/*
 * @(#)ProcessActivityLogStatistics.java
 *
 * Copyright 2009 Instituto Superior Tecnico
 * Founding Authors: Luis Cruz, Nuno Ochoa, Paulo Abrantes
 * 
 *      https://fenix-ashes.ist.utl.pt/
 * 
 *   This file is part of the Expenditure Tracking Module.
 *
 *   The Expenditure Tracking Module is free software: you can
 *   redistribute it and/or modify it under the terms of the GNU Lesser General
 *   Public License as published by the Free Software Foundation, either version 
 *   3 of the License, or (at your option) any later version.
 *
 *   The Expenditure Tracking Module 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with the Expenditure Tracking Module. If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package pt.ist.expenditureTrackingSystem.domain.statistics;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import module.workflow.activities.ActivityInformation;
import module.workflow.activities.WorkflowActivity;
import module.workflow.domain.ActivityLog;
import module.workflow.domain.WorkflowLog;
import module.workflow.domain.WorkflowProcess;

import org.joda.time.DateTime;

import pt.ist.expenditureTrackingSystem.domain.acquisitions.PaymentProcess;
import pt.ist.expenditureTrackingSystem.domain.acquisitions.PaymentProcessYear;

/**
 * 
 * @author Luis Cruz
 * @author Paulo Abrantes
 * 
 */
public abstract class ProcessActivityLogStatistics {

    protected final List<LogEntry> logEntries = new ArrayList<LogEntry>();

    protected abstract void register(final PaymentProcessYear paymentProcessYear);

    protected void register(final PaymentProcess process) {
        final List<WorkflowLog> operationLogs = new ArrayList<WorkflowLog>(process.getExecutionLogs(ActivityLog.class));
        Collections.sort(operationLogs, WorkflowLog.COMPARATOR_BY_WHEN);

        final Set<LogEntry> logEntrySet = new HashSet<LogEntry>();

        for (int i = 1; i < operationLogs.size(); i++) {
            final WorkflowLog operationLog = operationLogs.get(i);
            final WorkflowLog previousLog = operationLogs.get(i - 1);

            final long duration = calculateDuration(operationLog, previousLog);

            final WorkflowActivity abstractActivity = getActivity(process, (ActivityLog) operationLog);
            final LogEntry logEntry = getLogEntry(abstractActivity);
            if (!logEntrySet.contains(logEntry)) {
                logEntrySet.add(logEntry);
                logEntry.countProcess();
            }
            logEntry.register(duration);
        }
    }

    protected WorkflowActivity<WorkflowProcess, ActivityInformation<WorkflowProcess>> getActivity(PaymentProcess process,
            ActivityLog operationLog) {
        return process.getActivity(operationLog.getOperation());
    }

    protected long calculateDuration(final WorkflowLog operationLog, final WorkflowLog previousLog) {
        final DateTime dateTime = operationLog.getWhenOperationWasRan();
        final DateTime previousDateTime = previousLog.getWhenOperationWasRan();
        return dateTime.getMillis() - previousDateTime.getMillis();
    }

    protected LogEntry getLogEntry(final WorkflowActivity abstractActivity) {
        for (final LogEntry logEntry : logEntries) {
            if (logEntry.getAbstractActivity() == abstractActivity) {
                return logEntry;
            }
        }
        final LogEntry logEntry = new LogEntry(abstractActivity);
        logEntries.add(logEntry);
        return logEntry;
    }

}