using System;
using System.Xml;
using System.Xml.Linq;
using System.IO;
					
public class Program
{
	public static void Main()
	{
		XmlWriterSettings writerSettings = new() {
			// enable newlines on attributes
			NewLineOnAttributes = true,
			
			// value of NewLineHandling doesn't chnage behavior
			//NewLineHandling = NewLineHandling.None,
			//NewLineHandling = NewLineHandling.Entitize,
			NewLineHandling = NewLineHandling.Replace,
			
			// value of NewLineChars doesn't change behavior
			NewLineChars = "\n",
			
			// if Indent is false, no newlines will be written at all,
			// regardless of NewLineHandling; which seems improper 🤷🏻‍♀️
			Indent = true,
		};
		
		string[] tests = new[] {
			// this test will properly writes each attribute on their own lines
			"""<?xml version="1.0" encoding="utf-8"?><data attrib1="1" attrib2="2" attrib3="3" attrib4="4"><child /></data>""",
			// xmlns is written next to the element name, but other attributes are correctly written on their own line
			"""<?xml version="1.0" encoding="utf-8"?><data xmlns="1" attrib2="2" attrib3="3" attrib4="4"><child /></data>""",
			// no newline after attrib3, xmlns is written on the same line
			"""<?xml version="1.0" encoding="utf-8"?><data attrib1="1" attrib2="2" attrib3="3" xmlns="4"><child /></data>""",
			// no newline after attrib2, xmlns is written on the same line, but attrib4 is correctly written on it's own line
			"""<?xml version="1.0" encoding="utf-8"?><data attrib1="1" attrib2="2" xmlns="3" attrib4="4"><child /></data>""",
			// the same as above, just on an empty element
			"""<?xml version="1.0" encoding="utf-8"?><data attrib1="1" attrib2="2" xmlns="3" attrib4="4" />""",
		};
		
		foreach (string test in tests)
		{
			FormatAndPrint(test, writerSettings);
		}
	}
	
	public static void FormatAndPrint(string s, XmlWriterSettings writerSettings)
	{
		// load the xml string, and write it to memory
		XDocument xd = XDocument.Parse(s);
		using MemoryStream stream = new();
		using XmlWriter writer = XmlWriter.Create(stream, writerSettings);
		xd.WriteTo(writer);
		writer.Flush();

		// read the written xml back out out of memory, and write it to console
		stream.Position = 0;
		using StreamReader reader = new StreamReader(stream, writerSettings.Encoding);
		string xml = reader.ReadToEnd();
		Console.WriteLine("---");
		Console.WriteLine(xml);
		Console.WriteLine();
	}
}