/*
 * 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.usergrid.chop.stack;


import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.UUID;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.commons.lang.builder.HashCodeBuilder;

import org.apache.usergrid.chop.api.Commit;
import org.apache.usergrid.chop.api.Module;
import org.apache.usergrid.chop.api.Runner;


/**
 * A Stack implementation used to decorate a standard Stack with runtime
 * information used by the coordinator to control and manage it.
 */
public class CoordinatedStack implements ICoordinatedStack {

    private static final Logger LOG = LoggerFactory.getLogger( CoordinatedStack.class );

    private final Stack delegate;
    private final List<CoordinatedCluster> clusters;
    private final Commit commit;
    private final Module module;
    private final User user;
    private final int runnerCount;
    private IpRuleSet ruleSet;
    private String dataCenter;

    private StackState state = StackState.INACTIVE;
    private SetupStackState setupState = SetupStackState.JarNotFound;
    private Set<Runner> runners;
    private Collection<Instance> runnerInstances = new LinkedList<Instance>();


    public CoordinatedStack( Stack delegate, User user, Commit commit, Module module, int runnerCount ) {
        this.delegate = delegate;
        this.clusters = new ArrayList<CoordinatedCluster>( delegate.getClusters().size() );
        this.user = user;
        this.commit = commit;
        this.module = module;
        this.runnerCount = runnerCount;
        this.dataCenter =  delegate.getDataCenter();
        this.ruleSet = delegate.getIpRuleSet();

        for ( Cluster cluster : delegate.getClusters() ) {
            this.clusters.add( new CoordinatedCluster( cluster ) );
        }
    }


    @Override
    public String getName() {
        return delegate.getName();
    }


    @Override
    public UUID getId() {
        return delegate.getId();
    }


    @Override
    public List<? extends ICoordinatedCluster> getClusters() {
        return clusters;
    }


    @Override
    public Commit getCommit() {
        return commit;
    }


    @Override
    public Module getModule() {
        return module;
    }


    @Override
    public User getUser() {
        return user;
    }


    @Override
    public int getRunnerCount() {
        return runnerCount;
    }


    @Override
    public StackState getState() {
        return state;
    }


    @Override
    public SetupStackState getSetupState() {
        return setupState;
    }


    @Override
    public Collection<Runner> getRunners() {
        return runners;
    }


    @Override
    public IpRuleSet getIpRuleSet() {
        return ruleSet;
    }


    @Override
    public Collection<Instance> getRunnerInstances() {
        return runnerInstances;
    }


    public CoordinatedStack setIpRuleSet( final IpRuleSet ruleSet ) {
        this.ruleSet = ruleSet;
        return this;
    }


    public CoordinatedStack addInboundRule( IpRule rule ) {
        ruleSet.getInboundRules().add( rule );
        return this;
    }


    public CoordinatedStack addOutboundRule( IpRule rule ) {
        ruleSet.getOutboundRules().add( rule );
        return this;
    }


    public void setSetupState( SetupStackSignal signal ) {
        if ( setupState.accepts( signal ) ) {
            LOG.info( setupState.getMessage( signal ) );
            setupState = setupState.next( signal );
            LOG.debug( "New state is: {}", setupState );
        }
        else {
            LOG.error( setupState.getMessage( signal ) );
        }
    }


    private void setSetupState( SetupStackState setupState ) {
        this.setupState = setupState;
    }


    public void addRunnerInstance( Instance instance ) {
        runnerInstances.add( instance );
    }


    @Override
    public String getDataCenter() {
        return dataCenter;
    }


    public CoordinatedStack setDataCenter( final String dataCenter ) {
        this.dataCenter = dataCenter;
        return this;
    }


    public static int calcHashCode( Stack stack, User user, Commit commit, Module module ) {
        return Math.abs( new HashCodeBuilder( 101, 167 )
                .append( stack.getId().toString() )
                .append( '#' )
                .append( user.getUsername() )
                .append( '#' )
                .append( commit.getId() )
                .append( '#' )
                .append( module.getId() )
                .toHashCode() );
    }


    @Override
    public int hashCode() {
        return calcHashCode( delegate, user, commit, module );
    }


    @Override
    public boolean equals( final Object obj ) {
        if( this == obj ) {
            return true;
        }
        if( obj == null ) {
            return false;
        }
        if ( ! ( obj instanceof CoordinatedStack ) ) {
            return false;
        }
        return obj.hashCode() == this.hashCode();
    }
}