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/*
 * Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.faces.application.annotation;

import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import jakarta.faces.application.Application;
import jakarta.faces.context.FacesContext;
import jakarta.faces.validator.FacesValidator;

/**
 * 
 * ConfigAnnotationHandler for {@link FacesValidator} annotated classes.
 * 
 */
public class ValidatorConfigHandler implements ConfigAnnotationHandler {

    private static final Collection> HANDLES = List.of(FacesValidator.class);

    private Map validators;

    // ------------------------------------- Methods from ComponentConfigHandler

    /**
     * @see com.sun.faces.application.annotation.ConfigAnnotationHandler#getHandledAnnotations()
     */
    @Override
    public Collection> getHandledAnnotations() {

        return HANDLES;

    }

    /**
     * @see com.sun.faces.application.annotation.ConfigAnnotationHandler#collect(Class, java.lang.annotation.Annotation)
     */
    @Override
    public void collect(Class target, Annotation annotation) {

        if (validators == null) {
            validators = new HashMap<>();
        }
        FacesValidator validatorAnnotation = (FacesValidator) annotation;
        String value = ((FacesValidator) annotation).value();
        if (null == value || 0 == value.length()) {
            value = target.getSimpleName();
            value = Character.toLowerCase(value.charAt(0)) + value.substring(1);
        }
        ValidatorInfo info = new ValidatorInfo(value, validatorAnnotation.isDefault());
        validators.put(info, target.getName());

    }

    /**
     * @see com.sun.faces.application.annotation.ConfigAnnotationHandler#push(jakarta.faces.context.FacesContext)
     */
    @Override
    public void push(FacesContext ctx) {

        if (validators != null) {
            Application app = ctx.getApplication();
            for (Map.Entry entry : validators.entrySet()) {
                app.addValidator(entry.getKey().validatorId, entry.getValue());
                if (entry.getKey().isDefault) {
                    app.addDefaultValidatorId(entry.getKey().validatorId);
                }
            }
        }

    }

    // ---------------------------------------------------------- Nested Classes

    private static class ValidatorInfo {

        final String validatorId;
        final boolean isDefault;

        ValidatorInfo(String validatorId, boolean isDefault) {
            this.validatorId = validatorId;
            this.isDefault = isDefault;
        }

    }

}