/*
    GNU GENERAL LICENSE
    Copyright (C) 2006 The Lobo Project. Copyright (C) 2014 - 2017 Lobo Evolution

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public
    License as published by the Free Software Foundation; either
    verion 3 of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General License for more details.

    You should have received a copy of the GNU General Public
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    

    Contact info: lobochief@users.sourceforge.net; ivan.difrancesco@yahoo.it
 */
package org.lobobrowser.html.js;

import org.lobobrowser.html.HtmlRendererContext;
import org.lobobrowser.js.AbstractScriptableDelegate;

/**
 * The Class History.
 */
public class History extends AbstractScriptableDelegate {

	/** The window. */
	private final Window window;

	/**
	 * Instantiates a new history.
	 *
	 * @param window
	 *            the window
	 */
	History(Window window) {
		this.window = window;
	}

	/**
	 * Gets the current.
	 *
	 * @return the current
	 */
	public String getCurrent() {
		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		return ctx != null ? ctx.getCurrentURL() : null;
	}

	/**
	 * Gets the next.
	 *
	 * @return the next
	 */
	public String getNext() {
		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		return ctx != null ? ctx.getNextURL() : null;
	}

	/**
	 * Gets the previous.
	 *
	 * @return the previous
	 */
	public String getPrevious() {
		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		return ctx != null ? ctx.getPreviousURL() : null;
	}

	/**
	 * Gets the length.
	 *
	 * @return the length
	 */
	public int getLength() {
		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		return ctx != null ? ctx.getHistoryLength() : 0;
	}

	/**
	 * Back.
	 */
	public void back() {
		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		if (ctx != null) {
			ctx.back();
		}
	}

	/**
	 * Forward.
	 */
	public void forward() {
		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		if (ctx != null) {
			ctx.forward();
		}
	}

	/**
	 * Go.
	 *
	 * @param offset
	 *            the offset
	 */
	public void go(int offset) {
		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		if (ctx != null) {
			ctx.moveInHistory(offset);
		}
	}

	/**
	 * Go.
	 *
	 * @param url
	 *            the url
	 */
	public void go(String url) {
		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		if (ctx != null) {
			ctx.goToHistoryURL(url);
		}
	}

	/**
	 * Gets the state.
	 *
	 * @return the state
	 */
	public Object getState() {
		return window.getStatus();

	}

	/**
	 * Push state.
	 *
	 * @param data
	 *            the data
	 * @param title
	 *            the title
	 * @param url
	 *            the url
	 */
	public void pushState(Object data, String title, String url) {
		// TODO
	}

	/**
	 * Replace state.
	 *
	 * @param data
	 *            the data
	 * @param title
	 *            the title
	 * @param url
	 *            the url
	 */
	public void replaceState(Object data, String title, String url) {
		// TODO
	}
}