using System;
using System.Drawing;
using Bytescout.PDFExtractor;

namespace InvoiceParsing
{
    /// <summary>
    /// This example demonstrates parsing and data extraction from typical invoice.
    /// </summary>
    class Program
    {
        static void Main(string[] args)
        {
            // Create TextExtractor instance
            TextExtractor textExtractor = new TextExtractor("demo", "demo");
            textExtractor.WordMatchingMode = WordMatchingMode.ExactMatch; // Set exact search (default is SmartSearch that works like in Adobe Reader)

            // Create XMLExtractor instance
            XMLExtractor xmlExtractor = new XMLExtractor("demo", "demo");

            // Load document
            textExtractor.LoadDocumentFromFile("Invoice.pdf");
            xmlExtractor.LoadDocumentFromFile("Invoice.pdf");

            // Results
            string invoiceNo = string.Empty;
            string invoiceDate = string.Empty;
            string total = string.Empty;
            string tableData = string.Empty;

            // Iterate pages
            for (int i = 0; i < textExtractor.GetPageCount(); i++)
            {
                RectangleF pageRectangle = textExtractor.GetPageRectangle(i);
                RectangleF tableRect = new RectangleF(0, 0, pageRectangle.Width, 0);

                // Search for "Invoice No."
                if (textExtractor.Find(i, "Invoice No.", false))
                {
                    // Get the found text rectangle
                    RectangleF textRect = textExtractor.FoundText.Bounds;
                    // Assume the text at right is the invoice number.
                    // Shift the rectangle to the right:
                    textRect.X = textRect.Right;
                    textRect.Width = pageRectangle.Right - textRect.Left;
                    // Set the extraction region and extract the text
                    textExtractor.SetExtractionArea(textRect);
                    invoiceNo = textExtractor.GetTextFromPage(i).Trim();
                }

                // Search for "Invoice Date" and extract text at right
                if (textExtractor.Find(i, "Invoice Date", false))
                {
                    RectangleF textRect = textExtractor.FoundText.Bounds;
                    textRect.X = textRect.Right;
                    textRect.Width = pageRectangle.Right - textRect.Left;
                    textExtractor.SetExtractionArea(textRect);
                    invoiceDate = textExtractor.GetTextFromPage(i).Trim();
                }

                // Search for "Quantity" keyword to detect the top of the tabular data rectangle
                if (textExtractor.Find(i, "Quantity", false))
                {
                    // Keep the top table coordinate
                    tableRect.Y = textExtractor.FoundText.Bounds.Top; // use textRect.Bottom if you want to skip column headers
                }

                // Search for "TOTAL" (it will be also the bottom of tabular data rectangle)
                if (textExtractor.Find(i, "TOTAL", true /* case sensitive! */)) 
                {
                    RectangleF textRect = textExtractor.FoundText.Bounds;
                    textRect.X = textRect.Right;
                    textRect.Width = pageRectangle.Right - textRect.Left;
                    textExtractor.SetExtractionArea(textRect);
                    total = textExtractor.GetTextFromPage(i).Trim();

                    // Calculate the table height
                    tableRect.Height = textRect.Top - tableRect.Top;
                }

                // Extract tabular data using XMLExtractor
                if (tableRect.Height > 0)
                {
                    xmlExtractor.SetExtractionArea(tableRect);
                    tableData = xmlExtractor.GetXMLFromPage(i);
                }
            }

            // Display extracted data
            Console.WriteLine("Invoice No.: " + invoiceNo);
            Console.WriteLine("Invoice Date: " + invoiceDate);
            Console.WriteLine("TOTAL: " + total);
            Console.WriteLine("Table Data: ");
            Console.WriteLine(tableData);

            // Cleanup
            textExtractor.Dispose();
            xmlExtractor.Dispose();            

            Console.WriteLine();
            Console.WriteLine("Press any key...");
            Console.ReadKey();
        }
    }
}