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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.tomakehurst.wiremock.extension.responsetemplating;

import java.io.IOException;

import com.github.jknack.handlebars.Context;
import com.github.jknack.handlebars.Handlebars;
import com.github.jknack.handlebars.Template;
import com.github.tomakehurst.wiremock.common.Exceptions;

public class HandlebarsOptimizedTemplate {

	private final Template template;

	private String startContent;
	private String templateContent;
	private String endContent;

	public HandlebarsOptimizedTemplate(final Handlebars handlebars, final String content) {
		startContent = content;
		templateContent = "";
		endContent = "";

		int firstDelimStartPosition = content.indexOf(Handlebars.DELIM_START);
		if (firstDelimStartPosition != -1) {
			int lastDelimEndPosition = content.lastIndexOf(Handlebars.DELIM_END);
			if (lastDelimEndPosition != -1) {
				startContent = content.substring(0, firstDelimStartPosition);
				templateContent = content.substring(firstDelimStartPosition,
						lastDelimEndPosition + Handlebars.DELIM_END.length());
				endContent = content.substring(lastDelimEndPosition + Handlebars.DELIM_END.length(), content.length());
			}
		}

		this.template = uncheckedCompileTemplate(handlebars, templateContent);
	}

	private static Template uncheckedCompileTemplate(Handlebars handlebars, String templateContent) {
		try {
			return handlebars.compileInline(templateContent);
		} catch (IOException e) {
			return Exceptions.throwUnchecked(e, Template.class);
		}
	}

	public String apply(Object contextData) {
		final RenderCache renderCache = new RenderCache();
		Context context = Context
				.newBuilder(contextData)
				.combine("renderCache", renderCache)
				.build();

		return  startContent +
				Exceptions.uncheck(() -> template.apply(context), String.class) +
				endContent;
	}
}