//
// MIT License
//
// Copyright (c) 2022 Alexander Söderberg & Contributors
//
// 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 cloud.commandframework.annotations.processing;

import cloud.commandframework.annotations.CommandMethod;
import java.util.Set;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.TypeElement;

@SupportedAnnotationTypes(CommandMethod.ANNOTATION_PATH)
public final class CommandMethodProcessor extends AbstractProcessor {

    @Override
    public boolean process(
            final Set<? extends TypeElement> annotations,
            final RoundEnvironment roundEnv
    ) {
        final Set<? extends Element> elements = roundEnv.getElementsAnnotatedWith(CommandMethod.class);
        if (elements.isEmpty()) {
            return false; // Nothing to process...
        }

        for (final Element element : elements) {
            if (element.getKind() != ElementKind.METHOD) {
                // @CommandMethod can also be used on classes, but there's
                // essentially nothing to process there...
                continue;
            }

            element.accept(new CommandMethodVisitor(this.processingEnv), null);
        }

        // https://errorprone.info/bugpattern/DoNotClaimAnnotations
        return false;
    }

    @Override
    public SourceVersion getSupportedSourceVersion() {
        return SourceVersion.latest();
    }
}
