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// Copyright (c) 2016 Timothy D. Jones
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package io.github.jonestimd.swing.validation;

import java.util.List;
import java.util.function.BiFunction;
import java.util.function.Function;

/**
 * Validate a property of a bean for uniqueness within a list of beans of the same type.
 * @param  the class of the beans
 */
public class UniqueValueValidator implements BeanPropertyValidator {
    private static final BiFunction NO_GROUPING = (o1, o2) -> true;

    private final String requiredMessage;
    private final String uniqueMessage;
    private final Function beanAdapter;
    private final BiFunction isSameGroup;

    /**
     * Construct a validator that uses all beans in the list for validating uniqueness.
     * @param beanAdapter the function for getting the property value from a bean
     * @param requiredMessage the error message to use when the property is not set
     * @param uniqueMessage the error message to use when the property value is not unique
     */
    public UniqueValueValidator(Function beanAdapter, String requiredMessage, String uniqueMessage) {
        this(beanAdapter, NO_GROUPING, requiredMessage, uniqueMessage);
    }

    /**
     * Construct a validator that uses all beans in the list for validating uniqueness.
     * @param beanAdapter the function for getting the property value from a bean
     * @param isSameGroup a function for testing if 2 beans are in the same group for uniqueness
     * @param requiredMessage the error message to use when the property is not set
     * @param uniqueMessage the error message to use when the property value is not unique
     */
    public UniqueValueValidator(Function beanAdapter, BiFunction isSameGroup,
                                String requiredMessage, String uniqueMessage) {
        this.beanAdapter = beanAdapter;
        this.isSameGroup = isSameGroup;
        this.requiredMessage = requiredMessage;
        this.uniqueMessage = uniqueMessage;
    }

    public String validate(int selectedIndex, String value, List items) {
        return validate(items.get(selectedIndex), value, items);
    }

    public String validate(T selectedItem, String value, Iterable items) {
        if (value == null || value.trim().length() == 0) {
            return requiredMessage;
        }
        if (isDuplicate(selectedItem, value, items)) {
            return uniqueMessage;
        }
        return null;
    }

    private boolean isDuplicate(T selectedItem, String value, Iterable items) {
        for (T item : items) {
            if (item != selectedItem && isSameGroup.apply(item, selectedItem) && value.equalsIgnoreCase(beanAdapter.apply(item))) {
                return true;
            }
        }
        return false;
    }
}