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/*
 * Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.tools.xjc.model;

import java.util.Collection;

import jakarta.activation.MimeType;
import javax.xml.namespace.QName;

import com.sun.codemodel.JClass;
import com.sun.codemodel.JExpression;
import com.sun.tools.xjc.model.nav.NClass;
import com.sun.tools.xjc.model.nav.NType;
import com.sun.tools.xjc.outline.Aspect;
import com.sun.tools.xjc.outline.Outline;
import org.glassfish.jaxb.core.v2.model.annotation.Locatable;
import org.glassfish.jaxb.core.v2.model.core.EnumLeafInfo;
import org.glassfish.jaxb.core.v2.model.core.ID;
import org.glassfish.jaxb.core.v2.model.core.NonElement;
import org.glassfish.jaxb.core.v2.model.core.Element;
import org.glassfish.jaxb.core.v2.runtime.Location;
import com.sun.xml.xsom.XSComponent;
import com.sun.xml.xsom.XmlString;

import org.xml.sax.Locator;

/**
 * Transducer that converts a string into an "enumeration class."
 * 
 * The structure of the generated class needs to precisely
 * follow the JAXB spec.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public final class CEnumLeafInfo implements EnumLeafInfo, NClass, CNonElement
{
    /**
     * The {@link Model} object to which this bean belongs.
     */
    public final Model model;

    /**
     * The parent into which the enum class should be generated.
     */
    public final CClassInfoParent parent;

    /**
     * Short name of the generated type-safe enum.
     */
    public final String shortName;

    private final QName typeName;

    private final XSComponent source;

    /**
     * Represents the underlying type of this enumeration
     * and its conversion.
     *
     * 
     * To parse XML into a constant, we use the base type
     * to do {@code lexical -> value}, then use a map to pick up the right one.
     *
     * 
     * Hence this also represents the type of the Java value.
     * For example, if this is an enumeration of xs:int,
     * then this field will be Java int.
     */
    public final CNonElement base;


    /**
     * List of enum members.
     */
    public final Collection members;

    private final CCustomizations customizations;

    /**
     * @see #getLocator()
     */
    private final Locator sourceLocator;

    public String javadoc;

    public CEnumLeafInfo(Model model,
                         QName typeName,
                         CClassInfoParent container,
                         String shortName,
                         CNonElement base,
                         Collection _members,
                         XSComponent source,
                         CCustomizations customizations,
                         Locator _sourceLocator) {
        this.model = model;
        this.parent = container;
        this.shortName = model.allocator.assignClassName(parent,shortName);
        this.base = base;
        this.members = _members;
        this.source = source;
        if(customizations==null)
            customizations = CCustomizations.EMPTY;
        this.customizations = customizations;
        this.sourceLocator = _sourceLocator;
        this.typeName = typeName;

        for( CEnumConstant mem : members )
            mem.setParent(this);

        model.add(this);

        // TODO: can we take advantage of the fact that enum can be XmlRootElement?
    }

    /**
     * Source line information that points to the place
     * where this type-safe enum is defined.
     * Used to report error messages.
     */
    @Override
    public Locator getLocator() {
        return sourceLocator;
    }

    @Override
    public QName getTypeName() {
        return typeName;
    }

    @Override
    public NType getType() {
        return this;
    }

    /**
     * @deprecated
     *      why are you calling the method whose return value is known?
     */
    @Deprecated
    @Override
    public boolean canBeReferencedByIDREF() {
        return false;
    }

    @Override
    public boolean isElement() {
        return false;
    }

    @Override
    public QName getElementName() {
        return null;
    }

    @Override
    public Element asElement() {
        return null;
    }

    @Override
    public NClass getClazz() {
        return this;
    }

    @Override
    public XSComponent getSchemaComponent() {
        return source;
    }

    @Override
    public JClass toType(Outline o, Aspect aspect) {
        return o.getEnum(this).clazz;
    }

    @Override
    public boolean isAbstract() {
        return false;
    }

    @Override
    public boolean isBoxedType() {
        return false;
    }

    @Override
    public String fullName() {
        return parent.fullName()+'.'+shortName;
    }

    public boolean isPrimitive() {
        return false;
    }

    @Override
    public boolean isSimpleType() {
        return true;
    }


    /**
     * The spec says the value field in the enum class will be generated
     * only under certain circumstances.
     *
     * @return
     *      true if the generated enum class should have the value field.
     */
    public boolean needsValueField() {
        for (CEnumConstant cec : members) {
            if(!cec.getName().equals(cec.getLexicalValue()))
                return true;
        }
        return false;
    }

    @Override
    public JExpression createConstant(Outline outline, XmlString literal) {
        // correctly identifying which constant it maps to is hard, so
        // here I'm cheating
        JClass type = toType(outline,Aspect.EXPOSED);
        for (CEnumConstant mem : members) {
            if(mem.getLexicalValue().equals(literal.value))
                return type.staticRef(mem.getName());
        }
        return null;
    }

    @Deprecated
    @Override
    public boolean isCollection() {
        return false;
    }

    @Deprecated
    @Override
    public CAdapter getAdapterUse() {
        return null;
    }

    @Deprecated
    @Override
    public CNonElement getInfo() {
        return this;
    }

    @Override
    public ID idUse() {
        return ID.NONE;
    }

    @Override
    public MimeType getExpectedMimeType() {
        return null;
    }

    @Override
    public Collection getConstants() {
        return members;
    }

    @Override
    public NonElement getBaseType() {
        return base;
    }

    @Override
    public CCustomizations getCustomizations() {
        return customizations;
    }

    @Override
    public Locatable getUpstream() {
        throw new UnsupportedOperationException();
    }

    @Override
    public Location getLocation() {
        throw new UnsupportedOperationException();
    }
}