//
// 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 sample demonstrates the use of BatchStepProcessor class,
    // which allows you to execute a single step of batch processing,
    // processing a single specified record of the data source.
    //
    // See also the DataTplBatchOceans sample, which uses the same data source
    // but processes all data items in a batch.
    public class DataTplBatchStep
    {
        public GcWordDocument CreateDocx()
        {
            // The data source (ocean and sea data from Wikipedia):
            var oceans = new[]
            {
                new { name = "Pacific", areaOfWorldOcean = 0.466, volumeOfWorldOcean = 0.501, seas = new[]
                    { new {name = "Australasian Mediterranean Sea" }, new { name = "Philippine Sea" }, new { name = "Coral Sea" }, new { name = "South China Sea"}  }
                },
                new { name = "Atlantic", areaOfWorldOcean = 0.235, volumeOfWorldOcean = 0.233, seas = new[]
                    { new {name = "Sargasso Sea" }, new { name = "Caribbean Sea" }, new { name = "Mediterranean Sea" }, new { name = "Gulf of Guinea" } }
                },
                new { name = "Indian", areaOfWorldOcean = 0.195, volumeOfWorldOcean = 0.198, seas = new[]
                    { new {name = "Arabian Sea" }, new { name = "Bay of Bengal" }, new { name = "Andaman Sea" }, new { name = "Laccadive Sea" } }
                },
                new { name = "Southern", areaOfWorldOcean = 0.061, volumeOfWorldOcean = 0.054, seas = new[]
                    { new {name = "Weddell Sea" }, new { name = "Somov Sea" }, new { name = "Riiser-Larsen Sea" }, new { name = "Lazarev Sea" } }
                },
                new { name = "Arctic", areaOfWorldOcean = 0.043, volumeOfWorldOcean = 0.014, seas = new[]
                    { new {name = "Barents Sea" }, new { name = "Greenland Sea" }, new { name = "East Siberian Sea" }, new { name = "Kara Sea" } }
                },
            };

            // Create and load the template DOCX:
            var doc = new GcWordDocument();
            doc.Load(Path.Combine("Resources", "WordDocs", "BatchOceansTemplate.docx"));

            // Add the data source to the data template data sources
            doc.DataTemplate.DataSources.Add("ds", oceans);

            // Initialize the batch step processor:
            var batchProcessor = doc.DataTemplate.InitBatchStepProcessor(CultureInfo.GetCultureInfo("en-US"));

            // Get a random record index to process:
            var recordIndex = Random.Shared.Next(0, batchProcessor.MaxRecordIndex);

            // Process the specific record index only.
            // Note that we must save the document using the action passed to ProcessRecord(),
            // as the original document reverts to its initial state after processing:
            var ms = new MemoryStream();
            batchProcessor.ProcessRecord(recordIndex, () => doc.Save(ms));

            // Load the processed document from the memory stream and return it:
            ms.Position = 0;
            doc.Load(ms);
            doc.Body.Paragraphs.Insert($"Note: This document was generated by processing record index {recordIndex} only.",
                doc.Styles[BuiltInStyleId.BlockText], InsertLocation.Start);

            return doc;
        }
    }
}