package com.justep.ops.processor;

import java.io.File;
import java.io.IOException;

import org.orbeon.oxf.common.OXFException;
import org.orbeon.oxf.pipeline.api.ExternalContext;
import org.orbeon.oxf.pipeline.api.PipelineContext;
import org.orbeon.oxf.processor.ProcessorInputOutputInfo;
import org.orbeon.oxf.processor.SimpleProcessor;
import org.orbeon.oxf.resources.ResourceManager;
import org.orbeon.oxf.resources.ResourceManagerWrapper;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;


public class GeneratorPageFlowProcessor extends SimpleProcessor {

	public GeneratorPageFlowProcessor(){
		addOutputInfo(new ProcessorInputOutputInfo(OUTPUT_DATA));
	}

    public void generateData(PipelineContext context,
			ContentHandler contentHandler) throws SAXException, IOException {
    	final ExternalContext.Request request = getRequest(context);
    	String path = getPageFlowPath(request.getRequestPath());

    	ResourceManager rm = ResourceManagerWrapper.instance();
    	rm.getContentAsSAX(path, contentHandler);
	}
    
    private String getPageFlowPath(String requestPath){
    	if (!requestPath.endsWith("/"))
    		requestPath += "/";
    	
    	while (requestPath != null){
    		String path = "/apps" + requestPath + "page-flow.xml";
    		if (isExists(path)){
    			return path;	
    		}else{
    			requestPath = getNextRequestPath(requestPath);
    		}
    	}
    	
    	throw new RuntimeException(requestPath + " don't match page-flow.xml!");
    }
    
    private boolean isExists(String path){
		String realPath = ResourceManagerWrapper.instance().getRealPath(path);
		File file = new File(realPath);
		return file.exists();
    }
    
    private String getNextRequestPath(String requestPath){
		requestPath = requestPath.substring(0, requestPath.length()-1);
		int index = requestPath.lastIndexOf("/");
		if ((index != -1) && (index != 0)){
			return requestPath.substring(0, index + 1);	
		}else{
			return null;
		}
    }
    
    private ExternalContext.Request getRequest(PipelineContext context) {
        ExternalContext externalContext = (ExternalContext) context.getAttribute(PipelineContext.EXTERNAL_CONTEXT);
        if (externalContext == null)
            throw new OXFException("Missing external context");
        return externalContext.getRequest();
    }
}