import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import net.sf.sahi.client.Browser;
import net.sf.sahi.client.ElementStub;

public class JQuery {
	protected Browser browser;
	
	public JQuery(Browser browser){
		this.browser = browser;
	}
	
	private String[] getMatches(String text, String regex){
		List<String> allMatches = new ArrayList<String>();
		Matcher m = Pattern.compile(regex)
		    .matcher(text);
		while (m.find()) {
		  allMatches.add(m.group());
		}
		allMatches.add(0, " ");
		return allMatches.toArray(new String[allMatches.size()]);
	}

	
	public ElementStub get(String dsl){
		return get(dsl, false);
	}
	
	public ElementStub get(String dsl, Boolean forceXPath){
		dsl = dsl.replaceAll("\\s+(?=[^\\{\\}]*\\})", "-^v^v^-"); //Using a delimiter for space inside curly braces - "{Products Tab}"
		String delimiterRegex = "\\s+>?\\s+|\\s+"; // the selector is split based on " " and " > " 
		if(dsl.matches("\\s+>\\s+|\\s+")) // Return XPath if " > " is present
			forceXPath = true;
		String keys[] = dsl.split(delimiterRegex);
		String delimiters[] = this.getMatches(dsl, delimiterRegex);
		for(int i = 0; i < keys.length; i++)
			keys[i] = keys[i].replace("-^v^v^-", " ");
		Boolean xPathFlag = forceXPath;
		String xPath = "";
		ElementStub el = null;
		for(int i = 0; i < keys.length; i++){
			if(!xPathFlag){
				ElementStub ret = this.getSingleElement(keys[i].trim());
				if(ret == null)
					xPathFlag = true;
				else if(el == null)
					el = ret;
				else
					el = ret.in(el);
			}
			xPath += addXPath(keys[i].trim(), delimiters[i].trim());
		}
		if(xPathFlag || el == null)
			return this.browser.byXPath(xPath);
		return el;
	}

	private String addXPath(String selector, String delimiter) {
		int hash = selector.indexOf('#');
		int dot = selector.indexOf('.');
		int textOpen = selector.indexOf('{');
		String path = "";
		String text = "";
		delimiter = delimiter.equals(">") ? "/" : "//";
		int index = -1;
		if (selector.contains("[") && selector.contains("]")){
			// Removing the text from string before checking for '.' and '#'
			index = Integer.parseInt(selector.substring(selector.indexOf('[') + 1, selector.indexOf(']')));
			selector = selector.substring(0, selector.indexOf('['));
		}
		if (selector.contains("{") && selector.contains("}")){
			// Removing the text from string before checking for '.' and '#'
			text = selector.substring(textOpen + 1, selector.indexOf('}'));
			selector = selector.substring(0, textOpen);
		}
		if(selector.contains("#")){
			// By Id
			String id = "";
			if(dot != -1)
				id = selector.substring(hash + 1, dot);
			else
				id = selector.substring(hash + 1);
			path = delimiter + "*[@id='" + id + "']";
		} else if(selector.contains(".")){
			// By Class Name
			int lastDot = selector.lastIndexOf('.');
			String tagName = "*";
			if(dot != 0)
				tagName = selector.substring(0, dot);
			path = delimiter + tagName;
			String[] classNames = selector.split("\\.");
			for(int i = 1; i < classNames.length; i++)
				path += "[contains(@class, '" + classNames[i] + "')]";
		} else if (text.length() > 0){
			// By text - Syntax: "{some text}"
			String tagName = "*";
			if(textOpen != 0)
				tagName = selector;
			path = delimiter + tagName + "[text()[contains(.,'" + text + "')]]";
		} else {
			//Default - tagname
			path = delimiter + selector;
		}
		if(index > -1)
			path = path + "[" + index + "]";
		return path;
	}


	private ElementStub getSingleElement(String selector) {
		int hash = selector.indexOf('#');
		int dot = selector.indexOf('.');
		int textOpen = selector.indexOf('{');
		String text = "";
		int index = -1;
		if (selector.contains("[") && selector.contains("]")){
			// Removing the text from string before checking for '.' and '#'
			index = Integer.parseInt(selector.substring(selector.indexOf('[') + 1, selector.indexOf(']')));
			selector = selector.substring(0, selector.indexOf('['));
		}
		if (selector.contains("{") && selector.contains("}")){
			// Removing the text from string before checking for '.' and '#'
			text = selector.substring(textOpen + 1, selector.indexOf('}'));
			selector = selector.substring(0, textOpen);
		}
		if(selector.contains("#")){
			// By Id
			String id = "";
			if(dot != -1)
				id = selector.substring(hash + 1, dot);
			else
				id = selector.substring(hash + 1);
			return this.browser.byId(id);
		} else if(selector.contains(".")){
			// By Class Name
			// Need to improvise for multiple classes
			int lastDot = selector.lastIndexOf('.');
			String className = "";
			if (lastDot != dot && lastDot != -1)
				className = selector.substring(dot + 1, lastDot);
			else
				className = selector.substring(dot + 1);
			if(dot != 0){
				String tagName = selector.substring(0, dot);
				return this.browser.byClassName("/" + className + "/", tagName);
			}
			return null;
		} else if (text.length() > 0){
			// By text - Syntax: "{some text}"
			String tagName = selector;
			if(textOpen != 0)
				return this.browser.byText(text, tagName);
			return null;
		} 
		// Tag names
		else if(index > -1){
			if(selector.equalsIgnoreCase("button"))
				return this.browser.button(index);
			else if(selector.equalsIgnoreCase("checkbox"))
				return this.browser.checkbox(index);
			else if(selector.equalsIgnoreCase("div"))
				return this.browser.div(index);
			else if(selector.equalsIgnoreCase("h1"))
				return this.browser.heading1(index);
			else if(selector.equalsIgnoreCase("h2"))
				return this.browser.heading2(index);
			else if(selector.equalsIgnoreCase("h3"))
				return this.browser.heading3(index);
			else if(selector.equalsIgnoreCase("h4"))
				return this.browser.heading4(index);
			else if(selector.equalsIgnoreCase("h5"))
				return this.browser.heading5(index);
			else if(selector.equalsIgnoreCase("h6"))
				return this.browser.heading6(index);
			else if(selector.equalsIgnoreCase("img"))
				return this.browser.image(index);
			else if(selector.equalsIgnoreCase("a"))
				return this.browser.link(index);
			else if(selector.equalsIgnoreCase("li"))
				return this.browser.listItem(index);
			else if(selector.equalsIgnoreCase("ul") || selector.equalsIgnoreCase("ol"))
				return this.browser.list(index);
			else if(selector.equalsIgnoreCase("option"))
				return this.browser.option(index);
			else if(selector.equalsIgnoreCase("p"))
				return this.browser.paragraph(index);
			else if(selector.equalsIgnoreCase("password"))
				return this.browser.password(index);
			else if(selector.equalsIgnoreCase("radio"))
				return this.browser.radio(index);
			else if(selector.equalsIgnoreCase("table"))
				return this.browser.table(index);
			else if(selector.equalsIgnoreCase("select"))
				return this.browser.select(index);
			else if(selector.equalsIgnoreCase("span"))
				return this.browser.span(index);
			else if(selector.equalsIgnoreCase("submit"))
				return this.browser.submit(index);
			else if(selector.equalsIgnoreCase("textbox"))
				return this.browser.textbox(index);
			return browser.div(selector + "[" + index + "]");
		}
		return null;
	}

}