using Microsoft.Office.Interop.Word;
/* Formatter.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;

namespace zaaReloaded2.Medication
{
    /// <summary>
    /// Formats prescriptions
    /// </summary>
    public class Formatter
    {
        #region Properties

        public IList<Prescription> Prescriptions { get; set; }

        #endregion

        #region Constructor

        public Formatter() { }

        public Formatter(IList<Prescription> prescriptions)
            : this()
        {
            Prescriptions = prescriptions;
        }

        #endregion

        #region Methods

        /// <summary>
        /// Writes a block of prescriptions with one column to a
        /// Word document.
        /// </summary>
        /// <param name="document"></param>
        public void FormatOneColumn(Document document)
        {
            DoFormat("Medikation einspaltig formatieren",
                document,
                writer =>
                {
                    foreach (Prescription p in Prescriptions)
                    {
                        writer.WriteLine(p.ToString());
                    }
                });
        }

        /// <summary>
        /// Writes a block of prescriptions with two columns to a
        /// Word document.
        /// </summary>
        /// <param name="document"></param>
        public void FormatTwoColumns(Document document)
        {
            DoFormat("Medikation zweispaltig formatieren",
                document,
                writer =>
                {
                    int half = Prescriptions.Count / 2 + Prescriptions.Count % 2;
                    for (int i = 0; i < half; i++)
                    {
                        writer.Write(Prescriptions[i].ToString());
                        if (i + half < Prescriptions.Count)
                        {
                            writer.Write("\t" + Prescriptions[i + half].ToString());
                        }
                        writer.WriteLine();
                    }
                });
        }

        /// <summary>
        /// Creates a table containing all prescriptions and copies it to
        /// the clipboard.
        /// </summary>
        public void CreatePrescriptionsTable()
        {
            throw new NotImplementedException();
        }
       
        #endregion

        #region Private methods

        void AddDisclaimer(zaaReloaded2.Formatter.DocumentWriter writer)
        {
            if (HasMMF())
            {
                writer.WriteLine();
                writer.WriteLine("<b>Hinweis: Während und nach Therapie mit Mycophenolsäurederivaten wie CellCept\u00ae " +
                    "und Myfortic\u00ae müssen Frauen und Männer eine Schwangerschaft sicher verhüten (siehe Rote-Hand-Brief zu " +
                    "CellCept\u00ae vom 10.11.2015).</b>");
                writer.WriteLine();
            }
            writer.WriteLine("<highlight><b>Bitte Medikation überprüfen!</b></highlight>");
        }

        /// <summary>
        /// Creates a paragraph and character styles in the document.
        /// </summary>
        void CreateStyles(Document document)
        {
            if (document != null)
            {
                Style style;
                // Don't see a better way to check for the existence of a particular
                // paragraph style than by using a try...catch construction.
                try
                {
                    style = document.Styles[Properties.Settings.Default.DrugsParagraph];
                }
                catch
                {
                    // Add default paragraph style for laboratory
                    style = document.Styles.Add(Properties.Settings.Default.DrugsParagraph);
                    style.Font.Size = 10; // pt
                    style.Font.Bold = 0;
                    style.Font.Italic = 0;
                    style.Font.Underline = 0;
                    style.ParagraphFormat.SpaceAfter = 0;
                    style.ParagraphFormat.SpaceBefore = 0;
                    style.ParagraphFormat.LeftIndent = 0; // pt
                    style.ParagraphFormat.FirstLineIndent = 0; // pt
                    style.ParagraphFormat.Alignment = WdParagraphAlignment.wdAlignParagraphLeft;
                    style.ParagraphFormat.TabStops.ClearAll();
                    int tabStop = 108; // 108 pt = 2.5 in = 3.8 cm
                    int halfWay = 227;  // 227 pt = 3.15 in = 8 cm
                    style.ParagraphFormat.TabStops.Add(tabStop);
                    style.ParagraphFormat.TabStops.Add(halfWay);
                    style.ParagraphFormat.TabStops.Add(halfWay + tabStop);
                }

                // try
                // {
                //     style = document.Styles[Properties.Settings.Default.DrugsHeader];
                // }
                // catch
                // {
                //     // Add header paragraph style for laboratory
                //     style = document.Styles.Add(Properties.Settings.Default.DrugsHeader);
                //     style.Font.Size = 10; // pt
                //     style.Font.Bold = 1;
                //     style.Font.Italic = 0;
                //     style.Font.Underline = WdUnderline.wdUnderlineSingle;
                //     style.ParagraphFormat.SpaceAfter = 0;
                //     style.ParagraphFormat.SpaceBefore = 12;
                //     style.ParagraphFormat.LeftIndent = 36; // pt
                //     style.ParagraphFormat.FirstLineIndent = -36; // pt
                //     style.ParagraphFormat.Alignment = WdParagraphAlignment.wdAlignParagraphJustify;
                //     style.set_NextParagraphStyle(document.Styles[Properties.Settings.Default.DrugsParagraph]);
                // }
            }
        }

        /// <summary>
        /// Does the heavy lifting in a DRY way.
        /// </summary>
        void DoFormat(string description, Document document,
            Action<zaaReloaded2.Formatter.DocumentWriter> outputAction)
        {
            if (document == null)
            {
                throw new ArgumentNullException(
                    "Cannot format prescriptions because no document was given.");
            }

            Helpers.StartUndo(description);
            zaaReloaded2.Formatter.DocumentWriter writer = new zaaReloaded2.Formatter.DocumentWriter(document);
            CreateStyles(document);
            writer.Write(String.Format("<style:{0}>", Properties.Settings.Default.DrugsParagraph));
            outputAction(writer);
            AddDisclaimer(writer);
            // writer.Write("</style>"); // causes COM exceptions, needs fix
            writer.Flush();
            Helpers.EndUndo();
        }

        /// <summary>
        /// Determines whether MMF or MPA is contained in the prescriptions.
        /// </summary>
        /// <returns>True if MMF or MPA is prescribed.</returns>
        bool HasMMF()
        {
            return Prescriptions.FirstOrDefault(p => p.IsMmf) != null;
        }

        #endregion
    }
}