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

import java.awt.event.ActionEvent;
import java.util.Collections;
import java.util.List;
import java.util.ResourceBundle;

import com.onaro.sanscreen.client.SessionsHelper;
import com.onaro.sanscreen.client.error.CentralErrorHandler;
import com.onaro.sanscreen.client.view.ActionFactory;
import com.onaro.sanscreen.client.view.ViewDirector;
import com.onaro.sanscreen.client.view.actions.SingleSelectionAction;
import com.onaro.sanscreen.client.view.selection.ObjectSelectionModel;
import com.onaro.sanscreen.client.view.selection.SelectedObject;
import com.onaro.sanscreen.server.migration.query.data.MigrationTaskStateType;
import com.onaro.sanscreen.server.migration.sessions.MigrationException;
import com.onaro.sanscreen.server.migration.sessions.MigrationSession;
import com.onaro.util.IllegalInitException;
import com.onaro.util.jfc.RoleRestrictedAction;

/**
 * Change the state of some tasks.
 * A StateMachine in the state enum determines what are the next available states
 */
public class ChangeMigrationTaskStateAction extends SingleSelectionAction implements RoleRestrictedAction {
    private static final long serialVersionUID = 1L;

    private MigrationTaskStateType changeToState;
    private String stateName;

    public ChangeMigrationTaskStateAction(ActionFactory.ActionInitInfo actionInitInfo, ResourceBundle resources, ViewDirector targetView) throws IllegalInitException{
        super(actionInitInfo, resources, targetView);
        String name = getName();
        //the name of the action is used to set the state of the action
        stateName = name.substring(name.lastIndexOf('.') + 1);
        changeToState = MigrationTaskStateType.valueOf(stateName.toUpperCase());
    }

    @Override
    public void setEnableBySelection(ObjectSelectionModel selection){
        setEnabled(shouldBeEnabled(selection));
    }

    //action is enabled if the task can move to the selected state.
    private boolean shouldBeEnabled(ObjectSelectionModel selection){
        if(selection.size() == 1){
            SelectedObject selectedObject = getSelection();
            return MigrationUtil.getState(selectedObject).canChangeTo(changeToState);
        }

        return false;
    }

    public void actionPerformed(ActionEvent evt) {
        try {
            assert getSelection() != null : "this action should be enabled only when one row is selected"; //$NON-NLS-1$
            List<Long> list = Collections.singletonList(getSelection().getObjIdLong());
            MigrationSession session = SessionsHelper.getInstance().getMigrationSession();
            session.setMigrationTaskState(list, changeToState);
        } catch (SessionsHelper.SessionsException e) {
            CentralErrorHandler.handle("Failed to set state for switch migration tasks", e); //$NON-NLS-1$
        } catch (MigrationException e) {
            CentralErrorHandler.handle("Failed to set state for switch migration tasks", e); //$NON-NLS-1$
        }
    }
}