package foundation.io.object;

import java.util.Iterator;

import foundation.json.IJSONProvider;
import foundation.json.IJSONWriter;
import foundation.util.ContentBuilder;
import foundation.util.MapList;
import foundation.util.Util;

public class Headers implements Iterable<Header>, IJSONProvider {

	private MapList<String, Header> items;
	
	public Headers() {
		items = new MapList<String, Header>();
	}

	public void addOne(int index, String title, String value) {
		if (Util.isEmpty(title) && Util.isEmpty(value)) {
			return;
		}
		
		Header header = new Header(index, title, value);
		items.add(title, header); 
	}

	public void addOne(String title) {
		int index = items.size();
		Header header = new Header(index, title, null);
		items.add(title, header); 
	}
	
	public boolean contains(String title) {
		return items.contains(title);
	}

	public Titles getTitles() {
		Titles result = new Titles();
		
		for (Header header: items) {
			result.add(header.getTitle());
		}
		
		return result;
	}
	
	public int size() {
		return items.size();
	}

	public boolean isEmpty() {
		return items.isEmpty();
	}
	
	public void clear() {
		items.clear();
	}

	@Override
	public Iterator<Header> iterator() {
		return items.iterator();
	}
	
	@Override
	public String toString() {
		ContentBuilder builder = new ContentBuilder(", ");
		
		for (Header header: items) {
			builder.append(header.getTitle() + "(" + header.getFieldName() + ")");
		}
		
		return builder.toString();
	}

	@Override
	public void writeJSON(IJSONWriter writer) {
		writer.beginArray();
		
		for (Header header: items) {
			writer.beginObject();
			
			writer.write("title", header.getTitle());
			writer.write("field", header.getFieldName());
			
			writer.endObject();
		}
		
		writer.endArray();
	}

}