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/*
 * 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.uima.ducc.database;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.UUID;

import org.apache.uima.ducc.common.db.DbHelper;
import org.apache.uima.ducc.common.persistence.IDbProperty;
import org.apache.uima.ducc.common.persistence.services.IStateServices;
import org.apache.uima.ducc.common.persistence.services.StateServicesDirectory;
import org.apache.uima.ducc.common.persistence.services.StateServicesSet;
import org.apache.uima.ducc.common.utils.DuccLogger;
import org.apache.uima.ducc.common.utils.DuccProperties;
import org.apache.uima.ducc.common.utils.id.DuccId;

import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Row;
import com.datastax.driver.core.SimpleStatement;
import com.datastax.driver.core.exceptions.NoHostAvailableException;

public class StateServicesDb
    implements IStateServices
{
	private DuccLogger logger = null;
	private DuccId jobid = null;
    private DbManager dbManager;
    private AccessMode accessMode = AccessMode.RW;
    private static final String SVC_TABLE = "ducc." + SvcRegProps.TABLE_NAME.pname();
    private static final String META_TABLE = "ducc." + SvcMetaProps.TABLE_NAME.pname();
    // (My) db conventions are that everything must follow the conventions of IDbProperty.  SM
    // uses properties directly.  Maybe we'll change this some time.  For now, we need to efficiently
    // convert a Properties object into a Map keyed on IDbProperty; hence these two convenient maps
    // from string to property.
    Map s2regProps = new HashMap();
    Map s2metaProps = new HashMap();
    public StateServicesDb()
    {
        for ( SvcRegProps p : SvcRegProps.values() ) {
            s2regProps.put(p.pname(), p);
        }
        for ( SvcMetaProps p : SvcMetaProps.values() ) {
            s2metaProps.put(p.pname(), p);
        }
    }

    private boolean init(String[] dburls, DbManager dbm)
        throws Exception
    {
    	String methodName = "init";
        // log4j issue - the caller must pass in a logger configured correctly for the component
        //               to which it belongs or it won't get sent to the right appender.

        boolean ret = true;
        if ( dbm != null ) {
            this.dbManager = dbm;
        } else {
            while ( true ) {
                try {
                    dbManager = new DbManager(dburls, logger);
                    dbManager.init();
                    break;
                } catch ( NoHostAvailableException e ) {
                    logger.error(methodName, null, "Cannot contact the database host, Retryng connection in 5 seconds.");
                    Thread.sleep(5000);
                } catch ( Exception e ) {
                    logger.error(methodName, null, "Cannot open the database.", e);
                    ret = false;
                    break;
                }
            }
        }

        return ret;
    }

    public boolean init(DuccLogger logger)
    	throws Exception
    {
    	this.logger = logger;
        String[] dbUrls = DbHelper.getHostList();
        return init(dbUrls, null);
    }

    // package only, for the loader
    boolean init(DuccLogger logger, DbManager dbManager)
    	throws Exception
    {
    	this.logger = logger;
    	String[] dbUrls = DbHelper.getHostList();
        return init(dbUrls, dbManager);
    }

    private Map getProperties(String tableid, IDbProperty[] props, boolean active)
    	throws Exception
    {
    	String methodName = "getProperties";
        Map ret = new HashMap();
        
        SimpleStatement s = new SimpleStatement( "SELECT * FROM " + tableid + " WHERE is_archived=" + active);
        s.setFetchSize(100);
        DbHandle h = dbManager.open();
        ResultSet rs = h.execute(s);
        for ( Row r : rs ) {
            Map rowvals = DbUtil.getProperties(props, r);
            DuccProperties dp = new DuccProperties();
            dp.ignorePlaceholders();    // Place-holders already resolved -- leave ${DUCC_SERVICE_INSTANCE} as-is
            for (String k : rowvals.keySet()) {
                dp.put(k, rowvals.get(k));
            }

            // if these don't work the DB is busted.  This set of properties is now useless.
            try {
                String id = r.getString(IStateServices.SvcRegProps.numeric_id.pname());
                if ( id == null ) {
                    throw new IllegalStateException("Missing numeric id for service properties.");
                }
                ret.put(Long.parseLong(id), dp);
            } catch ( Exception e ) {
                logger.error(methodName, null, "Fatal error recovering properties.  Discarding row.");
            }

        }
    	return ret;
    }

    StateServicesDirectory fetchServices(boolean isArchived)      // pkg protection, for db utilities to use
        throws Exception
    {
        String methodName = "getStateServicesDirectory";
        long now = System.currentTimeMillis();

        StateServicesDirectory ret = new StateServicesDirectory();

        if ( dbManager== null ) {
            logger.error(methodName, null, "Service database is not initialized.");
            return ret;    // avoid NPE in caller
        }

        try {
            Map svcset  = getProperties(SVC_TABLE, IStateServices.SvcRegProps.values(), isArchived);
            Map metaset = getProperties(META_TABLE, IStateServices.SvcMetaProps.values(), isArchived);
            
            for ( Long k : svcset.keySet() ) {
                logger.trace(methodName, null, "Handling key", k);
                DuccProperties sp = svcset.get(k);
                DuccProperties mp = metaset.get(k);
                StateServicesSet sss = new StateServicesSet();
                sss.put(svc, sp);
                sss.put(meta, mp);
                
                ret.put(k, sss);            
            }
        } catch ( Exception e ) {
            logger.error(methodName, null, "Cannot read service directory:", e);
        }

        logger.trace(methodName, null, "Time to read service registry", System.currentTimeMillis() - now);
        return ret;
    }

    /**
     * This is adapted from the file-based version and as such, perhaps should be named better.
     *
     * This reads the entire (live, non-history) service registration into an object called
     * StateServicesDirectory.  This in turn contains a map of StateServicesSet objects.  Each
     * StateServiceSet contains two properties files, one for the submitted properties, and one
     * for the service meta properties (SM state).
     */
    public StateServicesDirectory getStateServicesDirectory()
    	throws Exception
    {
        return fetchServices(false);          // get the non-archived stsuff
    }

    Map mkMap(DuccId did, String table, Map converter, Properties props)
    {
    	String methodName = "mkMap";

        // hmmm  - some old registrations didn't seem to get converted - we'll do it now
        String kk = "process_failures_limit";
        if ( props.containsKey(kk) ) {
            Object v = props.remove(kk);
            kk = SvcRegProps.instance_failures_limit.columnName();
            props.put(kk, v);
        }
        kk = "process_DD";
        if ( props.containsKey(kk) ) {
            Object v = props.remove(kk);
            kk = SvcRegProps.process_dd.columnName();
            props.put(kk, v);
        }
        kk = "process_classpath";
        if ( props.containsKey(kk) ) {
            Object v = props.remove(kk);
            kk = SvcRegProps.classpath.columnName();
            props.put(kk, v);
        }
        kk = "jvm_args";
        if ( props.containsKey(kk) ) {
            Object v = props.remove(kk);
            kk = SvcRegProps.process_jvm_args.columnName();
            props.put(kk, v);
        }
        
        Map ret = new HashMap();
        for ( Object k : props.keySet() ) {
            IDbProperty p = converter.get((String) k);
            if (p == null ) {
                logger.error(methodName, did, "Unrecognized property", k, "for table", table);
                continue;
            }
            String val = (String) props.get(k);
            val = val.replace("'", "''");          // must escape single quotes - this is how CQL and SQL do it
            ret.put(p, val);
        }
        return ret;
    }

    /**
     * Save the src and meta propeties into the non-history part of the DB. 
     *
     * @param serviceID The SM-assigned duccid for the service registration.
     * @param svc_props The "user-submitted" properties set defining the service.
     * @param meta-props The SM-generated properties contain service state
     * @param safe This is for the loader.  If 'true', then don't do anything if
     *             there is already something in the DB for the service.  If 'false
     *             just blindly put it into the DB.
     * @NOTE The OrientDb SQL has a create-or-modify primitive.  Is there something
     *       equivalent in the Java interface?  If so, we should modify this to use it
     *       and can then eliminate the 'safe' flag.
     */
    public boolean storeProperties (DuccId serviceId, Properties svc_props, Properties meta_props)
    {
        String methodName = "storePropertiesInternal";
        
        // allow write iff access mode == RW
        switch(accessMode) {
        case RW:
        	break;
        default:
        	logger.debug(methodName, jobid, accessMode.name());
        	return false;
        }
        
        DbHandle h = null;

        boolean ret = false;
        long now = System.currentTimeMillis();
        try {
            h = dbManager.open();
            long numeric = serviceId.getFriendly();
            UUID uuid =    serviceId.getUUID();
            // the utils want Maps of IDbProperty which give hints how to form the cql; properties don't
            Map svc_map = mkMap(serviceId, SVC_TABLE, s2regProps, svc_props);
            Map meta_map = mkMap(serviceId, META_TABLE, s2metaProps, meta_props);
            svc_map.put(SvcRegProps.numeric_id, numeric);
            svc_map.put(SvcRegProps.uuid, uuid.toString());

            svc_map.put(SvcRegProps.is_archived, "false");        // never archived when first put into db
            meta_map.put(SvcMetaProps.is_archived, "false");
            
            // in Cassandra, we use "batch" mode to get multiple inserts managed as a single transaction
            String cql = "";
            StringBuffer buf = new StringBuffer("BEGIN BATCH ");
            cql = DbUtil.mkInsert(SVC_TABLE, svc_map);
            buf.append(cql);
            buf.append("; ");
            cql = DbUtil.mkInsert(META_TABLE, meta_map);
            buf.append(cql);
            buf.append("; ");
            buf.append("APPLY BATCH");
            h.execute(buf.toString());
            
        } catch ( Exception e ) {
            logger.error(methodName, null, "Error storing props for new registration:", e);
            ret = false;
        } finally {
            logger.trace(methodName, serviceId, "Time to create (2) proeprties files:", System.currentTimeMillis() - now);
        }
        return ret;
    }
    

    /**
     * The registration is removed, move it to the history part of the DB.
     */
    public boolean  moveToHistory(DuccId serviceId, Properties job_props, Properties meta_props)
    {
       // All we need to do is re-sync the final properties, and be sure to set DUCC_HISTORY to false
        String methodName = "moveToHistory";
        
        // allow write iff access mode == RW
        switch(accessMode) {
        case RW:
        	break;
        default:
        	logger.debug(methodName, jobid, accessMode.name());
        	return false;
        }
        
        DbHandle h = null;
        try {
            
            h = dbManager.open();        // get new connection from the pool

            job_props.put(SvcRegProps.is_archived.pname(), "true");
            meta_props.put(SvcRegProps.is_archived.pname(), "true");
            StringBuffer buf = new StringBuffer("BEGIN BATCH ");
            buf.append("UPDATE ");
            buf.append(SVC_TABLE);
            buf.append(" SET ");
            buf.append(SvcRegProps.is_archived.columnName());
            buf.append("=true WHERE numeric_id='");
            buf.append(Long.toString(serviceId.getFriendly()));
            buf.append("';");

            buf.append("UPDATE ");
            buf.append(META_TABLE);
            buf.append(" SET ");
            buf.append(SvcMetaProps.is_archived.columnName());
            buf.append("=true WHERE numeric_id='");
            buf.append(Long.toString(serviceId.getFriendly()));
            buf.append("';");

            buf.append("APPLY BATCH");
            h.execute(buf.toString());

            return true;
        }  catch ( Exception e ) {
            logger.error(methodName, serviceId, "Error moving registration to history:", e);
            return false;
        } 
    }
    
    /**
     * Helper method to Update the indicated properties file, in the non-history part of the db.
     * This is most often called by SM to update the service meta after state changes.
     *
     * @param keyField - the IDbProperty identifying the row key
     * @parem table    - the String name of the table
     * @param key      - the String value of the key identifying the row
     * @param converter - either s2regProps or s2metaProps, identifying the String - to - IDbProperty converter
     * @param props The properties file to save.  Usually it's just the meta but if
     *              the service is being modified, it could also be the registration being updated.
     */
    private boolean updateProperties(DuccId serviceId, String table, String key, Map converter, Properties props)
    {
        String methodName = "updatePropeties";
        DbHandle h = null;
        try {            
            h = dbManager.open();
            Map map = mkMap(serviceId, table, converter, props);
            List tmp = new ArrayList();
            for ( IDbProperty k : map.keySet() ) {
                if ( logger.isTrace() ) {
                    logger.trace(methodName, null, "Updating", k.columnName(), "with", map.get(k));
                }
                if ( k.isPrimaryKey() ) continue;    // we do not get to update this
                tmp.add(k);
                tmp.add(map.get(k));
            }
            
            h.updateProperties(table, key, tmp.toArray(new Object[tmp.size()]));
            return true;
        } catch ( Exception e ) {
            logger.error(methodName, null, "Unable to update properties for service", key, "table", table, ":", e);
            return false;            
        } 
    }
    
    /**
     * Update the service registration.
     */
    public boolean updateJobProperties(DuccId serviceId, Properties props) 
    {
        String methodName = "updateJobProperties";
    	
        // allow write iff access mode == RW
        switch(accessMode) {
        case RW:
        	break;
        default:
        	logger.debug(methodName, jobid, accessMode.name());
        	return false;
        }
    	
    	return updateProperties(serviceId, SVC_TABLE, "numeric_id='" + Long.toString(serviceId.getFriendly()) + "'", s2regProps, props);
    }

    /**
     * Update the service meta data.
     */
    public boolean updateMetaProperties(DuccId serviceId, Properties props) 
    {
String methodName = "updateMetaProperties";
    	
        // allow write iff access mode == RW
        switch(accessMode) {
        case RW:
        	break;
        default:
        	logger.debug(methodName, jobid, accessMode.name());
        	return false;
        }
        
        return updateProperties(serviceId, META_TABLE, "numeric_id='" + Long.toString(serviceId.getFriendly()) + "'", s2metaProps, props);
    }

    public void shutdown()
    {
        dbManager.shutdown();
    }

    static List mkSchema()
    	throws Exception
    {
        List ret = new ArrayList();


        StringBuffer buf = new StringBuffer("CREATE TABLE IF NOT EXISTS " + SVC_TABLE + " (");
        buf.append(DbUtil.mkSchema(SvcRegProps.values()));
        buf.append(")");    
        ret.add(new SimpleStatement(buf.toString()));
        ret.add(new SimpleStatement("CREATE INDEX IF NOT EXISTS ON " + SVC_TABLE + "(" + SvcRegProps.is_archived.columnName() + ")"));

        buf = new StringBuffer("CREATE TABLE IF NOT EXISTS " + META_TABLE + " (");
        buf.append(DbUtil.mkSchema(SvcMetaProps.values()));
        buf.append(")");    
        ret.add(new SimpleStatement(buf.toString()));
        ret.add(new SimpleStatement("CREATE INDEX IF NOT EXISTS ON " + META_TABLE + "(" + SvcMetaProps.is_archived.columnName() +")"));

        return ret;
    }

	@Override
	public void setAccessMode(AccessMode accessMode) {
		String methodName = "setAccessMode";
		String prev = this.accessMode.name();
		String curr = accessMode.name();
		if(prev.equals(curr)) {
			// no change
		}
		else {
			this.accessMode = accessMode;
			logger.warn(methodName, jobid, prev, "=>", curr);
		}
	}

	@Override
	public AccessMode getAccessMode() {
		return accessMode;
	}

}
    

    

    

            

    

            



    
    






    
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