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package org.etlunit.util;

import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.etlunit.context.VariableContext;

import java.io.File;
import java.io.StringWriter;
import java.util.Map;

public class VelocityUtil
{
	static VelocityEngine getVelocityEngine()
	{
		return getVelocityEngine(new File("."));
	}

	static VelocityEngine getVelocityEngine(File templateRoot)
	{
		VelocityEngine velocityEngine = new VelocityEngine();

		velocityEngine.addProperty("file.resource.loader.path", templateRoot.getAbsolutePath());
		velocityEngine.init();

		return velocityEngine;
	}

	public static void writeTestReport(File testReport, TestSuite suite) throws Exception
	{
		VelocityContext vcontext = new VelocityContext();

		vcontext.put("testSuite", suite);

		writeTemplate(new File("..\\conf\\TEST-report.vm"), testReport, suite);
	}

	public static void writeTemplate(File template, File output, Object bean) throws Exception
	{
		VelocityContext vcontext = new VelocityContext();

		vcontext.put("bean", bean);

		IOUtils.writeBufferToFile(output, new StringBuffer(writeTemplate(template, bean)));
	}

	public static String writeTemplate(File template, Object bean) throws Exception
	{
		VelocityContext vcontext = new VelocityContext();

		vcontext.put("bean", bean);

		/* lets render a template */
		String st = IOUtils.readFileToString(template);

		return writeTemplate(st, bean);
	}

	public static String writeTemplate(String template, Object bean) throws Exception
	{
		VelocityContext vcontext = new VelocityContext();

		vcontext.put("bean", bean);

		StringWriter w = new StringWriter();

		getVelocityEngine().evaluate(vcontext, w, "log", template);

		return w.toString();
	}

	public static String writeTemplate(String template, Map bean) throws Exception
	{
		return writeTemplate(template, bean, new File("."));
	}

	public static String writeTemplate(String template, Map bean, File templateRoot) throws Exception
	{
		VelocityContext context = new VelocityContext(bean);

		StringWriter w = new StringWriter();

		getVelocityEngine(templateRoot).evaluate(context, w, "log", template);

		return w.toString();
	}

	public static String writeTemplate(String template, VariableContext bean) throws Exception
	{
		return writeTemplate(template, bean, new File("."));
	}

	public static String writeTemplate(String template, VariableContext bean, File templateRoot) throws Exception
	{
		if (!bean.hasVariableBeenDeclared("D"))
		{
			bean.declareVariable("D");
			bean.setStringValue("D", "$");
		}

		VelocityContext context = new VelocityContext(bean.getVelocityWrapper());

		StringWriter w = new StringWriter();

		getVelocityEngine(templateRoot).evaluate(context, w, "log", template);

		return w.toString();
	}
}