package com.loomis.jsf.component;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.servlet.http.HttpServletResponse;

/**
 * 
 * @author AGORI and Octoberdan
 */
public class ResourcePhaseListener implements PhaseListener {
	public static final String RESOURCE_KEY = "ResourceNames_" + new Date().getTime();
	
	private Map<String, String> resourceMap;

	private String getResource(String resourceName) {
		
		if (getResourceMap().containsKey(resourceName)) {
			return getResourceMap().get(resourceName);
		}
		
		StringBuffer resourceBuf = new StringBuffer();
		BufferedReader br = new BufferedReader(new InputStreamReader(getClass()
				.getResourceAsStream(resourceName)));
		
		try {
			String line = "";
			
			while ((line = br.readLine()) != null) {
				resourceBuf.append(line + "\n");
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (br != null) {
				try {
					br.close();
				} catch (IOException ex) {

				}
			}
		}
		
		String resource = resourceBuf.toString();
		
		if (resource != "") {
			getResourceMap().put(resourceName, resource);
		}
		
		return resource;
	}

	public static List<String> getResourceNames(ExternalContext exContext) {
		Object obj = exContext.getRequestMap().get(RESOURCE_KEY);
		
		return obj instanceof List ? (List)obj : null;
	}
	
	public void afterPhase(PhaseEvent event) {
		
		if (!event.getPhaseId().equals(PhaseId.RENDER_RESPONSE)) {
			return;
		}
		
		FacesContext context = event.getFacesContext();
		ExternalContext exContext = context.getExternalContext();
		PrintWriter out = null;
		HttpServletResponse response = (HttpServletResponse) exContext
				.getResponse();

		List<String> resourceNames = getResourceNames(exContext);
		
		if (resourceNames == null) {
			return;
		}
		
		for (String resourceName : getResourceNames(exContext)) {
			try {
				String resource = getResource((String) resourceName);

				response.setContentType("text/plain;charset=UTF-8");
				out = response.getWriter();
				out.print(resource);
			} catch (Exception e) {

			} finally {
				if (out != null) {
					out.close();
				}
				context.responseComplete();
			}
		}
	}

	public PhaseId getPhaseId() {
		return PhaseId.RESTORE_VIEW;
	}
	
	public void beforePhase(PhaseEvent event) {
	}

	public Map<String, String> getResourceMap() {
		if (resourceMap == null) resourceMap = new HashMap<String, String>();
		
		return resourceMap;
	}

	public void setResourceMap(Map<String, String> resourceMap) {
		this.resourceMap = resourceMap;
	}
}