns)
            {
                case 1:
                    formatter.FormatOneColumn(document);
                    break;
                case 2:
                    formatter.FormatTwoColumns(document);
                    break;
                default:
                    break;
            }
            Logger.Info("FormatDrugs: Cleaning up");
            Bovender.ComHelpers.ReleaseComObject(document);
            Bovender.ComHelpers.ReleaseComObject(paragraphs);
            Bovender.ComHelpers.ReleaseComObject(sel);
            Bovender.ComHelpers.ReleaseComObject(activeWindow);
        }

        #endregion

        #region Private methods

        private static void DoFormat(Settings settings)
        {
            // If no "real" selection exists, attempt to auto-detect the lab data.
            // (NB Technically, there is never _no_ selection in a document.)
            Word.Application word = Globals.ThisAddIn.Application;
            Word.Document activeDocument = word.ActiveDocument;
            Word.Window activeWindow = word.ActiveWindow;
            Word.Selection selection = activeWindow.Selection;
            Word.Paragraphs paragraphs = selection.Paragraphs;
            if (!(paragraphs.Count > 1
                || (selection.Text.Length > 1 && selection.Text.EndsWith("\r"))))
            {
                Logger.Info("DoFormat: Attempting to auto-detect");
                Word.Document doc = activeWindow.Document;
                if (!AutoDetect.Detect(doc))
                {
                    Logger.Info("DoFormat: Automatic detection failed");
                    NotificationAction a = new NotificationAction();
                    a.Caption = "Formatieren nicht möglich";
                    a.Message = "Das Dokument scheint keine Lauris-Labordaten zu enthalten.";
                    a.OkButtonText = "Schließen";
                    a.Invoke();
                    return;
                }
                // Don't release the COM object here
                // Bovender.ComHelpers.ReleaseComObject(doc);
            }

            Logger.Info("DoFormat: Importing");
            ZaaImporter importer = new ZaaImporter();
            importer.Import(selection.Text);
            Formatter.Formatter formatter = new Formatter.Formatter(activeDocument);

            formatter.Settings = settings;
            formatter.Laboratory = importer.Laboratory;
            CommentPool.Default.Reset();
            CommentPool.Default.FillInComment += CommentPool_FillInComment;
            try
            {
                Logger.Info("DoFormat: Formatting");
                formatter.Run();
            }
            catch (NoLaboratoryDataException e)
            {
                Logger.Warn("DoFormat: No lab data?!");
                Logger.Warn(e);
                NotificationAction a = new NotificationAction();
                a.Caption = "Formatieren nicht möglich";
                a.Message = "Die aktuelle Markierung scheint keine Labordaten zu enthalten.";
                a.OkButtonText = "Schließen";
                a.Invoke();
            }
            Bovender.ComHelpers.ReleaseComObject(paragraphs);
            Bovender.ComHelpers.ReleaseComObject(selection);
            Bovender.ComHelpers.ReleaseComObject(activeWindow);
            Bovender.ComHelpers.ReleaseComObject(activeDocument);
            Logger.Info("DoFormat: Finished");
        }

        private static void CommentPool_FillInComment(object sender, ItemCommentEventArgs e)
        {
            if (UserSettings.Default.SuppressItemCommentInteraction)
            {
                Logger.Info("CommentPool_FillInComment: Comment interaction is suppressed by user settings");
                e.Comment.IsCancelled = true;
            }
            else
            {
                Logger.Info("CommentPool_FillInComment: Requesting user interaction");
                ItemCommentViewModel vm = new ItemCommentViewModel(e.Comment);
                vm.InjectInto<ItemCommentView>().ShowDialog();
            }
        }

        #endregion

        #region Class logger

        private static NLog.Logger Logger { get { return _logger.Value; } }

        private static readonly Lazy<NLog.Logger> _logger = new Lazy<NLog.Logger>(() => NLog.LogManager.GetCurrentClassLogger());

        #endregion
    }
}