// <copyright file="PDFSplitter.cs" company="Smart Energia">
// Copyright (c) Smart Energia. All rights reserved.
// </copyright>

namespace Faturas
{
    using iText.Kernel.Pdf;
    using iText.Kernel.Utils;

    /// <summary>
    /// Class for splitting PDF documents.
    /// </summary>
    public class PDFSplitter
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="PDFSplitter"/> class.
        /// </summary>
        /// <param name="pagina">The 1-based page number to extract; if null, the whole document is used.</param>
        /// <param name="origem">Full path to the source PDF file to read.</param>
        /// <param name="destino">Full path to the destination PDF file to create containing the extracted pages.</param>
        public PDFSplitter(int? pagina, string origem, string destino)
        {
            FileStream document = new (origem, FileMode.Open, FileAccess.Read, FileShare.Read);
            PdfDocument pdfDocument = new (new PdfReader(document));
            var split = new CustomPdfSplitter(pdfDocument, pageRange => new PdfWriter(destino));
            PdfDocument result = split.ExtractPageRange(new PageRange(pagina.ToString()));
            document.Close();
            result.Close();
        }
    }
}