/*
 * Copyright (c) 2010, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.impl.widgets.basic;

import org.jowidgets.api.convert.IObjectStringConverter;
import org.jowidgets.api.convert.IStringObjectConverter;
import org.jowidgets.api.widgets.IComboBox;
import org.jowidgets.api.widgets.descriptor.setup.IComboBoxSetup;
import org.jowidgets.common.widgets.controller.IInputListener;
import org.jowidgets.spi.widgets.IComboBoxSpi;
import org.jowidgets.tools.validation.ValidationCache;
import org.jowidgets.tools.validation.ValidationCache.IValidationResultCreator;
import org.jowidgets.tools.widgets.invoker.ColorSettingsInvoker;
import org.jowidgets.tools.widgets.invoker.VisibiliySettingsInvoker;
import org.jowidgets.util.NullCompatibleEquivalence;
import org.jowidgets.validation.IValidationConditionListener;
import org.jowidgets.validation.IValidationResult;
import org.jowidgets.validation.IValidator;
import org.jowidgets.validation.ValidationResult;
import org.jowidgets.validation.tools.CompoundValidator;

public class ComboBoxImpl<VALUE_TYPE> extends ComboBoxSelectionImpl<VALUE_TYPE> implements IComboBox<VALUE_TYPE> {

    private final IStringObjectConverter<VALUE_TYPE> stringObjectConverter;
    private final IObjectStringConverter<VALUE_TYPE> objectStringConverter;
    private final ValidationCache validationCache;
    private final CompoundValidator<VALUE_TYPE> compoundValidator;

    private String lastUnmodifiedValue;

    public ComboBoxImpl(final IComboBoxSpi comboBoxWidgetSpi, final IComboBoxSetup<VALUE_TYPE> setup) {
        super(comboBoxWidgetSpi, setup);

        VisibiliySettingsInvoker.setVisibility(setup, this);
        ColorSettingsInvoker.setColors(setup, this);

        setElements(setup.getElements());

        if (setup.getValue() != null) {
            setValue(setup.getValue());
        }

        this.stringObjectConverter = setup.getStringObjectConverter();
        this.objectStringConverter = setup.getObjectStringConverter();

        this.compoundValidator = new CompoundValidator<VALUE_TYPE>();

        final IValidator<VALUE_TYPE> validator = setup.getValidator();
        if (validator != null) {
            compoundValidator.addValidator(validator);
        }

        final IValidator<String> stringValidator = stringObjectConverter.getStringValidator();
        this.validationCache = new ValidationCache(new IValidationResultCreator() {
            @Override
            public IValidationResult createValidationResult() {
                final IValidationResult result;
                if (stringValidator != null) {
                    result = stringValidator.validate(comboBoxWidgetSpi.getText());
                }
                else {
                    result = ValidationResult.ok();
                }
                //if the converter could not parse the input, do not make more validation
                if (!result.isValid()) {
                    return result;
                }
                else {
                    return result.withResult(compoundValidator.validate(getValue()));
                }
            }
        });

        getWidget().addInputListener(new IInputListener() {
            @Override
            public void inputChanged() {
                getWidget().setToolTipText(objectStringConverter.getDescription(getValue()));
                fireInputChanged();
                validationCache.setDirty();
            }
        });

    }

    @Override
    public IComboBoxSpi getWidget() {
        return (IComboBoxSpi) super.getWidget();
    }

    @Override
    public boolean hasModifications() {
        return !NullCompatibleEquivalence.equals(lastUnmodifiedValue, getWidget().getText());
    }

    @Override
    public void resetModificationState() {
        this.lastUnmodifiedValue = getWidget().getText();
    }

    @Override
    public void addValidator(final IValidator<VALUE_TYPE> validator) {
        compoundValidator.addValidator(validator);
    }

    @Override
    public IValidationResult validate() {
        return validationCache.validate();
    }

    @Override
    public void addValidationConditionListener(final IValidationConditionListener listener) {
        validationCache.addValidationConditionListener(listener);
    }

    @Override
    public void removeValidationConditionListener(final IValidationConditionListener listener) {
        validationCache.removeValidationConditionListener(listener);
    }

    @Override
    public void setValue(final VALUE_TYPE value) {
        if (value == null) {
            getWidget().setText("");
            getWidget().setSelectedIndex(-1);
        }
        else {
            final int indexOfContent = getElements().indexOf(value);
            if (indexOfContent != -1) {
                getWidget().setSelectedIndex(indexOfContent);
            }
            else {
                getWidget().setText(convertToString(value));
            }
        }
    }

    private String convertToString(final VALUE_TYPE value) {
        final String result = objectStringConverter.convertToString(value);
        if (result != null) {
            return result;
        }
        else {
            return "";
        }
    }

    @Override
    public VALUE_TYPE getValue() {
        if (stringObjectConverter != null) {
            return stringObjectConverter.convertToObject(getWidget().getText());
        }
        return null;
    }

    @Override
    public void setEditable(final boolean editable) {
        getWidget().setEditable(editable);
    }

}