/*
 * 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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
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package org.graalvm.component.installer;

import org.graalvm.component.installer.remote.RemoteComponentParam;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.file.Path;
import java.util.Iterator;
import org.graalvm.component.installer.FileIterable.FileComponent;
import org.graalvm.component.installer.model.ComponentInfo;
import org.graalvm.component.installer.persist.MetadataLoader;

public class DownloadURLIterable extends AbstractIterable {

    public DownloadURLIterable(Feedback feedback, CommandInput input) {
        super(input, feedback);
    }

    @Override
    public Iterator<ComponentParam> iterator() {
        return new It();
    }

    @Override
    public ComponentIterable matchVersion(Version.Match m) {
        return this;
    }

    @Override
    public ComponentIterable allowIncompatible() {
        return this;
    }

    class It implements Iterator<ComponentParam> {

        @Override
        public boolean hasNext() {
            return input.hasParameter();
        }

        @Override
        public ComponentParam next() {
            String s = input.nextParameter();
            URL u;
            try {
                u = new URL(s);
            } catch (MalformedURLException ex) {
                throw feedback.failure("URL_InvalidDownloadURL", ex, s, ex.getLocalizedMessage());
            }
            boolean progress = input.optValue(Commands.OPTION_NO_DOWNLOAD_PROGRESS) == null;
            RemoteComponentParam p = new DownloadURLParam(u, s, s, feedback, progress);
            p.setVerifyJars(isVerifyJars());
            return p;
        }
    }

    static class DownloadURLParam extends RemoteComponentParam {

        DownloadURLParam(URL remoteURL, String dispName, String spec, Feedback feedback, boolean progress) {
            super(remoteURL, dispName, spec, feedback, progress);
        }

        @Override
        protected MetadataLoader metadataFromLocal(Path localFile) throws IOException {
            FileComponent fc = new FileComponent(localFile.toFile(), isVerifyJars(),
                            SystemUtils.fingerPrint(getDownloader().getReceivedDigest(), false), getFeedback());
            return fc.createFileLoader();
        }

        @Override
        public ComponentInfo completeMetadata() throws IOException {
            return createFileLoader().completeMetadata();
        }
    }

}