/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.grails.cli.compiler;

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

import groovy.lang.Grab;
import org.codehaus.groovy.ast.AnnotationNode;
import org.codehaus.groovy.ast.expr.ConstantExpression;
import org.codehaus.groovy.ast.expr.Expression;

import org.springframework.core.annotation.Order;

import org.grails.cli.compiler.grape.DependencyResolutionContext;

/**
 * {@link import org.codehaus.groovy.transform.ASTTransformation} to resolve {@link Grab @Grab} artifact coordinates.
 *
 * @author Andy Wilkinson
 * @author Phillip Webb
 * @since 1.0.0
 */
@Order(ResolveDependencyCoordinatesTransformation.ORDER)
public class ResolveDependencyCoordinatesTransformation extends AnnotatedNodeASTTransformation {

    /**
     * The order of the transformation.
     */
    public static final int ORDER = DependencyManagementBomTransformation.ORDER + 300;

    private static final Set<String> GRAB_ANNOTATION_NAMES = Collections
        .unmodifiableSet(new HashSet<>(Arrays.asList(Grab.class.getName(), Grab.class.getSimpleName())));

    private final DependencyResolutionContext resolutionContext;

    public ResolveDependencyCoordinatesTransformation(DependencyResolutionContext resolutionContext) {
        super(GRAB_ANNOTATION_NAMES, false);
        this.resolutionContext = resolutionContext;
    }

    @Override
    protected void processAnnotationNodes(List<AnnotationNode> annotationNodes) {
        for (AnnotationNode annotationNode : annotationNodes) {
            transformGrabAnnotation(annotationNode);
        }
    }

    private void transformGrabAnnotation(AnnotationNode grabAnnotation) {
        grabAnnotation.setMember("initClass", new ConstantExpression(false));
        String value = getValue(grabAnnotation);
        if (value != null && !isConvenienceForm(value)) {
            applyGroupAndVersion(grabAnnotation, value);
        }
    }

    private String getValue(AnnotationNode annotation) {
        Expression expression = annotation.getMember("value");
        if (expression instanceof ConstantExpression) {
            Object value = ((ConstantExpression) expression).getValue();
            return (value instanceof String) ? (String) value : null;
        }
        return null;
    }

    private boolean isConvenienceForm(String value) {
        return value.contains(":") || value.contains("#");
    }

    private void applyGroupAndVersion(AnnotationNode annotation, String module) {
        if (module != null) {
            setMember(annotation, "module", module);
        }
        else {
            Expression expression = annotation.getMembers().get("module");
            module = (String) ((ConstantExpression) expression).getValue();
        }
        if (annotation.getMember("group") == null) {
            setMember(annotation, "group", this.resolutionContext.getArtifactCoordinatesResolver().getGroupId(module));
        }
        if (annotation.getMember("version") == null) {
            setMember(annotation, "version",
                    this.resolutionContext.getArtifactCoordinatesResolver().getVersion(module));
        }
    }

    private void setMember(AnnotationNode annotation, String name, String value) {
        ConstantExpression expression = new ConstantExpression(value);
        annotation.setMember(name, expression);
    }

}
