package gradlecpp

import org.apache.velocity.Template
import org.apache.velocity.VelocityContext
import org.apache.velocity.app.Velocity
import org.joda.time.format.DateTimeFormat
import versioning.ReapiVersionInfo

class VelocityUtils {

	static {
		Properties p = new Properties();

		p.setProperty("resource.loader", "class");
		p.setProperty("class.resource.loader.class", "org.apache.velocity.runtime.resource.loader.FileResourceLoader");
		p.setProperty("class.resource.loader.path", "");

		p.setProperty("input.encoding", "UTF-8");
		p.setProperty("output.encoding", "UTF-8");

		Velocity.init(p);
	}
	static String renderTemplate(File tplFile, ReapiVersionInfo ctx) {
		Template tpl = Velocity.getTemplate(tplFile.absolutePath)
		if (!tpl) {
			throw new RuntimeException("Failed to load velocity template ${tplFile.absolutePath}: not found")
		}

		def templateCtx = [
			verInfo: ctx
		]

		def velocityContext = new VelocityContext(templateCtx)

		if (ctx.specialVersion.length() > 0) {
			velocityContext.put("appFlags", 0x0L)
			velocityContext.put("formatSpecialVersion", "-" + ctx.specialVersion)
		} else {
			
			velocityContext.put("appFlags", "VS_FF_SPECIALBUILD")
			velocityContext.put("formatSpecialVersion", "")
		}

		velocityContext.put("current_version", ctx.asVersion())

		velocityContext.put("_DateTimeFormat", DateTimeFormat)

		def sw = new StringWriter()
		tpl.merge(velocityContext, sw)

		return sw.toString()
	}
}