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/*
 * Copyright 2008-2014 the original author or authors.
 *
 * Licensed 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
 *
 *     http://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.codehaus.groovy.transform;

import groovy.transform.SourceURI;
import org.codehaus.groovy.ast.ASTNode;
import org.codehaus.groovy.ast.AnnotatedNode;
import org.codehaus.groovy.ast.AnnotationNode;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.FieldNode;
import org.codehaus.groovy.ast.expr.DeclarationExpression;
import org.codehaus.groovy.ast.expr.EmptyExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.control.CompilePhase;
import org.codehaus.groovy.control.SourceUnit;

import java.io.File;
import java.net.URI;

import static org.codehaus.groovy.ast.tools.GeneralUtils.args;
import static org.codehaus.groovy.ast.tools.GeneralUtils.callX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.constX;

/**
 * Handles transformation for the @ScriptURI annotation.
 *
 * @author Paul King
 * @author Cedric Champeau
 * @author Vladimir Orany
 * @author Jim White
 */
@GroovyASTTransformation(phase = CompilePhase.SEMANTIC_ANALYSIS)
public class SourceURIASTTransformation extends AbstractASTTransformation {

    private static final Class MY_CLASS = SourceURI.class;
    private static final ClassNode MY_TYPE = ClassHelper.make(MY_CLASS);
    private static final String MY_TYPE_NAME = "@" + MY_TYPE.getNameWithoutPackage();
    private static final ClassNode URI_TYPE = ClassHelper.make(java.net.URI.class);

    public void visit(ASTNode[] nodes, SourceUnit source) {
        init(nodes, source);
        AnnotatedNode parent = (AnnotatedNode) nodes[1];
        AnnotationNode node = (AnnotationNode) nodes[0];
        if (!MY_TYPE.equals(node.getClassNode())) return;

        if (parent instanceof DeclarationExpression) {
            setScriptURIOnDeclaration((DeclarationExpression) parent, node);
        } else if (parent instanceof FieldNode) {
            setScriptURIOnField((FieldNode) parent, node);
        } else {
            addError("Expected to find the annotation " + MY_TYPE_NAME + " on an declaration statement.", parent);
        }
    }

    private void setScriptURIOnDeclaration(final DeclarationExpression de, final AnnotationNode node) {
        if (de.isMultipleAssignmentDeclaration()) {
            addError("Annotation " + MY_TYPE_NAME + " not supported with multiple assignment notation.", de);
            return;
        }

        if (!(de.getRightExpression() instanceof EmptyExpression)) {
            addError("Annotation " + MY_TYPE_NAME + " not supported with variable assignment.", de);
            return;
        }

        URI uri = getSourceURI(node);

        if (uri == null) {
            addError("Unable to get the URI for the source of this script!", de);
        } else {
            // Set the RHS to '= URI.create("string for this URI")'.
            // That may throw an IllegalArgumentExpression wrapping the URISyntaxException.
            de.setRightExpression(getExpression(uri));
        }
    }

    private void setScriptURIOnField(final FieldNode fieldNode, final AnnotationNode node) {
        if (fieldNode.hasInitialExpression()) {
            addError("Annotation " + MY_TYPE_NAME + " not supported with variable assignment.", fieldNode);
            return;
        }

        URI uri = getSourceURI(node);

        if (uri == null) {
            addError("Unable to get the URI for the source of this class!", fieldNode);
        } else {
            // Set the RHS to '= URI.create("string for this URI")'.
            // That may throw an IllegalArgumentExpression wrapping the URISyntaxException.
            fieldNode.setInitialValueExpression(getExpression(uri));
        }
    }

    private Expression getExpression(URI uri) {
        return callX(URI_TYPE, "create", args(constX(uri.toString())));
    }

    protected URI getSourceURI(AnnotationNode node) {
        URI uri = sourceUnit.getSource().getURI();

        if (uri != null) {
            if (!(uri.isAbsolute() || memberHasValue(node, "allowRelative", true))) {
                // FIXME:  What should we use as the base URI?
                // It is unlikely we get to this point with a relative URI since making a URL
                // from will make it absolute I think.  But lets handle the simple case of
                // using file paths and turning that into an absolute file URI.
                // So we will use the current working directory as the base.
                URI baseURI = new File(".").toURI();
                uri = uri.resolve(baseURI);
            }
        }

        return uri;
    }
}