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/*
 * Copyright 2012-2023 the original author or authors.
 *
 * 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
 *
 *      https://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 org.grails.cli.app;

import java.io.IOException;
import java.io.InputStream;
import java.util.jar.Manifest;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

/**
 * {@link SpringBootServletInitializer} for CLI packaged WAR files.
 *
 * @author Phillip Webb
 * @author Michael Yan
 * @since 2022.1.0
 */
public class GrailsApplicationWebApplicationInitializer extends SpringBootServletInitializer {

    /**
     * The entry containing the source class.
     */
    public static final String SOURCE_ENTRY = "Grails-Application-Source-Classes";

    private String[] sources;

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        try {
            this.sources = getSources(servletContext);
        }
        catch (IOException ex) {
            throw new IllegalStateException(ex);
        }
        super.onStartup(servletContext);
    }

    private String[] getSources(ServletContext servletContext) throws IOException {
        Manifest manifest = getManifest(servletContext);
        if (manifest == null) {
            throw new IllegalStateException("Unable to read manifest");
        }
        String sources = manifest.getMainAttributes().getValue(SOURCE_ENTRY);
        return sources.split(",");
    }

    private Manifest getManifest(ServletContext servletContext) throws IOException {
        InputStream stream = servletContext.getResourceAsStream("/META-INF/MANIFEST.MF");
        return (stream != null) ? new Manifest(stream) : null;
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        try {
            ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
            Class[] sourceClasses = new Class[this.sources.length];
            for (int i = 0; i < this.sources.length; i++) {
                sourceClasses[i] = Class.forName(this.sources[i], false, classLoader);
            }
            return builder.sources(sourceClasses).properties("spring.groovy.template.check-template-location=false");
        }
        catch (Exception ex) {
            throw new IllegalStateException(ex);
        }
    }

}