/*
 * 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.brooklyn.core.typereg;

import java.util.Map;
import javax.annotation.Nullable;

import org.apache.brooklyn.api.catalog.CatalogItem.CatalogBundle;
import org.apache.brooklyn.api.mgmt.rebind.RebindSupport;
import org.apache.brooklyn.api.typereg.ManagedBundle;
import org.apache.brooklyn.api.typereg.OsgiBundleWithUrl;
import org.apache.brooklyn.config.ConfigKey;
import org.apache.brooklyn.core.mgmt.rebind.BasicManagedBundleRebindSupport;
import org.apache.brooklyn.core.objs.AbstractBrooklynObject;
import org.apache.brooklyn.core.objs.BrooklynObjectInternal;
import org.apache.brooklyn.util.http.auth.Credentials;
import org.apache.brooklyn.util.osgi.VersionedName;
import org.apache.brooklyn.util.text.BrooklynVersionSyntax;

import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;

public class BasicManagedBundle extends AbstractBrooklynObject implements ManagedBundle, BrooklynObjectInternal {

    private String symbolicName;
    private String version;
    private String checksum;
    private String url;
    private Credentials credentials;
    private transient boolean persistenceNeeded = false;

    /** Creates an empty one, with an ID, expecting other fields will be populated. */
    public BasicManagedBundle() {}

    public BasicManagedBundle(String name, String version, String url, @Nullable String checksum) {
        this(name, version, url, null, checksum);
    }

    public BasicManagedBundle(String name, String version, String url, Credentials credentials, @Nullable String checksum) {
        if (name == null && version == null) {
            Preconditions.checkNotNull(url, "Either a URL or both name and version are required");
        } else {
            Preconditions.checkNotNull(name, "Either a URL or both name and version are required");
            Preconditions.checkNotNull(version, "Either a URL or both name and version are required");
        }
        this.symbolicName = name;
        this.version = version;
        this.url = url;
        this.checksum = checksum;
        this.credentials = credentials;
    }
    
    @Override
    public boolean isNameResolved() {
        return symbolicName != null && version != null;
    }
    
    @Override
    public String getSymbolicName() {
        return symbolicName;
    }

    public void setSymbolicName(String symbolicName) {
        this.symbolicName = symbolicName;
    }
    
    @Override
    public String getSuppliedVersionString() {
        return version;
    }

    @Override
    public String getOsgiVersionString() {
        return version==null ? null : BrooklynVersionSyntax.toValidOsgiVersion(version);
    }

    public void setVersion(String version) {
        this.version = version;
    }
    
    @Override
    public VersionedName getVersionedName() {
        if (symbolicName==null) return null;
        return new VersionedName(symbolicName, version);
    }
    
    @Override
    public String getUrl() {
        return url;
    }

    @Override
    public Credentials getUrlCredential() {
        return credentials;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    /**
     * Gets the (internal) value to be used as the location in bundleContext.install(location). 
     * It thus allows us to tell if a cached OSGi bundle is the same as a bundle we are about to 
     * install (e.g. one we get from persisted state), or have retrieved from the initial catalog.
     * 
     * Care should be taken to set the checksum <em>before</em> using the OSGi unique url.
     */
    @Override
    public String getOsgiUniqueUrl() {
        return "brooklyn:" + (checksum != null ? checksum : getId());
    }
    
    @Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
                .add("symbolicName", symbolicName)
                .add("version", version)
                .add("url", url)
                .toString();
    }

    @Override
    public int hashCode() {
        // checksum deliberately omitted here to match with OsgiBundleWithUrl
        return Objects.hashCode(symbolicName, getOsgiVersionString(), url);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null) return false;
        if (getClass() != obj.getClass()) return false;
        OsgiBundleWithUrl other = (OsgiBundleWithUrl) obj;
        if (!Objects.equal(symbolicName, other.getSymbolicName())) return false;
        if (!Objects.equal(getOsgiVersionString(), other.getOsgiVersionString())) return false;
        if (!Objects.equal(url, other.getUrl())) return false;
        if (other instanceof ManagedBundle) {
            // checksum compared if available, but not required;
            // this makes equality with other OsgiBundleWithUrl items symmetric,
            // but for two MB's we look additionally at checksum
            if (!Objects.equal(checksum, ((ManagedBundle)other).getChecksum())) return false;
            
            // only equal if have the same ManagedBundle uid; important for persistence.changeListener().unmanage()
            if (!Objects.equal(getId(), ((ManagedBundle)other).getId())) return false;
        }
        return true;
    }

    // ---
    
    @Override
    public String getDisplayName() {
        return null;
    }

    @Override
    public <T> T getConfig(ConfigKey<T> key) {
        throw new UnsupportedOperationException();
    }

    @Override
    public RebindSupport<?> getRebindSupport() {
        return new BasicManagedBundleRebindSupport(this);
    }

    @Override
    public ConfigurationSupportInternal config() {
        throw new UnsupportedOperationException();
    }

    @Override
    public SubscriptionSupportInternal subscriptions() {
        throw new UnsupportedOperationException();
    }

    @Override
    public void setDisplayName(String newName) {
        throw new UnsupportedOperationException();
    }
    
    @Override
    public String getChecksum() {
        return checksum;
    }
    
    public void setChecksum(String md5Checksum) {
        this.checksum = md5Checksum;
    }

    @Override
    protected BrooklynObjectInternal configure(Map<?, ?> flags) {
        throw new UnsupportedOperationException();
    }

    public static ManagedBundle of(CatalogBundle bundle) {
        String checksum = (bundle instanceof ManagedBundle) ? ((ManagedBundle)bundle).getChecksum() : null;
        return new BasicManagedBundle(
                bundle.getSymbolicName(),
                bundle.getSuppliedVersionString(),
                bundle.getUrl(),
                bundle.getUrlCredential(),
                checksum);
    }

    public void setPersistenceNeeded(boolean val) {
        persistenceNeeded |= val;
    }
    public boolean getPersistenceNeeded() {
        return persistenceNeeded;
        
    }
    
}
