package smile.xml;

import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyObject;
import org.jruby.RubyString;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyConstant;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

import smile.xml.util.UtilJ;

@JRubyClass( name="LibXML::XML::Encoding" )
public class EncodingJ extends RubyObject {
	
	private static final long serialVersionUID = -3033814105839661460L;
	
	private static final ObjectAllocator ALLOCATOR = new ObjectAllocator() {
		public IRubyObject allocate(Ruby runtime, RubyClass klass) {
			return new EncodingJ(runtime, klass);
		}
	};

	public static RubyClass define(Ruby runtime) {
		RubyClass c = UtilJ.defineClass( runtime, EncodingJ.class, ALLOCATOR );
		c.setConstant("UTF_8", runtime.newString("UTF-8") );
		c.setConstant("ISO_8859_1", runtime.newString("ISO-8859-1") );
		return c;
	}

	@JRubyConstant
	public static final String NONE = null;

//	@JRubyConstant
	public static final String UTF_8 = "UTF-8";
//	
//	@JRubyConstant
//	public static final String ISO_8859_1 = "ISO-8859-1";

	public static EncodingJ get(ThreadContext context, Object object ) {
		if( object == null )
			return null;
		if( object instanceof EncodingJ )
			return (EncodingJ) object;
		if( object instanceof String )
			return newInstance(context, (String) object );
		if( object instanceof RubyString )
			return newInstance(context, (RubyString) object );
		throw context.getRuntime().newArgumentError("");
	}

	public static EncodingJ newInstance(ThreadContext context, RubyString string) {
		IRubyObject[] args = { string };
		EncodingJ encoding = (EncodingJ) getRubyClass( context.getRuntime() ).newInstance(context, args, null );
		return encoding;
	}
	
	public static EncodingJ newInstance(ThreadContext context, String string) {
		return newInstance( context, context.getRuntime().newString(string) );
	}

	public static RubyClass getRubyClass(Ruby runtime) {
		return UtilJ.getClass(runtime, "LibXML", "XML", "Encoding");
	}

	private EncodingJ(Ruby runtime, RubyClass metaClass) {
		super(runtime, metaClass);
	}

	private RubyString encoding;

	@JRubyMethod(name = { "initialize" }, rest = true)
	public void initialize(ThreadContext context, IRubyObject[] args) {
		if (args.length > 0 && args[0] instanceof RubyString) {
			this.encoding = (RubyString) args[0];
			this.encoding = this.encoding.upcase(context);			
		}
	}
	
	@Override
	public String asJavaString() {
		return encoding == null ? "" : encoding.asJavaString();
	}
	
	public IRubyObject toConstant( ThreadContext context ) {
				
		return encoding;
	}


}