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/**
 * Copyright (C) 2013-2014 [email protected]
 *
 * 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 net.codestory.http.templating;

import java.io.*;
import java.nio.file.*;
import java.util.*;

import net.codestory.http.io.*;
import net.codestory.http.markdown.*;
import net.codestory.http.templating.yaml.*;

public class ViewCompiler {
	private final Resources resources;
	private final TemplatingEngine templatingEngine;
	private final MarkdownCompiler markdownCompiler;

	public ViewCompiler(Resources resources, TemplatingEngine templatingEngine, MarkdownCompiler markdownCompiler) {
		this.resources = resources;
		this.templatingEngine = templatingEngine;
		this.markdownCompiler = markdownCompiler;
	}

	public String render(String uri, Map keyValues) {
		Path path = resources.findExistingPath(uri);
		if (path == null) {
			throw new IllegalArgumentException("Template not found " + uri);
		}

		try {
			YamlFrontMatter yamlFrontMatter = YamlFrontMatter.parse(resources.sourceFile(path));

			String content = yamlFrontMatter.getContent();
			Map variables = yamlFrontMatter.getVariables();
			Map allKeyValues = merge(variables, keyValues);

			String body = templatingEngine.compile(content, allKeyValues);
			if (MarkdownCompiler.supports(path)) {
				body = markdownCompiler.compile(body);
			}

			String layout = (String) variables.get("layout");
			if (layout == null) {
				return body;
			}

			String layoutContent = render("_layouts/" + layout, allKeyValues);
			return layoutContent.replace("[[body]]", body);
		} catch (IOException e) {
			throw new IllegalStateException("Unable to render template", e);
		}
	}

	private static Map merge(Map first, Map second) {
		Map merged = new HashMap<>();
		merged.putAll(first);
		merged.putAll(second);
		merged.put("body", "[[body]]");
		return merged;
	}
}