using System;
using System.Collections.Generic;
using System.Text;
using Word = Microsoft.Office.Interop.Word;
using System.IO;

namespace WordTest
{
    class Program
    {
        public static void Main(string[] args)
        {
            object oMissing = System.Reflection.Missing.Value;

            // Start Word and create a new document.
            Word.Application oWord;
            Word.Document oDocOriginal; // the template
            Word.Document oDocNew; // the output

            object oEndOfDoc = @"\endofdoc";  // predefined bookmark of document end
            oWord = null;
            try
            {
                oWord = new Word.Application();
                oWord.Visible = false;
                // We are reading th template
                object oFileName = Path.GetFullPath(@"..\..\Dyplom.doc");
                oDocOriginal = oWord.Documents.Add(ref oFileName, ref oMissing, ref oMissing, ref oMissing);

                // We are creating the output document
                oDocNew = oWord.Documents.Add(ref oMissing, ref oMissing, ref oMissing, ref oMissing);

                string[] students = new string[] { "Jan Kowalski", "Paweł Nowak", "Anna Nowakowska" };

                // for each student
                for (int i = 0; i < students.Length; i++)
                {
                    // We're copying data from the template document
                    oDocNew.Bookmarks.get_Item(ref oEndOfDoc).Range.FormattedText = oDocOriginal.Content.FormattedText;

                    // And changing the tag
                    foreach (Word.Range tmpRange in oDocNew.StoryRanges)
                    {
                        tmpRange.Find.Text = "%UCZEN%";
                        tmpRange.Find.Replacement.Text = students[i];
                        tmpRange.Find.Wrap = Word.WdFindWrap.wdFindContinue;
                        object replaceAll = Word.WdReplace.wdReplaceAll;
                        tmpRange.Find.Execute(ref oMissing, ref oMissing, ref oMissing,
                            ref oMissing, ref oMissing, ref oMissing, ref oMissing,
                            ref oMissing, ref oMissing, ref oMissing, ref replaceAll,
                            ref oMissing, ref oMissing, ref oMissing, ref oMissing);
                    }
                    // And adding a page break at the end if it's not the last student
                    if (i < students.Length - 1)
                    {
                        object oPageBreak = Word.WdBreakType.wdPageBreak;
                        oDocNew.Bookmarks.get_Item(ref oEndOfDoc).Range.InsertBreak(ref oPageBreak);
                    }
                }

                // we save the resulting document
                object FileName = Path.GetFullPath(@"..\..\Wynik.doc");
                oDocNew.SaveAs(ref FileName, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
                    ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
                    ref oMissing, ref oMissing, ref oMissing, ref oMissing);
            }
            finally
            {
                if (oWord != null)
                {
                    // Close Word
                    object doNotSaveChanges = Word.WdSaveOptions.wdDoNotSaveChanges;
                    oWord.Quit(ref doNotSaveChanges, ref oMissing, ref oMissing);
                }
            }
        }
    }
}