using System;
using System.Collections.Generic;
using System.Xml;

namespace UsingXML
{
    // We establish a generic Person Class, and define necessary methods
    class PersonObject
    {
        public string fname { get; set; }
        public string lname { get; set; }
        public int age { get; set; }
        public char gender { get; set; }

        public PersonObject(string f, string l, int a, char g)
        {
            this.fname = f;
            this.lname = l;
            this.age = a;
            this.gender = g;
        }
    }

    class ReadAndLoad
    {
        static void Main(string[] args)
        {
            // Prompt the user for file path, provide the current local
            // directory if the user wants to use a relative path.
            Console.Write("Current Local Path: ");
            Console.WriteLine(Environment.CurrentDirectory);
            Console.Write("Path to file? > ");
            string UserPath = Console.ReadLine();

            // Declare a new XML Document
            XmlDocument XmlDoc = new XmlDocument();

            // Try to open the XML file
            try
            {
                Console.WriteLine("\nNow Loading: {0}\n", UserPath);
                XmlDoc.Load(UserPath);
            }
            // Catch "File Not Found" errors
            catch (System.IO.FileNotFoundException)
            {
                Console.WriteLine("No file found!");
                Environment.Exit(1);
            }
            // Catch Argument Exceptions
            catch (System.ArgumentException)
            {
                Console.WriteLine("Invalid path detected!");
                Environment.Exit(1);
            }
            // Catach all other errors, and print them to console.
            catch (Exception err)
            {
                Console.WriteLine("An Exception has been caught:");
                Console.WriteLine(err);
                Environment.Exit(1);
            }

            // Declare the xpath for finding objects inside the XML file
            XmlNodeList XmlDocNodes = XmlDoc.SelectNodes("/People/Person");

            // Define a new List, to store the objects we pull out of the XML
            List<PersonObject> PersonList = new List<PersonObject>();

            // Loop through the nodes, extracting Person information.
            // We can then define a person object and add it to the list.
            foreach (XmlNode node in XmlDocNodes)
            {
                int TempAge = int.Parse(node["Age"].InnerText);
                char TempGender = node["Gender"].InnerText[0];

                PersonObject obj = new PersonObject(node["FirstName"].InnerText,
                                                    node["LastName"].InnerText,
                                                    TempAge,
                                                    TempGender);
                PersonList.Add(obj);
            }

            // How many PersonObjects did we find in the XML?
            int ListSize = PersonList.Count;

            // Handle statements for 0, 1, or many PersonObjects
            if (ListSize == 0)
            {
                Console.WriteLine("File contains no PersonObjects.\n");
                Environment.Exit(0);
            }
            else if (ListSize == 1)
                Console.WriteLine("Contains 1 PersonObject:\n");
            else
                Console.WriteLine("Contains {0} PersonObjects:\n", ListSize);

            // Loop through the list, and print all the PersonObjects to screen
            for (int i = 0; i < ListSize; i++)
            {
                Console.WriteLine(" PersonObject {0}", i);
                Console.WriteLine("------------------------------------------");
                Console.WriteLine(" First Name : {0}", PersonList[i].fname);
                Console.WriteLine(" Last Name  : {0}", PersonList[i].lname);
                Console.WriteLine(" Age ...... : {0}", PersonList[i].age);
                Console.WriteLine(" Gender ... : {0}", PersonList[i].gender);
                Console.Write("\n");
            }

            // ...and we are done!
            Environment.Exit(0);
        }
    }
}