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package net.anthavio.httl.util;

import java.io.Serializable;
import java.lang.reflect.Array;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;

import javax.xml.bind.DatatypeConverter;

/**
 * Jackson (JSON weapon of choice) is missing simple JSON strings builder.
 * Other libraries are just too heavy for this quite simple job.
 * 
 * By default, builder use ISO8601 date format and does NOT perform formatting and indentation
 * 
 * Funny stuff with generics included!
 * 
 * @author martin.vanek
 *
 */
public class JsonBuilder {

	private boolean indenting;

	private int level = 0;

	private StringBuilder sb = new StringBuilder();

	private SimpleDateFormat dateFormat;

	/**
	 * Start JSON object { ...
	 * 

	 * Shorthand to new JsonBuilder().object()
	 */
	public static ObjectBuilder OBJECT() {
		return new JsonBuilder().object();
	}

	/**
	 * Start JSON array { ...
	 * 

	 * Shorthand to new JsonBuilder().array()
	 */
	public static ArrayBuilder ARRAY() {
		return new JsonBuilder().array();
	}

	public JsonBuilder(boolean indenting, String dateFormat) {
		this.indenting = indenting;
		if (dateFormat != null) {
			this.dateFormat = new SimpleDateFormat(dateFormat);
		}
	}

	public JsonBuilder(boolean indenting) {
		this(indenting, null);
	}

	public JsonBuilder(String dateFormat) {
		this(false, dateFormat);
		if (dateFormat == null) {
			throw new IllegalArgumentException("DateFormat pattern is null");
		}
	}

	public JsonBuilder() {
		this(false, null);
	}

	public boolean isIndenting() {
		return indenting;
	}

	public void setIndenting(boolean indenting) {
		this.indenting = indenting;
	}

	public void setDateFormat(String pattern) {
		this.dateFormat = new SimpleDateFormat(pattern);
	}

	/**
	 * Start Root JSON object
	 */
	public ObjectBuilder object() {
		return new ObjectBuilder(this);
	}

	/**
	 * Shorthand to start JSON object with field as simple value
	 */
	public ObjectBuilder object(String fieldName, Object fieldValue) {
		return new ObjectBuilder(this).field(fieldName, fieldValue);
	}

	/**
	 * Shorthand to start JSON object with field as nested object
	 */
	public ObjectBuilder> object(String fieldName) {
		return new ObjectBuilder(this).object(fieldName);
	}

	/**
	 * Start Root JSON array
	 */
	public ArrayBuilder array() {
		return new ArrayBuilder(this);
	}

	/**
	 * Shorthand to create simple JSON array out of collection
	 */
	public JsonBuilder array(Collection