/*
 * Copyright (c) 2007-2009, Osmorc Development Team
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright notice, this list
 *       of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice, this
 *       list of conditions and the following disclaimer in the documentation and/or other
 *       materials provided with the distribution.
 *     * Neither the name of 'Osmorc Development Team' nor the names of its contributors may be
 *       used to endorse or promote products derived from this software without specific
 *       prior written permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.osmorc.manifest.lang.psi;

import com.intellij.codeInsight.daemon.EmptyResolveMessageProvider;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.module.ModuleUtil;
import com.intellij.openapi.util.Comparing;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.JavaPsiFacade;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiPackage;
import com.intellij.psi.PsiReferenceBase;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.util.ArrayUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * @author Robert F. Beeger (robert@beeger.net)
 */
public class PackageReference extends PsiReferenceBase<PsiElement> implements EmptyResolveMessageProvider {
    private final PackageReferenceSet myReferenceSet;
    private final int myIndex;

    public PackageReference(final PackageReferenceSet set, final TextRange range, final int index) {
        super(set.getElement(), range);
        myReferenceSet = set;
        myIndex = index;
        Module module = ModuleUtil.findModuleForPsiElement(set.getElement());
        if (module != null) {
            _moduleWithLibrariesScope = module.getModuleWithLibrariesScope();
        } else {
            _moduleWithLibrariesScope = GlobalSearchScope.allScope(set.getElement().getProject());
        }
    }

    @Nullable
    private PsiPackage getPsiPackage() {
        return myIndex == 0 ? JavaPsiFacade.getInstance(getElement().getProject()).findPackage("")
                : myReferenceSet.getReference(myIndex - 1).resolve();
    }

    public boolean isSoft() {
        return true;
    }

    @Nullable
    public PsiPackage resolve() {
        final PsiPackage parentPackage = getPsiPackage();
        if (parentPackage != null) {
            for (PsiPackage aPackage : parentPackage.getSubPackages(_moduleWithLibrariesScope)) {
                if (Comparing.equal(aPackage.getName(), getCanonicalText())) {
                    return aPackage;
                }
            }
        }
        return null;
    }

    @NotNull
    public Object[] getVariants() {
        final PsiPackage psiPackage = getPsiPackage();
        if (psiPackage == null) {
            return ArrayUtil.EMPTY_OBJECT_ARRAY;
        }
        final PsiPackage[] psiPackages = psiPackage.getSubPackages(_moduleWithLibrariesScope);
        final Object[] variants = new Object[psiPackages.length];
        System.arraycopy(psiPackages, 0, variants, 0, variants.length);
        return variants;
    }


    public String getUnresolvedMessagePattern() {
        return "Cannot resolve symbol";
    }

    private final GlobalSearchScope _moduleWithLibrariesScope;
}