/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.felix.gogo.jline;

import java.io.IOException;
import java.util.Formatter;

import org.apache.felix.service.command.Converter;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.startlevel.BundleStartLevel;

public class Converters extends BaseConverters {
    private final BundleContext context;

    public Converters(BundleContext context) {
        this.context = context;
    }

    private CharSequence print(Bundle bundle) {
        // [ ID ] [STATE      ] [ SL ] symname
        int level = bundle.adapt(BundleStartLevel.class).getStartLevel();

        return String.format("%5d|%-11s|%5d|%s (%s)", bundle.getBundleId(),
                getState(bundle), level, bundle.getSymbolicName(), bundle.getVersion());
    }

    private CharSequence print(ServiceReference<?> ref) {
        StringBuilder sb = new StringBuilder();
        try (Formatter f = new Formatter(sb);)
        {
            String spid = "";
            Object pid = ref.getProperty("service.pid");
            if (pid != null) {
                spid = pid.toString();
            }

            f.format("%06d %3s %-40s %s", ref.getProperty("service.id"),
                    ref.getBundle().getBundleId(),
                    getShortNames((String[]) ref.getProperty("objectclass")), spid);
            return sb;
        }
    }

    private CharSequence getShortNames(String[] list) {
        StringBuilder sb = new StringBuilder();
        String del = "";
        for (String s : list) {
            sb.append(del).append(getShortName(s));
            del = " | ";
        }
        return sb;
    }

    private CharSequence getShortName(String name) {
        int n = name.lastIndexOf('.');
        if (n < 0) {
            n = 0;
        } else {
            n++;
        }
        return name.subSequence(n, name.length());
    }

    private String getState(Bundle bundle) {
        switch (bundle.getState()) {
            case Bundle.ACTIVE:
                return "Active";

            case Bundle.INSTALLED:
                return "Installed";

            case Bundle.RESOLVED:
                return "Resolved";

            case Bundle.STARTING:
                return "Starting";

            case Bundle.STOPPING:
                return "Stopping";

            case Bundle.UNINSTALLED:
                return "Uninstalled ";
        }
        return null;
    }

    public Bundle bundle(Bundle i) {
        return i;
    }

    public Object convert(Class<?> desiredType, final Object in) throws Exception {
        if (desiredType == Bundle.class) {
            return convertBundle(in);
        }

        if (desiredType == ServiceReference.class) {
            return convertServiceReference(in);
        }

        return super.convert(desiredType, in);
    }

    private Object convertServiceReference(Object in) throws InvalidSyntaxException {
        String s = in.toString();
        if (s.startsWith("(") && s.endsWith(")")) {
            ServiceReference<?> refs[] = context.getServiceReferences((String) null, String.format(
                    "(|(service.id=%s)(service.pid=%s))", in, in));
            if (refs != null && refs.length > 0) {
                return refs[0];
            }
        }

        ServiceReference<?> refs[] = context.getServiceReferences((String) null, String.format(
                "(|(service.id=%s)(service.pid=%s))", in, in));
        if (refs != null && refs.length > 0) {
            return refs[0];
        }
        return null;
    }

    private Object convertBundle(Object in) {
        String s = in.toString();
        try {
            long id = Long.parseLong(s);
            return context.getBundle(id);
        } catch (NumberFormatException nfe) {
            // Ignore
        }

        Bundle bundles[] = context.getBundles();
        for (Bundle b : bundles) {
            if (b.getLocation().equals(s)) {
                return b;
            }

            if (b.getSymbolicName().equals(s)) {
                return b;
            }
        }

        return null;
    }

    public CharSequence format(Object target, int level, Converter converter)
            throws IOException {
        if (level == LINE && target instanceof Bundle) {
            return print((Bundle) target);
        }
        if (level == LINE && target instanceof ServiceReference) {
            return print((ServiceReference<?>) target);
        }
        if (level == PART && target instanceof Bundle) {
            return ((Bundle) target).getSymbolicName();
        }
        if (level == PART && target instanceof ServiceReference) {
            return getShortNames((String[]) ((ServiceReference<?>) target).getProperty("objectclass"));
        }
        return super.format(target, level, converter);
    }

}