//
// This code is part of Document Solutions for Word demos.
// Copyright (c) MESCIUS inc. All rights reserved.
//
using System;
using System.IO;
using System.Drawing;
using System.Collections.Generic;
using System.Linq;
using System.Globalization;
using GrapeCity.Documents.Word;

namespace DsWordWeb.Demos
{
    // This example demonstrates the available text functions " +
    // that can be used with the 'calc' report templates feature " +
    // to perform various operations on strings." +
    // For example, to insert the concatenation of three text data fields, " +
    // the template '{{calc Concat(ds.a, ds.b, ds.c)}}' can be used. " +
    // The data source used in this demo contains a single record " +
    // with random string values. " +
    public class DataTplCalcText
    {
        public GcWordDocument CreateDocx()
        {
            const int MinLen = 5;
            var rnd = Util.NewRandom();
            int next()
            {
                return rnd.Next(1, 5);
            }

            string nextWord()
            {
                for (int i = 0; i < 50; ++i)
                {
                    var t = Util.LoremIpsumWord();
                    if (t.Length >= MinLen)
                        return t;
                }
                return "lorem";
            }

            // Generate a simple data source with pairs of random numeric data:
            var data = new[]
            {
                new { a = nextWord(), b = nextWord(), c = nextWord(), n = next(), },
            };

            var doc = new GcWordDocument();
            doc.Body.Sections.First.PageSetup.Margin.Top = 36;
            doc.Body.Sections.First.PageSetup.Margin.Bottom = 36;
            doc.Body.Sections.First.PageSetup.Margin.Left = 36;
            doc.Body.Sections.First.PageSetup.Margin.Right = 36;
            var paras = doc.Body.Paragraphs;

            // Add the data source:
            doc.DataTemplate.DataSources.Add("ds", data);

            // Styles and templates to show results:
            var bulletListTemplate = doc.ListTemplates.Add(BuiltInListTemplateId.BulletDefault, "bulletListTemplate");
            var exStyle = doc.Styles[BuiltInStyleId.Heading3];
            exStyle.ParagraphFormat.TabStops.Add(110);
            var resStyle = doc.Styles[BuiltInStyleId.Strong];

            add("Data", "{{ds.a}}");
            add("Data", "{{ds.b}}");
            add("Data", "{{ds.c}}");
            add("Data", "{{ds.n}}");

            add("Asc", "{{calc Asc(ds.a)}}");
            // TBD: format? add("Chr (ASCII code to char)", "Asc(49) = {{calc Asc(49)}}");
            add("Concat", "{{calc Concat(ds.a, ds.b, ds.c)}}");
            add("Contains", "{{calc Contains(ds.a, \"s\")}}");
            add("EndsWith", "{{calc EndsWith(ds.a, \"s\")}}");
            add("Insert", "{{calc Insert(ds.a, ds.n, ds.b)}}");
            add("InStr", "{{calc InStr(ds.a, \"s\")}}");
            add("InStr", "{{calc InStr(ds.a, \"s\", ds.n)}}");
            add("LCase", "{{calc LCase(\"Lorem Ipsum!\")}}");
            add("Len", "{{calc Len(ds.a)}}");
            add("LSet", "{{calc LSet(ds.a, 12)}}");
            add("LSet", "{{calc LSet(ds.a, 12, \"!\")}}");
            add("Mid", "{{calc Mid(ds.a, 2)}}");
            add("Mid", "{{calc Mid(ds.a, 2, 1)}}");
            add("Remove", "{{calc Remove(ds.a, 2)}}");
            add("Remove", "{{calc Remove(ds.a, 2, 1)}}");
            add("Replace", "{{calc Replace(\"loremipsumlobortis\", \"lorem\",\"ipsum\")}}");
            add("RSet", "{{calc RSet(ds.a, 12)}}");
            add("RSet", "{{calc RSet(ds.a, 12, \"!\")}}");
            add("StartsWith", "{{calc StartsWith(ds.a, \"s\")}}");
            add("StrReverse", "{{calc StrReverse(ds.a)}}");
            add("Trim", "{{calc Trim(\"  Lorem Ipsum  \")}}");
            add("UCase", "{{calc UCase(\"Lorem Ipsum!\")}}");

            // Process the templates:
            doc.DataTemplate.Process(CultureInfo.GetCultureInfo("en-US"));

            // Add a short note describing the demo at the top of the document:
            paras.Insert(
                "This example demonstrates the available text functions " +
                "that can be used with the 'calc' report templates feature " +
                "to perform various operations on strings." +
                "For example, to insert the concatenation of three text data fields, " +
                "the template '{{calc Concat(ds.a, ds.b, ds.c)}}' can be used. " +
                "The data source used in this demo contains a single record " +
                "with random string values. " +
                "Please see this sample source code for full details.",
                InsertLocation.Start);
            paras.Insert("Report templates: available calc operators", doc.Styles[BuiltInStyleId.Heading1], InsertLocation.Start);

            // Done:
            return doc;

            void add(string caption, string expr)
            {
                // \x200B is a zero-width space used to prevent template expansion:
                paras.Add(caption + "\t" + expr.Insert(1, "​​​\x200B") + " :  ", exStyle).ListFormat.Template = bulletListTemplate;
                paras.Last.GetRange().Runs.Add(expr, resStyle);
            }
        }
    }
}