package com.onaro.sanscreen.client.view.migration;

import java.text.DateFormat;
import java.text.MessageFormat;
import java.util.Date;
import java.util.List;
import java.util.ResourceBundle;

import org.eclipse.core.runtime.IAdaptable;

import com.onaro.client.DateFormats;
import com.onaro.sanscreen.client.SessionsHelper;
import com.onaro.sanscreen.client.error.CentralErrorHandler;
import com.onaro.sanscreen.client.view.GroupingDirector;
import com.onaro.sanscreen.client.view.selection.SelectedObject;
import com.onaro.sanscreen.client.view.selection.SelectedObjectUtils;
import com.onaro.sanscreen.client.view.tabular.GroupingSubTitleGenerator;
import com.onaro.sanscreen.server.migration.query.data.MigrationTask;
import com.onaro.sanscreen.server.migration.sessions.MigrationException;
import com.onaro.sanscreen.util.Constant;


/**
 * Generates sub title string to be added in the grouping director toolbar
 * The sub title shows the migration start time (the time that the QA micro view compares the violations with)
 */
public class MigrationTaskSubTitleGenerator implements GroupingSubTitleGenerator {
    private final DateFormat dateTimeFormat = DateFormats.getShortDateTimeFormat();
    private String messageFormat;


    public MigrationTaskSubTitleGenerator() {
        ResourceBundle resources = ResourceBundle.getBundle("com.onaro.sanscreen.client.view.migration.switchMigration"); //$NON-NLS-1$
        messageFormat = resources.getString("switch.migration.qa.sub.title"); //$NON-NLS-1$
    }

    /**
     * Generates sub title string to be added in the grouping director toolbar
     *
     * @param groupingDirector contains the selected task id
     * @return the migration start time (the time that the QA micro view compares the violations with) as a sub title text
     */
    public String generateSubTitle(GroupingDirector groupingDirector) {
        List<IAdaptable> selectedContexts = groupingDirector.getShowingAdaptables();
        SelectedObject selectedObject = SelectedObjectUtils.getFirstSelectedObject(selectedContexts);
        if (selectedObject != null) {
            
            try {
                long taskId = selectedObject.getObjId();
                MigrationTask task = SessionsHelper.getInstance().getMigrationSession().getMigrationTask(taskId);
                if (task != null) {
                    long migrationStartTime = task.getSnapshotTime();
                    if (migrationStartTime > 0 && migrationStartTime != Constant.END_DATE) {
                        String dateString = dateTimeFormat.format(new Date(migrationStartTime));

                        return MessageFormat.format(messageFormat, dateString);
                    }
                }
            } catch (MigrationException e) {
                CentralErrorHandler.handle("Failed to fetch migration start time of task '" + selectedObject.getName() + "'", e); //$NON-NLS-1$ //$NON-NLS-2$
            } catch (SessionsHelper.SessionsException e) {
                CentralErrorHandler.handle("Failed to fetch migration start time of task '" + selectedObject.getName() + "'", e); //$NON-NLS-1$ //$NON-NLS-2$
            }
        }

        return null;
    }
}