/*
 * This file is part of LibrePlan
 *
 * Copyright (C) 2009-2010 Fundación para o Fomento da Calidade Industrial e
 *                         Desenvolvemento Tecnolóxico de Galicia
 * Copyright (C) 2010-2011 Igalia, S.L.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.libreplan.web.materials;

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

import org.apache.commons.lang3.Validate;
import org.apache.commons.logging.LogFactory;
import org.libreplan.business.common.IntegrationEntity;
import org.libreplan.business.common.daos.IConfigurationDAO;
import org.libreplan.business.common.entities.EntityNameEnum;
import org.libreplan.business.common.exceptions.InstanceNotFoundException;
import org.libreplan.business.common.exceptions.ValidationException;
import org.libreplan.business.materials.daos.IUnitTypeDAO;
import org.libreplan.business.materials.entities.UnitType;
import org.libreplan.web.common.IntegrationEntityModel;
import org.libreplan.web.common.concurrentdetection.OnConcurrentModification;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * Model for the listing, creation and edition of UnitTypes
 * @author Javier Moran Rua <jmoran@igalia.com>
 */

@Service
@Scope(BeanDefinition.SCOPE_PROTOTYPE)
@OnConcurrentModification(goToPage = "/unittypes/unitTypes.zul")
public class UnitTypeModel extends IntegrationEntityModel implements
        IUnitTypeModel {

    private static final org.apache.commons.logging.Log LOG = LogFactory
    .getLog(UnitTypeModel.class);

    // This is the state of the model, just the current unitType being edited
    private UnitType unitTypeState;

    @Autowired
    private IUnitTypeDAO unitTypeDAO;

    @Autowired
    private IConfigurationDAO configurationDAO;

    @Override
    @Transactional(readOnly=true)
    public List<UnitType> getUnitTypes() {
        return unitTypeDAO.getAll();
    }

    @Override
    @Transactional(readOnly=true)
    public void initCreate() {
        Boolean generateCode = configurationDAO.getConfiguration()
                .getGenerateCodeForUnitTypes();
        this.unitTypeState = UnitType.create("", "");
        if (generateCode) {
            this.unitTypeState.setCodeAutogenerated(generateCode);
            setDefaultCode();
        }
    }

    @Override
    @Transactional(readOnly=true)
    public void initEdit(UnitType unitType) {
        Validate.notNull(unitType);
        this.unitTypeState = getFromDB(unitType);
        initOldCodes();
    }

    private UnitType getFromDB(UnitType unitType) {
        try {
            return unitTypeDAO.find(unitType.getId());
        } catch (InstanceNotFoundException e) {
            LOG.error("Could not load entity. Id: "
                    + unitType.getId(), e);
            throw new RuntimeException(e);
        }
    }

    @Override
    public UnitType getCurrentUnitType() {
        return this.unitTypeState;
    }

    @Override
    @Transactional
    public void confirmSave() throws ValidationException {
        unitTypeDAO.save(this.unitTypeState);
    }

    @Override
    @Transactional(readOnly=true)
    public boolean existsAnotherUnitTypeWithName(String name) {
        boolean result;

        try {
            UnitType foundUnitType =
                unitTypeDAO.findByNameCaseInsensitive(name);
            result = isTheSameEntityAsState(foundUnitType) ? false : true;
        } catch (InstanceNotFoundException e) {
            result = false;
        }

        return result;
    }

    @Override
    @Transactional(readOnly=true)
    public boolean existsAnotherUnitTypeWithCode(String code) {
        boolean result;

        try {
            UnitType foundUnitType =
                unitTypeDAO.findByCode(code);
            result = isTheSameEntityAsState(foundUnitType) ? false : true;
        } catch (InstanceNotFoundException e) {
            result = false;
        }

        return result;
    }

    private boolean isTheSameEntityAsState(UnitType foundUnitType) {
        if (getCurrentUnitType().isNewObject()) {
            return false;
        } else {
            return foundUnitType.getId().equals(getCurrentUnitType().getId());
        }
    }

    @Override
    @Transactional(readOnly=true)
    public boolean isUnitTypeUsedInAnyMaterial(UnitType unitType) {
        return unitTypeDAO.isUnitTypeUsedInAnyMaterial(unitType);
    }

    @Override
    @Transactional
    public void remove(UnitType unitType) {
        try {
            unitTypeDAO.remove(unitType.getId());
        } catch (InstanceNotFoundException e) {
            LOG.error("Trying to remove unit type with id " + unitType.getId() +
                    " but it is not found in the database",e);
            throw new RuntimeException();
        }
    }

    public EntityNameEnum getEntityName() {
        return EntityNameEnum.UNIT_TYPE;
    }

    public Set<IntegrationEntity> getChildren() {
        return new HashSet<IntegrationEntity>();
    }

    public IntegrationEntity getCurrentEntity() {
        return getCurrentUnitType();
    }
}