/*
 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javafx.application;

import com.sun.javafx.application.LauncherImpl;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javafx.stage.Stage;

/**
 * Mock JavaFX Application class, used by the FXLauncherTest sample
 * application and the FX mode of the Java launcher.
 */
public abstract class Application {
    private Parameters params = new Parameters();

    public static void launch(Class<? extends Application> appClass, String... args) {
        LauncherImpl.launchApplication(appClass, args);
    }

    public static void launch(String... args) {
        // Figure out the right class to call
        StackTraceElement[] cause = Thread.currentThread().getStackTrace();

        boolean foundThisMethod = false;
        String callingClassName = null;
        for (StackTraceElement se : cause) {
            // Skip entries until we get to the entry for this class
            String className = se.getClassName();
            String methodName = se.getMethodName();
            if (foundThisMethod) {
                callingClassName = className;
                break;
            } else if (Application.class.getName().equals(className)
                    && "launch".equals(methodName)) {

                foundThisMethod = true;
            }
        }

        if (callingClassName == null) {
            throw new RuntimeException("Error: unable to determine Application class");
        }

        try {
            Class theClass = Class.forName(callingClassName, false,
                               Thread.currentThread().getContextClassLoader());
            if (Application.class.isAssignableFrom(theClass)) {
                Class<? extends Application> appClass = theClass;
                LauncherImpl.launchApplication(appClass, args);
            } else {
                throw new RuntimeException("Error: " + theClass
                        + " is not a subclass of javafx.application.Application");
            }
        } catch (RuntimeException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    /**
     * Constructs a new {@code Application} instance.
     */
    public Application() {
    }

    public void init() throws Exception {
    }

    public abstract void start(Stage primaryStage) throws Exception;

    public void stop() throws Exception {
    }

    // Helper method called by LauncherImpl
    public void setParameters(String... args) {
        params.setArgs(args);
    }

    public final Parameters getParameters() {
        return params;
    }

    public static class Parameters {

        private List<String> raw = new ArrayList<>();

        void setArgs(String... args) {
            raw.clear();
            raw.addAll(Arrays.asList(args));
        }

        public Parameters() {
        }

        public List<String> getRaw() {
            return raw;
        }

        public List<String> getUnnamed() {
            return getRaw();
        }
    }

}